The Quick Read: It depends on the lender program, but rent from both ADUs can count when each unit is legal and permitted, the program recognizes more than one ADU, and the appraiser supports a separate rent for each unit. A unit that fails any of those tests usually adds nothing to the ratio. Across the wholesale network Lendmire places files with, programs treat this differently, so the answer is a property-and-program match, not a universal rule.
- Legal status is the gate. Unpermitted units are generally left out.
- The appraisal sets the rent, not your bank deposits.
- Some programs credit one ADU, and others credit more.
- A house plus two ADUs may be classified as a three-unit property, which changes the appraisal.
- Clearing 1.00 coverage is not the same as positive cash flow.
What Does “Counting” Mean in a DSCR Loan?
Counting means the unit’s rent goes into the top of the coverage formula. A DSCR (debt service coverage ratio) is the property’s rent used for lender review divided by its PITIA. PITIA is principal, interest, taxes, insurance, and association dues, all on a monthly basis. If the lender credits $0 for an ADU, that unit does nothing for you.
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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.
Here is the catch. Adding an ADU can also raise the bottom of the formula. A second structure usually means more insurance and sometimes more tax. So an ADU only helps when the rent it adds grows faster than the cost it brings.
DSCR loans are built for investment properties, and the loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. That is why the rent figure gets so much scrutiny. For the full picture, see Lendmire’s complete DSCR loans guide.
Key Terms Defined
ADU (accessory dwelling unit): A second, smaller living space on the same lot as the main house, such as a backyard cottage, garage conversion, or basement apartment.
PITIA: The full monthly housing obligation: principal, interest, taxes, insurance, and association dues.
Rent schedule (Form 1007): The appraiser’s estimate of market rent for a single-family property, usually based on a standard long-term lease.
Form 1025: The small residential income report an appraiser uses for two-to-four-unit properties, with rent shown per unit.
LTV (loan-to-value): The loan amount as a percentage of the property’s value.
Does Rent From Two ADUs Add Up?
Yes, when the program credits both units and the appraisal supports both rents. The lender adds up the rent it credits and divides by PITIA. Some programs credit only one ADU, and some credit more than one. Confirm the program’s ADU limit before you go under contract.
Classification comes first. The appraiser decides whether this is a single-family house with ADUs or a multi-unit property. HousingWire frames that choice as a house with an ADU (Form 1004) versus an income property (Form 1025), and says the purchaser’s motivation drives the call. A main house plus two ADUs can be read as a three-unit property. That points toward the 1025 and its per-unit rents.
The comps are the practical risk. Working RE Magazine notes that an appraiser may need adjustments between properties with no ADUs, one ADU, or two. Ideally the comps have the same number of ADUs. Two-ADU properties are rare, so thin comps are the usual reason a second unit’s rent gets trimmed or dropped.
Zoning approval for extra ADUs does not automatically make a property a legal multifamily. Appraisers argue about this, and a Form 1025 on single-family-zoned land can be challenged. If the classification is shaky, expect questions.
The Five Tests Each ADU Must Pass
Each ADU is judged on its own. Passing one test does not rescue a unit that fails another. Here is how lenders in the network typically look at it.
| Test | What the lender looks for | If it fails |
|---|---|---|
| Legal status | Permits, certificate of occupancy, zoning fit | Rent usually excluded |
| Habitability | Kitchen, bath, separate entrance | Unit may not count as a dwelling |
| Appraisal support | Market rent per unit, usable comps | Rent trimmed or dropped |
| Occupancy evidence | Lease if leased; market rent if vacant | Lower of the two often used |
| Program limits | How many ADUs the program credits | Extra units ignored |
Dwelling Index says unpermitted ADUs, or ADUs without a certificate of occupancy, generally disqualify the rent. That matches what brokers see. Rent in your bank account proves you collect it. It does not prove the lender can use it.
A Worked Example: Both Units, One Unit, No Units
These are modeled assumptions, not market data. Assume the main house alone covers about 0.85x of PITIA. Assume each ADU adds roughly 0.20x of coverage after the extra insurance and tax load is built into PITIA.
| Scenario | Units credited | Modeled coverage |
|---|---|---|
| Both ADUs count | House + 2 ADUs | About 1.25x |
| One ADU excluded | House + 1 ADU | About 1.05x |
| Both excluded | House only | About 0.85x |
Look at what moves. With both units, the file clears 1.00 with room to spare. Lose one unit to a permit gap or a thin comp and the file still clears, narrowly. Lose both and the house sits below 1.00 on its own.
Remember that 1.00 is where many select programs start. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Either way, qualification is subject to lender guidelines, credit approval, and property review.
Run this math both ways before you offer on a two-ADU house. If the deal only works with both units credited, you are betting on an appraiser’s comps. The stronger plan is a deal that still clears with one unit excluded.
Leased, Vacant, or Newly Built?
The documents change with the unit’s status. A leased unit comes with a lease. A vacant unit relies on the appraiser’s market rent. A newly finished unit needs permits, a certificate of occupancy, and usually a clean appraisal rent schedule.
Many programs credit the lower of the lease and the appraised market rent. Others allow some variance when a lease is in place. A mixed case, one leased unit and one vacant, is common. The lender simply credits each unit on its own basis and adds the results.
A typical document set looks like this:
- The appraisal with the rent schedule for each unit.
- Leases for any occupied units.
- Permits, a certificate of occupancy, or zoning confirmation.
- An insurance policy that reflects every structure on the lot.
How Agency Loans Treat Two ADUs
Agency rules do not govern DSCR files, but the contrast explains why this is a non-agency question. Fannie Mae’s SEL-2025-08 lets owner-occupied borrowers use ADU rent, and only one ADU’s rent counts even if multiple ADUs exist. Freddie Mac’s ADU fact sheet bars income from an illegal ADU.
Those are owner-occupied products with their own caps and haircuts. None of that carries over to DSCR. Each DSCR lender sets its own ADU count, documentation, and appraisal rules. That variety is exactly why a broker who sees many programs can match your house to the right one.
What About Short-Term Rental ADUs?
Treat them as a separate path. The standard rent schedule asks for monthly long-term rent, so short-term income needs its own documentation. Short-term rental programs have their own leverage and hosting-history expectations. 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.
Stress-Test the Numbers Before You Apply
DSCR compares rent to PITIA only. Clearing 1.00 is not positive cash flow. Repairs, vacancy, management, utilities, and capital expenses sit outside the ratio.
Two units can add income diversification. If one ADU sits empty, the other two rents still cover part of the payment. But a vacancy that the lender never counted was not helping your file in the first place.
Build three cases. Run both ADUs credited, one ADU excluded, and a conservative case with vacancy and operating costs layered in. If the second case still works, the deal has a cushion.
Reserves matter too. Across the network they commonly run around 6 months of PITIA, and they vary by lender, leverage, loan size, and transaction type. Loans above $1,500,000 typically step up to about 9 months. Newly built ADUs sometimes draw extra attention to reserves.
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.
Leverage, Credit, and Property Rules on a Two-ADU House
A house with two ADUs follows the same leverage rules as any rental. Typical purchase files on an investment property land at 75%-80% LTV, and a cash-out refinance tops out around 75% LTV. Credit tiers run from a 620 floor in parts of the network, to around 660 for most programs, to 700+ for the strongest leverage. Standard loan sizes run up to $3,000,000.
A larger down payment can lower the payment and lift the ratio. It does not erase credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage.
One property rule is worth knowing. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs. A conventional site-built house with permitted ADUs is the profile these programs are built around.
Lenders also see patterns. Files with extra structures often stall on a mismatch between the appraisal form and the program, not on the rent itself. A quick conversation about classification before you write an offer prevents most of those stalls.
Your Before-You-Apply Checklist
1. Pull permits and the certificate of occupancy for each ADU.
2. Confirm zoning allows the number of units you plan to count.
3. Ask the broker how the program classifies a house plus two ADUs.
4. Confirm the program’s ADU limit before contract.
5. Gather leases for occupied units and note which are vacant.
6. Get an insurance quote that covers every structure.
7. Run the three-case stress test above.
Frequently Asked Questions
Can I count both ADUs?
Sometimes. Both can count when each is legal, the program credits more than one ADU, and the appraisal supports a rent for each. Some programs credit only one. The program’s ADU limit is the first thing to confirm.
What if one ADU is unpermitted?
Its rent is usually excluded, and the unit can also hurt value or marketability. Treat unpermitted income as unusable until the unit is legalized. If the file still clears 1.00 without it, the unit becomes a bonus rather than a risk.
What if one ADU is vacant?
A vacant unit is typically credited at the appraiser’s market rent, since there is no lease. A leased unit may be credited at the lower of the lease and the appraised rent. Mixed cases are normal and get credited unit by unit.
Does the property get treated as multi-unit?
A house plus two ADUs may be read as a three-unit property, which points to the Form 1025 income report. Classification depends on zoning, the appraiser’s analysis, and the program, so ask before you make an offer.
Is a two-ADU house a good fit for coverage below 1.00?
It can be, if the file falls short even with both units credited. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted. It is a separate path from the programs that start at 1.00, and it is reviewed subject to lender guidelines.
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 that arranges financing through select lenders in its wholesale network across 41 markets, including Washington, D.C. Nothing here is a commitment to lend.
About Lendmire
As a DSCR and non-QM mortgage broker, Lendmire — NMLS# 2371349 — connects investors with wholesale lending channels across 41 markets, including Washington, D.C. The property’s rental income, not the borrower’s tax returns, is central to lender review, which works for self-employed operators and portfolios beyond four financed properties. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. HousingWire: Appraising a two-unit property
2. Working RE Magazine: When is single-family a multi-family appraisal
3. Dwelling Index: ADU rental income and qualifying
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Lease vs Appraiser Rent on a DSCR Loan for a First-Time Landlord · Can Lake House Short-Term Rentals Share One Portfolio DSCR Loan? · Can You Get a DSCR Loan on a New Lease Before Any Rent Is Collected?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.