Custom ADUs in Bellingham & Whatcom County
More room for family. More room for life.
OSHN Designs is a custom accessory dwelling unit (ADU) design-build company serving Bellingham and Whatcom County, Washington.
We partner with homeowners to plan, design, permit, and build thoughtful, well-crafted spaces for aging parents, adult children, and changing family needs, keeping family close while giving everyone a home of their own.
Custom ADUs for your family’s next chapter.
Who are you making room for?
Homes for
Aging Parents
An ADU for aging parents offers a private home close to family, with comfort and future accessibility in mind.
Homes for
Adult Children
Create an independent home for adult children, with everyday connection just a few steps away.
Homes for Changing
Family Needs
Plan a flexible ADU for multigenerational living and the ways your family’s needs may change.
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.
From an initial conversation to construction, we help you understand your property’s possibilities, design choices, permitting steps, and what comes next. You don’t need every detail figured out to begin.
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Book a 20-minute consultation.
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Explore your property & goals.
3.
Plan and design together.
4.
Build with care.
A Real OSHN Family Story
A home for Mom. Closer to family.
Mom was living in a second-floor apartment. Morgan and Jay wanted her closer to family, and built an ADU solution to make that possible.
ADU questions: property, process, and cost.
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It depends on the property, location, access, utilities, and applicable local requirements. A 20-minute consultation is a good place to share your goals and learn what the next step may be.
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Every project is different. Size, design, site conditions, utilities, finishes, and permitting requirements can all affect the investment. We’ll talk about your goals and budget expectations as part of the process.
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Timelines depend on the property, design decisions, permitting, and construction scope. We’ll work to set realistic expectations as your project takes shape.
Build for today. Think in generations.
What do you want to leave for your kids?
An ADU can be more than a solution for right now. It’s a way to put the land and resources you have today toward something lasting: a home for family, more choices for your children, and the potential to build generational wealth. At OSHN, we help you explore what you can build with the next generation in mind.
Thinking about keeping land in the family through a trust? Talk with an estate-planning attorney and financial adviser about ownership, taxes, and inheritance. OSHN’s role is to help you plan, design, and build the home; property value and financial returns are not guaranteed.