Rental ADUs for investors
A rental ADU adds a door on land you already own, usually for well under half the cost of buying a comparable rental. Built right, it cash flows from the first tenant and creates equity the day it’s finished. The deal is only as good as the site costs, the local rules and the unit’s appeal to tenants — so underwrite all three.
ADU built for rental incomeSix things we’ve learned building them
Build a door, don’t buy one
No land cost, no bidding war, no inherited maintenance. If you can build for around 40% of the cost to buy, why buy an asset that doesn’t cash flow?
Underwrite fully loaded
Rent minus the loan payment isn’t cash flow. Subtract vacancy, taxes, insurance and reserves, and check the deal still works.
Use the 1% rule as a screen
Most purchases today fall far short of monthly rent at 1% of cost. A well-designed ADU typically clears it — tested on the full project cost.
Design for the tenant
Privacy, a private entrance and patio, in-unit laundry, storage and light. The unit that rents fastest rarely costs more to build.
Budget the site honestly
Septic, long utility runs, separate meters and city tap fees are where ADU budgets break. Carry them as their own line.
Finance with equity you already have
Many owners build with no cash to close through a second-position mortgage — keeping their low first-mortgage rate. Know the risks before you borrow.
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