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

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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
Conversion ADU
Changes an old garage or inside space into a place you can live.

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
Junior ADU (JADU)
Built inside the main house with a small kitchen and a bathroom that’s shared.

Permit Cost: $1,000–$3,000
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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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FAQ

Cost to Convert Garage to ADU Los Angeles Q/A

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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.

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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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More information

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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The Average Cost of ADU in Los Angeles is typically between $150,000 and $300,000.
Remember, converting a garage usually costs less. But if you want a separate, custom-built unit with fancy finishes, it will probably cost more.
Additional Costs You Might Not Expect
Here are a few ADU cost Los Angeles expenses that often surprise homeowners:
  • Soil and geotechnical reports
  • Utility connection or upgrade fees
  • Structural engineering costs
  • Landscaping or hardscaping after construction
  • Temporary housing during build (if required)
Financing Options
Financing your ADU is possible through several methods:
  • Home equity loans or HELOCs
  • Construction loans
  • Cash-out refinancing
  • Local grant and incentive programs (especially for affordable or low-income housing)
Trends in ADU Construction
  • Prefab ADUs are growing in popularity because they’re more affordable and faster to build. A good choice if you want to lower your ADU cost in Los Angeles.
  • More homeowners want energy-efficient ADUs to save money on utilities over time and reduce their environmental impact.
  • And with high rental demand in LA, many see ADUs as a great way to earn extra income.
  • Simpler, modern designs are becoming popular to keep costs down and speed up construction. Clean lines and open spaces help maximize smaller lots.
  • More people are choosing eco-friendly materials that last longer.
  • Thanks to simplified rules, ADU construction in LA has become easier and more affordable.
Building an ADU in Los Angeles is easier than before, but you still need to follow city rules. Here’s what to keep in mind:
  • Choose your ADU type (garage, detached, attached)
  • Check local zoning and size limits
  • Get the right permits
  • Work with experienced pros
  • Plan for utility connections
  • Consider parking requirements
  • Think about privacy and how the ADU fits with your main home
  • Budget for unexpected costs
Getting your ADU built, whether it's a garage conversion or a separate unit, is much simpler with the right team. They'll keep your project smooth and on schedule.
Curious about building an ADU or its potential cost? Contact us for expert advice.
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