Mercer Island, WA · Garage
GARAGE CONV. Builder in Mercer Island, WA
Garage conversions are the fastest path to an income-producing or family-flex space on a small lot. We address the issues every garage has — uninsulated slab, no vapor barrier, undersized electrical, single-pane glass — and deliver a quiet, dry, code-legal living space.
Build timeline
3–4 months
Typical sqft
200–600 sqft
Mercer Island cost
$165K – $268K
Permit window
12–16 wk
What garage conv. looks like in Mercer Island
GARAGE CONV. projects in Mercer Island are shaped by local zoning (R-8.4 / R-9.6 / R-12), a lot minimum of 8,400 sqft, and the kinds of sites we see day-to-day: North End, First Hill, Mid-Island. Below is what every Mercer Island Garage project from Golden State includes — fixed-price, one contract, one warranty.
- ✓Slab inspection + moisture mitigation
- ✓Wall & ceiling insulation upgrades
- ✓Window/door re-framing
- ✓Sub-panel + dedicated circuits
- ✓Mini-split HVAC system
- ✓Finish carpentry + paint
Other services in Mercer Island
More from Golden State ADU in Mercer Island
DADU
DETACHED ADU in Mercer Island
Stand-alone backyard cottages built from the ground up — engineered for rental income, multi-generational living, or your home office.
AADU
ATTACHED ADU in Mercer Island
Seamlessly integrated additions — basement, ground-floor, or wing conversions that maintain the architectural integrity of your existing home.
Additions
MODERN ADDITIONS in Mercer Island
Structural expansions for growing families — second stories, primary suites, kitchen extensions. Steel, glass, and Pacific Northwest materials.
GC
GENERAL CONTRACTING in Mercer Island
Full-service general contracting for remodels, renovations, and ground-up custom homes throughout the Puget Sound region.
Feasibility
FEASIBILITY STUDIES in Mercer Island
Before you commit, we analyze zoning, lot coverage, setbacks, utilities, and ROI so you have a real number — not a guess.
GARAGE CONV. across the Puget Sound
GARAGE CONV. builders in nearby cities
Start your Mercer Island Garage feasibility
$1,500 buys lot analysis, Mercer Island zoning verification, and a fixed price you can build a budget on.
Request Mercer Island feasibilityFrequently asked
What is included in GARAGE CONV. in Mercer Island?
Our GARAGE CONV. in Mercer Island 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 GARAGE CONV. in Mercer Island different from a generic remodel?
GARAGE CONV. in Mercer Island 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 GARAGE CONV. in Mercer Island?
GARAGE CONV. in Mercer Island 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.