The Quick Read: This kind of refinance sizes a new first loan on what the property is worth and earns today, not on what an addition or ADU might add later, so the typical requirements are about 12 months of hosting history, a 640 credit score, 1.00 coverage on the new payment, and leverage up to 70% on short-term-rental collateral. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.
- Cash-out proceeds arrive at settlement. They do not fund draws as the build progresses.
- The lender’s appraisal sets value, and the new space counts only if it exists and is permitted at appraisal.
- Coverage is tested on the full new balance, so the larger loan has to pass on its own.
- Reserves and seasoning vary by lender, leverage, and loan size.
- All figures are typical ranges from select wholesale-network guidelines, subject to lender guidelines and not a commitment to lend.
What Does a Cash-Out Refinance Actually Do for a Build?
A cash-out refinance replaces your current first loan with a larger one and hands you the difference. It lends against value that already exists. It does not finance construction.
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That one fact drives everything else. If you refinance before the work, the appraiser values the property as it stands. The addition or ADU you plan is not in that number. If you refinance after the work, the new space can be part of the value, provided it is finished, permitted, and supported by comparable sales.
The after-repair value you project is a planning number. It helps you decide whether the project makes sense. It is not an underwriting input. Brokers see files go sideways when an investor sizes the construction budget on the cash-out they hope to get after the build, instead of the cash-out the file supports today.
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 loans work, see the complete DSCR loans guide.
Key Terms Defined
Cash-out refinance: a new first loan that pays off the old one and returns the leftover equity to you as cash.
DSCR (debt service coverage ratio): monthly rent used for review divided by the full monthly payment of principal, interest, taxes, insurance, and any HOA dues.
Seasoning: the minimum time you must own the property before a lender allows cash-out, documented by the settlement statement.
Hosting history: the record of guest bookings and income that shows the property operates as a short-term rental.
ADU (accessory dwelling unit): a small, separate living unit on the same lot as the main home, such as a backyard cottage or a converted garage.
Holdback: a portion of proceeds a lender may withhold at settlement for a specific purpose.
What Are the Requirements on a Short-Term Rental Cash-Out?
On most files, the network’s short-term-rental cash-out terms look like the table below. Each number is a typical range. Lenders differ, and every file is reviewed individually.
| Requirement | Typical range | What it means for a build |
|---|---|---|
| Cash-out leverage | Up to 70% LTV on STR collateral | Caps proceeds against as-is value |
| Credit score | 640 and up | Higher scores open better leverage |
| Coverage on a refinance | 1.00 | Tested on the new, larger payment |
| Hosting history | About 12 months | New space has none of its own |
| Loan size | Up to $3,000,000 | Standard programs |
| Reserves | Varies by lender and size | Spent cash can’t count as reserves |
| Seasoning | Varies by lender | Recent buyers may have to wait |
A few notes on the table. The 70% ceiling applies to short-term-rental collateral. Standard long-term rentals can reach up to 75% on a cash-out, so converting to short-term use can lower proceeds even while gross income rises. The 1.00 coverage figure is where select programs start on a short-term-rental refinance. A separate select-lender path goes below 1.00, with leverage and terms adjusted. Purchases of short-term rentals carry a different coverage floor, so don’t carry refinance numbers over to a purchase.
For the same project under a renovation scope, Lendmire’s piece Short-Term Rental Cash-Out Refinance Requirements for a Renovation or ADU covers the neighboring ground.
How Does Underwriting Treat the Build? Step by Step
Here is the order a file moves through, and where it tends to stall.
1. Settle the sequence. Decide whether you refinance before the build, after it, or both. The next section compares the three paths. Everything else follows from this choice.
2. Confirm the space is legal and permitted. Permit status is the first gate for value and for rent being counted. Unpermitted space often gets little or no value. 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. An ADU that cannot be rented short-term changes the income plan entirely.
3. Lender orders the appraisal. The appraiser does not add your construction cost to the value. An ADU or addition is valued mainly through comparable sales of homes with similar space. Guidance from the Appraisal Institute, as summarized by the Casita Coalition, says the cost approach can supplement the sales comparison approach. It also says the income approach is most useful when the owner intends to rent the unit, with caveats. An improvement may support a higher appraised value, depending on comps and underwriter review.
4. Document the income. For a short-term rental, lenders want about 12 months of hosting history on the property. A newly built unit has none. In practice the file leans on the main house’s existing history, a market-data projection, or an appraiser’s narrative. Each is reviewed on the lender’s terms.
5. Test the loan at the lower of two limits. One limit is value: appraised value times the cash-out leverage cap. The other is coverage: the rent used for review has to cover the full payment on the new balance. Whichever is smaller sizes the loan.
6. Net out the proceeds. Cash to you is the new loan minus the payoff of the old loan, closing costs, and any holdbacks. The new terms apply to the whole balance, not just the new cash. That is why coverage can tighten even when income is steady.
7. Clear reserves and seasoning as separate gates. Both are set by the program. Reserves vary by lender, leverage, and loan size. If the build drains your cash before the refinance, the file may have nothing left to show.
Worked Example: Where Net Cash Falls Short
Run the numbers on percentages of value, using modeled assumptions rather than market data. Say the property appraises at 100% of its as-is value. The existing loan balance sits at 45% of that value. A 70% cash-out cap leaves 25% of value available before closing costs and any holdbacks come out. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
Now say the build budget runs 30% of appraised value. The refinance leaves a gap of at least 5 points, before costs. You’d fund that gap with cash, a second source, or a smaller scope. A low appraisal widens it. Leverage magnifies a miss, so a small shortfall in value can erase far more than its own size from the proceeds.
Then the coverage test. Say the property covered its old payment at 1.35x. A larger balance can pull that toward 1.10x or lower. It still clears the 1.00 floor in this example. But a file that starts near 1.05x may not survive the larger balance. If coverage falls below 1.00, select lenders in the network can look at sub-1.00 files, with leverage and terms adjusted.
One more point. Clearing 1.00 does not mean positive cash flow. The ratio compares rent to the housing payment only. Repairs, vacancy, management, utilities, cleaning, and capital costs sit outside it. A short-term rental carries more of those costs than a standard lease does.
Refinance Before, After, or Both?
Three structures show up on these files. None is right for everyone.
| Sequence | What the appraisal sees | Main risk |
|---|---|---|
| Refinance first, then build | Property as it stands today | Proceeds may not cover the budget |
| Build first, then refinance | Completed, permitted space | Cash must fund the build up front |
| Both, in two steps | Today’s value, then finished value | Two appraisals and two sets of costs |
Refinance first. You take the cash-out against today’s value and use it for construction. The risk is that the proceeds fall short, and the payment on the larger balance has to pass coverage before any new income exists. During construction, the new space earns nothing, and the main house may lose bookings.
Build first. You fund construction with other capital, then refinance once the space is complete. This is the cleanest path for appraisal. The completed unit is in the value, and the file can show income. The cost is that your cash is tied up in the build, and you still need enough left to meet reserves. Cash spent on construction can’t double as reserves.
Both. Some investors refinance for the build and refinance again after lease-up. It can work, but each loan means a new appraisal, new closing costs, and a new seasoning and coverage test. Check whether the first loan carries any prepayment terms before you plan on a second one. This is a genuine toss-up for many investors. The second refinance can reset value in your favor, but only if the appraisal cooperates.
Where the General Rule Breaks
The rule is simple: value counts only if it exists. These are the cases that bend or break it.
The appraisal misses the work. ADU comparable sales are thin in many neighborhoods, so adjustments get large. Research from the Runstad Center at the University of Washington, summarized by Working RE, found that estimates of the contributory value of the same permitted ADU ranged from $10,000 to $100,000. It also found that income-approach values ran above actual sale prices, by 7.2% or 9.8% on average depending on the formula. Cost is not value, and the appraisal range can be wide. A reconsideration request needs recent in-neighborhood sales with similar space, not a contractor’s invoice.
The unpermitted conversion. A garage or basement converted without permits may get little or no value and no counted rent. Appraisers don’t enforce code. But the market and the underwriter treat the space differently when it isn’t legal. Often the credit is none.
The rent-schedule fallback. Appraisers use a single-family rent schedule called Form 1007. It measures monthly long-term market rent, not nightly rates. McKissock says the form is not designed for nightly rent or business income, and that the lender decides how income is treated. HousingWire reports the form was built only to estimate long-term rent and cannot capture seasonality, cleaning, management, or local rules. The Fannie Mae short-term-rental explainer hosted by the Nevada Real Estate Division confirms the form calls for indicated monthly market rent. That agency material is a contrast point only. It does not govern DSCR files. When a file falls back to a long-term rent figure, the coverage ratio can run lower than the property actually earns.
Existing second liens. If a second loan helped fund early work, it gets paid at the refinance. That reduces your net proceeds.
Ineligible structures. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs. If the plan is a barndominium-style addition, this route is closed.
Products that look past today’s value. A few lenders may offer niche products that consider projected value after repairs. Treat them as exceptions to confirm file by file. The standard cash-out sizes on the value that exists at appraisal.
What Does the Investor Decision Look Like?
Start with the budget, not the cash-out. Work out what the build costs, what cash you can commit, and what the property supports today at 70% leverage on short-term-rental collateral. If the gap between the two is wide, build first or scale down. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.
Next, check the income plan. A new ADU may not be rentable short-term where you are. If it has to be a long-term lease, the income looks different, and so does the case for building it. The numbers have to work on the rent you can legally and realistically collect.
Then check coverage on the new balance. Don’t assume yesterday’s ratio survives. Credit also matters: 640 is a floor, and stronger scores open better leverage tiers across the network.
Last, keep a cash cushion. Overruns are common, and a file that has to be fixed at settlement has little room. Tax treatment varies; consult a qualified professional.
Frequently Asked Questions
Can I use a cash-out refinance to build an ADU on a short-term rental?
Yes, but the loan is sized on the property as it stands at appraisal, not on the planned ADU. Proceeds come as a lump sum at settlement. Typical terms on short-term-rental collateral are up to 70% leverage, a 640 credit score, 1.00 coverage, and about 12 months of hosting history, subject to lender guidelines.
Will the lender count rent from an ADU that isn’t built yet?
Generally not. A planned unit has no history and may not be in the appraised value. Income is usually documented from the existing property’s history, a market-data projection, or an appraiser’s narrative, depending on the lender. Once the unit is finished and operating, a later refinance can use it.
Does the appraiser value my Airbnb income?
No. The appraiser values the real estate. The lender decides how income is treated. The standard rent schedule measures monthly long-term rent, so a nightly-rate operation is usually documented through hosting history and market data instead.
Is it better to refinance before or after the build?
After gives the cleanest appraisal because the finished space is in the value, but it ties up your own cash first. Before gives you funds sooner but values only today’s property. The better choice depends on how much cash you can commit and whether the new payment still clears coverage.
What if my short-term rental has less than 12 months of history?
Hosting history of about 12 months is the typical expectation. A property with a shorter record may need a different income method or a different program, and select lenders in the network review these case by case.
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 mortgage broker that arranges these loans through select lenders in its wholesale network, covering 41 markets, including Washington, D.C. An illustrative calculator on the site can give a rough sense of coverage before you apply.
About Lendmire
A DSCR-focused mortgage broker, Lendmire (NMLS# 2371349) places investor financing across 41 markets — 40 states plus Washington, D.C. — with DSCR eligibility generally reviewed by the lender on property cash flow instead of tax returns, subject to lender guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in 2025 and 2026.
Investors weighing their equity options can start with Lendmire’s guide to cash-out refinance on an investment property.
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References
1. Casita Coalition: Insight from the Appraisal Institute on Evaluating ADUs
2. Working RE: Granny Flats Undervalued
3. McKissock: Form 1007 and Its Impact on Short-Term Rental Appraisals
4. HousingWire: Short-Term Rentals Are Breaking the Appraisal Playbook
5. Nevada Real Estate Division: Short-Term Rentals explainer
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: Best Short-Term Rental Cash-Out Refinance Program for Repairs Without a Contractor
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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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.