FHA Cash-Out Refinance Requirements to Build an Addition or ADU

The Quick Read: An FHA cash-out refinance can pay for an addition or ADU, but only if the home is your principal residence and you have owned and lived in it for 12 months before the case number. The loan tops out at 80% of the home’s current appraised value, and the money arrives as a lump sum with no construction draws. Because the appraisal values the home as it stands today, the equity you have now sets your building budget.

What Does an FHA Cash-Out Refinance Actually Do?

It replaces your existing first mortgage with a new, larger FHA loan and hands you the difference in cash, after payoff and closing costs. The new payment covers the whole new balance, not just the cash you took out.

Across the wholesale programs Lendmire places FHA files with, the cash-out reaches 80% LTV on a home you have owned and occupied for 12 months before the case number. You can read the program basics on Lendmire’s FHA cash-out refinance program page. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.

The key point for a builder: a plain cash-out has no required purpose. HUD’s Handbook 4000.1 transmittal records the cash-out limit of 80% of value, and nothing in the program rules Lendmire works with ties the proceeds to a construction schedule. The money is yours. So is the budget risk.

Key Terms Defined

• Cash-out refinance: A new mortgage larger than your current payoff, with the difference paid to you in cash.
• LTV (loan-to-value): The new loan balance divided by the home’s appraised value.
• Case number: The FHA file number assigned when the lender orders your appraisal; seasoning is measured back from it.
• Upfront premium: The one-time FHA mortgage insurance charge, 1.75% of the base loan, which is normally financed.
• 203(k): A separate FHA renovation loan that escrows repair money and sizes the loan on the home’s after-improved value.
• ADU: An accessory dwelling unit, a second small living space on the property such as a detached cottage or converted garage.

What Are the Core Requirements?

For a standard cash-out, the requirements come down to six items. Every figure below is subject to lender guidelines and full file review, and none is a commitment to lend.

County loan limits apply too. FHA limits are set by county and change every year, so the new loan has to fit under the limit for where the home sits.

Mortgage insurance applies as well. Expect the 1.75% upfront premium, usually financed, plus an annual premium between 0.15% and 0.75% of the balance depending on term, loan amount and LTV. On a thirty-year loan above 90% LTV, the annual premium lasts for the term. At or below 90%, it ends after eleven years.

As a rule of thumb on credit, some lenders set a higher floor than the 580 these wholesale programs use. That is a lender overlay, not an FHA rule.

How Is the File Underwritten, Step by Step?

1. Eligibility check. The lender confirms principal residence status, 12 months of ownership and occupancy, and recent payment history.

2. Appraisal. The appraiser values the home as it is today. Existing liens are paid off first, and the 80% cap applies to the total of all liens.

3. Sizing. Take 80% of that value, subtract your payoff and financed closing costs, and what remains is your cash.

4. Income and ratios. The underwriter adds the new, larger payment, including mortgage insurance, to your debt-to-income calculation. The automated finding governs most files.

5. Disclosures. You get a Loan Estimate. Compare it line by line. “Cash to close” is different from closing costs, and a zero in one does not mean a zero in the other.

6. Closing and funding. The old loan is paid off and you receive the net proceeds in one payment.

A home owned free and clear still counts as a cash-out refinance, so the 80% cap applies there too.

Does the Appraisal Count the Addition or ADU?

Not for a standard cash-out. The appraisal reflects the home as it exists on the day of inspection. A planned addition, even with permits and plans in hand, is not counted as finished value.

That is the biggest practical limit on this approach. The equity you have today decides the budget, and the new space adds value only after it is built. Run the numbers against today’s value, never the future one.

Can ADU Rental Income Help You Qualify?

No. HUD’s Mortgagee Letter 2023-17 states that for a one-unit property with an ADU, rental income from the ADU cannot be used as effective income to qualify for a cash-out refinance. You qualify on your own income.

The same letter updated HUD’s ADU definition and added ADU construction as an eligible improvement under the Standard 203(k). That tells you where HUD expects building financing to live.

When Should You Look at a 203(k) Instead?

Consider the 203(k) when the project is larger than your equity can fund, or when you want controlled funds. HUD’s 203(k) program answers explain that a Standard 203(k) requires at least $5,000 in repairs and an FHA-approved consultant, and that the total mortgage, including repair costs, must stay within the area FHA limit. HUD’s processing workflow describes the consultant’s role: inspecting the property, preparing the work write-up and cost estimate, and supplying architectural exhibits.

Here is how the two compare for a build.

An addition or ADU is structural work, so the Standard 203(k) is the relevant version. HUD’s current figure for the Limited 203(k), which is for minor non-structural work, is $75,000 in total rehabilitation cost, so it is not the path for a build. Older HUD material shows a lower cap, which is out of date.

Pick the cash-out when your equity covers the project, your budget has real cushion, and you trust yourself and your contractor to manage the money. Pick the 203(k) when the project needs more than 80% of today’s value can release, or when you want a consultant and a draw process watching the work. If the cash-out and the 203(k) both look possible, the 203(k) costs more in paperwork and consultant fees, while the cash-out costs more in risk.

Where Does the General Rule Break?

Four edge cases come up often.

• Recent buyers. If you bought within the last 12 months, you cannot use the cash-out. A 203(k) is the usual route for people renovating at or soon after purchase.
• Inherited homes. A borrower who rents an inherited property generally must live in it before a cash-out is allowed. Check the current handbook text with your loan officer.
• A late payment. One recent late mortgage payment can end a cash-out file, even when equity is strong.
• Local zoning. The ADU has to comply with local zoning and permitting no matter which loan pays for it. FHA does not fix that for you.

What Does Your Decision Look Like in Practice?

Picture a homeowner with a house they have lived in for several years, a modest balance, and an addition priced at a sizable share of the home’s value. The sequence runs like this.

First, get contractor bids and a realistic budget with a contingency, because the cash-out gives you a single lump sum and nothing more. Second, ask the lender for a rough estimate of 80% of the home’s current value less your payoff and closing costs. If that number clears the bid with room to spare, cash-out is workable. If it lands close to the bid, an overrun puts you out of pocket.

Third, plan how you will pay the contractor. With no draw schedule, you set the schedule: a deposit, milestone payments, and a final payment held until the work passes inspection. Keep the unspent cash in an account you control.

Fourth, think about the whole loan, not just the cash. The new loan replaces your old one, so a larger balance and mortgage insurance carry into every future payment. Whether that tradeoff is better than a separate home equity loan depends on the terms you keep and the terms you take on, which is why borrowers compare options side by side.

Why Do These Files Stall?

• The home was bought less than 12 months ago.
• Recent late payments on the current mortgage.
• Equity is thinner than expected once the 80% cap and liens are applied.
• The new payment pushes ratios past what the file can carry.
• The project budget depends on rental income from the ADU, which cannot count.
• The new balance would exceed the county loan limit.

Next Step

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.

For your own numbers, request a scenario review with Lendmire.

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.

References

1. HUD Handbook 4000.1 transmittal

2. HUD Mortgagee Letter 2023-17

3. HUD FHA Answers: 203(k) program

4. HUD 203(k) processing workflow