Build Your ADU in Whatcom County. Done-For-You, Permit to Keys.

The fastest way to get our team out to walk your property is the form →. Loren gets your details by text the moment you submit.

Book Free Walkthrough (360) 594-0120
Same-Day Response Dedicated Permit Specialist Whatcom GIS Automation 2026 County ADU Laws
Fastest Way to a Walkthrough

Free Feasibility Study

The fastest way to get our team out to your property. Submit this and Loren, our permit specialist, gets your details by text instantly — he'll reach out the same day to schedule a walkthrough. Full GIS + 2026 land use analysis lands in your inbox within 48 hours.

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Property
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Details
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Contact

Same-Day Response • No Obligation • Texted to Loren Instantly

Prefer to talk first? Call (360) 594-0120— but the form is the fastest way to get us out to your property.

3 Simple Steps to Your ADU

1

Free Feasibility Study

Whatcom GIS Analysis. Is your lot eligible?

2

Full Permit Package

Land use + building permits. We handle everything.

3

Letter of Intent + Build

Architect, permits, builder — all in one.

Start Your ADU Project

FREE FEASIBILITY STUDY · FREE PERMITS WHEN WE BUILD

Questions? Call (360) 594-0120 — Mon–Fri 8am–5pm

ADU Guides & Resources

Everything you need to know before building an ADU in Bellingham and Whatcom County.

Most Read

ADU Cost Breakdown

How much does an ADU cost in Whatcom County? Complete 2026 pricing by type.

 Essential

ADU Laws & Regulations

Bellingham and Whatcom County ADU rules, setbacks, and size limits.

 Start Here

Can I Build an ADU?

Quick eligibility checklist based on your lot, zoning, and property type.

 Finance

ADU Financing Options

HELOCs, construction loans, and ADU-specific financing for WA homeowners.

 Planning

Construction Timeline

Month-by-month breakdown from design to move-in for Whatcom County projects.

 Investment

Is an ADU Worth It?

ROI analysis, rental income projections, and property value impact.
View all guides

2026 Whatcom County ADU Laws

Everything you need to know about the new regulations and opportunities.

2025 Washington State ADU Law Changes (HB 1337)

Major statewide deregulation for easier building.

  • Right to Build: All Washington cities/counties must allow ADUs by right.
  • No Owner Occupancy: Owner-occupancy requirements eliminated statewide. You can rent both units.
  • Reduced Setbacks: Setbacks reduced to 5ft in many cases to fit more lots.
  • Impact Fees: Limitations on impact fees for ADUs under 1,000 sqft.

Meet Your Team

You don't get handed off. You get a team.

Loren — Permitting Specialist

Loren

Permitting Specialist

"Loren lives inside Whatcom County permit systems. He manages every submission, follows up with county staff, and keeps your project moving through the approval pipeline without delays."

Carlos — Builder & Architect Liaison

Carlos

Builder & Architect Liaison

"Carlos coordinates your architectural drawings, structural engineering, and build execution. One point of contact from design through final inspection."

Frequently Asked Questions

Whatcom County

Visit Our Office

4338 King Ave, Bellingham, WA 98225 · Serving all of Whatcom County

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