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Leading the Way in Mass Timber

XL was one of the earliest adopters of mass timber. In partnership with forward-thinking clients, we have invested in researching, developing and rethinking the entire process of how buildings are built. Now we are leading the way in providing mass timber as a more sustainable solution to a wide range of clients throughout the Bay Area.

From small scale education facilities to large corporate office buildings, we are delivering a diverse range of mass timber structures while supporting our partners with a common goal: to build better, faster, more sustainably and have a positive impact on the environment.

Why Mass Timber?

When we build with sustainable timber, we decrease the embodied carbon of a building by 15-30%. Our deep mass timber expertise and innovation has also enabled us to standardize mass timber solutions to be more cost effective. Our clients have reaped the benefits of faster project delivery as well as enhanced occupant experience through biophilic design. Using sustainable timber as a building material, we create environments that inspire ideas, promote whole-body wellness and encourage productivity.

A Successful Approach

Successful mass timber projects don’t occur by accident; they require extensive planning and collaboration – as early as during the conceptual stage – in order for a project to proceed smoothly and efficiently. This means completely rethinking the traditional sequencing of a project, procuring resources, onboarding partners and making design decisions early in order to ensure quality, schedule and budget goals can be achieved.

Our Expertise

As innovators and early adopters in mass timber, our capabilities and expertise in this sustainable building solution run deep. Our mass timber services include:

  • General preconstruction
  • Timber modeling
  • Construction logistics/sequencing/erection
  • Mass timber fabricating/procurement
  • Onboarding of mass timber manufacturers and partners
  • Design integration/timber structure and building systems
  • Timber erection
  • Timber protection/weather mitigation plan
  • QA/QC process


As early adopters and leaders in mass timber building, we have developed our own proprietary prefabricated mass timber solution Timberquest, that is increasing accessibility of all the benefits of mass timber to a broader audience. Features include:

  • California DSA pre-approved for rapid installation at California K-12 public schools and community colleges
  • Cost-competitiveness
  • Energy efficiency
s.f. in mass timber projects
mass timber building in Sunnyvale for leading tech giant
below baseline carbon reduction on mass timber projects
metric tons of carbon sequestered in built projects to-date
metric tons CO2 avoided through wood construction

From the architects MGA and Sera to XL Construction, it is the dream team. I feel very honored and privileged to lead them.

David Gensemer
Development Executive, on leading the team for Google's first mass timber project in Sunnyvale, Google

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