The Quick Read: A jumbo cash-out refinance can fund an addition or ADU, but the lender usually sizes the loan on what your home is worth today, not what it will be worth after the build. Across the wholesale programs Lendmire places files with, you need a decision score of 660 on the headline lane, leverage that tops out at 90% LTV, and reserves that grow with the loan amount. Cash-out leverage runs lower than purchase leverage, so the equity you hold today decides how much of the project the loan can cover. Everything here is subject to lender guidelines and full file review, and nothing is a commitment to lend.
What Makes a Cash-Out Refinance “Jumbo”?
A loan is jumbo when it starts one dollar above your county’s conforming limit. The Federal Housing Finance Agency sets that limit each year, and it is higher in designated high-cost counties. Look up the current number for your county before you assume which side of the line you are on.
Jumbo cash-out estimate
Enter the value, the balance, and the cash wanted; choose the occupancy and the structure; the lanes, the payment, and the reserves follow.
Editable benchmark: 7.24% as of October 29, 2026 · Freddie Mac 30-year average via FRED®. A conventional market reference, not a jumbo cash-out refinance quote.
Illustrative starting assumptions: a $2,000,000 home value in the jumbo range, a $1,000,000 current balance, a principal residence on a thirty-year fixed structure at the current Freddie Mac conforming 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 conforming benchmark, a market reference and not a jumbo cash-out refinance quote; a jumbo loan is priced by the lender at lock. The lanes shown are the wholesale cash-out lanes behind this page as of the snapshot date; the calculator reads each lane’s leverage, loan maximum by occupancy, cash-in-hand cap, and reserves as the lane table states them, and a Lendmire loan officer confirms the lane on the file. The cash available is the loan the lane allows less the balances paid off, before closing costs, which are not included; on most lanes a jumbo cash-out begins one dollar above the conforming limit for the county, and two lanes start at a stated dollar floor instead. The HELOC line is the line 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.
Why does the line matter? Fannie Mae and Freddie Mac cannot buy loans above it. Without that agency backing, each wholesale lender writes its own rules for credit, leverage, reserves and appraisals.
Is construction an allowed use of the money? On a standard cash-out refinance, yes. The lender cares about the home, your credit and your repayment-capacity. It does not usually control how you spend the cash. A true renovation loan works differently, and we get to that below.
A cash-out refinance also replaces your whole mortgage, not just the extra cash. The agency vocabulary draws the line this way: Fannie Mae’s Selling Guide on limited cash-out refinances defines when a refinance counts as “limited” versus cash-out. Take cash beyond paying off the old loan and the costs, and you are in cash-out territory with tighter leverage.
For the program details, see Lendmire’s jumbo cash-out refinance program page.
The Requirements at a Glance
The core requirements are credit, leverage, debt ratio, reserves, documented income, and an appraisal. The table shows each one and why it matters when the money is going into construction. Figures come from the wholesale jumbo lanes Lendmire works with, and they vary by lane.
| Requirement | What the lanes look like | Why it matters for a build |
|---|---|---|
| Credit | 660 decision score on the headline lane | Sets which lane you can use |
| Leverage | Up to 90% LTV; several lanes 89.99% CLTV; others stop at 80% | Caps how much cash you can pull |
| Debt ratio | Limits vary by lane and by whether the loan is fixed, adjustable, or interest-only | The new loan replaces your old payment |
| Loan size | Up to $5,000,000 on the largest lanes | Bigger loans trigger more scrutiny |
| Reserves | Months of full payment, rising with amount | Cash left after closing counts |
| Appraisal | Two appraisals above a lane’s threshold | Value drives everything else |
Two labels deserve care. LTV is loan-to-value: your loan divided by the home’s appraised value. CLTV is combined loan-to-value, which adds any second loan to the first. On the lanes that reach the top, 90% is the LTV ceiling and 89.99% is the CLTV. They are not the same number, so do not round one into the other.
Cash-out leverage runs lower than purchase leverage. On the largest lanes, a cash cap also limits how much money you can take out, whatever your equity says. Occupancy changes the picture too. Primary, second-home and investment properties each carry their own leverage, and this article assumes the home you live in.
How the Loan Is Underwritten, Step by Step
Underwriting follows a predictable order: project, permissions, structure, qualification, appraisal, closing. Knowing the order helps you avoid surprises, especially the appraisal one.
Step 1: Define the project. Lenders like a clear scope of work, a contractor bid or budget, and plans. A detached ADU or a large addition draws more questions than a modest bump-out.
Step 2: Check permissions. Zoning and local ADU rules decide whether the project is allowed at all. Lenders commonly want to see permits or a clear path to them. A project that cannot be permitted is a project that cannot be built, and the loan is not the problem.
Step 3: Choose the structure. Most jumbo lanes offer fixed, adjustable and interest-only options. The structure shapes your debt-ratio ceiling, as the table shows. Separately, you choose between a standard cash-out and a renovation-style product. More on that shortly.
Step 4: Qualify. The lender reviews your credit, your debt-to-income ratio (monthly debts divided by monthly income), your reserves, and your documented income and assets. Expect pay stubs, W-2s and tax returns if you are salaried, and the lender’s own documentation path if you are self-employed. You will also provide asset statements, homeowners insurance, and your plans, bids and permits.
Step 5: Appraise. This is the step that decides the outcome, so it gets its own section.
Step 6: Close and receive funds. On a standard cash-out, you get the proceeds at closing and pay your contractor yourself. Because this is a refinance of your primary home with a new lender or new money, you get a three-business-day window to change your mind. The CFPB explains how the right of rescission works and when the clock starts, and that the window can be waived only for a bona fide personal financial emergency. A construction start date is not an emergency.
The Appraisal Problem
On a standard jumbo cash-out, the appraiser values your home as it stands today. The addition does not exist yet, so it adds no value on paper. That single fact shapes the whole deal.
Here is what it means in practice. The lender applies its cash-out leverage cap to the current value. Your existing balance eats part of that room. Whatever remains, within the cash cap on larger lanes, is the most cash you can take. If your project budget is larger than that, you have a gap.
Picture a homeowner with a large amount of equity and a primary residence worth far more than the loan balance. Say the lane caps cash-out at a leverage figure well below the top purchase number. The room between the existing balance and that cap is the whole pool of cash. A budget that looks reasonable against the home’s future value can still overshoot it. Do this math before you hire an architect, not after.
Above a lane’s threshold amount, expect two appraisals. That adds cost and review to larger files.
ADUs add a second wrinkle. Appraisers lean on comparable sales, and sales of homes with ADUs can be thin in many areas. Even a lender that credits an as-completed value may land lower than your contractor’s optimism suggests.
Standard Cash-Out vs. a Renovation Loan
A standard cash-out gives you a lump sum and trusts you to spend it. A renovation or construction-to-permanent loan values the home as completed and releases money in stages. Which one fits depends on how much equity you hold today.
Agency renovation products show how the second type works. Fannie Mae’s HomeStyle Renovation program uses an as-completed appraisal, holds funds in a custodial account, and pays contractors through lender-managed draws with inspections. Eligible projects can include additions such as in-law suites. Those products exist for conforming-size loans, though. Some jumbo lenders offer their own renovation or construction-to-perm versions, and the terms are theirs to set.
| Option | How funds arrive | Value used | Best when |
|---|---|---|---|
| Standard jumbo cash-out | Lump sum at closing | Current, as-is | You have deep equity today |
| Jumbo renovation or construction-to-perm | Staged draws, inspected | Often as-completed | Equity is thin until the build is done |
| HELOC or home equity loan | Second loan, first stays | Current | You want to keep your existing first mortgage |
| Personal funds | Your own cash | None | You can cover the gap yourself |
That last comparison is worth pausing on. A cash-out refinance replaces your entire first mortgage. If your current loan is one you want to keep, a home equity loan or HELOC may fit better. This one is a genuine toss-up for many homeowners: the cash-out is a single loan with one payment, while the second loan leaves your first untouched. Run both on paper. The right answer depends on your balance, your equity and how much cash the project needs.
Where the General Rule Breaks
The general rule says the loan sizes off today’s value and the lump sum is yours to spend. These edge cases bend it.
ADU rental income. Agency rules allow limited use of ADU rental income in certain situations. Jumbo lenders often do not count projected income from a unit that has not been built. Treatment varies by lender, so do not assume the rent will help you qualify. Plan to qualify on your own income.
ADU type. Some lenders limit ADU financing in some configurations, such as a detached unit, a unit on a separate meter, or a unit on an unusual lot. Ask early.
Occupancy. A family-use ADU and a rented ADU can land differently in the file. If the home is a second home or an investment property, occupancy sets the leverage on that lane.
Seasoning. Some lenders impose a waiting period after a recent purchase or refinance. It varies by lender, so a home you bought recently may need a different path.
Condo and unit types. Two lanes accept non-warrantable condominiums, but an addition on a condo is rarely a question. Most additions and ADUs involve a house on its own lot.
Self-employed borrowers. Plenty of ADU builders run their own businesses. Documentation paths differ by lane, so start the conversation with your income type on the table, not your project.
Paying for the Build From a Lump Sum
Getting cash at closing is not the same as having a funded construction plan. With no lender draws, you carry the discipline.
Contractors typically ask for a deposit and then bill at milestones. You pay them from your account. If costs rise, the loan does not grow to meet them. Build in a cushion for overruns before you decide how much to borrow, and keep it separate from your reserves.
On reserves: lenders measure them in months of the full payment, and the requirement rises with the loan amount. Whether cash-out proceeds count toward reserves varies by lane. Ask before you assume the answer, because spending the proceeds on construction can leave you short.
Timing matters too. Permit approval and the appraisal can both stretch the schedule. Some borrowers permit first, so they know the project is allowed before they refinance. Others refinance first, which locks in funding but risks owning cash for a project the city may reshape. Neither order is right for everyone. The stronger play is usually permit-ready plans before the file goes in, though borrowers racing a contractor’s calendar may argue the other way.
One practitioner pattern worth knowing: across the jumbo files Lendmire arranges, the ones that stall are rarely about credit. They stall when the project budget quietly exceeds what the equity can deliver, or when the ADU’s legal status is unclear. A one-page budget next to a rough equity estimate saves weeks of rework.
Documents to Gather
Here is the practical checklist, in the order lenders usually ask.
- Income documents: pay stubs, W-2s and tax returns, or the self-employed path the lane uses.
- Asset statements for reserves and any funds you plan to hold back.
- Current homeowners insurance.
- Plans, a scope of work and contractor bids.
- Permits, or proof of where you stand in the permit process.
- A contractor license or insurance, if the lender requires it.
An addition may raise your assessed value and the replacement cost on your insurance. Both sit outside the loan, but both change your budget.
Key Terms Defined
Conforming loan limit: The maximum loan size Fannie Mae and Freddie Mac can buy, set yearly by the FHFA and higher in high-cost counties. Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.
Cash-out refinance: A new mortgage that pays off your old one and gives you cash beyond that, secured by your home’s equity.
LTV and CLTV: Loan-to-value divides your loan by the home’s value. Combined loan-to-value adds any second loan to the first.
As-is value: What the appraiser says the home is worth in its current condition, before any construction.
As-completed value: An estimate of the home’s worth after planned work, based on plans and comparable sales.
Reserves: Cash and liquid assets you still hold after closing, measured in months of your full payment.
Rescission: The three-business-day window to cancel certain refinances of a primary home.
What Your Decision Looks Like
Most borrowers face three questions in order. First, does the equity you have today cover the project at the lane’s cash-out leverage? If yes, a standard jumbo cash-out is the simple path. If the equity falls short, a renovation-style product that values the finished home may close the gap, or a smaller scope might. Second, do you want to replace your current first mortgage at all? If not, price a second loan alongside. Third, can you handle the cash discipline of a lump sum, including the overrun cushion and reserves?
Cost deserves a plain mention. Closing costs on a refinance typically include the appraisal, title, lender fees and prepaid items. The CFPB’s Owning a Home hub explains the Loan Estimate and Closing Disclosure, which let you compare offers line by line. Compare the full terms, not a single number.
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 a jumbo cash-out refinance to build an ADU?
Yes, on a standard cash-out the use of funds is generally your choice, though the lender will review your plans and permits. The loan is sized on today’s value, so the ADU does not add borrowing power until it is built. Detached units and unusual lots can draw extra questions, and eligibility is subject to lender guidelines and full file review.
Will the appraisal include the finished addition?
Usually not on a standard cash-out, which uses the as-is value. Renovation-style products often use an as-completed value instead. Ask which method the lane uses before you commit to plans, because it decides how much cash the equity can support.
Does projected ADU rent count toward qualifying?
Often it does not. Agency rules allow limited use of ADU rental income in certain cases, but jumbo lenders frequently decline to count income from a unit that does not yet exist. Treatment varies by lender, so plan to qualify without it.
How much equity do I need?
Enough that the cash-out leverage cap, applied to your current appraised value, leaves room above your existing balance for the full project budget. Leverage tops out at 90% LTV on the headline lane, cash-out runs lower than purchase, and some lanes stop at 80%. Largest lanes also carry a cash cap. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
Is a jumbo cash-out better than a HELOC for an addition?
It depends on your current first mortgage. A cash-out replaces the whole loan, which suits you if you want one new loan and have deep equity. A HELOC or home equity loan leaves your first mortgage alone, which can suit you if you want to keep it.
For your own numbers, request a scenario review with Lendmire.
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.
For current guidelines, see jumbo loan programs.
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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. Fannie Mae Selling Guide B2-1.3-02: Limited Cash Out Refinance Transactions
2. CFPB: How Long Do I Have to Rescind When Does the Right of Rescission Start
3. CFPB: Can I Ever Waive My Right to Rescind on My Mortgage Loan
4. Fannie Mae: HomeStyle Renovation
This article is part of Lendmire’s jumbo cash-out refinance program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Does Every Trustee Have to Sign a Jumbo Cash-Out Refinance? · Jumbo Cash-Out Refinance Requirements on a Property With Unpermitted Work · Best Jumbo Cash-Out Refinance Program for a Business
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
Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.