ADU Rental Income: Real Numbers by City

ADU rental income is the money a homeowner collects by renting out an accessory dwelling unit, typically a detached backyard unit with its own kitchen and bathroom. Based on our internal city-level data across 30 markets, a one-bedroom ADU rents for an estimated $1,700 to $3,650 a month, and the construction cost is typically recovered in an estimated 3.5 to 7 years, depending heavily on your specific city.

Those numbers are not a promise. They are what the math says when you run real rent and construction-cost data through a simple payback formula, city by city. Below is the full table, how we calculated it, and the honest caveats that come with any income projection.

What Counts as ADU Rental Income

ADU rental income is simply the rent a tenant pays you for living in your accessory dwelling unit, whether that's a detached backyard unit, an attached suite, or a converted garage. It shows up on a Schedule E at tax time the same way any other rental property does, and like any rental property, the number that actually matters isn't the sticker-price rent. It's rent minus vacancy, minus the cost of getting the unit built in the first place.

Every "ADU rental income" article on the internet quotes a single national average, which is a little like telling someone the average home price in America and expecting that to help them shop in their own zip code. Rent in building an ADU in Newport Beach, California and rent in Miramar, Florida are not the same conversation, so we didn't treat them like one.

How We Calculated These Numbers

Transparency first, because a rental income table with no visible math is just a marketing graphic. Here is exactly what's behind every row below:

• Rent: Each city's estimated median 1-bedroom ADU rent, from Build With A Plan's own city-level compliance and market database, the same data layer that powers our free feasibility check.
• Occupancy: Each city's estimated average occupancy rate, applied against 12 months of rent to account for realistic vacancy rather than assuming a tenant on day one, every year, forever.
• Construction cost: A 600 sq ft one-bedroom unit at that city's typical ADU construction cost per square foot. 600 sq ft is a representative size, not a minimum or a recommendation for your specific lot.
• Payback period: Estimated construction cost divided by estimated annual rental income. This is a simplified payback calculation. It does not account for financing costs, property tax changes, insurance, maintenance, or the design and permitting fee.

Every figure in the table is an estimate, not a quote for your address, your unit, or your tenant. Rent and occupancy shift with the market, and your actual construction cost depends on your lot, your finish level, and your builder's bid.

Estimated ADU Rental Income by City (Top 30)

Ranked by estimated payback period, fastest first. Click any city for its full ADU design and permit rules.

Don't see your city? These 30 simply had the fastest estimated payback among the cities in our database with complete rent, cost, and occupancy data. Run your own address through the free feasibility check below for a property-specific estimate.

What Drives the Differences Between Cities

Three inputs decide where a city lands on this list, and they don't always move together, which is exactly why a coastal California suburb and a Colorado college town can end up a few tenths of a year apart.

• Rent level. San Francisco's estimated $3,643/mo 1BR rent is the highest on the list, but its high construction cost ($350/sq ft) keeps its payback at an estimated 5.0 years rather than putting it in first place.
• Construction cost per square foot. Newport Beach tops the list not because it has the highest rent, but because its estimated $225/sq ft construction cost is moderate relative to its rent. A high-rent city with high build costs can lose to a moderate-rent city with low build costs.
• Occupancy rate. A city with strong rental demand and low estimated vacancy (Newport Beach and Ventura both sit at an estimated 96%) keeps more of that sticker-price rent as real annual income than a city where occupancy runs lower, like Palm Beach Gardens at an estimated 83%.

Notice the pattern in this specific list: Florida and California dominate, and Texas, Arizona, and Oregon markets don't appear in this particular top 30. That doesn't mean those states are bad ADU markets. It means their fastest-payback cities didn't crack the 30 fastest across our entire published dataset this time. A Texas market with lower construction costs can still produce a strong payback story, just not one that outran these 30 on this specific formula. Unit configuration matters too; see our attached vs. detached ADU comparison for how that choice shifts your own cost side of this equation.

Turning This Into Your Own Numbers

A city-wide estimate tells you where to look. It doesn't tell you what your specific lot, in your specific neighborhood, can actually support. Our ADU design service starts with exactly that property-specific question, and if the plan changes down the line, from a rental unit to housing family, see our guide on building an ADU that can convert between the two.

From there, permit-ready drawings take an estimated 10 business days, starting at $997 for self-serve packages or $6,000 for a fully custom-drawn set. Build With A Plan designs the unit and manages the permit-ready documentation; you (or the vetted builder we connect you to) handle construction and, eventually, finding a tenant.

The Fine Print

This section matters more than the table above it, so we're not burying it in a footnote. Every number on this page is an estimate built from our internal city-level data and a simplified payback formula. None of it is a guarantee.

• Actual achievable rent depends on your unit's finish level, exact location within the city, and the rental market at the time you list it, none of which we control.
• Occupancy rates are historical estimates, not a promise of future tenancy. A vacant month changes your real numbers immediately.
• Construction cost varies by lot conditions, site access, and your builder's bid. The per-square-foot figures here are city-level typicals, not a quote.
• The payback calculation excludes financing costs, property tax, insurance, maintenance, and the design fee, so your real breakeven point will typically run longer than the simplified number shown.
• This is not tax or investment advice. Talk to a tax professional and, if you're financing the build, your lender, before treating any figure here as a number you can bank on.

Frequently Asked Questions

What is ADU rental income?

ADU rental income is the rent a tenant pays to live in your accessory dwelling unit, whether it's a detached backyard unit, an attached suite, or a converted garage. It's reported as rental income the same way any other rental property income is, minus the expenses and vacancy that apply to any rental.

How much can I rent my ADU for?

It depends heavily on your city. Across the 30 markets in this guide, estimated median 1-bedroom ADU rent ranges from about $1,700 to $3,650 a month. Your specific rent depends on your unit's size, finish level, and exact neighborhood, so treat city-wide figures as a starting point, not a quote.

What is a good payback period for an ADU?

There's no universal answer, but the cities in this guide range from an estimated 3.6 to 7.0 years using a simplified construction-cost-over-annual-rent formula. A shorter estimated payback generally reflects a favorable ratio of rent to construction cost in that market, not a guarantee of that outcome on your specific property.

Is ADU rental income taxable?

Yes, rental income from an ADU is generally taxable, reported similarly to income from any other rental property, and you may be able to deduct related expenses. Tax treatment depends on your specific situation, so confirm the details with a tax professional rather than relying on general guidance here.

Which cities have the best ADU rental income potential?

Based on our internal data, the fastest estimated payback periods in this guide belong to Newport Beach, CA (3.6 years), Doral, FL (4.7 years), Mountain View ADU rules, CA (4.8 years), and ADU in San Francisco, CA (5.0 years). These estimates reflect city-level rent, construction cost, and occupancy data, not a guarantee for any individual property.

How is ADU rental income estimated on this page?

Estimated annual income is calculated as median 1-bedroom ADU rent multiplied by 12 months and adjusted for each city's estimated occupancy rate. Estimated payback period divides a 600 sq ft unit's estimated construction cost by that annual income figure. Full methodology is in the section above the table.

Does renting my ADU require a permit?

The ADU itself needs a building permit to be legally habitable and rentable, regardless of whether you plan to rent it. Some cities add additional requirements for rental use, such as a rental registration or inspection, so check your specific city's rules before listing the unit.

Can I use projected ADU rental income to qualify for financing?

Some lenders will count a portion of projected ADU rental income toward loan qualification, but policies vary significantly by lender and loan type. Ask your specific lender how they treat projected rental income before assuming it will factor into your approval.