The Quick Read: Across most programs in Lendmire’s wholesale network, the amount you can pull out is a 75% loan-to-value ceiling on the appraised value, minus your payoff and costs, and the ADU only helps to the extent the appraiser credits it in value and the lender counts its rent in the coverage test, subject to lender guidelines. Build cost does not set the number. The appraisal does.
- Cash-out on a standard rental generally tops out at 75% LTV, with about 6 months of ownership expected.
- An ADU can raise your value, your rent, both, or neither. It depends on the appraisal and the program.
- A bigger loan means a bigger payment, so cash and rent coverage pull against each other.
- Permits and legal status often decide whether the ADU counts at all.
- Reserves and closing costs shrink the cash that actually lands in your account.
What Actually Sets the Cash-Out Amount on an ADU Property?
Three things set it: the appraised value, the leverage cap, and the rent-to-payment test. The ADU touches the first and the third. It never touches the cap.
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An ADU is an accessory dwelling unit. It is a second, smaller living space on the same lot as the main home, such as a garage conversion, a backyard cottage, or a basement apartment. Many investors assume it works like a bonus unit that adds value and rent in a straight line. Underwriting does not see it that way.
The formula is plain. Take the appraised value, multiply by the maximum LTV, and subtract what you still owe. That is your gross cash. Then subtract closing costs and any reserves the lender wants you to keep. What remains is your net.
On most cash-out files across the network, the LTV ceiling is 75% on a standard long-term rental. Short-term-rental collateral is lower: cash-out tops out around 70% there. A larger down payment on an earlier purchase does not change these caps, and neither does a strong credit score. Credit can move you into better tiers, but not past the ceiling.
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. The loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. For the full picture of how these programs fit together, see the complete DSCR loans guide.
Key Terms Defined
ADU (accessory dwelling unit): A smaller, separate living space on the same parcel as the main home, with its own sleeping, cooking, and bathing areas.
LTV (loan-to-value): The new loan divided by the appraised value. A 75% LTV means the loan is three-quarters of what the appraiser says the property is worth. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.
DSCR (debt service coverage ratio): Monthly rent used for lender review divided by the full monthly payment, which covers principal, interest, taxes, insurance, and any HOA dues (PITIA). A ratio of 1.00 means rent equals the payment.
Seasoning: The ownership period a lender wants before it allows cash-out. On most files that is about 6 months from title recording.
Rent schedule: The appraiser’s opinion of market rent for the property. Many DSCR programs lean on it when there is no lease or when the lease looks off-market.
Net proceeds: Cash left after payoff, closing costs, and any reserves you must hold back.
How Does Underwriting Treat the ADU, Step by Step?
Underwriting treats the ADU as a question of evidence. Each step asks whether the unit is real, lawful, and supportable on paper. Here is the order a file usually follows.
Step 1: Define the property. An appraiser generally treats a single ADU as a feature of a one-unit property, not as a second unit. HUD’s Mortgagee Letter 2023-17 states this for a single-family home with one ADU, and it counts the extra dwelling as an additional unit once there are two or more. The word “duplex” on a listing does not change that. Appraisers also expect the ADU to be smaller than the main home, with a separate entry and its own kitchen and bath. A space reachable only through the main house is not an ADU. A unit close to the main home in size may be treated as a secondary unit and need a different appraisal form, as Working RE Magazine explains.
Step 2: Order the appraisal and rent schedule. For a one-unit property, the usual pairing is the 1004 appraisal report and the 1007 rent schedule. For two to four units, the form is the 1025. Which one a DSCR program requires is set by that program’s guidelines. Programs in the network differ here, so the form choice can change the result.
Step 3: Value the ADU. This step sets your loan ceiling, and it is the hardest one. Appraisers mostly rely on sales comparison, and ADU sales are scarce. Researchers Brown and Watkins found appraisers struggling with that method on ADU properties. When there are no ADU sales nearby, comparable homes without an ADU pull the value down. In practice, ADUs often appraise below what they cost to build. Plan around that.
Step 4: Test coverage. The lender divides rent used for lender review by the full monthly payment on the new, larger loan. Some programs add the ADU’s rent to the main home’s rent. Others count the main dwelling only. A few want a lease on the ADU, and others accept the appraiser’s market-rent opinion. Treat this as program-by-program.
Step 5: Size the loan. The lender weighs value, existing liens, credit, reserves, and coverage together. The smallest of those limits wins.
Worked Example: Same Property, Three Appraisals
Run the numbers on one rental with one ADU and three possible appraisals. These are modeled index figures, not market data. Set the value of the property without any ADU credit at 100. Assume the payoff is 60 on that same scale and the cap is 75% LTV. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.
| Appraisal result | Value | Max loan at 75% | Gross cash |
|---|---|---|---|
| ADU gets no credit | 100 | 75 | 15 |
| ADU gets modest credit | 120 | 90 | 30 |
| ADU gets strong credit | 140 | 105 | 45 |
Look at how much the appraiser’s view moves the result. Gross cash triples between the first and last rows, and nothing physical about the property changed.
Now add the coverage check. Say the file clears about 1.25x before the refinance. A bigger loan raises the principal-and-interest part of the payment roughly in proportion. Taxes and insurance stay put. In the third row, the loan is 75% larger than the payoff, so the payment climbs sharply and coverage falls toward 1.00x. In that case, coverage may bind before the LTV cap does.
Lower coverage is not automatically a dead end. A 1.00 ratio is where many select programs start. Separately, select lenders in the network offer paths below 1.00, with leverage and terms adjusted. Eligibility is subject to lender guidelines, credit approval, and property review.
A strong ratio is not a cash-flow guarantee either. DSCR compares rent to the payment only. Repairs, vacancy, management, utilities, and capital expenses all sit outside it.
What Limits Your Number First?
Run these in order, because the first limit you hit is your real ceiling.
| Order | Limit | What it controls |
|---|---|---|
| 1 | LTV cap | Maximum loan on appraised value |
| 2 | Rent coverage | Maximum payment the rent supports |
| 3 | Reserves | Cash you must keep after closing |
| 4 | Closing costs | Net cash after fees |
| 5 | Seasoning | Whether cash-out is open yet |
Seasoning acts like a gate. At about 6 months of ownership, most programs open cash-out. Before that, the options narrow. Reserves vary by lender, leverage, and loan size. They commonly run around 6 months of PITIA, and loans above $1,500,000 typically step up to about 9 months. Standard programs go up to $3,000,000, though above $2,500,000 the network generally holds to 30-year fixed structures.
Credit matters mostly for tiers. A 620 floor exists in parts of the network, most programs want around 660, and 700 or higher unlocks the strongest leverage tiers. None of that lifts the 75% ceiling.
How the ADU’s Status Changes the Math
Legal and rental status decides how the ADU gets counted. This table shows the usual direction, though programs differ.
| ADU status | Value treatment | Rent treatment |
|---|---|---|
| Permitted, leased | Credited if comps support | Often countable |
| Permitted, vacant | Credited if comps support | Market-rent opinion |
| Unpermitted | Little or no credit | Often excluded |
| Short-term rental | Same value rules | Program-specific |
Documents help more than anything. Keep the permit, any certificate of occupancy, the lease, and rent receipts together. They show the underwriter that the unit is real and lawful. Recent construction invoices help too, but invoices prove cost, not value.
Where the General Rule Breaks
Four situations bend the usual formula.
The unpermitted ADU. This is a common trap. Without permits, the appraiser may give the unit little or no value, and the lender may leave out its rent. Some investors can fix this by getting the unit permitted after the fact, which is a local process outside the loan.
No ADU comparables. When there are no sales with a similar unit, the appraiser leans on non-ADU homes and adjusts. For rent, the appraiser may use ordinary rentals with adjustments. Your number then rests on one person’s judgment. Fannie Mae’s ADU income guide describes the same practice on agency files. The agency rule is a useful reference point only, since DSCR files follow program guidelines.
Fresh construction. If you built the ADU with a construction loan or hard money and plan to refinance out, expect a gap. The appraised value may land well under what you spent. Investors who budget the refinance on build cost, not on a conservative appraisal, can end up with money trapped in the unit. That is a common reason a plan stalls.
Agency rules misapplied. Agency ADU rules sit in a different world. Fannie Mae’s Selling Guide allows ADU rental income only with a one-unit primary residence, not on an investment property. That rule has no say over a DSCR loan. It is worth knowing only because it explains why many lenders you may have talked to before said no to ADU income. The network’s programs work from their own guidelines.
Not every structure is eligible, either. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs. If the ADU is one of those building types, check eligibility before planning around it.
What About a Short-Term-Rental ADU?
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.
On the financing side, short-term-rental collateral gets tighter terms. Cash-out tops out around 70% LTV on short-term-rental collateral, against 75% on a standard rental. Expect a credit score of about 640 or higher, roughly 12 months of hosting history, and a 1.00 coverage floor on refinances. If the ADU is the part being hosted, its income history matters most. A new ADU with no history is usually underwritten on long-term market rent instead.
What Does the Investor Decision Look Like in Practice?
Start with the question the loan can answer, not the one you wish it could. Ask what the appraiser will credit. Then size the cash-out to that figure, not to build cost.
Next, check coverage on the bigger payment. If the file clears with room, the LTV cap is your limit. If it lands near 1.00x, a smaller loan may serve you better than the maximum. Some investors in that spot choose a smaller cash-out because the extra payment would erase their margin.
Then check reserves and net cash. Ask whether the cash covers your goal after costs and reserves. If you plan to use it as a down payment on the next property, the net figure is the one that matters.
A practitioner pattern worth knowing: files with an ADU often come in on the cautious side of the investor’s own estimate. The ones that go smoothly usually have permits in hand, a lease on the ADU, and a plan built on the low appraisal case. The ones that struggle are built on a high rent or value that nobody has tested.
Frequently Asked Questions
How much cash-out can I get on a rental with an ADU?
Generally up to 75% of the appraised value on a standard rental, minus your payoff and costs. The ADU raises that amount only if the appraiser credits it in value. Short-term-rental collateral caps near 70%. Your coverage ratio, reserves, and credit can all pull the number lower.
Does ADU rent count toward the DSCR test?
It depends on the program. Some count it when the unit is permitted and the appraisal supports the rent. Others count only the main dwelling. A lease or the appraiser’s rent schedule is the usual evidence. A program-by-program check before you apply avoids surprises.
Will the ADU make my property a duplex for underwriting?
Usually not. A single ADU is generally treated as part of a one-unit property, as in HUD’s policy letter. Appraisers also do not comp it as a duplex. The label affects which appraisal form is used and how comparable sales are chosen.
What if the ADU is unpermitted?
Expect little or no credit for its value, and its rent may be left out. Some programs may still review the file on the main dwelling alone. Getting the unit permitted first often changes the outcome, which makes it worth pursuing before you apply.
Can I refinance right after building the ADU?
Cash-out typically needs about 6 months of ownership, measured from title recording, though that clock runs from the purchase, not the build. The bigger issue is value. A new ADU often appraises below its cost, so the refinance may not recover your spend.
Next Steps
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. As a broker, Lendmire arranges financing through select lenders in its wholesale network, across 41 markets including Washington, D.C. Program terms change, every file is underwritten individually, and nothing here is a commitment to lend.
For how equity extraction works on an investment property, see Lendmire’s guide to cash-out refinance on an investment property.
About Lendmire
A non-QM mortgage broker (NMLS# 2371349), Lendmire arranges DSCR financing for real estate investors in 41 markets — 40 states plus Washington, D.C. Because deals are underwritten primarily on property cash flow rather than personal income documentation, the structure suits self-employed buyers and entity-owned portfolios. Lendmire places loans through wholesale investor lenders; it is not a direct lender. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. HUD Mortgagee Letter 2023-17
2. Working RE Magazine, ADU appraisal coverage
3. Brown and Watkins, Understanding and Appraising Properties with Accessory Dwelling Units
4. Fannie Mae’s ADU income guide
This article is part of Lendmire’s investment property cash-out refinance program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Delayed Financing vs Seasoning on a Rental Cash-Out Refinance · How a Lender Reads a Recent Quitclaim on a Rental Cash-Out Refinance · Does ADU Rent Increase the Cash-Out Refinance on a Rental?
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.