The ADU Math in LA: Costs, Rents, and When You Break Even

Rents have softened slightly in some LA submarkets, but construction costs have stabilized. Does a 2-bed detached ADU still pencil in 2026? Yes, but the margin is thinner than it was a year ago. You need to run your numbers carefully.

The Pro Forma

Location: Mid-tier LA submarket (San Pedro, Mid-City, Northeast LA). Unit: 2-bedroom detached ADU, 1,200 square feet. Build cost: $260,000 including soft costs and permits. Expected rent: $2,700/month. Vacancy: 5%. Operating expenses: 25% of effective gross income. Financing: 80% LTC at 6.5%, 30-year amortization.

Build Cost Breakdown

Construction costs in LA have leveled out around $200-$220 per square foot for a quality 2-bedroom detached ADU. Base construction on a 1,200 sqft unit at $210/sqft runs $252,000. Add $8,000 in soft costs. Total: $260,000.

The Numbers

Effective gross income: $2,700 x 12 x 0.95 = $30,780/year. Operating expenses at 25%: $7,695. NOI: $23,085.

Loan amount: $208,000. Annual debt service at 6.5%: $15,780. Cash flow before taxes: $7,305/year. Cash-on-cash return on your $52,000 down payment: 14%.

Yield on cost: $23,085 / $260,000 = 8.9%.

The Refinance Play

Assuming 3% annual rent growth, by Year 3 your NOI reaches roughly $25,600. At a 5% cap rate, the unit appraises at $512,000. After paying off the $196,000 remaining loan balance, you pull out $316,000 in cash. You've recovered your initial investment and then some, and you still own the asset.

Why It Still Works

The big value comes from refinancing at a higher valuation, not from monthly cash flow alone. If you're counting on massive rental upside or cheap builds, this isn't the play. This is about stable income, neighborhood growth, and smart financing.

AB 976 eliminated the owner-occupancy requirement for ADUs. You can now build purely as a rental investment without living on the property. That changed the math for investors.