The Quick Read: A cash-out refinance replaces your current mortgage with a larger one and pays you the difference as a single lump sum. You can spend that money on a backyard cottage, a garage conversion or another accessory dwelling unit (ADU). The loan is sized on what your home is worth today, not on what it will be worth once the unit is finished. So the plan comes down to three things: your equity, the loan you would be giving up, and a build budget with room for surprises. Every program figure below is subject to lender guidelines and full file review, and nothing here is a commitment to lend.
Key Takeaways
- A standard cash-out refinance is appraised on the home as it stands now. The future ADU adds nothing to the value used for the loan.
- Conventional cash-out on a one-unit primary residence reaches 80% of value. Two- to four-unit principal residences, second homes and investment properties reach 75%.
- Your existing first mortgage generally needs to be at least 12 months old, and you generally need 6 months on title.
- You refinance the whole balance, not just the ADU money, so the loan you are replacing matters as much as the cash you receive.
- Whether future ADU rent can help you qualify depends on the program. For an FHA cash-out, it cannot.
What Does a Cash-Out Refinance Actually Do?
It pays off your existing first mortgage with a new, larger loan and sends you the leftover amount at closing. You then control the money. There is no draw schedule and no inspector releasing funds in stages. You pay the contractor, the permit office and the utility crews on your own schedule.
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: 7.18% as of November 5, 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.
That freedom is the main appeal. It is also the main risk, because the discipline of staging payments falls to you.
An ADU, in plain terms, is a separate living space on the same lot as your house. It has its own sleeping, cooking and bathroom facilities, and a person can reach it without walking through your home. It can be a detached cottage, a converted garage or a basement or attic unit. Zoning decides which of those you can build where you live.
You can see the structures and the equity each one reaches on Lendmire’s cash-out refinance programs page.
How Much Equity Do You Need?
Enough that the new loan, at the program’s leverage cap, still leaves cash after paying off your current mortgage and closing costs. The cap is the first number to learn. Conventional cash-out is written to 80% of value on a one-unit principal residence. It is 75% on a two- to four-unit principal residence, a second home or an investment property. Occupancy sets the leverage, so the same house can reach a different amount depending on how you use it.
Run the math in percentages of value, since your dollar figures are your own:
| Step | Example (as % of home value) |
|---|---|
| Maximum new loan at 80% LTV | 80% |
| Less: current mortgage balance | 55% |
| Less: closing costs (varies by loan) | A few points |
| Cash available for the build | roughly 25% minus costs |
The 55% balance is a modeled assumption, not a market fact. Swap in your own number. If your balance is 70% of value, the room shrinks to about 10% before costs. That may not cover an ADU at all.
Two notes. First, a wholesale conventional lane reaches 89.99% LTV with no mortgage insurance at a 680 score and a 50% ratio on a thirty-year fixed, primary residence, conforming balance. It carries its own six months of seasoning, and it is the one exception to the usual rule that mortgage insurance applies above 80%. Your file would be reviewed to see whether you fit it. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
Second, in Texas a cash-out on a homestead is capped at 80% of the home’s value by the state constitution (a Section 50(a)(6) loan). The 89.99% lane is not written there.
Keep a cushion anyway. A federal consumer-protection guide from the CFPB notes that lenders typically expect you to keep a 10% to 20% equity cushion after borrowing. It is a sound habit even where the program would let you go thinner.
The Plan, Step by Step: Seven Stages
Here are the seven stages, from first check to the build itself.
1. Check the seasoning clocks. Conventional cash-out has two. The loan being paid off must be at least 12 months old, counted note date to note date. Fannie Mae’s cash-out seasoning notice sets that 12-month age. Freddie Mac’s Guide section 4301.5 adds that at least one borrower must have been on title for six months, with listed exceptions. The same section places no restriction on how you use the proceeds, which is why an ADU is a permitted use.
2. Confirm the ADU qualifies. Same parcel, independent access, legal under local zoning. Fannie Mae’s ADU guidance lays out how the unit is treated in underwriting. The rules on how many ADUs a lot can carry, and on ADUs with two- to four-unit homes, have changed in recent years. Check the current Selling Guide ADU rules with your loan officer before assuming a count.
3. Pick the structure. Cash-out then build, or a renovation-style refinance. The next section compares them.
4. Order the appraisal. The appraiser values the home as it exists. For an ADU that is already standing, the appraiser also reports the unit’s market rent.
5. Go through underwriting. The lender reviews income, assets, credit, debt-to-income ratio and reserves. The wholesale conventional programs start at a 620 decision score. The automated finding governs most files, with a total ratio ceiling of 50%. Manually underwritten loans use 36% or 45% ratio limits, with reserve and score factors from the Eligibility Matrix. Reserves can be required on cash-out files with higher ratios.
6. Close and receive the funds. A cash-out refinance releases the money in one payment at closing. A renovation-style loan holds the money back and releases it in stages as work is completed.
7. Build with a plan. Permits, contractor schedule, utility hookups and a contingency fund. Before closing, decide how you will hold the lump sum so it does not drift into other spending.
Cash-Out, Renovation Loan, or Something Else?
For most homeowners who want a lump sum and a simple loan, a standard cash-out refinance is the straightforward path. A renovation-style refinance can make more sense when the equity is thin today but the finished unit would raise the value. The table compares the main options.
| Option | Best fit | Main tradeoff |
|---|---|---|
| Cash-out refinance | Solid equity today, want flexibility | Resets the whole loan; ADU value not counted |
| Renovation-style refinance | Equity depends on finished value | More paperwork; funds released in stages |
| Home equity loan or HELOC | Low existing mortgage worth keeping | Second lien; terms differ by lender |
| Limited cash-out (rate-and-term) | Lowering cost of the current loan | Only incidental cash back; cannot fund a build |
A renovation-style loan, such as Fannie Mae’s HomeStyle Renovation, can be appraised on the value as completed, and the home does not need to be habitable at closing. It is a separate product, so ask whether a given lender offers it. FHA has its own renovation program with separate rules on how an ADU must attach to the home.
The limited cash-out row deserves a warning. The new loan pays off the existing first mortgage, the closing costs and a purchase-money second lien, with only incidental cash back. Under Fannie Mae’s rules, that cash is the lesser of 2% of the new loan amount or $2,000. Under Freddie Mac’s rules, it is the greater of 1% of the new loan amount or $2,000. Either way, the amount is too small to fund a construction project.
Where the General Rule Breaks
The plan above fits a typical one-unit primary residence. These situations change it.
Your existing mortgage is a low-cost one. A cash-out replaces the entire balance, so the terms on all of it reset. The CFPB guide warns that the payoff period may lengthen and the monthly payment may rise, and that the new loan changes your interest rate and other terms. If your current loan is one you want to keep, a second-lien option may fit better.
You have a government loan. The FHA Streamline and the VA IRRRL are for existing FHA and VA loans, and neither pays out cash. They cannot fund an ADU. A veteran who wants build money looks at a VA cash-out refinance instead. FHA cash-out is a separate product, and HUD caps it at 80% LTV and CLTV under Handbook 4000.1 updates. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.
You bought recently. The seasoning clocks apply. Delayed financing is the named exception for people who bought with cash. The purchase closing statement must show that no financing secured by the property was used, and cash-out pricing still applies.
You inherited the home, were awarded it in a divorce, or hold it in a revocable trust. These situations can waive the time-on-title rule. Ask your loan officer how the file would be documented.
The ADU is a manufactured home. HomeStyle Renovation can be used for a manufactured-home ADU if the standard manufactured-home rules are met, including conversion to real property.
You have a HELOC or other second lien. Paying it off in the new loan changes the classification of the refinance. A low-cost second mortgage is also lost when it is paid off, so weigh that.
You are using a construction-to-permanent loan. Those are processed as purchase, limited cash-out or cash-out transactions depending on the structure. That is a different conversation from this one.
Can Future ADU Rent Help You Qualify?
It depends on the program, and on the loan type. Fannie Mae’s ADU income flyer says the appraiser reports the unit’s market rent and that accessory-unit income may be underwritten in the automated system or manually. Its own example shows a debt-to-income ratio that moves from ineligible to eligible once rent is counted. That is an illustration, not a rule for every file.
For an FHA cash-out, the answer is no. HUD’s Mortgagee Letter 2023-17 states that rental income from an ADU cannot be used as effective income to qualify for a cash-out refinance on a one-unit home with an ADU.
How Fannie Mae treats ADU rent on a full cash-out, as distinct from other transaction types, is worth asking about directly. The answer can change the whole plan. Do not count on rent you have not yet earned.
What Decides the Outcome
Six things carry the file:
- Appraised value today, compared with the value once the unit exists
- The leverage cap, which sets the largest loan you can take
- Your credit score and ratio of debts to income
- Whether any rental income can count
- Whether the project is legal under local zoning and can be permitted
- Your budget, including a contingency for overruns
On that last point, a build budget needs more than the contractor’s quote. Add design and permit costs, utility connections and a cushion. Then size the cash-out to the full number, not the base bid. A shortfall mid-build is a harder problem than borrowing a little more at closing.
The new loan also changes your monthly budget. It may be larger, and the term and interest rate apply to the whole balance. Compare total cost, not just the monthly figure. Ask for a side-by-side of your current loan and the new one, on the Loan Estimate you receive.
When a Cash-Out Is the Wrong Tool
Skip it when the equity is thin. If the maximum loan barely exceeds your payoff, the cash will not cover a build and you would pay for a full refinance anyway.
Skip it when your current loan is one you want to keep. Resetting a loan with favorable terms to gain a modest sum is a poor trade.
Skip it when the plan depends on rent that program rules do not count. If you need the ADU income to qualify, confirm that first.
Reconsider the timing when the project is not yet permitted. Taking a lump sum before you know what the build will cost, or whether it can proceed, leaves you carrying a larger loan for a unit that may not exist.
What the Decision Looks Like in Practice
Picture a homeowner with a one-unit primary residence, a steady income and a mortgage balance around half of the home’s value. The first mortgage is well past 12 months old and she has owned the house for years. The cash-out room at 80% is large, the ratio is comfortable, and she wants flexibility on contractor timing. A standard cash-out fits.
Now picture a second homeowner whose mortgage balance sits near 75% of value, and whose current loan has terms he likes. The room is small. He would be refinancing the entire balance to free up a thin slice. A second-lien product or a renovation-style loan deserves a look first.
A third homeowner has a good equity position today but says she needs the future rent to meet the lender’s ratio. If her loan is FHA, that rent cannot count. If it is conventional, the answer depends on the transaction and the underwriting method. She needs those answers before she commits.
None of these is the right answer for everyone. The right loan depends on your balance, your existing terms, your program and how firm the build budget is.
Key Terms Defined
Accessory dwelling unit (ADU): A separate living space on the same lot as a primary home, with its own sleeping, cooking and bathroom facilities and independent access.
Cash-out refinance: A new, larger mortgage that pays off the current one and pays you the difference in cash at closing.
Limited cash-out refinance: A refinance that pays off the existing loan and closing costs and returns only a small, capped amount of cash.
Seasoning: The minimum time a loan has existed, or a borrower has been on title, before a cash-out refinance is allowed.
Loan-to-value ratio (LTV): The loan amount divided by the home’s appraised value, shown as a percentage.
As-completed appraisal: A valuation that estimates a home’s worth once planned construction is finished, used by renovation-style loans.
Frequently Asked Questions
Does the ADU add to my home’s value when the lender sizes the loan?
Not on a standard cash-out refinance. The appraisal reflects the home as it exists on the day of the appraisal, so an unbuilt unit contributes nothing. Only a renovation-style loan uses an as-completed value. That gap is why equity today, not the finished unit, drives how much you can borrow.
Can I use a VA IRRRL or FHA Streamline to pay for an ADU?
No. Both are streamlines for existing government loans and neither pays out cash. A veteran would look at a VA cash-out refinance. A homeowner with an FHA loan would look at an FHA cash-out, which is capped at 80% LTV and CLTV, or a conventional cash-out if the file fits. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.
Do I need to own the home for a certain period before cashing out?
Usually yes. At least one borrower generally needs six months on title, and the first mortgage being paid off generally needs to be at least 12 months old. Exceptions exist for delayed financing, inheritance, a legal award such as a divorce, and revocable-trust ownership. The wholesale no-mortgage-insurance lane adds its own six-month seasoning.
Is a cash-out refinance cheaper than limited cash-out?
Limited cash-out is the lower-cost structure for a plain refinance, but it returns only incidental cash and cannot fund a build. Cash-out pricing carries adjustments based on LTV and credit score, so expect it to be priced differently. Compare the full Loan Estimate for each structure, not one line of it.
Will a second unit change my property taxes or insurance?
Possibly, and both vary by county and insurer. Ask your insurance agent and your local assessor before you finalize the budget. Build the answer into your monthly numbers.
Weighing a Cash-Out Against Keeping Your Loan
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.
For current guidelines and terms, see Lendmire’s refinance programs page.
About Lendmire
Lendmire is a mortgage brokerage (NMLS# 2371349) licensed for consumer mortgage lending in 16 states, arranging FHA, VA, conventional and jumbo purchase and refinance loans through a wholesale lending network. Eligibility is determined by the lender on each file. 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. CFPB, Using Home Equity to Meet Financial Needs
2. Fannie Mae, Updates to Cash-Out Refinance Eligibility
3. Freddie Mac Guide Section 4301.5, Cash-Out Refinance Mortgages
4. Fannie Mae, ADU Rental Income and Appraisal Reporting
6. HUD Mortgagee Letter 2023-17
This article is part of Lendmire’s cash-out refinance program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Best Cash-Out Refinance Program on a One-Unit Primary Residence With Maximum LTV Limits · Cash-Out Refinance Requirements to Build an Emergency Fund · Is a Cash-Out Refinance Worth It for a Large Expense?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.