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Service · GARAGE CONVERSION
Turn Your Garage into Legal Living Space.
Convert an attached or detached garage into a permitted ADU, in-law suite, studio or home office — usually faster and for far less than building new.
What's Included
What a Proper Garage Conversion Includes.
Garages were never built to be lived in. These are the upgrades that turn one into a comfortable, code-compliant space.
Slab & Moisture Correction
Garage slabs often slope toward the door and lack a vapor barrier. We level, seal and raise floors so the new room stays dry and warm.
Insulation & Energy Compliance
Insulated walls and ceilings, dual-pane windows and heat-pump heating that meet California's Title 24 energy code.
Garage Door Infill
We frame in the opening with a wall, window or glass door and match the exterior siding, so it reads as part of the house from the street.
Plumbing & Sewer Tie-In
Trenching or tying in drain lines for a kitchen and bathroom — often the largest single cost in a conversion, so we scope it before pricing.
Electrical Service Review
A new subpanel or service upgrade when needed, plus lighting, outlets, and the smoke and carbon monoxide alarms required for living space.
Permits Without Replacement Parking
We handle plans and permits. When a garage becomes an ADU, California does not allow the city to require you to replace the lost parking.
INVESTMENT LEVELS
Garage Conversion Cost in the Bay Area.
Typical 2026 ranges including design, permits and construction. Final pricing depends on slab condition, plumbing runs and finish level.
Bonus Room or Office
$45K–$90K
No kitchen, 200–400 sq ft
- Home office, gym or studio
- Insulation, drywall & flooring
- Door infill with new window
- Lighting & electrical
- 2–4 month timeline
Studio or 1-Bed ADU
$120K–$200K
Kitchen & bath, 250–450 sq ft
- Legal, rentable ADU
- Full kitchen & bathroom
- Separate exterior entry
- Plumbing & sewer tie-in
- 4–6 month timeline
Two-Car Premium ADU
$200K–$275K+
Full two-car garage, 400–600 sq ft
- One or two bedrooms
- Slab or foundation upgrades
- Laundry & heat-pump HVAC
- Premium finishes
- 5–8 month timeline
Recent Garage Conversions
A Look at What We Build.
HOW IT WORKS
Your Garage Conversion, Step by Step.
Because the structure already exists, most garage conversions move faster than new construction.
- Garage & utility inspectionWe check the slab, framing, ceiling height and the distance to sewer, water and electrical service.
- Layout & designWe plan the room or ADU layout, window and door placement, and how the old garage door opening will be finished.
- PermitsWe prepare and submit plans. Converting an existing structure is usually simpler to approve than building new.
- ConstructionSlab and moisture work, framing, insulation, plumbing, electrical, heating and cooling, then finishes.
- Final inspectionWe pass the final inspection so the space is legal, documented and ready to live in or rent.
What Affects Garage Conversion Cost
- Slab condition, slope and moisture correction
- Distance to the sewer line for a kitchen or bathroom
- Electrical panel capacity and service upgrades
- Garage door infill and matching the exterior finish
- Whether the space becomes a legal ADU or a non-ADU room
Where We Build
San JoseSanta ClaraSunnyvaleCupertinoPalo AltoMountain ViewLos AltosLos GatosSaratogaCampbellMilpitasFremontNewarkMenlo ParkAthertonEast Palo AltoRedwood CitySan CarlosSan MateoBurlingameMorgan Hill
Related Services
GARAGE CONVERSION FAQS
The Questions We Hear Most.
Expect roughly $45,000–$90,000 for a bonus room or office with no kitchen, $120,000–$200,000 for a studio or one-bedroom ADU, and $200,000 or more for a full two-car conversion with structural or slab work. Distance to the sewer line is usually the biggest variable.
Not when the garage becomes an ADU. California ADU law prohibits cities from requiring replacement parking when a garage, carport or covered parking structure is converted to an ADU. Converting to a non-ADU room, like an office, can be treated differently, so we confirm your city's rules first.
Yes, if it's permitted as an ADU. A permitted garage ADU can be rented long-term like any other ADU. Unpermitted conversions create insurance, safety and resale problems, and California has made many older unpermitted units easier to legalize — we can assess yours.
Most garage ADUs take 4–6 months total: about 1–2 months of design, 1–3 months for permits and 2–3 months of construction. A simple office or gym conversion can be finished in 2–4 months.
Most can, but a low ceiling, a cracked or steeply sloped slab, or a shared wall with the house that needs upgrading can add work. We inspect the structure, slab and utilities before quoting so there are no surprises mid-project.
A permitted conversion adds legal living space and, as an ADU, rental income potential — both of which buyers and appraisers weigh. An unpermitted conversion can have the opposite effect when you sell.
Yes. Many owners convert the rear portion into a studio or office and keep the front for storage. A partial conversion still needs permits once it becomes living space.
Not when it's done right. Leveling and insulating the floor, insulating walls and ceilings, adding windows and finishing the door infill to match the house make it read as a real room inside and out.
READY TO TAKE IT ON?
Ready to ConvertYour Garage?
Send us a few photos of your garage and tell us how you’d like to use it. We’ll tell you what’s realistic and what it will cost.
GET FREE ESTIMATE
Let's Discuss
Your Project Goals.
Ready to elevate your living space with reliable, premium Bay Area craftsmanship? Tell us about your property and select your target service on the right. Our expert team will review your ideas, answer your questions, and connect with you promptly to plan your free project evaluation.
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