Quick answer: A garage conversion ADU costs $80,000–$200,000 in Los Angeles, depending on the size of the garage and the finish level, and takes about 12–20 weeks in total, 6–12 of them on site. State law means you do not have to replace the lost parking, and a garage converted in place needs no new setback. In the City of LA, LADBS sets the building standards the garage must meet. APLA Construction (CA Lic #1136359) provides free estimates across Greater Los Angeles.
Converting a garage into an ADU (Accessory Dwelling Unit) is the fastest and most cost-effective way to add livable square footage and rental income to your Los Angeles property. With California’s ADU-friendly laws and LA’s sky-high rental demand, a garage conversion ADU can pay for itself in just a few years. APLA Construction is a licensed general contractor (CA Lic #1136359) that has completed garage conversion ADUs across Sherman Oaks, Encino, Culver City, Pasadena, Torrance, and throughout Greater Los Angeles.
A garage conversion ADU transforms an existing attached or detached garage into a fully permitted, self-contained living unit. It includes its own kitchen or kitchenette, bathroom, sleeping area, and private entrance. Under California law, a converted garage counts as an ADU and is subject to the same streamlined permitting protections that apply to all ADUs statewide, as detailed in the California HCD ADU Handbook.
Unlike a new detached ADU built from the ground up, a garage conversion uses your existing structure – foundation, walls, and roof are already in place – which significantly reduces cost and construction time.
A garage conversion ADU in Los Angeles typically costs $80,000 to $160,000 for a standard single-car or two-car garage conversion. Here is how that breaks down:
| Conversion Size | Typical Cost |
| Single-car garage conversion (200–250 sq ft) | $80,000–$110,000 |
| Two-car garage conversion (400–500 sq ft) | $110,000–$160,000 |
| High-finish or larger garage conversion | $160,000–$200,000 |
APLA’s range for a garage conversion ADU is $80,000–$200,000. Where a project lands depends mostly on how far the new bathroom sits from the existing sewer line, whether the slab and footings can stay (see the LADBS standards below), and the finish level. APLA provides detailed, itemized written estimates so you know exactly what you are paying for before any work begins.
All garage conversion ADUs in Los Angeles require permits. The process involves:
APLA visits your property to assess the existing garage structure, lot setbacks, utility connections, and zoning. We identify any site-specific issues before you spend a dollar on drawings.
We coordinate with a licensed architect or designer to prepare permit-ready drawings. Plans must show floor plan, elevations, electrical, plumbing, and mechanical layouts.
Plans are submitted to LADBS (for City of LA properties) or to the relevant city building department (Glendale, Burbank, Pasadena, Culver City, etc.). State law gives the city 15 business days to tell you whether the application is complete and, when there is already a house on the lot, 60 days from a complete application to approve or deny it (Gov. Code § 66317). If the garage was permitted, LADBS asks for its Certificate of Occupancy and earlier permits at plan check to confirm its permitted use.
Before LADBS issues the permit, other City departments sign off through “clearances” that plan check generates. The common ones for an ADU are a sewer-availability clearance from the Bureau of Engineering, hydrant and access approval from the Fire Department, a City Planning zoning clearance, and LADWP approval when the garage sits in or within 10 feet of a public utility easement (LADBS Information Bulletin P/BC 2026-150). Clearances depend on the parcel, so not every project gets all of them.
Once permits are in hand, a garage conversion ADU takes 6–12 weeks of on-site construction. APLA runs every trade under one contract and self-performs the electrical, HVAC, paint, flooring and cabinet work.
After final inspections pass, the city issues a Certificate of Occupancy. Your ADU is now legally habitable and rentable.
In the City of Los Angeles, a garage conversion is permitted under LADBS Information Bulletin P/BC 2026-150 (revised August 13, 2026), which sets the minimum building standards for converting an existing structure into an ADU. The table summarizes the items that drive the scope of most garage conversions:
| Item | What LADBS requires |
|---|---|
| Garage door opening | Infill with 2×4 studs at 16 inches on center maximum. The existing garage door header may stay. |
| Foundation | Existing footings may stay if they are in good condition and meet the minimum dimensions of the 2025 California Residential Code. New footings must be 24 inches deep at exterior walls. |
| Slab | The existing slab may stay with an approved sealant as a moisture barrier. |
| Entry door | Side-hinged, at least 3 feet wide and 6 feet 8 inches high. |
| Bedroom window | An emergency escape opening in every sleeping room: at least 5.7 sq ft openable, 24 inches high, 20 inches wide, sill no higher than 44 inches. |
| Walls near the property line | Without fire sprinklers, an exterior wall less than 5 feet from the property line must be 1-hour fire rated, which 5/8-inch Type X drywall on the inside face achieves. |
| Room size and ceiling | Habitable rooms at least 70 sq ft and 7 feet in any direction, with a 7-foot ceiling throughout. |
| Kitchen and bathroom | At least a sink, cooktop and refrigerator, plus a separate bathroom with toilet, sink and tub or shower. |
| Heating | Permanent heat that holds 68°F. Portable heaters do not count. |
| Utilities | Its own electrical panel and an accessible water shut-off valve inside the unit. A detached ADU can share the existing sewer line if that line meets the current plumbing code. |
| Energy | New work must meet Title 24 energy standards, shown on a CF1R form attached to the plans. No HERS field verification is required. |
Fire sprinklers are required only if the main house already has them, or if remodeling done at the same time triggers them. Two of these items move the budget the most: whether the existing footings and slab can stay, and whether a wall close to the property line needs fire rating. APLA checks both at the first site visit, before any drawings are paid for.
Yes, either by converting it or by tearing it down and building an ADU in its place. California law protects both routes:
This is a major advantage for older Los Angeles properties where the garage is close to the property line. See the California HCD ADU Handbook for the full statewide framework.
Parking. When a garage, carport or covered parking structure is converted to an ADU, or demolished to build one, the city cannot require you to replace those parking spaces (Gov. Code § 66314(d)(11)). The ADU itself needs no parking either, because it sits inside an existing accessory structure (§ 66322(a)(3)). This applies anywhere in California, near transit or not. More detail is in our ADU parking requirements guide.
Fees. No impact fees can be charged on an ADU of 750 sq ft of interior livable space or less, and an ADU under 500 sq ft is treated as not adding assessable space for school fees (Gov. Code § 66311.5(c)). A garage converted on the state’s guaranteed path also cannot be made to install a new or separate utility connection, or pay a connection fee or capacity charge, unless it is built together with a new house (§ 66311.5(d)). Most one- and two-car garages fall under both size lines. Plan-check and permit fees still apply.
Rental rates for ADUs in Los Angeles vary by neighborhood and unit size:
At $1,800/month, a $130,000 garage conversion ADU pays for itself in approximately 6 years – before any appreciation in property value is considered. In high-demand neighborhoods like Santa Monica, Culver City, Studio City, or Manhattan Beach, rents and property value gains are even stronger.
Not sure which is right for your LA property? See our ADU vs Room Addition comparison guide.
A garage conversion is constrained by the footprint you already have, so the first thing to check is how big a converted garage ADU can be under current setback and lot-coverage rules. If the structure is too far gone to convert, clearing it and building new is the alternative — demolition cost for clearing an existing garage sits at the low end of the range for a straightforward slab-and-frame removal. On the finance side, how Proposition 13 treats a new ADU matters more than most owners expect: only the new unit is reassessed, not the whole property.
No. When a garage, carport or covered parking structure is converted to an ADU or demolished to build one, California law bars the city from requiring replacement parking (Gov. Code § 66314(d)(11)). The rule applies anywhere in the state, not only near transit, and the converted ADU needs no parking of its own (§ 66322(a)(3)).
Yes. Detached garage conversions are actually simpler in some ways – there is no shared wall with the main house to navigate, and the unit can feel more private for tenants. APLA builds both attached and detached garage conversion ADUs throughout LA.
About 12–20 weeks in total for an APLA garage conversion ADU, of which 6–12 weeks are on-site construction. Permit approval currently takes 1–2 months. LADBS cannot issue the Certificate of Occupancy until the final inspection passes and every department clearance is signed off.
Under Proposition 13, only the newly constructed ADU is reassessed – not your existing home. Your base home’s assessed value stays the same. The ADU adds a relatively small amount to your annual property tax bill. Some ADUs completed as long-term rentals may also qualify for a temporary state property-tax exclusion under recent legislation — confirm current eligibility with the LA County Assessor’s office.
Yes. California law allows one ADU and one JADU (Junior ADU, up to 500 sq ft within the existing home) on a single-family lot simultaneously. APLA can help you plan both if you want to maximize rental income on your property.
State law counts an efficiency unit as an ADU (Gov. Code § 66313(a)(1)), so a small studio qualifies. In the City of LA, the practical limits come from LADBS: every habitable room must be at least 70 sq ft and 7 feet in any direction, ceilings at least 7 feet, plus a separate bathroom and permanent cooking facilities. Most single-car garages are 200–250 sq ft, enough for a studio ADU with a kitchenette, bathroom and sleeping area.
Yes. Turning a garage into living space needs a building permit, and in the City of LA, LADBS reviews it against Information Bulletin P/BC 2026-150 and issues a Certificate of Occupancy after final inspection. Converting a garage that has already been lived in without permits is a different route: see our guide to legalizing an unpermitted ADU under AB 2533.
Yes, if you want extra living space for the household rather than a separate rental unit with its own kitchen. It still needs a permit, but the rules and costs differ from an ADU, as covered in our garage conversion to bedroom guide.
APLA Construction builds fully permitted garage conversion ADUs throughout Greater Los Angeles. We handle everything from design coordination and permits through final inspection and certificate of occupancy.
Call: (818) 818-4419
Email: info@aplaconstruction.com
CA General Contractor License #1136359
Contact us for a free site evaluation and estimate. Learn more about all our ADU construction services.
Converting a garage outside LA County? APLA is licensed statewide (CA Lic #1136359) and also builds in Ventura County — Thousand Oaks, Simi Valley, Camarillo, Oxnard — and Orange County — Irvine, Anaheim, Huntington Beach, Newport Beach. The entitlement rules are state law and travel with you; what changes is which building department reviews the plans.
Wondering what the utilities cost? Utility connections are the most under-budgeted part of an ADU project, and the rules differ sharply between a conversion and a new detached build — including whether a separate connection can be required at all. See ADU utility connections in Los Angeles: costs, fees and the rules.