How Much Does an ADU Cost
in Los Angeles?
See real LA County pricing ranges and calculate your personalized estimate in under 60 seconds — no email required.
Garage Conversion
$120,000–$190,000
1-Bedroom Detached ADU
$220,000–$360,000
2-Bedroom Detached ADU
$320,000–$480,000
Based on recent completed ADU projects across Los Angeles County.
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Why This Is More Accurate Than Online Averages
- Based on real ADUs built in Los Angeles County
- Adjusted for finish level and add-ons
- Reflects 2026 material and labor costs
- Built by a licensed California contractor
Most online calculators use national averages. This one is built for LA.
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Why Our ADU Cost Estimates Are More Accurate
Real data from real builds — not national averages or lead-gen marketing.
Based on 100+ LA ADU Projects
Cost data comes from real builds across Los Angeles County — not national averages.
Updated for 2026 Pricing
Reflects current labor, materials, and city requirements.
Licensed & Insured Contractor
CA License #1087088 — not a lead generation website.
What Impacts ADU Cost in Los Angeles?
These six factors determine the final investment range for your project.
Size & Layout
Larger footprints reduce per-square-foot cost but increase total investment.
Utility Upgrades
Sewer, water, and electrical connections vary based on distance and capacity.
Soil & Slope Conditions
Hillside lots and poor soil may require additional grading and engineering.
Finish Level Selection
Standard, premium, or luxury finishes are the biggest per-sqft cost driver.
Permit & City Fees
Each LA County city has different fee structures, timelines, and requirements.
Structural Requirements
Foundation type, seismic bracing, and fire separations affect base cost.
ADU Construction Costs in LA Continue to Shift
Material and labor costs fluctuate throughout the year. Getting a feasibility study now helps you budget realistically before committing to design or architectural plans.
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About This Estimate
This calculator provides cost guidance for planning purposes based on real project data. Actual ADU costs depend on site conditions, material selections, permit fees, structural requirements, and current market prices. For a detailed, property-specific cost breakdown, request a free cost study. All figures reflect 2026 Los Angeles County pricing.
Transparent pricing. Built for Los Angeles homeowners.
ADU Cost Calculator FAQs
Common questions about our ADU cost estimator tool.