The Quick Read: There is no single best program, because no loan type is built just for an ADU. The right fit depends on your equity, your current loan, and whether you need cash in hand or project funds released as work is finished. A standard cash-out refinance, a renovation refinance, and a VA cash-out are the main lanes. The FHA Streamline and VA IRRRL generally cannot fund new construction.
Key Takeaways
- Fannie Mae says no specific financing type is required for a home with an ADU. It treats the unit like any other improvement.
- A standard cash-out loan is sized on your home’s current appraised value. A planned ADU does not raise that limit.
- Renovation loans size the loan on the “as completed” value, which can keep more equity usable.
- Detached versus attached, legal zoning, and your existing loan type often decide the answer faster than the loan label does.
Is There a Special ADU Loan?
No. A granny flat, in-law suite, backyard cottage, and ADU are the same idea: a second living space on the same parcel as your main home. Fannie Mae defines an ADU as a unit with living, sleeping, cooking, and bathroom facilities, on the same parcel as the primary one-unit dwelling. A second kitchen alone does not count.
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: 7.24% as of October 29, 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.
So the real question is which existing program fits. Across the wholesale programs we place consumer files with, the choice usually comes down to one test: do you need cash you control, or funds spent on the project? Lendmire’s cash-out refinance programs page covers the conventional lane in more detail. Lendmire is a mortgage broker, so the work is matching your scenario to the program that reads it best.
How Does a Standard Cash-Out Refinance Fund an ADU?
A standard cash-out refinance replaces your mortgage with a larger one and hands you the difference at closing. You can spend it on anything, including construction. Conventional cash-out generally reaches 80% LTV on a one-unit principal residence. Two- to four-unit properties, second homes, and investment property top out at 75%. These figures are subject to lender guidelines and full file review.
The loan is measured against today’s value, counting all liens. That is the catch for ADU builders. A lender will not credit the unit you have not built. If your equity after the new loan clears the cap, this lane works well. If it does not, the project cost may outrun what the cash-out can deliver.
Seasoning rules apply too. Under Fannie Mae’s SEL-2023-01 update, the first mortgage being paid off must be at least 12 months old, measured note date to note date. At least one borrower must have been on title for 6 months, with exceptions such as delayed financing, inheritance, and legal awards.
Texas homeowners face a different cap. A cash-out on a homestead (a Section 50(a)(6) loan) is limited to 80% of the home’s value by the state constitution.
The no-mortgage-insurance wrinkle
Conventional loans above 80% LTV carry mortgage insurance, with one exception: a wholesale cash-out lane reaches 89.99% LTV with no mortgage insurance. It requires a 680 score, a 50% ratio, a thirty-year fixed rate, a primary residence, a conforming balance, and its own six months of seasoning. For a borrower with strong credit and moderate equity, that lane can stretch usable equity further than the standard cap. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.
What About Renovation Refinances?
A renovation refinance rolls the build cost into the loan and sizes it on the home’s value once the work is done. That helps when current equity is thin. Three products matter here:
- Fannie Mae HomeStyle Renovation. Fannie Mae’s accessory dwelling unit page says borrowers can use HomeStyle Renovation to refinance a one-unit property and build or install a new ADU. Its FAQ allows detached units, provided all work meets local and state codes. There is no minimum project size.
- Freddie Mac CHOICERenovation. Freddie Mac treats proceeds used only for eligible renovations as a no cash-out refinance. Its ADU fact sheet says any Freddie Mac product is eligible if it meets that product’s rules, with zoning that is legal, legal non-conforming, or absent.
- FHA 203(k). HUD’s program lets homeowners refinance and roll renovation costs into one loan. Permits are required, and a Standard 203(k) needs an FHA-approved consultant. HUD’s program comparison says an ADU must be attached to the existing structure.
Here is the tradeoff. Renovation funds typically sit in a custodial account and are paid out in draws as work is completed. You do not get a lump sum. That protects the lender, and it adds paperwork: a contractor contract, plans, and permits. If you want cash you can deploy on your own schedule, a standard cash-out fits better. If the project is the whole point and equity is tight, a renovation loan may reach further.
Which Lane Fits Your Situation?
| Your situation | Lane that often fits | Watch-out |
|---|---|---|
| Plenty of equity, want flexible cash | Standard cash-out | Current value only; ADU adds nothing to the cap |
| Thin equity, big project | Renovation refinance | Draws, permits, contractor review |
| Existing FHA loan, attached ADU | FHA 203(k) | Must be attached |
| Existing VA loan | VA cash-out refinance | IRRRL cannot take cash out |
| Built ADU with short-term financing | CHOICERenovation no cash-out option | Unit must be complete before the note date |
| Detached ADU, conventional loan | HomeStyle or standard cash-out | Local code compliance |
This is a genuine judgment call in many files. A borrower with a low existing rate may be better off keeping it and adding a separate equity loan, since a cash-out refinance resets the rate and term on your entire balance, not only the new money. A borrower with a higher existing rate may find the refinance replaces a costly loan and funds the build in one step. The Consumer Financial Protection Bureau notes that a cash-out may lengthen the payoff time and raise the monthly payment, and that the debt is secured by your home.
Where Do FHA Streamlines and VA IRRRLs Fall Short?
They fall short for construction. The FHA Streamline uses limited documentation and no new appraisal, and no cash comes out. Without an appraisal, it cannot fund new construction. The VA IRRRL is a VA-to-VA loan, and the borrower may not receive cash from the proceeds except for energy-efficiency improvements.
A veteran building an ADU needs the VA cash-out refinance, which the VA lists as a separate loan type that can fund home improvements. An FHA borrower can look at 203(k) for an attached unit, or a conventional renovation or cash-out loan if equity and credit allow.
What Underwriting Looks Like, Step by Step
1. Pick the lane. Decide whether you need cash at closing or project-controlled funds.
2. Check seasoning and title. The 12-month and 6-month rules apply to conventional cash-out.
3. Gather documents. Expect income, credit, assets, and the payoff of your current mortgage. Renovation loans add the contractor contract, plans, and permits.
4. Appraisal. A standard cash-out uses the as-is value. Renovation products use the as-completed value.
5. Property classification. Lenders decide whether you have a one-unit home with an ADU or a multi-unit property. Separate utility meters, a unique postal address, and legal rentability all play a part.
6. Closing. You receive a Loan Estimate and Closing Disclosure like any consumer mortgage. Net cash is lower than gross cash-out, since closing costs come out of pocket or are added to the loan.
Most files start with credit and ratios. The wholesale conventional programs we place 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% with reserve and score factors. All of it is subject to lender guidelines.
Can ADU Rental Income Help You Qualify?
Sometimes. FHA’s ADU policy lets lenders count rental income from a legally rentable ADU in qualifying income, based on market rent, as HUD announced. Freddie Mac’s fact sheet allows documented ADU income on a purchase or no cash-out refinance of a one-unit primary residence, with caps on how much counts. Rules differ by program and loan purpose, so ask early whether projected income can be used on your file.
Where the General Rule Breaks
A few named edge cases can change the answer:
- Unit counts. Fannie Mae has recently expanded how many ADUs it allows. Confirm the current Selling Guide rather than relying on older summaries.
- Detached versus attached. HomeStyle allows detached units. FHA 203(k) does not.
- Manufactured-home ADUs. Possible, but under Fannie Mae the unit must be converted to real property and meet manufactured-home rules.
- Unpermitted or non-conforming zoning. Freddie Mac allows legal non-conforming use, with a narrow exception for certain illegal zoning on one-unit properties. An unpermitted unit is a real obstacle.
- PACE assessments. Unpaid PACE obligations can block cash-out eligibility.
- Home listed for sale. It generally must come off the market by disbursement.
- LLC title. Limited cash-out does not accept an LLC as owner.
Cash-Out Versus Rate-and-Term: A Quick Clarification
A rate-and-term (limited cash-out) refinance pays off your first mortgage, closing costs, and a purchase-money second lien, with only incidental cash back. The agencies set that cap differently: Fannie Mae allows the lesser of 2% of the new loan or $2,000, and Freddie Mac allows the greater of 1% of the new loan or $2,000. The definition lives in Fannie Mae’s limited cash-out guide. It reaches up to 95% LTV on a one-unit principal residence, but it will not fund a build. If you want to lower your payment and also have a project, those are two different goals, and the program choice follows from which one comes first. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.
Key Terms Defined
ADU (accessory dwelling unit): A second living space with its own sleeping, cooking, and bathroom facilities, on the same parcel as your main home.
LTV (loan-to-value): Your total loan balance divided by the appraised value of the home.
As-completed value: The appraised value of the home as if the planned work were finished.
Seasoning: The minimum time a mortgage or ownership must exist before you can refinance with cash out.
Draw: A scheduled release of renovation funds as each stage of work is finished.
Mortgage insurance: Coverage the borrower pays on conventional loans above 80% LTV, cancelable at 80% and automatically ended at 78% under the Homeowners Protection Act. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.
Frequently Asked Questions
Can I use a cash-out refinance to build a granny flat?
Yes, proceeds from a standard cash-out can be spent on any purpose, including an ADU. The limit is set by your home’s current value, so enough equity must exist before construction. Your lender will also review local zoning and permits on the planned unit.
Does the planned ADU increase how much I can borrow?
Not on a standard cash-out. That loan uses the current as-is appraisal. Renovation products such as HomeStyle and 203(k) use the value after improvements, which can raise usable equity but come with draws and documentation.
Should I use a home equity line instead?
It depends on your current loan. If your existing first mortgage carries terms you want to keep, a separate equity loan leaves it untouched, though it adds a second payment. If the refinance would improve your first mortgage anyway, a cash-out consolidates everything into one loan.
Can I take cash out if I bought or refinanced my home recently?
Conventional cash-out generally needs a first mortgage at least 12 months old and 6 months on title, with exceptions such as delayed financing, inheritance, and legal awards.
Is the interest tax deductible?
Tax treatment can depend on your situation; borrowers should speak with a qualified tax professional before relying on any deduction or credit.
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. Reach the team at 828-256-2183. Program figures are subject to lender guidelines and full file review, and nothing here is a commitment to lend.
For your own numbers, request a scenario review with Lendmire.
For current guidelines and terms, see Lendmire’s refinance programs page.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage broker that arranges FHA, VA, conventional and jumbo home purchase and refinance financing in 16 states through wholesale lenders. Every option is subject to the lender’s guidelines and full underwriting. 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
2. Fannie Mae Selling Guide B2-3-04
4. Fannie Mae HomeStyle Renovation FAQ
6. HUD 203(k) Program Comparison
7. CFPB Using Home Equity Guide
9. Fannie Mae Selling Guide B2-1.3-02 Limited Cash-Out
This article is part of Lendmire’s cash-out refinance program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Can You Do a Cash-Out Refinance After a Parent Adds You to the Deed? · Can You Get Approved for a Cash-Out Refinance on a Primary Residence? · Cash-Out Refinance Requirements and LTV Limits
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Important disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage brokerage. Lendmire is not a direct lender, depository institution, or financial advisor. All loan inquiries are subject to lender underwriting; this article does not constitute a commitment to lend. Rates, terms, and program guidelines are subject to change without notice and vary by borrower profile, property type, and state. Information in this article is general in nature and is not financial, legal, or tax advice. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.