Des Moines, WA · DADU
DETACHED ADU Builder in Des Moines, WA
A detached accessory dwelling unit (DADU) is a fully independent residence on your existing single-family lot. We design and build DADUs that meet rental code, hold long-term value, and look like they belong — not like a kit dropped in the yard. Every project starts with a feasibility study and ends with a turn-key handover.
Build timeline
6–8 months
Typical sqft
400–1,000 sqft
Des Moines cost
$296K – $478K
Permit window
10–14 wk
What detached adu looks like in Des Moines
DETACHED ADU projects in Des Moines are shaped by local zoning (RS-9,600 / RS-12,000), a lot minimum of 7,200 sqft, and the kinds of sites we see day-to-day: Marina District, Woodmont, North Hill. Below is what every Des Moines DADU project from Golden State includes — fixed-price, one contract, one warranty.
- ✓Stamped architectural set
- ✓Structural + MEP engineering
- ✓Permit submittal & city liaison
- ✓Foundation, framing, weather envelope
- ✓Finish carpentry, cabinetry, fixtures
- ✓Final inspection + warranty package
Other services in Des Moines
More from Golden State ADU in Des Moines
AADU
ATTACHED ADU in Des Moines
Seamlessly integrated additions — basement, ground-floor, or wing conversions that maintain the architectural integrity of your existing home.
Garage
GARAGE CONV. in Des Moines
Convert an under-used garage into a high-end studio, office, or rental quarter without surrendering your driveway.
Additions
MODERN ADDITIONS in Des Moines
Structural expansions for growing families — second stories, primary suites, kitchen extensions. Steel, glass, and Pacific Northwest materials.
GC
GENERAL CONTRACTING in Des Moines
Full-service general contracting for remodels, renovations, and ground-up custom homes throughout the Puget Sound region.
Feasibility
FEASIBILITY STUDIES in Des Moines
Before you commit, we analyze zoning, lot coverage, setbacks, utilities, and ROI so you have a real number — not a guess.
DETACHED ADU across the Puget Sound
DETACHED ADU builders in nearby cities
Start your Des Moines DADU feasibility
$1,500 buys lot analysis, Des Moines zoning verification, and a fixed price you can build a budget on.
Request Des Moines feasibilityFrequently asked
What is included in DETACHED ADU in Des Moines?
Our DETACHED ADU in Des Moines scope includes design through completion: feasibility, schematic design, construction documents, permit submittal and review management, construction with one self-performed framing crew plus L&I-licensed MEP subcontractors, all required WA inspections, certificate of occupancy, and warranty. One contract, one license number, one warranty — not a coordination headache across five vendors.
How is DETACHED ADU in Des Moines different from a generic remodel?
DETACHED ADU in Des Moines carries code, permit, and construction details that a one-off remodeler hasn't repeated enough times to optimize. Examples: IECC R406 envelope path selection, fire separation when units are within 5 ft, side-sewer slope requirements, IRC Appendix AQ when permitted as a tiny house, separate utility metering rules. We do this scope every month — repetition is what makes our first-cycle approval rate and our schedule reliability stand out.
What is the typical price range for DETACHED ADU in Des Moines?
DETACHED ADU in Des Moines pricing in 2026 lands in the $295–$465/sqft all-in range depending on size, lot conditions, finish tier, and AHJ. The wide range is real — small lots with difficult access, soils requiring pier-and-beam, or service upgrades push the upper end; flat lots with good access and a catalog plan land at the lower end. Our feasibility report gives you a ±15% number tailored to your specific lot in two weeks.