The Quick Read: ADU rent can count toward DSCR coverage on a house with two ADUs, but only the rent the appraisal supports and the lender’s program allows. Each unit has to pass its own legal-use and rent-evidence test before it adds to the numerator. The lender then divides the total rent used for lender review by the full monthly obligation.
- The rent used for lender review usually comes from the appraisal, and the lower of the lease and market rent is the common approach.
- Each ADU needs legal-use support. An unpermitted unit is typically left out.
- How the appraiser classifies the property (one unit with ADUs, or a 2–4 unit property) changes the form and the rent lines.
- How many ADUs a program counts is a program decision, not a universal rule.
- Clearing 1.00 coverage is not the same as positive cash flow.
DSCR loans are business-purpose investor products. That matters here because no federal rule tells a lender how to count ADU rent. The treatment comes from the program’s guidelines plus the appraisal. Across the wholesale network Lendmire works with, that produces real differences from one lender to the next. The rest of this piece walks through the mechanics step by step. For the full program picture, see the complete DSCR loans guide.
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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.
Key Terms Defined
ADU (accessory dwelling unit): A second, self-contained living space on the same lot as the main house, such as a garage conversion, a basement unit, or a backyard cottage.
DSCR (debt service coverage ratio): Qualifying monthly rent divided by the full monthly housing obligation on the loan.
PITIA: Principal, interest, taxes, insurance, and association dues. This is the denominator in the coverage calculation.
Market rent: The rent an appraiser concludes a unit would earn on the open market, based on comparable rentals.
Rent schedule: The appraisal exhibit that lists rent by unit. It is the document that carries the rent figure used in the lender’s review.
Highest and best use: The appraiser’s finding on how the property is legally and practically best used. It drives how the property is classified.
Which Rent Number Counts?
The appraisal sets the rent used for program review, and the lender generally credits the lower of the in-place lease and the appraiser’s market rent. A signed lease does not automatically decide the number. Neither does the rent you actually collect.
Lenders work this way because they underwrite how the property would perform if they had to take it back. A lease between friendly parties, or one signed at an above-market figure, tells them little about that. The appraiser’s comparables tell them more.
Here is how the evidence typically breaks down, unit by unit:
| Unit status | Typical rent evidence | Usual rent used for eligibility review |
|---|---|---|
| Leased, permitted | Lease plus appraisal | Lower of lease and market rent |
| Vacant, permitted | Appraisal market rent | Market rent |
| Newly built, permitted | Appraisal market rent | Market rent |
| Unpermitted | Not supported | Typically excluded |
Programs differ on the details. Some treat a mostly vacant building as unleased and want lease evidence before counting the rent. The point is to underwrite on the appraiser’s likely number, not on your asking rent.
Is It a Single-Family Home With ADUs or a Multi-Unit Property?
This is the part that makes two ADUs different from one. Appraisal-trade writing from Richard Hagar, SRA, in Working RE says a subject with two ADUs creates a conflict for the appraiser. The appraiser has to hunt for comparables with the same number of ADUs. The appraiser also has to decide whether the property is still a single-family house with two ADUs or is really a multi-family property.
The classification sets the appraisal form. The same article notes Form 1004 for a one-unit property and Form 1025 for two to four units. For the rent side, McKissock explains that Form 1007 is the one-unit rent schedule, while Form 1025 covers duplexes, triplexes, and fourplexes and weighs both rental income and the fair market value of comparables.
On the agency side, the Fannie Mae Selling Guide shows how classification gets argued. It points to characteristics such as separate utility meters, a unique postal address, and whether the unit can be legally rented, and it leaves the call to the appraiser’s highest-and-best-use analysis. That is a contrast, not a rule. Those agency rules govern agency loans. DSCR files follow the program’s guidelines.
| What the property looks like | Likely classification | Likely form | Rent reported as |
|---|---|---|---|
| House plus two ADUs, shared utilities, one address | One unit with ADUs | 1004 with rent schedule | One figure or a main-plus-ADU analysis |
| House plus two ADUs, separate meters and entrances | May read as 2–4 units | 1025 | Unit-by-unit lines |
| House plus one legal ADU and one unpermitted unit | One unit with one legal ADU | Varies | Legal units only |
The classification can also change program eligibility. A lender that allows a one-unit property with ADUs may treat a 2–4 unit classification under a different set of rules. Ask which classification the program expects before you ever order the appraisal.
How Underwriting Treats a House With Two ADUs, Step by Step
The sequence below is how these files tend to move through review.
1. Program and property-type screen. The lender checks whether its program allows the configuration at all, and whether it counts one ADU or more than one. This is the first gate, and it varies by lender.
2. Legal-use check. Permits, zoning, a certificate of occupancy, and any separate meter or address all get looked at. A BiggerPockets-style practitioner reply may say unpermitted income is left out, and that matches how most programs behave: the lender cannot lean on income from space the jurisdiction does not recognize.
3. Appraisal and classification. The appraiser decides how to classify the property and orders the right form. Comparable support follows.
4. Comparable support. Finding even one ADU comp is hard in many areas, and with two ADUs the appraiser may need comps with the same count. An Oregon DEQ practitioner guide recommends giving the appraiser proof of legality, rental agreements, and build-cost breakdowns, and notes that Form 1025 may be the better format if all three approaches to value are developed. It also points out that appraisals on ADU properties can cost more. The guide is older, but the documentation habit still holds.
5. Rent selection per unit. Occupied units use the lower of lease and market rent. Vacant units use market rent. Each unit is reviewed on its own.
6. The ratio. Total rent used for the lender’s review is divided by the full PITIA. That is the number the lender reads.
The Worked Example: Main House Plus Two ADUs
Run the numbers on a house with a main unit and two ADUs. These are modeled relationships, not market data, and they use ratios instead of dollars on purpose.
Now suppose the appraiser excludes one ADU because the permit trail is incomplete. If that ADU carried about a quarter of the total rent used in the financing review, coverage drops toward 0.94x. The same property, the same loan request, a different outcome.
| Scenario | Units counted | Approximate coverage |
|---|---|---|
| All three units counted | House + ADU 1 + ADU 2 | About 1.25x |
| One ADU excluded | House + one ADU | About 0.94x |
| Both ADUs excluded | House only | Well below 1.00x |
Two takeaways. First, ADU income can lift a file across 1.00x, but only the portion the appraisal supports counts. Second, two ADUs mean more appraisal risk, not only more income. A file that depends on both ADUs to clear 1.00x is fragile.
When the number lands below 1.00x, there is a path to look at. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted. That is a separate path from programs built around a 1.00 floor, and eligibility depends on credit, reserves, and the property review.
What Makes an ADU Count, and What Takes It Out
Each ADU has to pass the same checklist before it adds to coverage.
- Permit and zoning status. The unit is legal where it sits.
- Certificate of occupancy or equivalent. Where the jurisdiction issues one.
- Habitability. A working kitchen, bath, and sleeping area, with the unit functional.
- Separation. Separate access and, where applicable, separate meters. These also feed the classification question.
- Comparable support. The appraiser can document similar rentals.
Miss one and the unit may drop out. A missing comp is a quieter failure than a missing permit. Even a fully permitted ADU may add nothing if the appraiser cannot document similar rentals nearby, and in areas with few ADUs this happens.
Edge Cases Where the General Rule Breaks
Unpermitted second ADU. One ADU may count while the second does not. Plan for the excluded-unit version of the math, because that is the version that has to work.
An ADU split into two units. Splitting a space after the fact often creates a permit and utility problem. It may also push the classification toward 2–4 units.
No ADU comps nearby. The unit can be real and legal and still add nothing to rent used for program review. No neutral source quantifies how often this happens, so treat it as a risk to price in, not a number.
Vacant or new ADU. Market rent from the appraisal usually carries the unit, since there is no lease to review.
Owner occupancy. DSCR loans are for non-owner-occupied investment property. Living in the house or in an ADU generally changes the loan type.
Short-term rental ADUs. Form 1007 documents monthly rent only. Nightly income is documented separately. 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. Network guidelines for short-term rentals are tighter than for long-term rentals: purchase leverage tops out at 75%, and cash-out is around 70% on short-term-rental collateral. Expect a 640+ score and about 12 months of hosting history.
Agency caps do not carry over. FHA guidelines cap ADU income at a share of the borrower’s qualifying income. DSCR files have no borrower income to cap against. How a DSCR program limits ADU income, if at all, is set by the program.
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.
How Many ADUs Can Count?
It varies by lender and program. Some programs count one ADU. Some count more. Some require the ADU to appear on the appraisal’s rent schedule as its own line. That is why the question belongs in the first call, before contract.
Across the network, the program parameters that frame the rest of the file look like this, subject to lender guidelines:
- Purchase leverage: most files land at 75%–80% LTV on an investment property purchase. Select high-leverage programs reach 85% LTV with roughly a 700+ score.
- Cash-out refinance: around 75% LTV on standard rentals, with about 6 months of seasoning as the common expectation.
- Credit: a 620 floor exists in parts of the network, most programs want around 660, and 700+ opens the strongest leverage tiers.
- Reserves: commonly around 6 months of PITIA, stepping up to about 9 months on loans above $1,500,000. Conservative rate-term files at modest leverage under that size can see reserves waived.
- Loan size: up to $3,000,000 on standard programs. Smaller balances route through select lenders.
A larger down payment lowers the payment and can lift coverage. It does not erase leverage caps, credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage. Lendmire’s piece Can Rent From Two ADUs on One House Count for a DSCR Loan? covers the narrower counting question in more detail.
DSCR compares rent to PITIA only. Clearing 1.00x is not positive cash flow. Repairs, vacancy, management, utilities, and capex sit outside the calculation, and two small units can carry more turnover and upkeep than one large lease.
Documentation That Keeps the File Clean
Most ADU files stall on paper, not on math. Gather these before the appraisal is ordered:
- Permit history and final sign-offs for each ADU
- Certificate of occupancy or the local equivalent
- Floor plans and photos showing each unit as a complete dwelling
- Current leases for occupied units
- Utility documentation showing which meters serve which unit
- Build-cost records for any recent construction
- A short written summary of the legal status of each unit
Hand the appraiser the legal-use proof and the lease evidence together. A reconsideration request later is harder if the first report never saw the permits.
What the Investor Decision Looks Like
Before going under contract, ask the lender four questions. How many ADUs count? Are permits required for each? Which appraisal form and rent documents are expected? What happens to an unpermitted unit?
Then underwrite the version of the deal where the weakest ADU is excluded. If the property still clears the program’s coverage floor at the leverage you want, the file is strong. If it only works with every unit counted, treat it as a stretch and budget the appraisal accordingly.
Properties on manufactured homes, log homes, and barndominiums are not offered in these programs, so an ADU cannot rescue that collateral type.
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. Reach the team at 828-256-2183 or request a quote. Tax treatment varies; consult a qualified professional.
Frequently Asked Questions
Can a DSCR loan close with vacant ADUs?
It depends on the program. Vacant, permitted ADUs are typically credited at the appraiser’s market rent. Some programs treat a heavily vacant building as unleased and want lease evidence first. Ask before contract.
Does an ADU add to the unit count?
Sometimes. If the appraiser classifies the property as a 2–4 unit property, each unit gets its own rent line and the form changes to Form 1025. If it stays a single-family home with ADUs, it is reported on the one-unit form. Classification can also affect program eligibility.
What if the appraiser cannot find ADU comparables?
The ADU may add little or no rent used for eligibility review even if it is legal. Documentation helps: leases, build-cost records, and proof of legality give the appraiser more to work with. Underwrite the deal without that rent if comps are scarce where you are.
Does an unpermitted ADU hurt value and income?
It usually adds neither. Lenders are conservative about space the jurisdiction does not recognize, so the unit is typically flagged and left out of both value and rent used for the lender’s review.
Can I use my own pro forma rent for an ADU?
Not as the coverage figure. The appraisal’s rent conclusion sets rent used for financing review, and a pro forma is useful only as a planning input. Underwrite on what the appraiser is likely to support.
For current guidelines and terms, see Lendmire’s DSCR loan programs page.
About Lendmire
As a non-QM mortgage broker (NMLS# 2371349), Lendmire facilitates DSCR investor loans across 41 markets, including Washington, D.C. DSCR eligibility is generally reviewed around property-level rental income instead of personal income documentation, subject to lender guidelines, serving LLC-structured portfolios and self-employed borrowers who don’t fit conventional boxes. A two-time Scotsman Guide Top Mortgage Workplace (2025, 2026).
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References
1. Working RE — When Is Single-Family a Multi-Family Appraisal?
2. McKissock — Form 1007 and Its Impact on Short-Term Rental Appraisals
3. Fannie Mae Selling Guide B2-3-04
4. Oregon DEQ — A Practitioner’s Guide to Appraising ADUs
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Portfolio DSCR Loan Requirements to Buy Out Siblings or a Partner · How to Scale Rentals With ADU Rent on a DSCR Loan as a W-2 Investor · Portfolio DSCR Loan Requirements After Seller Financing or Subject-to
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Required disclosures. Lendmire (NMLS# 2371349) operates as a licensed mortgage broker, not a direct lender or depository. The discussion in this article is general in nature and should not be relied upon as financial, legal, or tax advice — every investment scenario is unique and should be reviewed by a qualified professional. Any loan inquiry is subject to lender underwriting, and this article is not a commitment to lend or a guarantee of approval. Mortgage rates, loan terms, and program guidelines vary by borrower, property, and state, and may change without notice. Equal Housing Opportunity. Verify licensure at NMLS Consumer Access.