Handbook for CLT Details and Mass Timber Design: 30 Reference Details for Scaling Up Timber Construction

This research clearly maps out the key improvements and optimisation opportunities in multi-storey timber construction. From smart timber detailing to carefully considered CLT design, the handbook presents 30 fully developed LoD 500 details that can be applied directly in both design and construction practice.

By analysing twenty realised timber residential buildings, Urban Climate Architects and MAATworks have developed an accessible and practice-oriented handbook that provides clear guidance for the scaling up of high-quality mass timber construction.

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Our vision

Why standardisation is essential for mass timber design

Why standardisation is essential for mass timber design

Interest in biobased and mass timber housing is growing rapidly. To truly scale up timber construction, design teams need to work with a shared language, common principles and a consistent quality level of CLT detailing. Standardisation provides clarity, speeds up decision-making and makes timber construction more predictable and scalable—exactly what is needed to accelerate both the housing challenge and our climate ambitions.

Why details make the difference

In multi-storey timber construction, performance is determined in the details: fire safety, acoustics, structural stability and services integration. When these aspects are properly resolved, projects can be delivered faster, with higher quality and less engineering effort.

With repeatable, high-quality mass timber details, architects, engineers and contractors can design and build with confidence. This is how timber construction truly comes of age.

Why details make the difference

In multi-storey timber construction, performance is determined in the details: fire safety, acoustics, structural stability and services integration. When these aspects are properly resolved, projects can be delivered faster, with higher quality and significantly less engineering effort.

With repeatable, high-quality mass timber details, architects, engineers and contractors can design and build with confidence. This is how timber construction matures—from bespoke experimentation to a robust, reliable building system.

What every architect should know about CLT detailing

  • Detailing offers major opportunities to scale up timber housing.
  • Fire safety, acoustics, moisture control and structural stability are the four core pillars.
  • The research delivers 30 directly applicable LoD 500 mass timber details.
  • Consistent, standardised details accelerate design, engineering and construction.
  • The handbook serves as an open knowledge resource for high-quality timber construction.
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Referentiedetails en lessen uit Nederlandse woongebouwen

Learning from 20 realised timber residential buildings

  • Section 1 – Why high-quality detailing is the key to scalable timber construction.
  • Section 2 – Analysis of twenty realised timber housing projects.
  • Section 3 – Building physics performance and technical insights.
  • Section 4 – A solid foundation for faster, more predictable and affordable timber construction.
  • Application in projects

  • The Urban Woods Delft – application of the reference details in a fully timber residential building.
  • C-CLT pilot projects – alignment with circular CLT research in collaboration with TNO.
  • Ringpass Delft – a timber sports complex with performance-driven detailing.
  • Download the handbook

    Download the handbook
    Referentiedetails en lessen uit Nederlandse woongebouwen

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    Amy Stuik

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    Methodology

    Research methodology: from analysis to handbook

    This research was initiated by Built by Nature and carried out by Urban Climate Architects in collaboration with MAATworks. By bringing together design, engineering and research, the study provides clear insight into the constructive detailing of multi-storey timber buildings in the Netherlands—and what is required to genuinely accelerate the scaling up of biobased construction.

    For this research, we:

    • selected recently completed timber residential buildings
    • analysed construction details down to 1:5 scale
    • assessed acoustics, fire safety and structural performance in an integrated manner
    • combined on-site measurements, interviews and technical drawings

    The result is a concrete overview of proven solutions and recurring bottlenecks in CLT construction in the Netherlands, engineered timber buildings, and solid timber housing.This creates a valuable knowledge base for architects, developers and contractors aiming to deliver biobased buildings, apply circular materials, and achieve a healthy residential quality.Timber construction will only reach real scale when design, engineering and buildability are aligned from the very beginning. With this research, we bring that future closer—circular, Paris Proof and fully focused on decarbonisation.

    Working together

    This research is the result of close collaboration with a broad network of partners:
    Built by Nature · MAATworks · TNO · TU Delft · European Network for Mass Timber Construction · World Green Building Council · BiodiverCities · Wood Works · Stichting HoutbouwNL · Biobased Creations · ESG Real Estate · Dutch Green Building Council (DGBC)

    Conclusion

    The findings of this research position timber construction for widespread application. Through shared references, technical clarity and an open-access handbook, a sector-wide foundation is created for high-quality mass timber housing.This supports both the construction industry and policymakers in accelerating biobased, low-carbon residential development—in the Netherlands and beyond.

    Download the handbook
    Referentiedetails en lessen uit Nederlandse woongebouwen

    projects

    Application in projects

    Discover how we translate the research findings into practice.

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    Handboek voor clt details. Schematische weergave van krachtsafdracht en stabiliteit in CLT-bouwsystemen.

    About Urban Climate Architects

    Urban Climate Architects designs cities where people can live healthy, comfortable lives. Through sustainable construction, biobased building and climate-adaptive urban design, we make the future tangible—from the very first urban decision.

    Research contact person:

    Get in touch for more information or collaboration.

    Amy Stuik

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