Design inspirationGarage to ADU Conversion
Garage conversion contractors serving Greater Los Angeles — design, permits and construction under one contract.
Convert your garage to an ADU across Greater Los Angeles
Quick answer: A garage-to-ADU conversion turns an existing garage into a separate dwelling with cooking, bathroom and living facilities. HomeAdd coordinates feasibility, design, permits and construction across Los Angeles County and southern Ventura County. Existing planning prices start at $85K; your structure, utilities, jurisdiction and finishes determine the written proposal after design.
A garage conversion is often the most direct way to add a permitted ADU across Greater Los Angeles. Reusing the existing foundation, walls and roof usually means less new structure than a detached build; the schedule depends on plan check, site conditions and scope.
HomeAdd converts 2-car and 3-car garages into studios, 1-bedrooms, and 2-bedroom ADUs. Every conversion includes new insulation, drywall, plumbing, kitchen, bath, HVAC, flooring, and a proper exterior door. Every scope is designed to current code and confirmed in plan check.
California ADU law generally prevents cities and counties from requiring replacement parking when a garage is converted into an ADU. We confirm the rules for your specific address during feasibility.
Garage to ADU vs. garage to bedroom or office
An ADU is a separate dwelling with its own kitchen and bathroom. A bedroom or office conversion instead adds space to the main home and follows the applicable building and zoning requirements for that use; ADU-specific parking and setback provisions should not be assumed to apply. Decide which use you need before preparing plans.
2-car garage studio
The classic — 400 sq ft open-plan studio with full kitchen and bath.
2-car garage 1-bedroom
Separated bedroom, full bath, kitchen, living — the rental sweet spot at 400–450 sq ft.
3-car garage 1-bedroom
Larger footprint (600–700 sq ft) allows a real living room and separate bedroom.
3-car garage 2-bedroom
Family-scale ADU, size subject to local limits and the existing footprint.
Partial garage conversion
Convert one bay to a JADU or office and keep the other bay as parking.
Garage conversion + expansion
Convert plus a small addition off the back of the garage — pushes the unit up to 1,000+ sq ft.
Garage conversion scope: design, permits and construction
Every phase, in order.
- 1Feasibility & design
Site walk, structural assessment, design.
- 2Permit set
Engineering (where needed), Title 24, drawings.
- 3Plan check & permits
Plan-check submittal, corrections, and permit issuance.
- 4Demo & foundation prep
Remove garage door, level slab, moisture barrier, footings for new walls.
- 5Framing & envelope
New windows/doors framed, exterior finishes updated.
- 6MEP & insulation
Rough electrical, plumbing, HVAC, insulation, drywall.
- 7Kitchen, bath, finishes
Cabinetry, tile, flooring, paint, fixtures, appliances.
- 8Final inspection & handoff
Building final, address assignment, punch list, warranty.
Garage conversion starting-price planning ranges
Preliminary planning ranges vary by jurisdiction, site conditions, design, utilities, and finish level. A written proposal follows feasibility and design.
Open-plan 400 sq ft studio with full kitchen and bath, standard finishes.
Separated bedroom, mid-range finishes, dedicated mini-split.
Larger footprint (600–800 sq ft) with upgraded finishes.
Filed, corrected, inspected — by us.
We prepare and submit the permit package to the department that reviews your address, whether that is LADBS, LA County, Ventura County, or a city building department in Los Angeles or Ventura County. You never touch a portal, sit on hold, or drive to a counter.
- ADU permit and local plan check
- Structural plan check (as needed)
- Title 24 energy compliance
- Plumbing, electrical, mechanical permits
- Foundation / slab work permit
- Egress window compliance
- Address assignment
- Final building inspection & CofO
Garage conversion permits in Los Angeles and Ventura County
A garage conversion is reviewed by whoever has building authority over your address, not by a single regional office. California sets the statewide ADU baseline, and each city or county applies it through its own plan check, fees and inspections.
First confirm the address and intended use, then evaluate the existing garage and prepare design, engineering and energy documents as required. Submit to the reviewing agency, respond to plan-check corrections, obtain permits, and complete construction inspections and final sign-off. The documents and review path vary by jurisdiction and site conditions; this is orientation, not legal advice.
- LADBS (Los Angeles Department of Building and Safety) ↗
Plan check, building permits and inspections for addresses inside the City of Los Angeles.
- Los Angeles City Planning ↗
Zoning, specific plans and hillside or overlay rules for City of LA parcels.
- LA County Public Works, Building and Safety ↗
Building permits for unincorporated Los Angeles County. Other LA County cities, such as Burbank or Glendale, have their own building departments.
- Ventura County Resource Management Agency (RMA) ↗
Planning and building for unincorporated Ventura County. Thousand Oaks, Simi Valley and other cities run their own departments.
- California HCD ADU Handbook ↗
The state-level ADU rules every California city and county must follow at minimum.
- Comparing costs first? Read the garage conversion cost guide linked above.
Do you need replacement parking for a garage-to-ADU conversion?
No. Under Gov. Code §66314(d)(11), a local agency may not require replacement off-street parking when a garage, carport or covered parking structure is demolished with an ADU project or converted into an ADU. This rule does not turn every garage conversion into an ADU: a bedroom or office added to the main home is a different use. Confirm the intended use and the applicable permit path for your parcel.
The garage-to-ADU plans still need to address dwelling, structural, energy and fire-safety requirements. Review the existing slab, walls, roof and utility connections before committing to a layout; no general parking rule guarantees approval for a specific property.
California HCD ADU Handbook (March 2026)What this scope typically looks like.
Representative planning images of the kind of build described above.
Questions homeowners ask first.
Still have questions? Call (877) 544-1543 or request a callback — a HomeAdd project advisor will walk your address on Google Earth with you on the phone.
Is a garage conversion usually the lowest-cost ADU option?+
Often, because the slab, walls and roof already exist. The real cost depends on the slab condition, utility runs, required structural or energy upgrades and finishes, so we confirm it in feasibility and give a written proposal after design. See the garage conversion cost guide for planning ranges.
Will I have to replace the parking I lose?+
When a garage is converted into an ADU, local agencies may not require replacement off-street parking for the spaces lost (Gov. Code §66314(d)(11)). A bedroom or office conversion is a different use, so confirm the project type and applicable requirements with the reviewing agency.
Who reviews the permit for my garage conversion?+
It depends on the address. City of Los Angeles addresses go to LADBS with zoning by LA City Planning; other cities use their own building departments; unincorporated areas use LA County Public Works or Ventura County RMA. We identify the right agency before design starts.
What if my garage slab is cracked or sits too low?+
We check the slab during feasibility. Minor cracks can often be repaired with a new moisture barrier. If the slab is damaged or too low for the floor-to-ceiling height and drainage the plans need, partial or full replacement is quoted as a separate line item.
How does a garage conversion compare with an above-garage ADU?+
A conversion is usually simpler and faster because it reuses the existing structure. An above-garage ADU keeps the parking but needs a structural evaluation and more new construction. We weigh both options for your lot during feasibility.
Garage to ADU Conversion by city.
Each page covers the reviewing department, local site conditions, and typical scopes for that city.
Los Angeles County
Other ADU options for your lot.
A standalone backyard home — up to 1,200 sq ft, its own address, real rental income.
New living space seamlessly bolted to your existing home — shared wall, separate life.
Stack a second-story unit over your garage — square footage without giving up yard.
Up to 500 sq ft carved inside your existing home — the simplest permit path.
Ready to plan your garage to ADU conversion?
We'll walk your property, pull the zoning, and give you a real budget and timeline — before you spend a dollar on design.