ADU Cost Los Angeles
Planning to build an ADU in Los Angeles? Here's what you should know about the cost before you begin.
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What Impacts the Cost of ADU in Los Angeles?
Many factors affect the cost of building an ADU in Los Angeles. Here are some key points:
Type of ADU You’re Building
Detached units generally cost more than garage conversions or attached ADUs because they require separate foundations, utilities, and sometimes larger square footage.
Site Conditions and Access
If your property is on a slope, has limited access for construction crews, or requires grading, the build will cost more. Tight urban lots also add complexity (and cost).
Material and Labor Costs
ADU construction costs in Los Angeles have gone up because of high demand and supply issues. Material and labor prices will likely stay high in 2025.
Design Complexity
Fancy designs, upgrades, and extras like roof decks or basements can make your ADU cost more. Simpler designs and prefab ADUs typically cost less.
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Average Cost to Build ADU in Los Angeles
Cost Breakdown
Average ADU Construction Cost
Cost per Square Foot
Permitting and Fees
Additional Site Work (if applicable)
Amount
$275,000
$300 - $350
$5,000 - $15,000
$10,000 - $25,000
Cost Breakdown
Average ADU Construction Cost
$275,000
Cost per Square Foot
$300 - $350
Permitting and Fees
$5,000 - $15,000
Additional Site Work (if applicable)
$10,000 - $25,000
Understanding ADUs
ADU Permit Cost Los Angeles
Permit costs depend on the type of ADU you build. They usually cover plan checks, impact fees, school fees, and other city charges. Some fees might be waived for smaller units or affordable housing. Here’s what to expect:
Attached ADU
Built as an extension of your primary residence.
Permit Cost: $4,000–$8,000
Permit Cost: $4,000–$8,000
Conversion ADU
Changes an old garage or inside space into a place you can live.
Permit Cost: $2,000–$6,000
Permit Cost: $2,000–$6,000
Detached ADU
A separate building in the backyard or somewhere else on the property..
Permit Cost: $5,000–$12,000
Permit Cost: $5,000–$12,000
Junior ADU (JADU)
Built inside the main house with a small kitchen and a bathroom that’s shared.
Permit Cost: $1,000–$3,000
Permit Cost: $1,000–$3,000
Cost Estimate
The cost of ADU in Los Angeles depends on things like size, design, and materials. Where your property is and any needed permits or upgrades can also affect the price. Try our calculator tool to get an estimate for your project.
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Cost to Convert Garage to ADU Los Angeles Q/A
Is it cheaper to convert a garage into an ADU or build an ADU from scratch?
Usually, yes! Garage conversions are usually the cheapest because you’re using what’s already there. But costs can rise if you need to repair the structure, add plumbing, or improve insulation.
What’s the typical cost to convert a 2-car garage to an ADU in Los Angeles?
For a standard 2-car garage (around 400–500 sq ft), the cost to convert it into an ADU usually ranges from $100,000 to $145,000, depending on the materials and finishes you choose.
Do I need to upgrade utilities when converting a garage?
Most of the time, yes. You’ll likely need new plumbing, electrical work, heating and cooling, and maybe an upgraded main electrical panel to handle it all.
Let’s Fully Upgrade Your Garage
With the right plan and ADU Scale by your side, your garage conversion can become a cozy home, functional workspace, or income-generating rental.
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Thinking about adding an ADU to your Los Angeles property? No matter your reason, one big question comes to mind: What's the cost to build an ADU in Los Angeles?
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