Quick Answer
Los Angeles ADUs: $150K–$350K
Permits: $5K–$15K · Updated April 2026
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Drag a slider to see 2026 all-in ADU costs for LA at every size from 200 to 1,400 sq ft — no form required.
Quick Cost Overview
| ADU Size | Budget Build | Mid-Range | Premium |
|---|---|---|---|
| Studio (400 sq ft) | $88,000 | $130,000 | $198,000 |
ADU Construction Cost Per Square Foot in Los Angeles (2026)
Garage Conversion
$150–$250
per sq ft
Attached ADU
$250–$350
per sq ft
Detached ADU
$300–$450
per sq ft
Prefab/Modular
$200–$300
per sq ft
These 2026 per-square-foot costs include materials, labor, and standard finishes. High-end finishes, hillside lots, and seismic upgrades can add 15–25%. LA's ADU Accelerator Program pre-approved plans can reduce design costs by $5,000–$15,000.
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2026 LA ADU Cost Per Square Foot
Los Angeles ADU costs in 2026 range from $250 to $525 per square foot depending on size, finish level, and neighborhood. Detached new-builds run higher than garage conversions, which typically finish at $150–$275 per square foot.
| Size | $/sq ft (range) | Median total |
|---|---|---|
| 400 sq ft JADU | $350–$525 | $175K |
| 600 sq ft 1BR | $300–$475 | $232K |
| 800 sq ft 1BR/2BR | $275–$450 | $290K |
| 1,000 sq ft 2BR | $260–$425 | $343K |
| 1,200 sq ft 2BR/3BR | $250–$400 | $390K |
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Los Angeles Permit Process
Permit Fee Breakdown
Typical 2026 fees for a 600–800 sq ft detached ADU. Always verify with Los Angeles Department of Building and Safety (LADBS) before submitting.
| Fee | Typical Range |
|---|---|
| Plan check | $2,800–$6,500 |
| Building permit | $3,200–$8,500 |
| School fees | $5.17/sf (LAUSD) |
| Impact / capacity fees | $0–$3,000 (LADBS exempts most ADUs <750sf) |
| Total typical range | $6,500–$16,500 |
Climate & Construction Considerations
LA's Mediterranean climate is generally mild but heat events are intensifying: 90°F+ in the San Fernando and San Gabriel Valleys for 30+ days/year. Title 24 cool roofs, ductless mini-splits, and shaded south/west exposures are increasingly important. Hillside lots in Mt. Washington, Silver Lake, and the Palisades require soils reports and grading permits. VHFHSZ wildfire zones mandate Class A roof, ember-resistant vents, and ignition-resistant exterior cladding.
Local Code & Zoning Notes
LA Municipal Code Sec. 12.22-A.33 allows up to 1,200sf detached ADUs and JADUs up to 500sf by-right on R1/R2/R3 lots. LADBS Standard Plan Program provides pre-approved ADU plans that cut review to 30 days. Short-term rental (under 30 days) is prohibited for ADUs under the Home Sharing Ordinance. Coastal Zone lots require a separate Coastal Development Permit.
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