/THÝAAR/


Thýra (door, threshold, beginning) + RAAR (Reusable Architectural Assemblies Research)

THÝAAR is a not-for-profit design research initiative focusing on developing reusable architectural assemblies. Four benchmarks define the work: 1. Faster to build than conventional light frame systems. 2. As easy to disassemble as to assemble. 3. As economical as traditional light-frame systems, with better structural and functional performance. 4. Adaptable to a wide range of designs and layouts. What follows are periodic updates recording this ongoing endeavor. THÝAAR is directed by Pouya Khadem and it’s based in Houston, TX.
MARCH 2026  |  RESEARCH  |  NOTE A

Introduction to Essential Seed

Essential Seed is a concept to offer a scalable strategy to allow buildings to be a dynamic asset throughout time. It is a functional and immediate structure of the project designed for ease of assembly, disassembly, and expandability. It performs as a core that allows for immediate minimal use, yet, ease of expansion and adaptation over time. Its goal is to accelerate occupancy and time-to-market, enabling the project to generate economic value more immediately. The structure then expands and evolves over time as resources allow. The ability to seamlessly expand while building is operating requires offsite fabrications with predictable and precise results. That is why Cross-Laminated Timber (CLT) is the right choice for this approach; Essential Seeds utilizes off-site prefabrication and CNC manufacturing abilities intrinsic to CLT to ensure that core components are sufficiently independent of site-specific constraints. This allows for exact digital replication and seamless integration of new components over time.


BIBLIOGRAPHY

  1. International Organization for Standardization. Sustainability in Buildings and Civil Engineering Works — Design for Disassembly and Adaptability — Principles, Requirements and Guidance. ISO 20887:2020. Geneva: ISO, 2020. https://www.iso.org/standard/69370.html
  2. Think Wood. "Projects That Pencil Out: Speed Up Construction with Mass Timber." Think Wood (blog), 2022. https://www.thinkwood.com/blog/projects-that-pencil-out-speed-up-construction-with-mass-timber.

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Fig. A1. The graph depicts a common 4-over-1 mixed-use typology planned using the Essential Seed strategy with CLT. This approach enables phased development, allowing projects to reach market faster while maintaining flexibility and scalability in response to change in demand. The result is a more efficient, adaptable building structure that can evolve over time.


Fig. A2. The graph illustrates a common 4-over-1 mixed-use typology planned using traditional construction methods. This approach requires the full development potential to be built upfront. Because future modifications are too costly and difficult, the approach offers limited adaptability to changing market conditions over time.

MARCH 2026  |  RESEARCH  |  NOTE B

Why CLT Matters

CLT is a versatile construction material that offers an array of advantages over conventional materials. CLT panels strength-to-weight ratio exceeds that of steel by approximately 20% and surpasses unreinforced concrete in compression by four to five times. CLT provides effective thermal insulation, outperforming concrete by a factor of ten-to-fifteen and steel by a factor of four hundred. From an environmental perspective, the embodied carbon of a typical steel-and-concrete structure averages about 225 kilograms of CO₂ per square meter, whereas a comparable CLT structure emits much less. It sequesters roughly 900 kilograms of CO₂ per cubic meter, positioning CLT as a suitable material for carbon-neutral constructions. 

Although CLT panels are standardized into a limited range of slab thicknesses and panel sizes, they are adaptable for use as walls, floors, and roofs. Unlike steel members, they transfer loads multidirectionally within a plane rather than linearly, as in framing systems. Because of their planar, multidirectional load-transfer capacity and standardized slab format, recycled CLT panels can be repurposed as load bearing walls, beams, columns, or slabs in future projects. This adaptability expands reuse possibilities, can extend material lifespan beyond a single building, and reduces the cost of production, reinforcing both the environmental and economic benefits of CLT construction.

The adoption of CLT is foundational to the viability of the Essential Seed. CLT provides a significant speed-to-market advantage, with assembly rates as fast as nine days per floor. The reduced construction timeline allows projects to begin generating revenue sooner while lowering financing costs through a shorter construction loan period and reduced interest accrual. The material's weight—approximately 60% lighter than concrete—reduces foundational requirements and site-preparation costs while providing the structural agility necessary for phased expansion. By decreasing on-site labor demands by up to 50%, CLT can help Essential Seed to shift the construction paradigm from an on-site labor-driven craft to a precision-engineered assembly process, making the initial capital expenditure for developers more predictable.


BIBLIOGRAPHY

  1. Chamber of Progress. "Mass Timber: A Promising New Housing Technology." Chamber of Progress, 2026. https://progresschamber.org/research/mass-timber-promising-housing-tech/.
  2. C. M. Lee, Christopher. “Essential Planes.” In Blank : Speculations on CLT edited by Jennifer Bonner and Hanif Kara, 65-75. First edition. Novato, CA: Applied Research and Design Publishing, an imprint of ORO Editions, 2021.
  3. Make It Wood (Planet Ark). "Wood Is a Natural Insulator." Make It Wood. Accessed July 6, 2026. https://makeitwood.org/benefits/insulator.
  4. Stora Enso. CLT — Wood: The World's Oldest and Yet Most Modern Building Material. Product brochure. Stora Enso Wood Products GmbH. Accessed July 6, 2026. https://www.lilleheden.dk/Files/Files/Produkter/CLT/Image-brochure-CLT_EN.pdf.
  5. Hemmati, Mahboobeh, Tahar Messadi, Hongmei Gu, Jacob Seddelmeyer, and Moein Hemmati. "Comparison of Embodied Carbon Footprint of a Mass Timber Building Structure with a Steel Equivalent." Buildings 14, no. 5 (2024): 1276. https://www.fpl.fs.usda.gov/documnts/pdf2024/fpl_2024_hemmati002.pdf.
  6. Think Wood. "How Mass Timber Can Cut Your Construction Costs." Think Wood (blog), 2022. https://www.thinkwood.com/blog/how-mass-timber-can-cut-construction-costs.
  7. Waugh Thistleton Architects. Timber Typologies - Understanding timber options for construction. 2024. https://issuu.com/waughthistleton/docs/tduk_timber-typologies-online.
  8. Waugh Thistleton Architects. Timber Policy - Understanding low carbon policies for timber construction. 2024. https://issuu.com/waughthistleton/docs/tduk_timber_policy_report.

Fig. B1. The drawing illustrates a typical 4-over-1 mixed-use building constructed with around 250 CLT panels, compared to the thousands of elements required in traditional framing, envelope excluded. This dramatic reduction in components means fewer fasteners and adhesives, and each panel recovered represents a far greater share of the structure's total material value. When designed with reuse in mind, as this research advocates, a typical typology like this can function as a material bank, a reserve of recoverable value.

MARCH 2026  |  RESEARCH  |  NOTE C

Matrix of Circularities, An Ecosystem

This research advocates for a build-as-you-grow model: a minimal, functional core expands as demand and capital allow. Drawing on high-precision offsite manufacturing, new elements can integrate seamlessly through dry assembly, enabling the ability to expand without disrupting ongoing operations or economic activity.

The ability to disassemble–opposite of expansion–allows for circularity ensuring the system to retain recoverable value; the structure functions as a material bank rather than a locked-in cost. CLT components can be removed, reconfigured, and reused across different projects, extending material life beyond a single building. Expansion and circularity reinforce one another: the building that can grow can also contract, offering adaptability and resilience against market and environmental uncertainty.


BIBLIOGRAPHY

  1. European Commission, CORDIS. "Buildings as Material Banks: Integrating Materials Passports with Reversible Building Design to Optimise Circular Industrial Value Chains (BAMB)." Horizon 2020 Project ID 642384, 2015–2019. https://cordis.europa.eu/project/id/642384 and https://www.bamb2020.eu.
  2. Kręt-Grześkowiak, Aleksandra, Simon Bruhn, Arthur Arnt Vestergaard Jensen, and Morten Birkved. "Quantifying the Environmental Impact of Structural Timber across Multiple Future Lifecycles." Discover Applied Sciences 6, art. 197 (2024). https://doi.org/10.1007/s42452-024-05860-y.
  3. International Organization for Standardization. Sustainability in Buildings and Civil Engineering Works — Design for Disassembly and Adaptability — Principles, Requirements and Guidance. ISO 20887:2020. Geneva: ISO, 2020. https://www.iso.org/standard/69370.html.
  4. Woodcircles. "Project Overview." Woodcircles (Horizon Europe Grant Agreement No. 101082184). Accessed July 20, 2026. https://woodcircles.eu/project/.

Fig. C1.  The illustration demonstrates how Essential Seed can power an ecosystem in which CLT panels from one building lifecycle can be reused in another. The drawing explores potential scenarios showing how a typical mixed-use 4-over-1 development could respond to external forces, such as market demand. In this system, CLT panels serve as the currency. As a development goes through a reduction or expansion phase, recycled CLT panels either re-enter the ecosystem or are removed for reuse in the expansion. Thus, no single development tells the full story. Through the Essential Seed strategy, a matrix of circularities, each representing a building lifecycle, interconnects, feeding panels to and from one another, creating a system that extends beyond individual projects.

MARCH 2026  |  RESEARCH  |  NOTE D

Economics of Essential Seed

The economic viability of Essential Seed is supported by a combination of increased construction efficiency, a more adaptable building lifecycle, and alignment with supportive carbon policies. Although CLT—and mass timber more broadly—typically carries higher upfront material costs, Essential Seed offsets these premiums through faster construction timelines, reduced labor requirements, enhanced post-construction flexibility, and long-term material liquidity and recyclability.

Essential Seed’s rapid speed-to-market enables earlier revenue generation and faster occupancy. Developers and investors can leverage shorter and phased construction schedules to improve efficiency of their pro formas, stepped capital deployment, lower loan interests, and mitigate risk by avoiding long-term market speculation. Other systemic savings could further offset costs, such as a 50% reduction in on-site labor and a 60% lighter structural weight, which lowers foundation expenses.

Over the long term, economic performance is strengthened by the concept’s capacity to be recycled: reversible assemblies allow CLT panels to retain residual value to support future reuse or resale. This circular approach aligns with evolving carbon policies and green financing incentives that reward lower embodied carbon and improved sustainability outcomes compared to conventional construction methods.

Essential Seed provides developers and investors with new pathways for value and revenue creation while advancing a more resilient, flexible, and sustainable model of building construction.


BIBLIOGRAPHY

  1. HFO Investment Real Estate. "Mass Timber Development: Balancing Profit and Purpose." HFO (blog), February 18, 2026. https://www.hfore.com/mass-timber-development-and-the-new-mindset/.
  2. JLG Architects. "Mass Timber: Benefits & Challenges." JLG Architects (blog), 2025. https://jlgarchitects.com/mass-timber-benefits-challenges/.
  3. National Association of Home Builders. "Nearly 60% of U.S. Households Unable to Afford a $300K Home." NAHB Blog, March 21, 2025. https://www.nahb.org/blog/2025/03/priced-out-affordability-pyramid.
  4. Think Wood. "How Mass Timber Can Cut Your Construction Costs." Think Wood (blog), 2022. https://www.thinkwood.com/blog/how-mass-timber-can-cut-construction-costs.
  5. Gordian. Q1 2025 Construction Cost Report, cited in Maxx Builders, "Texas Commercial Construction Cost Per Square Foot: Complete 2026 Guide." Maxx Builders, 2026. https://www.maxxbuilders.com/texas-commercial-construction-cost-2025-2026/. 
  6. Multifamily.loans. "Hard Costs vs. Soft Costs for Multifamily Construction." Multifamily.loans (blog). Accessed July 6, 2026. https://www.multifamily.loans/apartment-finance-blog/hard-vs-soft-construction-costs-for-multifamily-developers/. 
  7. Kendall, Chris, Suzanne Robinson, and David Robb. Understanding the Cost of Mass Timber: Design, Drivers, and Case Studies. WoodWorks | Wood Products Council webinar presentation, September 3, 2025. https://www.woodworks.org/wp-content/uploads/presentation_slides_Kendall_Robinson_Robb_Understanding_Cost_Mass_Timber_09.2025.pdf. 
  8. Harrison, Ben. "Mass Timber for Multifamily Housing: Sustainable, Fast, and Beautiful." SCB (Solomon Cordwell Buenz), June 30, 2025. https://scb.com/2025/06/30/mass-timber-for-multifamily-housing-sustainable-fast-and-beautiful/. 
  9. Olifant LLC and Lambert Sustainability. Three Regions Explore Mass Timber. Complete study. Accessed July 6, 2026. https://www.olifant.org/three-regions. 
  10. WoodWorks Wood Products Council. Mass Timber in Affordable Multi-Family Housing. WoodWorks, 2026. https://www.woodworks.org/resources/mass-timber-in-affordable-multi-family-housing/. 
  11. CRE Daily. "Multifamily Cap Rates Vary Widely Across US Markets." CRE Daily, January 2026. https://www.credaily.com/briefs/multifamily-cap-rates-vary-widely-across-us-markets/. 
  12. Kyriakidis, Alexandros, et al. "A Practical Application of Real Options Valuation to Urban Development Projects—The Case of the Deferral Option." Urban Science 10, no. 3 (2026): 134. https://www.mdpi.com/2413-8851/10/3/134. 
  13. Appelbaum, Binyamin. "One City Might Have Just Cracked the Housing Crisis." New York Times, June 15, 2026. https://www.nytimes.com/2026/06/15/opinion/vancouver-housing-crisis-development.html. 
  14. Hughes, Chris. "This Is Why America Is Short Four Million Homes." New York Times, April 8, 2026. https://www.nytimes.com/2026/04/08/opinion/housing-loans-banks-congress.html. 





Fig. D1. The graph illustrates the financial trajectory of a typical five-story mixed-use development in an urban neighborhood in a major Texas city. Each floor plan has 14,400 square feet area, resulting in a total gross building area of 72,000 square feet. The ground floor is allocated to leasable retail space, while floors two-five consist of market-rate residential apartments. Structural system is the variable by scenario as described below. All scenarios share a common two-year pre-development phase, shown at the beginning of each graph.

1. Conventional Light Wood Frame: Total development cost is approximately $19M, derived from a blended hard cost of $215/SF (residential floors: $175–240/SF; retail: $200–260/SF) applied to 72,000 SF, plus a 25% soft cost load covering architecture & engineering, contingency, construction interest, and fees. The timeline reflects a roughly two-year construction window followed by a two-year stabilization period, reaching 90% occupancy at Year 6. Based on program location and the typology, stabilized NOI is estimated at approximately $1M per year.  The projected exit sale price reaches $22.8M at Year 7.5, a 20% premium over total cost.

2. Typical CLT Frame: CLT framing currently carries a 30–35% premium over conventional framing costs. Since framing represents roughly 20% of total costs, this translates to an approximate 8% increase in overall project cost, bringing the total to around $20.5M. However, CLT's accelerated construction pace could compresses the build schedule to approximately one year. Combined with a two-year stabilization period, the project reaches 90% occupancy at Year 5. A 12% rent premium is expected, reflecting CLT's market positioning as a premium material and the appeal of exposed wood interiors, which lifts stabilized NOI to approximately $1.12M per year. The projected exit sale price reaches $24.6M at Year 6.5, a 20% premium over total cost. Realizing this earlier exit depends on the developer's ability to capture CLT's construction time advantage.

3. CLT Frame with Essential Seed Strategy: Total project cost is comparable to typical CLT framing, but the Essential Seed approach introduces a phased delivery strategy that changes the financial profile. Phase 1 (40% of the development: the retail floor and one residential floor) completes within the first three months and immediately begins generating revenue. After nine months of operation, Phase 2 (30% of the development) adds 1.5 residential floors over the following three months while Phase 1 remains fully operational, a key structural advantage of the Essential Seed model. This revenue-generating construction cycle continues until the final phase completes at Year 4.25. Revenue generated during the phased construction period totals an estimated $1M. With phasing-related cost additions estimated at approximately $0.5M, the net effect is a project cost roughly $0.5M below typical CLT construction. An additional benefit of phased delivery is a compressed post-completion stabilization period because occupancy and lease-up are distributed across phases, the trajectory to full stabilization is steeper once the final phase delivers. The potential for disassembly and material recyclability reduces investor risk, supporting a lower cap rate. The projected exit sale price reaches $25.5M at Year 7.5, a 27% premium over total cost. Finally, the phased structure provides a built-in market hedge: if conditions shift drastically after any phase, the developer retains the option to pause, operate the completed portion, and defer the next phase, preserving capital and optionality without abandoning the project, as illustrated in the graph.

*The calculations and information presented above are derived from publicly available data and should not be considered definitive.

MARCH 2026  |  RESEARCH  |  NOTE E

Matter of Disassembly

Translating the Essential Seed from a conceptual framework into a scalable and implementable model requires the systematic design of operative mechanisms through which CLT structures can be expanded or demounted. Within this framework, disassembly is a foundational prerequisite: without structural reversibility, the core promises of material recyclability and future expansion cannot be actualized.

To enable this versatility, the design phase should define when, where, and how disassemblable and expandable connections occur, in response to the specific conditions of each project. By mapping boundaries at early stages, future expandability and recyclability can be anticipated and embedded into the structure’s DNA. Therefore, Essential Seed supports a deliberately seamful architecture, in which the joints between defined modules remain legible, accessible, and reliable over time.

The variability that makes this research applicable across diverse project types lies in its capacity to accommodate project-specific logics. Establishing clearly defined “disassembly scenarios”—ranging from single-panel recovery to the relocation of an entire structure—allows the structure to evolve from a static building into a programmable asset.

This methodology de-risks future expansion, aligns the structure with the high-velocity demands of contemporary markets, and adheres to the values of circular economy.



BIBLIOGRAPHY

  1. International Organization for Standardization. Sustainability in Buildings and Civil Engineering Works — Design for Disassembly and Adaptability — Principles, Requirements and Guidance. ISO 20887:2020. Geneva: ISO, 2020. https://www.iso.org/standard/69370.html.
  2. Kręt-Grześkowiak, Aleksandra, Simon Bruhn, Arthur Arnt Vestergaard Jensen, and Morten Birkved. "Quantifying the Environmental Impact of Structural Timber across Multiple Future Lifecycles." Discover Applied Sciences 6, art. 197 (2024). https://doi.org/10.1007/s42452-024-05860-y.
  3. European Commission, CORDIS. "Buildings as Material Banks: Integrating Materials Passports with Reversible Building Design to Optimise Circular Industrial Value Chains (BAMB)." Horizon 2020 Project ID 642384, 2015–2019. https://cordis.europa.eu/project/id/642384 and https://www.bamb2020.eu.
  4. Heisel, Felix, Alexandra Ciobanu, and Joseph McGranahan. "Design for Disassembly (DfD) Applications in the United States: Gaps and Drivers Towards a Circular Industrialized Construction Economy." Journal of Circular Economy 3, no. 3 (2025): 296–321. https://doi.org/10.55845/HLGY8054.
  5. American Institute of Architects. Buildings That Last: Design for Adaptability, Deconstruction, and Reuse. Washington, DC: American Institute of Architects, 2019. https://www.aia.org/sites/default/files/2024-11/AIA_Design_Deconstruction_Adaptability_Reuse.pdf. 
  6. Ostapska, Katarzyna, Petra Rüther, Arianna Loli, and Klodian Gradeci. "Design for Disassembly: A Systematic Scoping Review and Analysis of Built Structures Designed for Disassembly." Sustainable Production and Consumption 48 (2024): 377–95. https://doi.org/10.1016/j.spc.2024.05.014.
  7. Hasani, Nastaran, and Mariapaola Riggio. "Design for Adaptability in Mass Timber: A Survey-Based Analysis of Stakeholder Roles, Digital Tools, and Decision-Making Flow." Frontiers in Built Environment 11 (2025): 1698068. https://doi.org/10.3389/fbuil.2025.1698068.


Fig. E1. The figure illustrates how the example of a 72,000 SF (14,400 SF / floor plate) typical 4-over-1 building can be designed and constructed using just 300 standardized CLT panels, envelope excluded. Due to fewer components compared to conventional systems, the type, role, and sequence of panel use can be anticipated, allowing design for disassembly to be planned from the earliest stages of the project.

MARCH 2026  |  RESEARCH  |  NOTE F

Three Scenarios of Disassembly

The following three design scenarios investigate how disassemblable CLT structures could perform within the contemporary construction industry.

1. The Panel, The Module: In this scenario, the CLT panel functions as raw inventory with potential intrinsic resale value. The design strategy imposes no design requirements on the future application of the panel. The goal is to make the CLT panel available for future reuse as simply another panel, detached from any specific system of details or joinery. By prioritizing, at the design stage, the ability for most structural panels to be reused in entirely different projects, the building effectively becomes a future material bank. In this way, reclaimed panels can compete directly with new CLT panels within the construction supply chain. For example, within this framework, if 80% of CLT panels in a house are recyclable, it implies that 4 out of 5 panels can be repurposed in another CLT structure, just as how new panels would be used.

2. The Whole, The Module: The CLT panels used in a structure come together in a specific and detailed way that almost all of the structure can be disassembled and reassembled exactly in the same way in a different location. The result is a CLT structure with precise connection details, enabling efficient assembly and disassembly with minimal time and labor requirements. Unlike the previous scenario, this approach defines recyclability as the perpetual replication of a singular specific design. This approach allows for other parties of the construction industry (furniture, plumbing, finishing, etc.) to plan their products and services in advance according to a single structural design, as if the structure becomes an infrastructural object available to everyone to plug-in their custom variability. The specific joinery design required for this scenario resembles the craft of traditional wood joinery and performs as a modern interpretation of historically and culturally rich woodworking practices. 

3. The Variable Module: This scenario is a hybrid of previous ones. The resulting structure is an assemblage of standardized units made out of CLT panels. The connections between those units are made to be easily disassembled, however, each unit assembles with specific connections and details. Connections between units utilize the flexibility of "The Panel" scenario, while the units themselves retain the specific detailing of "The Whole.”  Depending on the specific condition of a project, what constitutes a unit can be defined. For instance, a roof-to-column detail or the four walls of a room can both be units for two different projects. Once units from different buildings get reused and recycled, they can form a design that is seamfull, heterogeneous, and architecturally complex.


BIBLIOGRAPHY

  1. Waugh Thistleton Architects. Commercial Timber Guidebook. 2025. https://issuu.com/waughthistleton/docs/ctgb_doc_final_print_pages.
  2. Waugh Thistleton Architects. New Model Building Guide Book. 2025. https://issuu.com/waughthistleton/docs/nmb_guide_book-1.1.
  3. International Organization for Standardization. Sustainability in Buildings and Civil Engineering Works — Design for Disassembly and Adaptability — Principles, Requirements and Guidance. ISO 20887:2020. Geneva: ISO, 2020. https://www.iso.org/standard/69370.html.
  4. New York Times Editorial Board. "America Needs to Build More Housing." New York Times, May 18, 2026. https://www.nytimes.com/interactive/2026/05/18/opinion/affordable-housing-america.html. 


Fig. F1.  The drawing shows a comparison between the three disassembly scenarios discussed in this note, applied to the example of a typical 4-over-1 mixed-use building. In the Panel Module scenario, the structure is conceptualized as a repetition of assemblies made up of four panels, each with the ability to be restored, representing a more granular approach compared to the others. In the Whole Module scenario, an entire floor, including both wall and floor CLT panels, is considered as a single module. In the Variable Module scenario, one quarter of the floor plan is treated as a module, offering greater flexibility in assembly compared to the Whole Module scenario. The phasing across all three scenarios remains the same, with the ground floor (retail) and second floor forming the Essential Seed, demonstrating that disassembly scenarios can be determined independently of Essential Seed phasing.

APRIL 2026  |  RESEARCH  |  NOTE G

Single-Family Homes:

The application of Essential Seed to single family homes means to imagine a more dynamic lifecycle: build a minimum viable CLT dwelling with expansion and reversibility designed in from the start, expand as income and resources grow, and downsize and sell the panels later when needs change. A house then, in this model, becomes adaptable and capable of evolving alongside its residents.

This strategy responds to a widening gap in the U.S. housing market. First-time buyers account for just 21% of home purchases, an unprecedented low, and the median age of a first-time buyer has risen to 40. At the same time, a median new home of around $450,000 is unaffordable for 75% of U.S. households (fortune.com, nahb.org). A minimum viable (Essential Seed) dwelling at approximately $300,000 and smaller size of the median home could reduce the qualifying income threshold by 40%, effectively doubling the number of buyers. The recyclability of CLT panels, when downsizing, adds another financial dimension, partially offsetting the initial cost premium over conventional framing in the long run. In addition, conventional framing offers none of the flexibility, recyclability, or life-stage adaptability that is inherent in Essential Seed strategy.

However, there are barriers preventing this model’s mainstream market adoption, including these three: financing, appraisals, and lifestyle habits. First, It’s hard to imagine a lender today determining a mortgage on a 900-square-foot seed home based on its expansion potential, so a phased and more dynamic financing structure needs to be created, likely through institutions like CDFI or state housing finance agencies. Second, without a cluster of comparable seed home sales, individual projects appraisal values are set by neighboring light-frame houses, which can pose a risk to builders’ planned exit sale valuation and proforma assumptions. Third, culturally, many U.S. home buyers expect a finished and complete product when purchasing a home. The “build-as-you-grow” premise asks them for a substantial and challenging behavioral shift. Yet, the surge in ADU construction and major remodelling projects over the past decade suggests a growing appetite for hands-on, incremental, and owner-directed building. As this trend continues, Essential Seed may find an increasingly favorable reception among the U.S. population.

The trajectory is clear: every year, less and less U.S. households are able to afford buying a home, which suggests there’s an opportunity and market for systematically exploring other models of constructing a home. This research explores Essential Seed at a technical level while also outlining financial, zoning, and policy developments required to support it. It is guided by the optimism that the “build-as-you-grow” model gets broad public acceptance, especially the three-quarter of the population who are currently unable to afford homeownership.


BIBLIOGRAPHY

  1. National Association of Realtors. "First-Time Home Buyer Share Falls to Historic Low of 21%, Median Age Rises to 40." Press release, November 4, 2025. https://www.nar.realtor/press-releases/first-time-home-buyer-share-falls-to-historic-low-of-21-median-age-rises-to-40. 
  2. Zhao, Na. Nearly 75% of U.S. Households Cannot Afford a Median-Priced New Home in 2025. NAHB Special Study, Housing Economics. Washington, DC: National Association of Home Builders, March 2025. https://www.nahb.org/-/media/NAHB/news-and-economics/docs/housing-economics-plus/special-studies/2025/special-study-households-priced-out-of-the-housing-market-march-2025.pdf. 
  3. National Association of Home Builders. "Nearly 60% of U.S. Households Unable to Afford a $300K Home." NAHB Blog, March 21, 2025. https://www.nahb.org/blog/2025/03/priced-out-affordability-pyramid.
  4. Hughes, Chris. "This Is Why America Is Short Four Million Homes." New York Times, April 8, 2026. https://www.nytimes.com/2026/04/08/opinion/housing-loans-banks-congress.html. 


Fig. G1.  The drawing compares a 1,400 SF typical shotgun house, studied through boundaries of the three disassembly scenarios. The structure is conceived as a hybrid system, where conventional assemblies, including ceiling, roofing, wall, and window components, are integrated into a CLT armature, as a fully CLT house would be too costly in the current market to justify Essential Seed’s phasing strategy. The drawing represents the house after completion of the Essential Seed (950 SF) and the first expansion phase (450 SF).

JUNE 2026  |  RESEARCH  |  NOTE H

ReCLT: Closing the Loop

The Matrix of Circularities (Note C) assumes that a recovered panel can always find the next application. ReCLT, cross-laminated timber manufactured from recycled rather than virgin wood, is the procedure that makes this assumption hold even when a panel can no longer be reused directly. It’s projected to be a more affordable and sustainable material with a comparable lifespan to CLT.

Within the Essential Seed framework, ReCLT performs as the base tier of a recycling hierarchy. The first tier remains whole panel reuse in a next project: a panel recovered through a designed disassembly scenario retains nearly all of its embodied energy and economic value, and re-enters the ecosystem as simply another panel. However, not every panel survives its first life. Panels compromised by damage, moisture exposure, penetrations accumulated over decades of usage, or geometries too specific to find a future project would not be eligible for reuse and would be discarded. ReCLT captures this otherwise loss by converting those panels into raw input for new panel production.

This base tier can boost the economics described in Note D in favor of the Essential Seed approach. The residual value of a CLT structure is typically discounted by the uncertainty of recovery: decades in advance, what percentage of panels will survive disassembly in reusable condition. ReCLT reduces this uncertainty by establishing a value floor. Even a panel that cannot be reused retains measurable value as certified feedstock rather than becoming waste. A more predictable base value supports the lower cap rates, the material liquidity, and the lender confidence on which the Essential Seed framework is modeled. At the same time, panels that are unsuitable for reuse continue to contribute to the ecosystem by providing documented, traceable, and dry-assembled sources of structural timber that ReCLT manufacturers can include into future production planning. This base tier ensures no panel exits the system; it only changes the recovery method.


BIBLIOGRAPHY

  1. Woodcircles. "Coming Full Circle: Wood and the Circular Economy." Woodcircles news, March 21, 2024. https://woodcircles.eu/coming-full-circle-wood-and-the-circular-economy/. 
  2. Vasuks, Peteris, Ilze Vamza, Megija Valtere, Tereza Bezrucko, and Dagnija Blumberga. "Recycled Cross-Laminated Timber as a Low Environmental Impact Alternative to Virgin Material: Latvia Case Study." Case Studies in Construction Materials (2024). https://www.sciencedirect.com/science/article/pii/S2214509524012464. 
  3. The Urban Woods. "From Pallet to Palace: State-of-the-Art High-Rise Made from Waste Wood." The Urban Woods Newsroom, July 8, 2024. https://www.theurbanwoods.com/newsroom/238959-from-pallet-to-palace-state-of-the-art-high-rise-made-from-waste-wood/. 
  4. NL Times. "Delft Apartment Building to Be Constructed from Wood Pallets, Reclaimed Materials." NL Times, July 8, 2024. https://nltimes.nl/2024/07/08/delft-apartment-building-constructed-wood-pallets-reclaimed-materials. 


JUNE 2026  |  RESEARCH  |  NOTE I

CLT Lifespan and Current Recycling Practices

Life cycle assessment (LCA) studies of CLT structures typically estimate a service life of 50–60 years for CLT panels, with some projections extending to around 100 years under appropriate maintenance routines. This longevity creates an opportunity for material reuse: the first generation of reclaimed CLT panels could enter the secondary market with decades of certified service life remaining. However, industry-wide standards for inspecting, regrading, recertifying, and warranting reclaimed CLT panels have yet to be established. Developing these protocols, including panel passports that document manufacturing origin, structural loading history, environmental exposure, maintenance records, and remaining certified life, is essential if reclaimed panels are to function as assets rather than salvage within a circular material economy.

Current end-of-life practice today is either downcycling through additional processes into secondary products or disposal. The former consumes additional energy and the latter forfeits the embodied value. Reusing of the whole panel preserves nearly all its embodied carbon, energy, and economic value. 

Encouragingly, As mentioned in Note H, the industry is beginning to close the loop from the supply side: ReCLT manufacturing offers a destination for material that cannot be reused as whole panels, confirming that a reverse supply chain for CLT is technically and environmentally viable. Because industrial CLT production only began in the late 1990s, almost no CLT building has yet reached the end of its first service life, so large-scale deconstruction practices, recovery logistics, and secondary markets are largely untested. The first generation of systematically-disassembled CLT buildings will establish the benchmarks for recovery labor, resale valuation, and certification standards that will affect the future circular timber economy.

This emerging condition is precisely where this research positions itself. The buildings designed today under this framework are the supply chain of the 2050s: every reversible connection specified now enables a future transaction, and every disassembly scenario documented now makes a future appraisal possible. Rather than facing how difficult unplanned deconstruction is, the Essential Seed framework treats the panel's second and third lives as design inputs from day one. The lifespan of CLT, in this framing, is not the single lifecycle of a building, but the cumulative duration of its circulation, a duration this research seeks to maximize by ensuring that the simplest, fastest, and most economically valuable end-of-life pathway is always the recovery and reuse of the whole panel.


BIBLIOGRAPHY

  1. Hurmekoski, Elias, et al. Innovative Practices of Wood Industries in the Circular Economy in Europe. WoodCircus Deliverable D3.2 final report. Zenodo, 2022. https://zenodo.org/records/5865052.   
  2. Rizos, Vasileios, et al. Improving Waste Wood Circularity in the EU: Classification Frameworks. CEPS/ERCC report prepared for the Wood2Wood project, November 2024. https://cdn.ceps.eu/wp-content/uploads/2024/11/2024-14_ERCC_Wood2Wood.pdf.  
  3. Stora Enso. Environmental Product Declaration: CLT by Stora Enso. EPD per ISO 14025 / EN 15804. Stora Enso Wood Products, May 2024. https://www.storaenso.com/-/media/documents/download-center/certificates/wood-products-approvals-and-certificates/epd/stora-enso-epd-clt---may-2024.pdf. 
  4. Kręt-Grześkowiak, Aleksandra, Simon Bruhn, Arthur Arnt Vestergaard Jensen, and Morten Birkved. "Quantifying the Environmental Impact of Structural Timber across Multiple Future Lifecycles." Discover Applied Sciences 6, art. 197 (2024). https://doi.org/10.1007/s42452-024-05860-y. 
  5. Besserer, Arnaud, Sarah Troilo, Pierre Girods, Yann Rogaume, and Nicolas Brosse. "Cascading Recycling of Wood Waste: A Review." Polymers 13, no. 11 (2021): 1752. https://doi.org/10.3390/polym13111752. 
  6. Younis, Adel, and Ambrose Dodoo. "Cross-Laminated Timber for Building Construction: A Life-Cycle-Assessment Overview." Journal of Building Engineering 52 (2022): 104482. https://doi.org/10.1016/j.jobe.2022.104482. 
  7. GreenSpec. "CrossLam Timber / CLT: A Brief History." GreenSpec. Accessed July 6, 2026. http://www.greenspec.co.uk/building-design/crosslam-timber-history-and-production/. 


JULY 2026  |  RESEARCH  |  NOTE J

What Buildings Actually Die Of

Demolition surveys covering more than 14,000 buildings across the U.S. and Europe report average observed lifetimes of 91 years for wood-frame buildings and 67 years for concrete and steel buildings, with demolished US residential buildings averaging 85 years. These figures exceed the 50-to-60-year estimated lifespan of CLT structures.

The empirical record suggests what buildings actually die of is decisions, not deterioration. A survey of 227 demolished North American buildings found that only eight cited a specific structural failure; the dominant reasons were changing land values, inability to accommodate contemporary needs, and neglect of non-structural components. More than half of all demolished buildings in that survey were between 26 to 50 years old, proving the 50-to-60-year estimated lifespan for CLT structure is less restrictive than it first appears. 

Economic obsolescence, the main cause of building demolitions, is the condition Essential Seed framework is designed to mediate. A structure that can expand, contract, and reconfigure in response to market demand introduces dynamism into an otherwise static typology. An Essential Seed structure provides owners with a spectrum of adaptive strategies—including reduction, expansion, reconfiguration, and disassembly—offering resilient alternatives to the conventional binary choice between continued use and demolition.


BIBLIOGRAPHY

  1. Berglund-Brown, Juliana, Isaac Dobie, Jordaina Hewitt, Catherine De Wolf, and John Ochsendorf. "Lifetimes of Demolished Buildings in US and European Cities." Buildings & Cities 6, no. 1 (2025): 1099–1116. https://doi.org/10.5334/bc.588. 
  2. O'Connor, Jennifer. "Survey on Actual Service Lives for North American Buildings." Paper presented at the Woodframe Housing Durability and Disaster Issues Conference, Las Vegas, NV, October 2004. Forintek Canada Corp. https://cwc.ca/wp-content/uploads/2013/12/DurabilityService_Life_E.pdf. 
  3. Dezeen. "Demolished Buildings 16 Years Older in US than in Europe, Report Finds." Dezeen, January 8, 2026. https://www.dezeen.com/2026/01/08/demolished-buildings-report-europe-us/.