Custom ADU Builders in Sumas, Washington
Custom ADU Builders in Sumas, Washington
Make your property part of your family’s long-term plan. OSHN Designs helps Sumas homeowners explore thoughtful ADUs for aging parents, adult children, and changing needs.
A little more room for the people you love.
An ADU is a significant decision about more than extra floor space. It may help your parents stay connected to family or give the next generation a separate place to live. For a Sumas property, we begin with what you want this investment to do for your household, then work through the practical choices that make a home useful now and adaptable over time. We don’t promise appreciation or a financial return.
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.
Planning an ADU on your Sumas property.
Start with the parcel’s jurisdiction, available services, and applicable building requirements.
Ask the appropriate authority to confirm whether floodplain mapping, drainage, or other site conditions affect the property and proposed ADU location. Those findings may influence feasibility and design, and need to be understood before committing to a layout or construction budget. No parcel’s suitability can be determined from its mailing address alone.
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 building an ADU in Sumas
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An ADU may be possible depending on the local rules and conditions that apply to your property. Zoning, access, utilities, and site characteristics are important considerations before moving forward.
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Think about how your parents will use the space today and what might make everyday living easier in the future. A comfortable layout, convenient entry, privacy, and accessibility considerations can all play an important role.
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Timelines vary depending on design decisions, permitting, site conditions, and construction requirements. As we learn more about your project, we can discuss a realistic schedule and the steps involved.
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It's a relaxed, 20-minute conversation about your property, your family, and what you're imagining. We'll answer initial questions, learn about your goals, and discuss potential next steps.
What could your Sumas ADU make possible?
We’d love to hear about your property and what you’re imagining for your family.