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ADU & DADU Builder in Bellingham, WA

High Quality Construction + Exceptional Project Management

Plan your ADU with a clear path from idea to construction.

Whether you're looking for a space for family, a rental opportunity, or a place to work, an ADU or DADU can give you the extra space you need right on your property.

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We help Bellingham and Whatcom County homeowners evaluate what's possible, plan the right approach, and manage the construction process from start to finish.

Not sure where to start?

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You don't need to have plans or all the details figured out. In a consultation call, we'll talk through your goals, your property, and the next steps. It's a great way to get answers and see if we're the right fit for your project.

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Typically 45 minutes  |  Phone Call

Can you build an ADU on your property?

Every property is different. We'll help you understand the possibilities and considerations before you invest in design and plans.

​​​Zoning & development restrictions and requirements​

Site layout and access

Utilities and site work

Existing structures

Budget and scope

Process and plan

ADU contractor bellingham whatcom county
adu contractor bellingham wa walker building company

How much does it cost?

The cost of an ADU depends on the type of unit, size of unit, site conditions, utilities, design, and finish selections. Here's a general range.

$170,000 - $600,000+​​

Typical cost range for ADUs in the Bellingham area.​​

Project Spotlight

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An Alabama Hill basement was transformed into a separate rental unit with its own private entrance, creating additional living space and a new income opportunity for the homeowner.

Alabama Hill Basement ADU

basement ADU bellingham

ADU FAQs

Let's talk about your ADU project.

Whether you are just exploring options or you already have construction plans, we can help you navigate your project with confidence. Schedule a short consultation to share your vision, and we’ll provide expert guidance and clear next steps so you know exactly how to move forward with your ADU.

CONTACT

Walker Building Company

1106 Harris Avenue, Suite 302

Bellingham, WA 98225

LOCATED IN FAIRHAVEN

Proudly serving Bellingham, Ferndale, Lynden, Blaine, and all of Whatcom County.

360-628-2179

Contractor License WALKEBC777PB

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2026 Walker Building Company, LLC

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