ADU Construction — Clark County, WA
A Real Space for Your Family. Built Right.
ADU construction, ADU permits, and full builds across Clark County, Cowlitz County, and the Portland metro.
Most ADUs in Clark County cost between $90,000 and $250,000 depending on size, finishes, and site conditions. A typical permitted ADU takes 6 to 10 months from design to move-in. We handle the full process: design coordination, permit applications, site work, and the complete build.
What Is an ADU?
An accessory dwelling unit is a second, self-contained home on your existing property. It can be attached to your main house, built above a garage, or constructed as a separate freestanding structure in your backyard.
Most of our ADU clients in Clark County are building for one of three reasons: housing an aging parent or in-law, generating rental income, or adding long-term property value. All three are solid reasons to build.
ADUs require permits and must meet Washington State building codes and your county's zoning requirements. We handle all of that on your behalf.
Types of ADUs We Build
Detached ADU
A freestanding structure separate from the main house. Most private option for parents or renters. Works on lots with enough setback clearance.
Attached ADU
An addition built onto the side or back of your existing home. Shares a wall, separate entrance. Often the most cost-effective option.
Garage Conversion ADU
Your existing detached garage converted into a permitted, livable unit. Good option when lot coverage limits new construction.
Above-Garage ADU
Living space built above a garage. Keeps ground-level square footage open. Popular in neighborhoods with smaller lots.
How Our ADU Process Works
Free Consultation
Tell us what you're building and where. We'll come out, look at the site, and give you a straight answer on what it costs and how long it takes.
Design + Permit Coordination
We coordinate your design drawings and handle the permit application through Clark County or the applicable jurisdiction. We know what gets approved.
Site Prep + Foundation
We handle grading, utility connections, and foundation work before the build starts. No surprises underground.
The Build
Framing, electrical, plumbing, insulation, drywall, finishes. Our crew is on-site and on schedule. We do not subcontract out the management of your job.
Inspections + Final Walkthrough
We manage all required inspections. We walk the finished project with you before closing out. You sign off when everything is right.
Frequently Asked Questions
Most ADUs in Clark County run between $90,000 and $250,000 depending on size, site conditions, and finish level. Detached ADUs with full utilities on the higher end. We give you a real number after the site visit — not a range we padded to protect ourselves.
Yes. All ADUs in Clark County require a building permit and must meet Washington State residential building code plus local zoning rules. We handle the permit process start to finish.
A typical ADU in Clark County takes 6 to 10 months from design completion to move-in, depending on permit timeline and scope. We give you a real schedule before we start and keep you updated throughout the build.
Most single-family lots in Clark County are eligible for at least one ADU. Lot size, setbacks, and existing structures affect what type you can build. We will tell you exactly what is possible during the free consultation.
Yes. A permitted ADU is a legal rentable dwelling. Many of our Clark County clients use their ADU for rental income to offset their mortgage or supplement retirement.
Yes. We serve Clark County, Cowlitz County, Multnomah County, and Clackamas County. We know the permit requirements and zoning rules in each jurisdiction.
Real Reviews. Real Projects.
Ready to Build Your ADU?
We work with Clark County homeowners from first conversation through final walkthrough. Get a straight answer on what it costs and how long it takes.