Custom ADU Builders in Bellingham, Washington
Custom ADU Design & Build in Bellingham, WA
Keep family close without giving up a space of your own. OSHN Designs helps Bellingham homeowners explore, design, and build custom ADUs for aging parents, adult children, and changing family needs.
A little more room for the people you love.
You may want your mom close enough for dinner, but with a quiet home of her own. Or a place where your adult child can build independence while staying connected to family. For homeowners in Bellingham, an ADU starts with a practical question: can the property you already have make room for the people you love? We listen first, then shape the possibilities around your family, your site, and your priorities.
A Home for
Aging Parents
Keep parents close, with a comfortable space designed around privacy, independence, and everyday connection.
A Home for
Adult Children
Make room for the next chapter with a separate living space and family support nearby.
A Home for
Changing Family Needs
Plan a flexible home that can support your family today and adapt as priorities change.
What to know about building an ADU in Bellingham.
Start with the property address—not just its mailing city—to confirm the permitting jurisdiction. Before committing to a design, discuss current ADU requirements, utility service, access, and site conditions with the appropriate authority. Property-specific zoning and permitting information for this guide still needs verification.
The OSHN Approach
Relationship first.
Every step of the way.
Choosing an ADU designer and builder is about more than a floor plan. OSHN brings planning, design, permitting, and construction into one collaborative relationship, with clear guidance for your property and your family’s goals.
✓ Relationship First
A thoughtful home starts with listening.
✓ Clear Communication
Clear guidance, from planning and permitting through construction.
✓ Quality
Careful craftsmanship. Beautiful, functional spaces built to last.
“They took the time to explain the entire process clearly, which made everything feel smooth and stress-free.”
Tannis Peura
Google review · ★★★★★
A Clear Path Forward
Your ADU design-build process.
1.
Book a 20-minute consultation.
Tell us about your family and the space you’re imagining.
2.
Explore your property & goals.
Consider access, utilities, site conditions, and the questions that need answers.
3.
Plan and design together.
Shape the layout, scope, and details around your priorities.
4.
Build with care.
Bring the plans to life through thoughtful craftsmanship and clear communication.
Questions about your Bellingham ADU
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Bellingham has regulations for accessory dwelling units, but what's possible depends on your specific property and the applicable development standards. Before making design decisions, it's important to understand your property's requirements, access, and utility connections.
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A detached ADU may be an option, depending on your property and the city's requirements. Available space, building placement, access, and utilities are all important considerations. We can help you explore how a custom ADU might fit your property and your family's needs.
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Yes, an ADU may be a wonderful way to create a separate home for your parents while keeping them close. We can explore a comfortable layout, privacy, accessibility considerations, and the details that make everyday life easier.
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Start with a conversation! Our 20-minute consultation is a chance to tell us about your property, your family, and what you're imagining. We'll discuss your goals and potential next steps.
Let’s talk about your Bellingham ADU.
We’d love to hear about your property and what you’re imagining for your family.