For homeowners in Bellingham and Whatcom County who want to build sustainably, A1DesignBuild is a net-zero home builder with deep experience in high-performance, energy-efficient construction. Our design-build team specializes in many home innovation approaches, including Structural Insulated Panel (SIP) building methods, which create a tighter, better-insulated building envelope than conventional framing. This approach of course lowers both energy bills and environmental impact over the life of the home.

As an employee-owned cooperative rooted in Whatcom County for more than 75 years, sustainability isn't just an empty slogan for us. Sustainability and smart building is in our DNA, and built into how we design and construct every project, from custom new homes to additions and ADUs. We work with homeowners from the earliest design stages to identify where high-performance building methods make the most sense for their budget and goals, whether that means a fully net-zero home or targeted energy-efficiency upgrades and remodels.

This approach extends across our project types: sustainable custom home building, energy-efficient whole-home remodels, and high-performance accessory dwelling units (ADU’s). We're also active in the broader Whatcom County sustainability community through our nonprofit initiative, A1andALL.

If sustainable, energy-efficient building is a priority for your next project in Bellingham or Whatcom County, to talk through all the great net-zero and high-performance options available today. Together, we can come up with something both practical and beautiful.

Until then - salud!

Sustainable & Net-Zero Home Building — FAQ

What does "net-zero" mean for a home in Bellingham?
A net-zero home produces as much energy as it uses over the course of a year, usually through a combination of a highly efficient building envelope and on-site solar. In Bellingham and Whatcom County's climate, that starts with cutting energy demand through better insulation and air-sealing before adding solar — which is where our SIP construction methods come in.

What are Structural Insulated Panels (SIPs), and why do you build with them?
SIPs are prefabricated wall and roof panels with a rigid foam core sandwiched between structural facings. Compared to conventional stick-framing, they create a tighter, more consistent building envelope with fewer gaps for air and heat to escape — which translates directly into lower energy bills and a more comfortable home year-round.

Does building a net-zero or high-performance home cost more upfront?
High-performance construction typically carries a higher upfront cost than a conventional build, largely due to materials and design. That cost is offset over time through lower utility bills, and in many cases by state or utility efficiency rebates. We walk through the real cost-benefit numbers for your specific project during your free design consultation, rather than quoting a generic percentage that may not apply to your home.

Can an existing home be remodeled to be more energy-efficient, or does it have to be new construction?
Both. While net-zero performance is easiest to achieve in new construction, we also do energy-efficient whole-home remodels and additions that meaningfully cut energy use in existing Bellingham and Whatcom County homes — better insulation, air-sealing, high-performance windows, and efficient mechanical systems, even without a full rebuild.

Are accessory dwelling units (ADUs) built to the same sustainability standards?
Yes. We apply the same high-performance building methods, including SIP construction, to our ADUs and backyard cottages as we do to full custom homes — so a smaller structure doesn't mean a less efficient one.

Are there rebates or incentives available for sustainable building in Washington State?
Depending on the project, there can be utility and state incentives for high-efficiency construction and upgrades. Program availability changes, so we review current rebate options with homeowners as part of the design process rather than relying on a fixed list that may be out of date by the time you build.

What areas do you serve for sustainable and net-zero home building?
We build throughout Whatcom County, including Bellingham, Ferndale, Lynden, and Blaine.

How do I get started on a net-zero or high-performance home project?
Every project starts with a free design consultation, where we talk through your goals, site, and budget and outline what a high-performance approach would look like for your specific home. Schedule a consultation to get started.