The Quick Read: Usually, yes, but only when the ADU is a legal unit, its rent is supported by the appraiser’s rent schedule or an eligible lease, and the property fits the program’s unit-count and property-type limits, with the rent you actually collect never being the number that sets coverage. An ADU, or accessory dwelling unit, is a second, smaller home on the same lot. When it counts, its rent is added to the main house’s rent before the lender divides by the full monthly payment. When it does not count, the ADU can still be a nice bonus for you, but the lender treats it as if it were not there.
- A legal, permitted ADU with supported rent adds to the top of the DSCR calculation.
- An unpermitted ADU is typically left out of both income and value.
- The lender’s rent used for lender review comes from the appraisal or an eligible lease, often the lower of the two.
- Rent from an ADU that is not built yet generally cannot be counted.
- A larger rent line helps coverage, but it never removes leverage caps, credit floors, or reserve rules.
Key Terms Defined
ADU (accessory dwelling unit): A separate small home on the same lot as the main house, such as a backyard cottage, garage conversion, or basement apartment.
DSCR (debt service coverage ratio): Monthly rent used for lender review divided by the full monthly housing obligation on the property.
PITIA: Principal, interest, taxes, insurance, and association dues, which together form the monthly payment side of the DSCR math.
Rent schedule: The appraiser’s estimate of market rent for each unit. The 1007 form covers single-family homes, and the 1025 form covers small 2-4 unit income properties.
LTV (loan-to-value): The loan balance as a percentage of the property’s value.
Certificate of occupancy: The local sign-off that a space is legal to live in.
DSCR Calculator
Run the numbers in your market
Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Oct 15, 2026
Prefilled with starting assumptions — enter your own rent or nightly figures, taxes, insurance, and HOA for a more accurate picture.
Program parameters update from Lendmire’s centralized guideline source. Taxes and insurance are editable estimates.
As of Oct 15, 2026 · General Freddie Mac market benchmark, not a Lendmire loan offer. Rent, nightly rate, occupancy, taxes, and insurance are editable estimates. Short-term rental figures are estimates only and vary significantly by season, property type, management approach, and local short-term-rental rules — confirm local regulations before relying on them. Qualifying income for short-term rentals varies by program — some use appraisal market rent, others use documented STR history or projections — and is confirmed in underwriting. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
How Does ADU Rent Enter the DSCR Formula?
The ADU rent goes into the numerator. Rent used for lender review from every legal unit is added together and divided by PITIA. The ratio is the answer, and it does not use your personal income as a denominator.
Run the numbers on a modeled example. These are assumptions for illustration, not market data. Say the main house alone covers about 0.85x of the full monthly obligation. A legal ADU with supported rent adds roughly 0.30x. The combined file lands near 1.15x.
| Scenario | Rent counted | Modeled coverage |
|---|---|---|
| Main house only | Main house | About 0.85x |
| Legal ADU, rent supported | Main + ADU | About 1.15x |
| Legal ADU, lease above market | Main + ADU at market | About 1.15x |
| Unpermitted ADU | Main house only | About 0.85x |
The same property swings from a thin file to a comfortable one based on one question: does the lender recognize the ADU’s rent? Across the wholesale network Lendmire places files with, 1.00 is where many select programs start. Stronger ratios open better pricing and leverage. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted.
Clearing 1.00 is not the same as positive cash flow. Repairs, vacancy, management, utilities, and capital costs sit outside the calculation. An ADU can lift the ratio and still leave you with a property that needs a real reserve fund.
The payment side also matters. Association dues belong in PITIA, so a property in a managed community carries them in the denominator. Lendmire’s piece Do HOA Dues Count Against the Rent on a Short-Term Rental DSCR Loan? walks through that side of the math.
Which Rent Counts: The Lease, the Appraisal, or the Lower of the Two?
Rent used for program review comes from the appraisal’s rent schedule or from an eligible lease, depending on the program. Many programs use the lower of the two. Rent you collect in cash, or at a number above market, does not set the income automatically.
Here is how the common situations usually play out on the programs Lendmire sees:
| Situation | What the lender typically leans on |
|---|---|
| ADU leased at market | Lease, checked against the appraisal |
| ADU leased above market | Often the lower figure |
| ADU finished but vacant | Appraiser’s market rent, where comps support it |
| ADU not yet built | Generally nothing |
| ADU leased below market | Often the lower lease figure |
The appraiser’s rent estimate is only as good as the comps behind it. A thin set of nearby ADU rentals can lead to a conservative number. Ask the appraiser’s office, through your loan team, whether ADU rent will be shown as its own line.
Trade press on ADU financing makes the same point about timing: projected rent from a unit that does not exist yet can’t count. A finished, legal unit with a lease or a supported market rent is a different file.
Does the ADU Have to Be Permitted?
Yes, in practice it does. The lender relies on the appraiser’s finding about legal use. If the unit is not recognized as legal, its rent and often its value are left out of the file.
A DSCR loan is based on rent, so many investors assume permits do not matter. The reverse is true. The lender has to be able to own, operate, and sell the property in a worst case, and an illegal unit is a liability in that scenario.
| ADU status | Typical treatment | What to do next |
|---|---|---|
| Permitted and leased | Rent can count | Gather permit, lease, payment proof |
| Permitted and vacant | Market rent may count | Rely on the appraisal rent schedule |
| Unpermitted | Usually excluded | Price the deal on main-house rent only |
| Older, grandfathered | Depends on local legal-use status | Get written confirmation of status |
| Under construction | Generally excluded | Wait for completion and sign-off |
Lender practice varies. Treatment depends on the appraisal assignment, the lender’s guidelines, the local legal-use classification, and the available comps. An unpermitted unit can also cause trouble later, at refinance, even if the rent was real the whole time.
Unit Count, Occupancy, and Property Type
A property with one legal ADU is typically reviewed as a multi-unit income property. Where the main house is one unit and the ADU is a second, the file often lands in the small 2-4 unit category. Confirm how the program you are considering classifies it.
DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage. If you plan to live in the main house or in the ADU, that is a different conversation, and the DSCR path is generally not the right fit. A no-ratio structure is available only through select lenders, generally for borrowers who already own a primary residence.
Multiple ADUs are where programs get conservative. Some lenders will recognize only one ADU for financing purposes, even when local rules allow more. Ask before you plan around a second or third unit.
Property type still matters. Manufactured homes (single- and double-wide), log homes, and barndominiums are not offered in the network’s DSCR programs. A great ADU does not change that.
Garage Conversions, Basements, and Junior ADUs
Habitable-space rules and permit status decide these. A garage converted into a living unit with a permit and a certificate of occupancy is treated like any other legal unit. A garage converted with no permit is treated like an unpermitted ADU.
Basement apartments follow the same logic. They need legal egress, proper ceiling height, and a separate permit record in most places. A junior ADU, which is a small unit carved out of the main house, is often limited by local rules and may share kitchen or bath features with the main home. Lenders may decline to count it as a separate unit.
Shared utility meters are another quiet barrier. When the ADU and the main house run off a single meter, some lenders ask more questions about whether the unit is truly self-contained.
What About Short-Term and Projected ADU Rent?
Short-term use of an ADU is reviewed under the program’s short-term-rental rules, not the long-term lease rules. For short-term-rental collateral, purchase leverage tops out at 75% LTV, and cash-out tops out at 70% LTV. Most programs also expect around 640 or higher on credit and about 12 months of hosting history. That is a different file from a long-term lease, so ask your loan team which path fits.
Short-term rental rules can vary by city, county, HOA, and property type, so investors should confirm local rules before relying on projected rental income. Lendmire’s piece Does the Gross Payout or Net Booking Count as Rent on a DSCR Loan? covers how lenders read booking income.
Projected rent is a separate matter. If the unit is not built or not rentable yet, plan on the file being underwritten without it.
Why FHA and VA ADU Rules Do Not Carry Over
Agency loans have their own ADU rules, and DSCR files do not borrow them. HUD’s FHA guidance caps ADU rent at 30 percent of the borrower’s effective income and bars it on a cash-out refinance of a one-unit property with an ADU. It also requires the ADU to be legally rentable.
The VA’s ADU rental-income guidance uses the lower of the lease or the appraiser’s rent and applies a vacancy factor. Both frameworks run off a borrower’s personal income.
A DSCR file has no borrower-income denominator, so those caps and haircuts are not the DSCR method. DSCR qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. On a cash-out refinance, check the specific program, because ADU treatment is set by each lender and not by an agency rule.
DSCR vs. conventional financing
There are two common ways to finance an investment property, and they qualify you differently — here’s how investors weigh them.
Why investors choose it
- Qualifies on the property’s rental income — no personal tax returns, W-2s, or pay stubs needed to document income.
- No personal debt-to-income ceiling to clear, so existing mortgages and obligations don’t cap your borrowing the same way.
- Can be closed in an LLC, keeping the property inside a business entity.
- Built for scaling — not held to the limit on number of financed properties that conventional financing applies.
- Underwriting centers on the deal: generally qualifies when the rent covers the payment, a 1.00x coverage ratio being a common baseline (confirmed in underwriting).
- Designed specifically for investment property, including long-term and, where the program allows, short-term rentals.
Where it’s strong
- Often the lowest ongoing financing cost for a buyer who fully qualifies on personal income — a fit for a first property or a cost-first purchase.
Trade-offs for investors
- Requires full personal income documentation and must fit within a debt-to-income limit — salary, existing debts, and other mortgages all count.
- Typically held in your personal name rather than a business entity.
- Caps how many financed properties you can carry, which can become a ceiling as a portfolio grows.
- Evaluates you as a borrower as much as the property, which usually means more paperwork.
How investors usually choose: a first or single property often optimizes for the lowest financing cost; portfolio builders often optimize for leverage, vesting in an LLC, and scaling past conventional caps. The right answer depends on your goals, the property, and current guidelines — both paths run through select lenders in Lendmire’s wholesale network, with eligibility and terms confirmed in underwriting.
Does a Legal ADU Raise the Value?
It may support a higher appraised value, depending on comps and underwriter review. Appraisers of small properties often lean on sales comparisons more than on income math. A legal ADU with nearby sales of similar properties tends to be easier to value than a one-of-a-kind setup.
The public data is thin. FHFA reports that ADU fields were added to its appraisal data and that the ADU sample is limited. It covers only California single-family purchase appraisals on loans backed by the housing enterprises. That is context showing appraisers record ADUs, not evidence of how DSCR files value them.
Why ADU Income Gets Excluded, and How to Fix It
Most exclusions come from a short list of problems, and most can be spotted before you make an offer.
- No permit or certificate of occupancy. Get the records from the local building department, or price the deal without the ADU.
- No supporting comps. Ask your loan team how the appraiser will estimate rent for the unit.
- Lease above market. Expect the lower figure to be used.
- Unit-count limits. Confirm the program’s treatment before counting a second ADU.
- Not finished. Plan on completion before the rent counts.
- Property type. Manufactured homes, log homes, and barndominiums are not offered.
Pre-Offer Checklist and Questions for Your Lender
Gather these before you write an offer:
- Permit records and certificate of occupancy for the ADU
- Current leases for every rented unit
- Proof of rent payments
- Photos and a floor plan showing a separate kitchen, bath, and entrance
- Utility details, including whether the meters are separate
Then ask your loan team:
1. Will the ADU rent be underwritten as its own line?
2. Does the program use the lease, the appraisal, or the lower of the two?
3. How many ADUs will the lender recognize?
4. How is the property classified for unit count?
5. What changes if the unit is vacant?
How Leverage, Credit, and Reserves Fit In
A stronger ratio helps, but it does not erase the other tests. Across the network, most purchase files on investment properties land at 75%-80% LTV, and cash-out refinances on standard rentals top out around 75% LTV. A 620 credit floor exists in parts of the network, and most programs want around 660. A score of 700 or higher unlocks the strongest leverage tiers.
Standard programs reach up to $3,000,000. Reserves commonly run about 6 months of PITIA, stepping up to about 9 months on loans above $1,500,000. These ranges are typical, not promises, and each file is underwritten individually. Programs change, and nothing here is a commitment to lend.
The strongest files clear two tests: enough equity and enough rental coverage. For a wider look at how those tests fit together, see Lendmire’s complete DSCR loans guide.
Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.
Frequently Asked Questions
Can I count ADU rent if the ADU is already leased?
Yes, if the ADU is legal and the lease is eligible under the program. The lender will typically compare the lease to the appraiser’s market rent and use the supported figure, often the lower one. A lease alone does not make an illegal unit count.
Does a vacant ADU count toward DSCR?
It can, if the unit is finished and legal. With no lease, the appraiser’s market rent for the unit is usually the support, so the strength of nearby comps matters. A unit that is not built or not rentable yet generally cannot be counted.
What happens if my ADU was built without a permit?
It is typically left out of both the income and the value. The main house is underwritten on its own rent. If the numbers still work that way, the file may proceed. If not, the usual fix is to legalize the unit and then revisit the loan.
Can I have more than one ADU counted?
It depends on the program. Some lenders recognize only one ADU for financing purposes, even where local rules allow more. Ask about unit limits before you build the plan around extra units.
Does adding ADU rent let me skip the other requirements?
No. The ADU can lift coverage over a threshold, but credit, reserves, leverage caps, and property eligibility still apply. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted.
Next Step
If you are buying or refinancing a rental property and want to see how the numbers work, Lendmire can help you compare DSCR loan options based on the property income, credit profile, leverage, and investor goals. Lendmire is a broker arranging financing through select lenders in its wholesale network, covering 41 markets including Washington, D.C.
About Lendmire
Lendmire is a non-QM mortgage brokerage (NMLS# 2371349) arranging DSCR investor loans in 41 markets, including Washington, D.C. DSCR eligibility is generally reviewed around property-level rental income rather than personal income, subject to lender and program guidelines, a fit for self-employed investors and LLC-owned portfolios. Lendmire was recognized as a Scotsman Guide Top Mortgage Workplace in 2025 and 2026.
Get Started
Ready to find the right loan for you?
In about 30 seconds you can review financing options available for your investment property. No commitment required.
Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. Realty Times: How creative financing fuels the ADU boom for real estate investors
2. HUD Mortgagee Letter 2023-17
3. Military.com: VA loan ADU rules and rental income
4. FHFA: Trends in median appraised value for properties with ADUs in California
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Interest-Only DSCR Loan vs. 1099-Only Loan · How to Compare DSCR Loan Quotes From Three Lenders · No-Ratio DSCR Loan vs Profit and Loss Only Loan
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.