Cost · 11 min read · May 30, 2026 · 421 words
Los Angeles garage conversion cost in 2026: the honest 400 sq ft number
What a 400 sq ft LA garage-to-ADU conversion really costs in 2026 — every line item, the upgrades that drive overruns, and how the number compares to a new detached build in [your neighborhood](/adu).
Key takeaways
- Design + Title 24 + structural — $11K–$16K. See the [Title 24 guide](/guides/title-24-energy-compliance-adu).
- City plan check + permit + school fees (waived <500 sq ft) — $5K–$9K.
- Demolition, slab repair, new footing if needed — $6K–$12K.
Answered in this guide
Jump straight to the question you came in with — every answer is on this page, with links onward to the deeper guide.
- What kind of return on investment can I expect?
- Are there grants or rebates available?
- What does an ADU cost in LA?
- What's included in your turnkey number?
- How long does an ADU project take in Los Angeles?
- What is the typical week-by-week breakdown?
More across the studio · the full FAQ map · the reference desk
A 400 sq ft detached garage conversion is the most-asked-about Los Angeles ADU product of 2026. The honest all-in number — soft costs, hard costs, utility upgrades, fees and a real contingency — lands at $145,000–$195,000 for a permit-clean garage on a flat lot. Anything under $130K either skips legalization steps or hides scope you will pay for later. This guide breaks the number down line by line, then maps it back to the LA cost anatomy and the ROI calculator so you can stress-test your own quote.
What is actually inside a $165,000 garage conversion
- Design + Title 24 + structural — $11K–$16K. See the Title 24 guide.
- City plan check + permit + school fees (waived <500 sq ft) — $5K–$9K.
- Demolition, slab repair, new footing if needed — $6K–$12K.
- Framing, exterior cladding, roof tie-in — $24K–$34K.
- MEP rough-in (panel sub-feed, plumbing, HVAC mini-split) — $22K–$30K.
- Insulation, drywall, paint, finishes, kitchen, bath — $48K–$66K.
- Site work, drainage, hardscape — $6K–$11K.
- Contingency at 10–12% — $14K–$19K.
Where the budget actually breaks
Three line items create most overruns on LA garage conversions. First: the existing slab. Pre-1970 garage slabs were poured 3–4 inches thick over uncompacted fill — habitable space requires a 4-inch slab on properly compacted base with vapor barrier and continuous footings. Second: panel capacity. A 100A main panel almost always needs a 200A upgrade to feed the ADU sub-panel, and LADWP lead times can extend a project 6–12 weeks. Third: sewer lateral. Camera the line in feasibility; replacing a collapsed clay lateral adds $8K–$18K.
How LA compares to neighbors
Compared with the broader region, an LA City garage conversion is $20K–$45K cheaper than the same product in a hillside Beverly Hills lot, $10K–$25K cheaper than a Santa Monica coastal-zone parcel, and roughly on par with Long Beach and Burbank. The Bay Area cost anatomy explains why the same conversion runs $215K–$255K north of San Jose.
Anchor links and further reading
- Compare full LA cost stack: LA ADU cost anatomy
- Permit timeline week by week: LA permit timeline
- Detached vs attached vs conversion: product comparison
- Run the math on your lot: ROI calculator · cost breakdown
Sources
- LADBS ADU information · LA Department of Building & Safety
- California ADU Handbook 2025 · California HCD
Next chapter · 01 of 02
Cost · 9 min read
The anatomy of an LA ADU build, line by line
Once you have the conversion number, the LA cost anatomy puts it in context against the full detached build.
Where every dollar of a $325,000 detached 800 sq ft ADU actually goes — soft costs, hard costs, contingencies, and the line items that surprise homeowners most.
FAQ · Cost
Common questions on cost
The questions readers send us most after this guide.
What kind of return on investment can I expect?
Across 120+ completed LA projects, our owners see 10–16% annual return on construction cost in long-term rental. The math: a $280K detached ADU renting at $2,800/month grosses $33,600/year — roughly a 12% gross yield before expenses. Property value uplift is typically 1.4–1.7× the build cost on appraisal.Are there grants or rebates available?
The CalHFA ADU Grant Program ($40K toward soft costs) was paused in 2023 but a successor is in late-stage legislative drafting. LADWP offers rebates for high-efficiency HVAC and induction cooktops. We track every active program and apply on your behalf.What does an ADU cost in LA?
Pricing depends on size, finish level, and site conditions. For 2026, our detached ADUs start around $250K for a 480 sq ft studio and run up to about $480K for a 1,200 sq ft custom build. Garage conversions begin around $145K. JADUs typically run $95K–$140K.What's included in your turnkey number?
Architectural and structural design, Title 24 energy compliance, full permit fees and plan check, soils report when required, foundation, framing, MEP rough-in, insulation, drywall, doors, windows, kitchen, bathroom, flooring, paint, fixtures, and final cleaning. Excluded: landscaping beyond grading, solar (offered separately), and LADWP service upgrades when the existing panel can't carry the load.How long does an ADU project take in Los Angeles?
Most detached ADUs run 9–13 months from contract to certificate of occupancy. Garage conversions are typically 4–6 months. Permitting alone is usually 60–120 days at LADBS depending on whether we use a pre-approved standard plan or a custom design that needs full plan check.What is the typical week-by-week breakdown?
Weeks 1–3: feasibility, survey, schematic design. Weeks 4–8: construction documents and Title 24. Weeks 9–20: plan check at LADBS or your local department. Weeks 21–24: site mobilization and foundation. Weeks 25–40: framing, MEP rough-in, drywall, finishes, and inspections. Final two weeks are punch list and closeout.
Reference desk · Cost
More answers from the California reference desk
City-specific questions pulled from our 5,000-answer FAQ corpus — every link opens a deeper desk page.
What does a ADU cost in Beverly Hills in 2026?
In Beverly Hills, a turnkey ADU typically starts around $165K and runs $360–$400 per square foot installed, depending on size, finish tier, and site conditions. Permit and impact fees layer $28K–$42K on top of construction, and City of Beverly Hills Community Development runs plan check 120–180 days on a clean submittal.What are the actual permit and impact fees for a ADU in Beverly Hills?
For a permitted construction scope in Beverly Hills, the City of Beverly Hills Community Development fee stack typically lands $28K–$42K all-in: plan check, building permit, school impact (when triggered), sewer capacity, and energy compliance review. The single biggest variable is utility capacity — LADWP service upgrades common on pre-1970 panels — budget 8–12 wks.What is the per-square-foot price for a ADU in Beverly Hills?
Honest 2026 pricing for a ADU in Beverly Hills runs $360–$400 installed. Smaller footprints carry a higher $/sqft because fixed costs (kitchen, bath, utility tie-ins) spread over fewer feet. Bids that come in 20% under this band almost always exclude site work, Title 24, or impact fees — ask for a line-item breakdown before you compare.How can I make a ADU in Beverly Hills cheaper without compromising quality?
Four levers actually move the number in Beverly Hills: (1) use pre-approved standard plans where the jurisdiction publishes them — cuts plan check 30–45 days and trims design fees; (2) keep the footprint rectangular — every jog adds $3K–$6K of framing and roof complexity; (3) specify workhorse-tier finishes (LG STUDIO, Bosch 500, KraftMaid) instead of paid-name luxury — same daily UX at 35% lower spend; (4) sequence ladwp service upgrades common on pre-1970 panels — budget 8–12 wks early to avoid schedule penalties.What does a garage conversion cost in Beverly Hills in 2026?
In Beverly Hills, a turnkey garage conversion typically starts around $165K and runs $360–$400 per square foot installed, depending on size, finish tier, and site conditions. Permit and impact fees layer $28K–$42K on top of construction, and City of Beverly Hills Community Development runs plan check 120–180 days on a clean submittal.What are the actual permit and impact fees for a garage conversion in Beverly Hills?
For a permitted construction scope in Beverly Hills, the City of Beverly Hills Community Development fee stack typically lands $28K–$42K all-in: plan check, building permit, school impact (when triggered), sewer capacity, and energy compliance review. The single biggest variable is utility capacity — LADWP service upgrades common on pre-1970 panels — budget 8–12 wks.What is the per-square-foot price for a garage conversion in Beverly Hills?
Honest 2026 pricing for a garage conversion in Beverly Hills runs $360–$400 installed. Smaller footprints carry a higher $/sqft because fixed costs (kitchen, bath, utility tie-ins) spread over fewer feet. Bids that come in 20% under this band almost always exclude site work, Title 24, or impact fees — ask for a line-item breakdown before you compare.How can I make a garage conversion in Beverly Hills cheaper without compromising quality?
Four levers actually move the number in Beverly Hills: (1) use pre-approved standard plans where the jurisdiction publishes them — cuts plan check 30–45 days and trims design fees; (2) keep the footprint rectangular — every jog adds $3K–$6K of framing and roof complexity; (3) specify workhorse-tier finishes (LG STUDIO, Bosch 500, KraftMaid) instead of paid-name luxury — same daily UX at 35% lower spend; (4) sequence ladwp service upgrades common on pre-1970 panels — budget 8–12 wks early to avoid schedule penalties.What does a JADU cost in Beverly Hills in 2026?
In Beverly Hills, a turnkey JADU typically starts around $165K and runs $360–$400 per square foot installed, depending on size, finish tier, and site conditions. Permit and impact fees layer $28K–$42K on top of construction, and City of Beverly Hills Community Development runs plan check 120–180 days on a clean submittal.What are the actual permit and impact fees for a JADU in Beverly Hills?
For a permitted construction scope in Beverly Hills, the City of Beverly Hills Community Development fee stack typically lands $28K–$42K all-in: plan check, building permit, school impact (when triggered), sewer capacity, and energy compliance review. The single biggest variable is utility capacity — LADWP service upgrades common on pre-1970 panels — budget 8–12 wks.
Sources & further reading
- California Government Code §65852.2 — statewide ADU framework (ministerial review, 60-day clock).
- LADBS — Accessory Dwelling Unit information bulletins and current permit fee schedule.
- HCD — California Department of Housing & Community Development, ADU handbook (2024 update).
- Internal data: 120++ ADU projects delivered across Los Angeles County, 2018–2025.
Continue your read · the editorial path
We chained these chapters in the order LA homeowners actually need them. Each one picks up where the last one left a question open.
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