Enter your state, ADU type, and project budget. Get an instant payback period, monthly rental income estimate, and property value impact — based on real regional data.
ADU return on investment is not a single number — it is the combination of three separate value streams that compound over time: monthly rental income, property value appreciation, and operating cost offset (when the ADU is used for family members who would otherwise pay market rent elsewhere).
The 30% operating expense assumption in this calculator is conservative for a well-managed ADU. Well-maintained units in strong rental markets with reliable tenants often run closer to 20–25%. Higher expense ratios apply to short-term rentals, older structures, or properties in markets with high property management fees.
The following ranges reflect completed ADU projects in active rental markets. Payback periods include total project cost (construction + design + permits) divided by net annual rental income after a 30% operating expense assumption.
| Market | 1-Bed Rent Range | Est. Payback Period | Property Value Impact |
|---|---|---|---|
| California (Bay Area / LA) | $1,800 – $3,200 | 8 – 13 years | +18% – +28% |
| Washington (Seattle metro) | $1,500 – $2,600 | 9 – 14 years | +15% – +24% |
| Oregon (Portland) | $1,300 – $2,200 | 9 – 14 years | +14% – +22% |
| New York (Hudson Valley / suburbs) | $1,400 – $2,800 | 10 – 16 years | +14% – +22% |
| Massachusetts (Boston metro) | $1,500 – $2,800 | 10 – 16 years | +14% – +24% |
| Colorado (Denver / Boulder) | $1,200 – $2,100 | 9 – 14 years | +13% – +20% |
| Virginia (Northern Virginia) | $1,300 – $2,200 | 9 – 14 years | +13% – +20% |
| Georgia (Atlanta) | $1,000 – $1,700 | 8 – 13 years | +11% – +18% |
| Texas (Austin / Dallas) | $950 – $1,700 | 8 – 13 years | +11% – +18% |
| Florida (Miami / Orlando) | $1,050 – $1,900 | 8 – 13 years | +12% – +19% |
| Minnesota (Twin Cities) | $1,100 – $1,900 | 9 – 15 years | +11% – +17% |
| Tennessee (Nashville) | $1,050 – $1,900 | 8 – 13 years | +11% – +18% |
| Ohio (Columbus / Cleveland) | $850 – $1,450 | 8 – 13 years | +10% – +16% |
| Michigan (Ann Arbor / Detroit) | $900 – $1,550 | 8 – 13 years | +10% – +17% |
| Wisconsin (Madison) | $1,050 – $1,800 | 9 – 14 years | +10% – +17% |
* Payback periods reflect total project cost divided by net annual rental income after 30% operating expenses. Property value increases are estimates — actual impact depends on local market, comparable sales, and appraisal methodology. See your state guide for market-specific data.
Garage conversions and basement conversions cost 40–55% less than detached new construction. If your existing structure qualifies for conversion, starting there significantly improves ROI — you reach the same rental income with a much lower investment denominator. The payback period on a $80,000 garage conversion at $1,200/month rent is dramatically shorter than a $220,000 detached build at the same rent.
Tenant turnover is the largest variable cost in ADU landlording. A stable long-term tenant at slightly below-market rent produces far better net returns than a revolving door of market-rate tenants with 30-60 day vacancy gaps between each. Unit quality — finishes, appliances, insulation, sound isolation — is the single biggest driver of tenant retention.
University markets (Madison, Ann Arbor, Knoxville, Eau Claire) maintain consistent demand independent of economic cycles. Major employer anchors (Mayo Clinic in Rochester, Fort Campbell in Clarksville, Fortune 500 clusters in Minneapolis) produce stable, well-compensated tenant demand. Proximity to employment density is the strongest predictor of consistent ADU rental income.
ADUs built to higher energy performance standards command premium rents and retain tenants longer. Low utility bills are a direct financial benefit that tenants value — in markets where tenants pay utilities, a high-performance ADU can command $100–$200/month premium over minimum-code construction. The premium pays back in 3–5 years through lower vacancy and higher rents.
An unpermitted ADU has zero appraised value. It cannot be included in a refinance. It cannot be legally rented. The property value increase component of ADU ROI — which represents 10–28% of home value — only exists for permitted ADUs. Never build unpermitted.
State guides include city-by-city rental ranges, permit costs, and market-specific ROI data.