The Quick Read: permit status decides whether the extra unit adds to your home’s appraised value or sits on the report as a flagged risk. An ADU, or accessory dwelling unit, is a second living space on the same lot, such as a garage apartment or a basement suite. A permitted ADU is the better fit for a cash-out refinance, because the appraiser can count it. An unpermitted one is for borrowers who accept that it may add little or nothing and who can still use the equity in the main house. A low first mortgage adds a second question. A cash-out replaces that whole loan, not just the new cash.
Key Takeaways
- The loan-to-value cap on a conventional cash-out for a one-unit primary home is 80%. Permit status changes the value that cap applies to.
- An unpermitted ADU does not automatically block a loan. It can narrow the programs, add conditions, and lower the value credit.
- A cash-out pays off your existing first mortgage. A low one is the main reason to look at alternatives.
- The honest answer depends on three numbers: your equity, your current loan terms, and what the appraiser will credit.
Lendmire’s cash-out refinance programs are the starting point for the numbers below. Every figure is subject to lender guidelines and full file review. None of it is a commitment to lend.
Cash-out refinance estimate
The starting figures are an example value with a balance and a cash request in proportion. Replace them with yours.
Editable benchmark: 7.40% as of October 15, 2026 · Freddie Mac 30-year average via FRED®. A conventional market reference, not a cash-out refinance quote.
Illustrative starting assumptions: a $350,000 home value, a $193,000 current balance, the agency cap on a one-unit principal residence, a thirty-year term at the current Freddie Mac benchmark, and property taxes and insurance estimated at typical national rates. Every field is editable.
Illustrative estimate only — not a Loan Estimate, approval, quote, or commitment to lend. The rate field carries the weekly Freddie Mac thirty-year conventional benchmark, a market reference and not a cash-out refinance quote; a cash-out loan is priced by the lender at lock. The cash available is the loan the program cap allows less the balances paid off, before closing costs, which are not included. The HELOC line is the program’s combined loan-to-value ceiling applied to the same value and balance. Taxes and insurance are editable estimates. Licensed in sixteen states for consumer mortgages.
Side-by-Side
The table shows how the two situations compare on a conventional cash-out of a one-unit primary home. Wholesale lenders set their own overlays, so some files differ.
| Factor | Permitted ADU | Unpermitted ADU |
|---|---|---|
| Leverage | Up to 80% of value | Same cap, but ADU value may not count |
| Credit floor | 620 decision score to start | Same floor; overlays may add more |
| Mortgage insurance | None at 80% or below | Same, but a lower value shifts the ratio |
| Occupancy | Primary residence | Primary residence; some programs add limits |
| Documentation | Permit and zoning records | Appraisal flags status; insurance checked |
| Value credit | Comparable sales can support it | Harder to support |
| Rental income | Depends on the program | Depends on the program; often not counted |
Read the first row carefully. The cap is the same percentage in both columns. The difference sits in the value the percentage is applied to.
Key Terms Defined
Legal non-conforming: an ADU that predates today’s zoning rules and is allowed to stay. The agencies treat it as legal.
Loan-to-value (LTV): the new loan divided by the appraised value of the home.
Cash-out refinance: a new first mortgage that pays off the old one and hands you the extra cash.
Seasoning: the waiting period a lender wants before a refinance. On a conventional cash-out, the mortgage being paid off must be at least 12 months old, and a borrower must be on title for 6 months. Exceptions exist for delayed financing, inheritance, and legal awards.
Comparable sales: recent sales of similar homes the appraiser uses to support a value.
Net tangible benefit: the test that an FHA Streamline or VA streamline refinance must leave you better off in a measurable way.
What “Permitted” Actually Means to a Lender
Zoning status and building-permit status are two separate questions. Lenders mostly ask the zoning one.
Fannie Mae’s Selling Guide defines an ADU as extra living area that is independent of the main home. It needs its own entrance, kitchen, sleeping area, and bathroom, and it must sit on the same parcel. A property with one main home and one ADU is classed as one-unit. Utility meters, a separate mailing address, and whether the unit can legally be rented can push it toward a two- to four-unit classification. That matters, because the leverage cap on a cash-out drops to 75% for two- to four-unit principal residences.
The same guide treats an ADU as legal when the current zoning code allows it. A grandfathered unit counts too.
Freddie Mac’s ADU page adds that a one-unit home whose ADU breaks zoning may still be eligible if extra conditions are met.
Here is the practical read. An unpermitted ADU is not an automatic “no” on a one-unit home. It is a “maybe, with conditions.” Those conditions usually involve how the appraiser reports the unit, whether comparable sales exist for the same use, and whether the insurer will cover it.
One caution. The agencies speak mostly about zoning. A missing building permit is a separate issue, and the rules on it are less clear. Ask the lender early how it treats the specific gap in your file.
When a Permitted ADU Is the Better Fit
A permitted ADU is the better fit when you want the loan to count the unit. Three situations point that way.
You need the full value credit. The appraiser reports the ADU and looks for sales of homes with the same use. The appraiser weighs zoning, land use, the unit’s usefulness, and the property’s highest and best use. A permitted unit gives that work something solid to stand on.
Your equity is thin. Cash-out proceeds depend on value times the leverage cap, minus what you owe. Extra value credit can add real room.
You want a cleaner file. A permitted unit means fewer questions at underwriting and fewer conditions about insurance.
Run a modeled example. These are assumed inputs, not market data, and they use no dollars. Call the home’s value without any ADU credit 100 points. Say you owe 40 points on your first mortgage. Say a permitted ADU may support a higher appraised value, depending on comps and underwriter review, and assume for this illustration that the appraisal credits it at 110 points.
| Item | ADU not credited | ADU credited |
|---|---|---|
| Appraised value | 100 points | 110 points |
| Maximum loan at 80% | 80 points | 88 points |
| Existing first mortgage | 40 points | 40 points |
| Cash before costs | 40 points | 48 points |
The credited unit adds 8 points of cash, a gain of about a fifth. Closing costs come out of both columns. Scale the example to your own numbers with your loan officer.
There is a limit on the upside. A wholesale lane reaches 89.99% loan-to-value with no mortgage insurance at a 680 score and a 50% ratio. It requires a thirty-year fixed loan on a primary residence with a conforming balance, plus its own six months of seasoning. A permitted ADU can lift the value that percentage works on. Whether the unit helps on that lane depends on how the appraiser reports it and the lender’s overlays.
When an Unpermitted ADU Is the Better Fit
This heading is not a recommendation to skip permits. It describes the cases where the unit’s status does not change the right loan.
The ADU is not why you are refinancing. If the equity in the main house covers what you need, an appraiser who gives the unit little credit changes less than you would think. You can ask for the loan on the strength of the house.
Legalizing would cost more than it returns. Retroactive permitting can mean inspections and corrections. If the cash you want is modest, spending on legalization first may not pay off. Local rules vary widely, so check with your building department.
You will not rely on the rent. Whether ADU rent counts as qualifying income depends on the program. For an unpermitted unit, plan as if it will not count. Qualify on your own income instead.
You are already in a government loan and do not need cash. An FHA Streamline needs an existing FHA loan that is current, and HUD’s Streamline page limits cash back to a small amount. A VA IRRRL requires an existing VA loan. Neither requires a full new appraisal, so permit status is not tested. Neither delivers meaningful cash either.
If your unit is unpermitted and you want cash, the realistic paths are these:
1. Legalize the unit first, then refinance.
2. Refinance on the house alone and accept little or no ADU credit.
3. Keep the first mortgage and borrow against equity another way.
4. Wait until the file is stronger.
The right answer depends on your equity and your first mortgage. That brings us to the bigger decision.
The Low First Mortgage Problem
A cash-out refinance replaces your first mortgage. The terms you have now go away, however good they are. That is the central trade-off, and it matters more than permit status for many borrowers.
Think about the mechanics. If your balance is modest and your current loan is strong, a cash-out re-prices the whole balance to get cash that may be a smaller piece. A mortgage that works well for you can be swapped for one that does not.
That is why many homeowners with a low first mortgage look at a second lien, such as a home equity line or loan, that leaves the first mortgage alone. Lendmire’s piece comparing a HELOC and a cash-out refinance for an ADU with a low first mortgage walks through that choice. For a different route that keeps the first loan, see Lendmire’s explanation of how resubordination compares to a cash-out refinance.
Here is a fair way to weigh it.
- Cash-out leans right when you need a large sum, your current loan is not especially strong, or you want one payment.
- A second lien leans right when your first mortgage is strong, you need a smaller amount, or the ADU status complicates a full refinance.
- Waiting leans right when a legalization project or a seasoning clock would improve the file.
A second lien has its own risk. The home is collateral. The CFPB’s home equity guide states that the loan must be repaid and that missed payments could mean foreclosure. That applies to a cash-out too.
Across the wholesale programs a broker places files with, the low-first-mortgage borrower often arrives focused on the ADU. The better first question is often whether to disturb the first mortgage at all. Permit status can be solved later. A first mortgage you give up is gone.
How the Appraisal Works From Your Side
Here is the sequence, step by step.
1. You disclose the ADU on the application. Hiding it is a bad idea. The appraiser will find it.
2. The appraiser classes the property. The count of units comes from utilities, address, and whether the unit can legally be rented.
3. The appraiser reports zoning status. The report calls it legal, legal non-conforming, or non-compliant.
4. The appraiser looks for comparable sales with the same use. Support is harder when the unit is non-compliant.
5. Underwriting reviews the report. For a non-compliant unit, the lender typically checks whether insurance will still cover the home.
6. You get a copy. Under the CFPB’s appraisal rule, the lender must notify you promptly after your application that you can receive a copy of the appraisal. Timing varies by file and lender. The copy is at no extra charge, although you pay a reasonable fee for the appraisal itself.
Read the report when it arrives. If it flags the ADU, ask what the lender will accept before you pay for anything more.
Before You Apply: A Checklist
- Find the permit history for the ADU at your local building department.
- Ask the zoning office whether the unit is allowed, grandfathered, or non-compliant.
- Confirm whether the unit has its own entrance, kitchen, bathroom, and utility meters.
- Ask your insurer in writing whether the unit is covered.
- Know your first mortgage balance, and how long ago it started.
- Check how long you have been on title.
- Decide how much cash you need and whether it is worth replacing your first mortgage.
The Verdict
Choose a permitted ADU path when value credit matters, your equity is tight, and you want a clean file. Choose to proceed with an unpermitted ADU only when the house carries the loan on its own and you are fine with the unit adding little. Either way, put the low first mortgage first. For many homeowners, the better question is not permitted versus unpermitted. It is whether a cash-out is worth giving up the loan you already have.
If you are weighing a cash-out refinance against keeping the loan you have, Lendmire can help you compare the programs and the equity each one reaches.
Frequently Asked Questions
Can I get a cash-out refinance with an unpermitted ADU?
Sometimes. On a one-unit home, agency guidelines leave a conditional path for a unit that breaks zoning. Expect an appraisal that reports the status, a hunt for similar sales, and an insurance check. Lender overlays can be stricter than the agencies, and approval is subject to full file review.
Will an unpermitted ADU lower my appraisal?
It may not add value, and it can make the value harder to support. The appraiser must report the unit. Comparable sales for the same use are harder to find when the unit is non-compliant. The main house is still valued.
Does ADU rent count toward qualifying?
It depends on the program. Plan on qualifying with your own income, especially if the unit is unpermitted. Ask your loan officer how the specific program treats the rent before you count on it.
Is a cash-out the only way to get cash from an ADU home with a low first mortgage?
No. A home equity line or loan leaves the first mortgage in place. A cash-out replaces the whole loan. The better choice depends on how much you need and how strong your current loan is.
Can an FHA Streamline or VA IRRRL pull cash out?
Not in a meaningful amount. An FHA Streamline needs an existing FHA loan and allows only a small amount of cash back. A VA IRRRL refinances an existing VA loan. Neither is a cash-out product, and permit status is generally not tested because no full appraisal is needed.
For current guidelines and terms, see Lendmire’s refinance programs page.
About Lendmire
As a mortgage broker (NMLS# 2371349), Lendmire helps homeowners and home buyers in 16 states with FHA, VA, conventional and jumbo purchase and refinance loans arranged through wholesale lenders. Lendmire is never the lender; program terms are set by the lender and the agency guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
For your own numbers, request a scenario review with Lendmire.
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References
1. Fannie Mae Selling Guide: Special Property Eligibility Considerations (B2-3-04)
2. Freddie Mac: Accessory Dwelling Units
3. HUD: FHA Single Family Streamline
4. CFPB: Using Your Home Equity Guide
5. CFPB: ECOA Appraisals Rule Summary
This article is part of Lendmire’s cash-out refinance program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How Mortgage Insurance Changes a Cash-Out Refinance Payment · Can You Roll Mortgage Insurance Into a Cash-Out Refinance Loan Balance? · How to Compare Cash-Out Refinance Offers on a Low First Mortgage
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.