ADU cost · 500 Sq Ft
500 sq ft ADU
cost in LA.
A 500 sq ft ADU is a popular size for a studio or 1-bedroom — efficient, affordable, and quick to permit. Here's what 500 square feet typically costs in Los Angeles by ADU type (all-in: construction + soft costs + contingency).
Open the full cost calculator →Estimated all-in cost
500 sq ft by ADU type.
Ranges below are all-in (construction + soft costs + contingency) for 500 square feet in Los Angeles. Your exact number depends on finishes and lot conditions — model it precisely with the calculator.
Garage conversion
fastest, most affordable
$125K
$200K
Internal ADU
within the existing home
$130K
$210K
Attached ADU
added to the house
$150K
$250K
Detached ADU
standalone, best resale
$165K
$280K
Estimates for planning only — not a quote. Book a consultation for a firm number on your lot.
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Our free interactive calculator models hard cost, soft cost, and contingency across every ADU type, size, and finish level — a real range, not a press-release number.
Open the ADU cost calculator →Questions
ADU cost in 500 Sq Ft — your questions.
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How much does a 500 sq ft ADU cost in Los Angeles?
A 500 sq ft ADU in LA typically runs about $125K–$280K all-in depending on type and finishes. A garage conversion at this size is on the lower end; a detached new-build with upgraded finishes is on the higher end. Use the calculator below for a range tuned to your lot.
What's the cheapest way to build a 500 sq ft ADU?
Converting an existing garage (if you have one near that size) is usually the most affordable path, since you reuse the structure and foundation. A detached new-build costs more but adds the most privacy and resale value.
Why is there a range instead of one number?
Because cost depends on finish level, site conditions, and ADU type. Two identical-sized ADUs can differ 2× based on lot access, utility runs, and finishes. Anyone quoting a single guaranteed number before seeing your lot is guessing.
Does this include permits and design?
The high end includes soft costs (architecture, engineering, permits, utility taps) plus an ~8% contingency. Hard construction cost alone is roughly 20% lower.
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