Short answer. A permitted ADU adds 25 to 35 percent to the resale value of a Los Angeles home, or $400 to $600 per ADU square foot. On a $1 million home, a 600 sq ft ADU adds $250,000 to $360,000 in appraised value. Rental income covers the build cost in 8 to 12 years before appreciation.
How appraisers value an ADU in Los Angeles
California appraisers use three methods, in this order of weight for ADU property valuation.
- Sales comparison approach. Recent sales of similar properties with permitted ADUs in the same zip code. This is the primary method for residential financing.
- Income approach. Capitalized rental income. Particularly important for properties marketed to investors.
- Cost approach. Replacement cost minus depreciation. Used as a sanity check.
Real LA property value lift by ADU size
| ADU size | Build cost | Typical value lift | Monthly rent |
|---|---|---|---|
| 400 sq ft studio | $160,000 to $220,000 | $180,000 to $260,000 | $1,800 to $2,400 |
| 600 sq ft 1-bed | $220,000 to $320,000 | $250,000 to $360,000 | $2,200 to $3,200 |
| 800 sq ft 1-bed | $280,000 to $400,000 | $320,000 to $460,000 | $2,600 to $3,800 |
| 1,200 sq ft 2-bed | $400,000 to $560,000 | $460,000 to $640,000 | $3,200 to $4,800 |
Numbers reflect 2026 ADU pricing in Los Angeles, Woodland Hills, Studio City, and the wider San Fernando Valley.
Three factors that swing the value lift
- Permitted vs unpermitted. Only permitted ADUs count in the appraised value. Unpermitted units get flagged on disclosure and force a discount at sale.
- Separate utilities. ADUs with their own electric and water meters appraise higher and rent for more.
- Functional layout. A 1-bedroom with a real kitchen and full bath beats a studio of similar size on rent and resale.
When the math does not work
Three scenarios where the ADU adds less than it cost to build.
- Lot value already dominates the property price. Common in Calabasas hillside and Toluca Lake estate lots.
- Build cost overruns by 30 percent or more. Usually a sign of unclear contract scope or hidden site conditions.
- Severely compromised design. Awkward layouts, no outdoor access, or no privacy from the main house all reduce both rent and resale.
For full pricing, see ADU cost in Los Angeles. For California-wide ranges, read how much does an ADU cost in California. To start, see the ADU service page.
