Free · Los Angeles · Updated 2026
Garage conversion
cost in LA.
Real 2026 numbers, not brochure fluff. Convert your existing garage into a legal ADU for roughly $95K–$195K all-in — 30–45% less than a detached build on the same lot. Here's what actually drives the number.
- Typical all-in
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$95–195K
All-in range
- Permit timeline
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6–10 wk
LADBS permit
- Parking required
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0
Replacement spaces
Licensed & bonded California contractors · LADBS plan-check experience
Live estimate
What's your scope?
Your estimated all-in cost
$0 – $0
- Hard cost (labor + materials)
- $0
- Permits + soft cost
- $0
- Contingency (8%)
- $0
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Why it's cheaper
The three reasons garage conversions
cost 30–45% less.
01
Foundation exists.
Your slab is already poured, the footings are already dug, the drainage is already solved. You're saving the largest single line item on a from-scratch ADU — $18–$28K on foundation alone.
02
Walls & roof exist.
You reuse three (often all four) existing walls, the roof structure, and the roof finish. Framing and roofing combined are another $22–$35K you don't spend on a conversion.
03
Permits faster.
LA requires no setback review, no parking replacement, and LADBS uses an expedited review track for garage-to-ADU conversions. 6–10 weeks to permit vs. 14–22 weeks for a detached build.
What's inside your number
Every line item on a real garage conversion.
This is the exact breakdown we'd build for a 400 sq ft 2-car conversion at mid-range finishes, attached garage, no panel upgrade. Your project will vary up or down based on scope.
Get real bids on your project →Sample: 400 sq ft 2-car conversion, attached, mid-range
Line-item breakdown
- Demo / cleanup
- $4,500
- Slab prep & moisture barrier
- $3,800
- Framing adjustments, new windows, door infill
- $11,000
- Insulation, drywall, paint
- $14,500
- HVAC (mini-split + ductless)
- $7,500
- Electrical (rough + finish)
- $12,000
- Plumbing (rough + fixtures)
- $14,000
- Kitchen (cabinets, counters, appliances)
- $18,000
- Bath (tile, fixtures, shower)
- $11,000
- Flooring (LVP throughout)
- $6,000
- Finish carpentry, trim, doors
- $5,500
- Exterior siding / paint touch-ups
- $4,200
- Permits & plan check (LADBS + school fees)
- $8,500
- Architectural + structural engineering
- $9,000
- Title 24 energy calcs + soils
- $2,200
- Contingency (8%)
- $10,500
- All-in total
- $142,200
Representative composite. Your project will vary with finish, utility upgrades, and site conditions.
Factors that swing your cost
Six things that change your final number.
01
Garage size.
A 1-car (240 sq ft) conversion runs $95–140K. A 2-car (400–480 sq ft) runs $130–195K. A 3-car (600–700 sq ft) runs $160–240K. Cost-per-sq-ft actually drops as size increases because the fixed costs (kitchen, bath, electrical panel) are amortized across more space.
02
Attached vs detached.
Detached garage conversions add ~10–15% because you trench for utilities from the main house, install a separate mini-split system, and sometimes run a longer sewer line.
03
Bed count.
A studio conversion keeps the space open — one plumbing wall, minimal framing. Add a bedroom and partition walls, a closet, and often a second window for egress. Going from studio to 2-bed adds roughly 10–15%.
04
Finish level.
Basic (builder-grade laminate, stock cabinets, vinyl plank) vs. Luxury (quartz, custom cabinets, European tile, imported fixtures) swings the bottom line 20–25%. Mid-range is where 70% of our LA clients land.
05
Electrical panel.
Most LA homes are 100A service. An ADU typically requires 200A. Budget $3,500–$6,000 for a panel upgrade. Some projects can sub-panel and skip this — depends on your existing load.
06
Your city.
Permit fees, plan-check speed, and inspection rigor vary. LADBS (LA city) averages 8-week turnaround. Pasadena, Glendale, Burbank all vary. Our estimator uses LA County average — add ~$1–2K for stricter cities.
Timeline
From signed plans to keys in hand.
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Step 1
Weeks 1–4
Design & engineering
Architectural drawings, structural calcs, Title 24 energy report.
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Step 2
Weeks 5–14
LADBS plan check
Plan review, corrections cycle, permit issuance. 6–10 weeks typical.
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Step 3
Weeks 15–22
Construction
Demo, framing adjustments, MEP rough-in, drywall, finishes. 8–10 weeks for most 2-car conversions.
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Step 4
Weeks 23–24
Final inspection & CO
LADBS final inspection, Certificate of Occupancy issued, you hand over the keys.
Total: roughly 5–8 months from plans to move-in. Detached from-scratch ADUs typically run 9–14 months.
Recent builds
Garage conversions we've actually built.
Ready for real numbers?
A 15-minute walk through your garage.
Tell us about your garage and we'll send a senior ADU planner to your property for a free measure-and-plan walk-through. You'll leave the call with a real scope and a real number — no pressure to sign.
Or compare 3–5 bids first →Questions
Garage conversion questions we hear often.
Still have a question? Ask us during your free consultation.
How much does it cost to convert a garage into an ADU in Los Angeles?
For a standard 1-car garage (roughly 240 sq ft) at mid-range finishes, expect $95,000–$140,000 all-in — hard cost, permits, and contingency. A 2-car garage (roughly 400–480 sq ft) runs $130,000–$195,000. Our 60-second cost tool gives you a real range for your specific scope, lot, and finish level.
Why is garage conversion cheaper than a detached ADU?
You're reusing the foundation, roof, and (often) two or three existing walls. That cuts framing, concrete, and roofing — typically the three biggest hard-cost buckets on a from-scratch ADU. Net: a garage conversion lands 30–45% below a comparable detached ADU on the same lot.
Can I keep my washer/dryer or storage in the converted garage?
Kind of. California law requires the garage conversion to be a fully legal dwelling — which means you can't just leave raw-storage space or an open laundry nook. A compliant garage-conversion ADU typically includes a laundry closet with hookups for a stacked unit. We commonly relocate bulk storage to a new exterior shed or an attic platform so clients don't lose function.
Do I need to add a parking space if I convert my garage?
In Los Angeles: no. Under California state ADU law, when you convert an existing garage to an ADU you're NOT required to replace the parking — even if the garage was serving a covered-parking requirement. This is a big deal and one of the main reasons garage conversions are the fastest-permitting path.
How long does a garage conversion take — permit to move-in?
Typical LA timeline: 3–5 months for permit approval (6–10 weeks through LADBS on a straightforward project) plus 2–3 months of construction. So 5–8 months from signed plans to keys. Detached ADUs often run 9–14 months — the garage path is meaningfully faster.
Do I need to upgrade my home's electrical panel?
Maybe. Most LA homes have a 100-amp service panel. A garage-conversion ADU with a mini-split, electric cooktop, and washer/dryer adds roughly 30–50 amps of demand. Many clients need a panel upgrade to 200 amps (budget $3,500–$6,000). Our calculator includes a modest allowance in 'soft cost' for this.
What if my garage isn't attached to my house?
That's often ideal — a detached garage conversion is still much cheaper than a from-scratch detached ADU AND it gives the occupant full privacy. You will likely need to trench for a new utility connection from the house; we include that in the 'sloped/tight lot' multiplier on the cost calculator.
Stop guessing on cost
Turn your garage into a real number.
Free, no obligation, 3–5 comparable bids from vetted LA contractors on your exact garage-conversion scope.
