The Quick Read: The lender underwrites the house you own today, not the backyard unit you plan to build. Your current income, credit and the home’s current appraised value decide the loan. The cash arrives as a lump sum at closing, and the future unit’s rent or value does not raise your limit.
- The new loan is capped at 80% of the appraised value, and that cap covers the payoff, financed costs and your cash.
- You must have owned and lived in the home for 12 months before the case number is assigned.
- Projected rent from the unit generally cannot help you qualify on a cash-out.
- No one oversees the construction draws, so permits, budget and contractor are your job.
- A different FHA product, the 203(k), is built for construction and fits attached units rather than detached ones.
Key Terms Defined
Accessory dwelling unit (ADU): a separate, smaller living space on the same lot as your main home. It has its own entrance and basic living facilities, and it can be attached, built inside the house or detached.
Cash-out refinance: a new first mortgage that pays off the old one and hands you the leftover equity as cash.
Adjusted value: the appraised value the lender uses to apply its loan cap.
Effective income: the documented income a lender is allowed to count when it tests your payment.
Combined loan-to-value (CLTV): your first mortgage plus any second loan, divided by the home’s value.
Reserves: savings left after closing that a lender may require as a cushion.
FHA cash-out estimate
Seeded with an example value, a balance to match, and a round cash request; change any field.
Editable benchmark: 7.18% as of November 5, 2026 · Freddie Mac 30-year average via FRED®. A conventional market reference, not an FHA cash-out refinance quote.
Illustrative starting assumptions: a $350,000 home value, a $193,000 current balance, the FHA cap on a principal residence with the upfront premium financed, a thirty-year term at the current Freddie Mac benchmark, and property taxes and insurance estimated at typical national rates. Every field is editable.
An illustration, not a Loan Estimate, an approval, a quote, or a commitment to lend. The rate shown is the weekly Freddie Mac thirty-year conventional benchmark, used as a market reference; an FHA cash-out is priced by the lender at lock, and this is not an FHA cash-out refinance quote. HUD’s cap limits the base loan; the upfront premium is financed on top of the capped base loan; the monthly premium for the first year follows the snapshot’s schedule. Cash available means the base loan the cap permits less the balances retired, before closing costs, which this calculator leaves out. The line figure applies the line program’s combined loan-to-value ceiling to the same value and balance. Taxes and insurance are estimates you can edit. Licensed in sixteen states for consumer mortgages.
What Is This Loan, Exactly?
An FHA cash-out refinance swaps your current mortgage for a bigger one. The difference becomes cash you can spend on anything. Across the wholesale programs we place FHA files with, the cash-out is capped at 80% loan-to-value (LTV) on a home you have owned and lived in for 12 months before the case number is assigned. The case number is the FHA tracking number that starts the file.
Here the focus is narrower: how an underwriter treats the plan to build an ADU.
The loan does not know what you spend the cash on. Nothing about it is labeled “construction.” The lender has no draw schedule, no inspector and no escrow account for the project. It is a standard cash-out that you happen to be spending on a unit.
How Is the File Underwritten, Step by Step?
Underwriters work through the same sequence on every FHA cash-out. The ADU does not add a step. It mostly changes what you can’t count.
1. Eligibility screen. The home must be your principal residence, and you must have owned and occupied it for 12 months before the case number. The clock runs backward from the case number, not forward from closing.
2. Payment history. Lenders review how you have paid the current mortgage. Many want a clean recent record, and exact expectations vary by lender.
3. Credit. Across the wholesale programs we place FHA loans with, the starting decision score is 580. FHA’s own rules allow a lower tier with a bigger minimum investment, but the lenders in this network do not reach below 580. Some lenders set a higher floor.
4. Income and ratios. The underwriter totals your documented income and tests two ratios. The housing ratio compares the new housing payment to income. The total ratio adds your other monthly debts. The base pair is 31/43 with no compensating factors. Documented strengths such as savings or a long job history can stretch that toward 40/50 at the top tier. An automated finding governs most files.
5. Appraisal. The appraisal sets the adjusted value, and the 80% cap applies to that number.
6. Loan sizing. The lender adds your payoff, any financed costs and the cash you want. The total cannot exceed the cap.
7. Conditions and closing. The underwriter lists what is still needed. You clear those items, and the loan is documented under the usual Loan Estimate and Closing Disclosure rules.
All of this is subject to lender guidelines and a full file review. Nothing here is a commitment to lend.
What Does the Underwriter Check, and What Proves It?
| What the underwriter checks | What typically proves it |
|---|---|
| Owned and occupied 12 months | Deed, prior mortgage statements, ID and mail |
| Payment history | Mortgage statements, credit report |
| Credit profile | Credit report, explanations for any events |
| Income | Pay stubs, W-2s, tax returns as the lender requires |
| Debts | Credit report, loan statements |
| Property value | Appraisal ordered through the FHA case number |
| Equity left after closing | New loan stays within 80% of value |
If you are self-employed or have irregular pay, expect a longer income paper trail. The mechanics are identical.
Where Does the ADU Show Up in Underwriting?
It shows up in three places: income, appraisal and use of proceeds. In each, the ADU you have not built yet carries little weight.
Income
A standard FHA cash-out cannot count the unit’s rent as income. HUD’s mortgagee letter on ADU rental income allows rent to be counted for some FHA transactions. For a one-unit home with an ADU, though, it states that the rent cannot be used as effective income to qualify for a cash-out refinance.
So your household has to carry the new, larger payment on income you earn today. That includes the construction months, when the unit earns nothing, and any later vacancy.
Plan the ratios as if the ADU will never rent.
Appraisal
The appraisal values the property as it stands. Nothing in HUD’s documents supports using the finished unit’s projected value to raise the cap. If the home already has an ADU, the appraiser decides whether it is a single-family home with an ADU or a two-family dwelling. The ADU’s living area is kept out of the main house’s gross living area.
HUD’s glossary defines an ADU as a habitable unit with separate entry and exit that is subordinate in size to the primary one-unit home, and the two together form one interest in real estate. A single ADU on a one-unit property generally stays a one-unit property. Additional units get counted as units, and that can change eligibility.
Use of proceeds
Cash-out proceeds are not restricted to a purpose. You receive the money at closing. The lender does not hold it back or release it as work finishes. That freedom is convenient, and it is also where projects go wrong, because nothing enforces the budget.
How Much Cash Can You Actually Get? A Percentage Example
The 80% cap is the number that surprises people. It covers the entire new loan, not just the cash. Here is a simple picture using percentages of the appraised value.
- Say the appraisal comes in at 100% of value.
- Your current mortgage balance is 55% of that value.
- The maximum new loan is 80%.
- That leaves room of up to 25% of the value, before anything else is subtracted.
Then costs come out of that room. Closing costs and any financed costs sit inside the 80%. The FHA upfront mortgage insurance premium is 1.75% of the base loan and is typically financed, so it uses room too. The CFPB’s research on cash-out refinances lists origination, appraisal and title fees among the costs borrowers face. Each one trims the cash you walk away with.
Two more pieces apply. If you carry a second lien, it counts toward the same limit through the combined LTV rule. And HUD tightened the cash-out cap on adjusted value, a change HUD announced as a cut from the earlier ceiling. Older articles quoting a higher limit are out of date.
The annual mortgage insurance premium varies with term, loan amount and LTV. On a thirty-year loan at the higher LTV tier, it lasts for the term. At the lower LTV tier, it ends after eleven years. Because an FHA cash-out is capped well below the higher tier, a cash-out loan falls in the lower tier, though your lender confirms how the premium applies to your file. These specifics are subject to lender guidelines and a full review of property, leverage and credit.
When Does the General Rule Break?
The rule is “current income, current value, lump-sum cash.” These are the cases where the answer shifts.
The home already has an ADU
An existing unit changes the appraisal package. The lender may ask for a rent schedule, and reserves can come into play when the rent is used to qualify. On a cash-out, that rent still cannot be counted. It can help on a purchase or a rate-and-term refinance, where rules allow it, subject to caps and reserves.
The ADU is detached
A detached backyard cottage is a poor fit for the FHA renovation route, so a standard cash-out is usually the FHA path for a detached unit. Every income limit described above applies, and your lender confirms whether any renovation option can cover your project.
The ADU is attached and you want construction oversight
This is where the FHA 203(k) enters. HUD’s 203(k) program page explains that on a refinance the loan pays off your existing mortgage and the remaining funds sit in escrow, released as work is completed.
Two details matter. The Standard version requires an FHA-approved consultant, and permits are required. Projected rent from a new attached ADU may also be counted in part toward qualifying on a Standard 203(k), subject to a cap tied to your total income, so confirm the details with your lender. HUD has also updated the 203(k) rules since, including the rehabilitation period, so check the current requirements before you plan around them.
The ADU is not legal
The unit must be legally permissible under local zoning. That can include a legal nonconforming use. A permit-free garage conversion is a problem on any FHA path.
More than one unit
Two or more additional units are counted as additional units. That pushes the property toward a multi-unit classification and raises eligibility questions. Talk to a loan officer before you plan a second unit.
You do not live there yet
Standard FHA cash-out is for a principal residence only. If you inherited a house and have been renting it out, you would need to occupy it for 12 months before cash-out is allowed. If the home is a rental or second home, occupancy decides the leverage, and the FHA cash-out is generally not the tool.
The rate-and-term cousin
An FHA rate-and-term refinance with an appraisal reaches 97.75% on a principal residence you have occupied for the previous twelve months. It does not hand you cash for construction. It only helps if you want to change your loan and not fund a build.
How Does Each Financing Path Compare?
| Path | How funds arrive | ADU rent counts? | Best for |
|---|---|---|---|
| FHA cash-out | Lump sum at closing | No | Detached ADU, owner who manages the build |
| FHA 203(k) Standard | Escrow, released as work finishes | Partly, new attached ADU | Attached ADU, borrower who wants oversight |
| Home equity line | Draw as needed | Varies | Smaller projects, keeping the first mortgage |
| Construction loan | Staged draws | Varies | Larger projects, builder-led work |
A cash-out replaces your whole first mortgage. A line of credit or home equity loan adds a second payment instead. The CFPB’s HELOC brochure notes that a cash-out generally costs more at closing, because you are refinancing the whole loan.
This one is a genuine toss-up for many homeowners. If your current first mortgage is one you like, resetting it to fund a project is a real price. If your balance is high relative to value, the 80% cap may leave too little room. The best program for your situation depends on how much equity you have, whether the unit is attached, and how you feel about managing a build with no lender oversight.
What Happens If the ADU Costs More Than the Cash?
If the build runs over, the gap is yours to cover. Because the money is not tied to the project, nothing in the loan checks that you can finish, and a half-built unit does nothing for your payment or your equity.
The safer approach is to size the loan to the cash you actually need and keep a cushion outside the loan. If your budget is tight, a renovation product that controls the draws may suit you better than a lump sum.
What Are the Common Stumbling Blocks?
- Counting rent that does not count. Build your budget on current income only.
- Reading 80% as 80% cash. The cap covers the payoff and costs too.
- Starting the clock at the wrong point. The 12 months run back from the case number, not from closing.
- Assuming the future value helps. The appraisal values what exists today.
- Choosing cash-out for an attached unit without comparing 203(k). The escrow structure can be worth the extra paperwork.
- Skipping permits. Zoning legality is part of FHA’s view of an ADU, and it protects your resale too.
- Ignoring reserves after closing. Construction burns cash, and thin savings make a borderline ratio look worse.
If a file is borderline, lenders may look at documented compensating factors, a manual review, or a different structure altogether. A broker who shops several wholesale lenders can match the file to the program that reads it best.
Where Does the Borrower’s Decision Come Down?
Start with three questions. Is the unit attached or detached? How much equity remains after the payoff and costs, inside the 80% cap? And can your household carry the new payment with zero rent from the unit?
If the unit is detached, cash-out is the FHA path, and you plan around current income. If it is attached and you want escrowed funds, price out the 203(k) next to it. If the numbers do not leave room, a smaller project, a second-lien option or waiting to build more equity may be wiser than stretching.
Tax treatment can depend on your situation; borrowers should speak with a qualified tax professional before relying on any deduction or credit.
Frequently Asked Questions
Can I use FHA cash-out money to build an ADU?
Yes. Cash-out proceeds are not restricted to a purpose, so you can spend them on construction. The catch is that the lender does not track the project, and the unit’s rent and projected value do not help you qualify or raise your limit.
Will the future rent from the ADU help me qualify?
Not on a standard cash-out. HUD’s guidance says ADU rental income cannot be used as effective income for a cash-out refinance on a one-unit property. It can help in a Standard 203(k) on a new attached ADU, within limits.
Does the finished ADU raise how much I can borrow?
Not based on HUD’s published documents. The cap applies to the appraised value of the home as it stands, and the ADU’s living area is kept out of the main dwelling’s gross living area. If you refinance after the build, the finished unit would then be part of the appraisal.
What is the minimum credit score?
HUD’s own rules reach lower with a larger minimum investment, but the wholesale programs we place files with start at 580. Some lenders set higher floors, and every file is subject to full review.
Is 203(k) better than cash-out for an ADU?
It depends. A 203(k) pays off your mortgage and escrows the construction money, with a consultant and permits required, but it only fits an attached unit. A cash-out is simpler and works for a detached unit, but it gives you a lump sum with no oversight and no credit for projected rent.
Next Steps
Gather your recent mortgage statements, income documents and a rough construction budget. Confirm your ADU is legal under local zoning. Then decide whether the unit is attached or detached, because that choice shapes which FHA path is open to you.
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. You can request a scenario review to start.
For current guidelines and terms, see Lendmire’s FHA loan programs page.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage brokerage serving homeowners and home buyers in 16 states. FHA, VA, conventional and jumbo purchase and refinance loans are arranged through wholesale lending channels; Lendmire brokers the financing and the lender underwrites each application. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. HUD mortgagee letter on ADU rental income
2. HUD Handbook glossary (Update 14/15)
3. CFPB’s research on cash-out refinances
4. HUD mortgagee letter on cash-out refinance limits
5. HUD press release on the cash-out cap
This article is part of Lendmire’s FHA cash-out refinance program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: FHA Cash-Out Refinance Lenders for Renovations With a Higher Debt-to-Income Ratio · Banks That Offer an FHA Cash-Out Refinance to Maximize Your Cash Out · Does an FHA Cash-Out Refinance Make Sense to Build an Emergency Fund?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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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.