A garage conversion in LA costs 40 to 190 thousand dollars. Basic studio: 40 to 70K. Full ADU with kitchen and bath: 100 to 190K. Costs broken down by category below.
Foundation assessment and reinforcement (if needed), framing interior walls, replacing garage door opening with framed wall and window/door, ceiling joists upgrade for insulation weight. Older garages may need foundation thickening ($5K-$10K additional).
Kitchen: new water and drain lines from main house ($3K-$6K). Bathroom: toilet, shower/tub, sink connections ($4K-$8K). Water heater (tankless recommended for small spaces): $2K-$4K. Sewer connection: tie into existing house lateral ($1K-$3K).
New sub-panel (60-100 amp): $1.5K-$3K. Circuits for kitchen appliances, HVAC, bathroom, and general outlets: $1.5K-$3K. Lighting (recessed LED): $1K-$2K. Smoke/CO detectors per code. All new wiring — garage electrical is almost never sufficient for habitable space.
Mini-split (ductless) is the go-to for garage conversions: $3K-$6K for a single-zone unit that heats and cools. Ducted connection to main house HVAC: possible if system has capacity, $2K-$5K for ductwork. Standalone is simpler and avoids loading your existing system.
Insulation + drywall: $5K-$10K. Flooring (LVP or tile): $3K-$6K. Kitchen cabinets + counters: $5K-$15K (standard to mid-range). Bathroom tile + fixtures: $4K-$10K. Paint: $1K-$2K. Doors and trim: $1K-$3K. Range depends heavily on finish level.
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NP Line Design (CSLB #1105249). April 2026.
“The wide range of garage conversion cost quotes homeowners get in LA — sometimes $60,000, sometimes $180,000 for a similar-looking project — is almost always explained by what is included and excluded in the scope. The low bids typically exclude HVAC, permit fees, design fees, utility upgrades, and the foundation or floor assessment that are often necessary. The high bids include everything properly. I have never seen a quality, code-compliant, livable garage conversion in LA complete for under $80,000 for a single-car garage. If you are seeing bids significantly below that, ask for a specific scope breakdown.”
To get apples-to-apples bids for a garage conversion in LA, provide every contractor the same scope specification sheet listing: square footage, bathroom and kitchen scope, finish levels (select specific product lines or allowance amounts), HVAC type, permit responsibility, and utility coordination requirements. Without this, you will get wildly different bids that are impossible to compare. I have seen three bids on the same project come in at $85,000, $130,000, and $195,000 — and all three were 'correct' given the different scopes each contractor assumed.
1. Accepting a lump-sum bid for a garage conversion without a line-item breakdown by trade and scope, making it impossible to comparison shop or identify what is excluded
2. Not budgeting for the utility upgrade — ADU garage conversions require a separate utility meter in most LA jurisdictions, which involves LADWP and Southern California Gas coordination, adding $5,000 to $15,000 to the project
3. Skipping the structural assessment of the garage concrete slab — many LA garages were poured without adequate steel reinforcement for habitable use, and the assessment that confirms slab adequacy costs $500 to $1,500 but can prevent a $20,000 floor remediation mid-project
A contractor who quotes a garage conversion at a very low price point and offers to 'work around the permit process' is offering you a future liability disguised as cost savings. In LA's active real estate market, unpermitted garage conversions are flagged by county assessors, require disclosure on sale, and can be required by buyers' lenders to be demolished or brought to code. The savings from skipping permits are consumed many times over by the disclosure discount and remediation cost at sale.
A typical two-car garage ADU conversion in LA breaks down as: Design and permits $15,000 to $25,000; Foundation/slab assessment and any floor work $5,000 to $15,000; Framing and sheathing $8,000 to $15,000; Insulation $3,000 to $6,000; Electrical (rough and trim) $8,000 to $15,000; Plumbing (rough and trim) $10,000 to $20,000; HVAC $6,000 to $12,000; Drywall and paint $6,000 to $12,000; Flooring $5,000 to $12,000; Kitchen and bathroom $20,000 to $50,000. Total: $86,000 to $182,000.
Single-car garage (approximately 250 square feet): $80,000 to $130,000 all-in. Two-car garage (approximately 400 to 500 square feet): $120,000 to $200,000 all-in. Three-car garage (600+ square feet): $160,000 to $280,000 all-in. Cost per square foot decreases slightly with size because fixed costs (permits, design, utility connection) are spread over more square footage, but the relationship is not linear because bathroom and kitchen costs are fixed regardless of total square footage.
The most commonly underbudgeted items are: separate utility meter installation ($5,000 to $15,000), structural assessment and any slab reinforcement ($2,000 to $20,000), exterior finish matching the main house ($3,000 to $8,000), landscaping to accommodate the new unit's entrance and outdoor space ($5,000 to $15,000), and the window cost if the garage had minimal glazing ($3,000 to $8,000 for code-compliant natural light requirements).
Owner-builder permits are available in LA, but they require the owner to be the general contractor of record, which means coordinating all licensed subcontractors, managing inspections, and carrying the legal liability for code compliance. Owner-builders can reduce cost by 15 to 25 percent but must be significantly more involved in daily construction management. The trades (electrical, plumbing, HVAC) must be licensed regardless of owner-builder status.