The Quick Read: A ground-up build usually runs through a construction-to-permanent loan. The lender pays your builder in stages as work is finished. When the house is done, the loan turns into a regular jumbo mortgage. Jumbo status depends on the loan amount in your county, not the sticker price of the project. The hard parts are the appraisal on a house that does not exist yet, the cash you need during the build, and what happens to your current home’s mortgage.
Key Takeaways
- A loan is jumbo when it starts one dollar above your county’s conforming limit. That limit resets every year, so check it before you plan.
- A build loan is not a normal purchase loan. Money is released in draws, and you usually pay interest only on what has been advanced.
- One-close loans lock the permanent terms up front. Two-close loans make you qualify twice.
- Your current mortgage payment still counts when the lender looks at your ratios.
- Plan for cash beyond the down payment: contingency, interest during the build, and overlap with your old housing cost.
When Does a Move-Up Build Become a Jumbo Loan?
A build is jumbo when the loan amount lands above the conforming limit for the county where you are building. Purchase price does not decide it. A loan that is jumbo in one county can be conforming in the next county over.
Jumbo payment estimate
The starting figures are an example price in the jumbo range with ten percent down on a thirty-year fixed. Replace them with yours.
Editable benchmark: 7.32% as of October 22, 2026 · Freddie Mac 30-year average via FRED®. A conventional market reference, not a jumbo loan quote.
Illustrative starting assumptions: a $1,000,000 price in the jumbo range, ten percent down on the top-leverage lane, 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 loan quote; jumbo rates are set by the lender and the lane at lock and differ from the conforming benchmark. An adjustable-rate scenario is shown at the benchmark for the whole term; the rate after the initial period is unknown. Reserve months and appraisal counts follow the lane sheet for the amount band; the automated finding may require more. Taxes, insurance and dues are editable estimates; closing costs are not included. On most lanes the conforming limit for the county decides whether a loan is jumbo at all; two lanes start at a stated dollar floor instead. Licensed in sixteen states for consumer mortgages.
That is why jumbo is a size category, not a government program. Each lender or investor sets its own credit, reserve, and leverage standards above the limit.
Here is the envelope I work in every week. Across the wholesale jumbo loan programs Lendmire places files with, the headline lane starts at a 660 decision score. Leverage reaches 90% on the top lanes, and several lanes stop just short of that at 89.99% combined loan-to-value. The rest stop at 80%. Loan amounts run up to $5,000,000 on the largest lanes. The ratio ceiling is 50% on the fixed lanes, 45% on the adjustable lane, and 43% on the interest-only lanes. Every figure is subject to lender guidelines and full file review, and none of it is a commitment to lend.
One honest caveat. Those lanes describe permanent jumbo mortgages. Construction adds its own layer of lender rules, and each lender decides how much of that envelope applies to a build. Ask for the construction overlays in writing before you pay for plans.
If you are still deciding which lane your file fits, Lendmire’s piece How to Move Up a Jumbo Loan Lane Before You Apply covers the levers you control.
How Is a Build Loan Different From Buying a Finished Home?
A build loan funds a house that is not finished, so the lender takes on risk a normal purchase never carries. The loan is released in stages, the value is a forecast, and a builder’s performance becomes part of your credit story.
| Factor | Finished-home jumbo | Move-up build |
|---|---|---|
| Collateral | Existing house | Plans and a partly built house |
| Funds released | All at closing | In draws as work is done |
| Payment during the term | Full payment from day one | Interest on advanced funds only |
| Value basis | Comparable sales | Expected value at completion |
| Extra approvals | Home inspection | Builder, plans, budget, draw inspections |
Interest accrues only on money already advanced, so your payment starts small and grows with each draw. The CFPB describes construction loans as short-term, usually carrying higher interest costs than a longer-term purchase mortgage. Budget for that climb. Do not judge the early months by the first payment.
One-Close, Two-Close, or Construction-Only?
You pick one of three structures, and the choice decides how many times a lender re-examines you. One-close is the cleanest for most owner-occupants. Two-close gives flexibility at the price of a second approval.
| Structure | Closings | Permanent terms set | Re-qualify at completion? |
|---|---|---|---|
| One-close (construction-to-permanent) | One | At the start | Generally no, if conditions were met |
| Two-close | Two | After the build | Yes, a full second file |
| Construction-only | One, then payoff | Not applicable | You arrange your own payoff |
In a one-close loan, you close once on the construction phase and the permanent mortgage together. The lender manages payments to the builder. When construction ends, the loan converts on terms the documents already set. Fannie Mae’s single-closing rules describe this model. Those rules govern loans sold to Fannie Mae. A jumbo build loan is usually held by the lender or sold to private investors, so treat the agency rules as a template. The jumbo lender’s own guidelines control.
Two-close means you go through the process twice. If your income, credit, or the market shifts mid-build, you face the second approval under those new conditions. That is the real cost of the extra flexibility.
Construction-only loans end with a payoff. You need a permanent loan lined up or cash on hand. If the loan does not convert automatically, you may have to reapply.
How Does the Money Move During the Build?
The lender releases funds against finished work, and inspectors confirm progress before each draw. You are not handed a lump sum. The builder is paid in steps, and you carry interest on whatever has been advanced so far.
Here is the sequence on a typical file:
1. You close, and the lender sets the budget and draw schedule.
2. The builder starts work, usually using the first draw for site and foundation.
3. An inspector confirms each stage is complete.
4. The lender releases the next draw, and your interest-only payment steps up.
5. When the home is finished, a completion report or appraisal update confirms the value.
6. The loan converts to the permanent jumbo mortgage, or you pay it off.
Cost overruns are where files get stressed. A change order that adds cost does not automatically add loan amount. The lender sizes the loan against the lower of cost or appraised completion value. If the appraisal comes in below cost, the gap becomes your cash. A contingency cushion held in reserve can help protect the file if costs rise.
What Do Lenders Review on a Jumbo Build?
Lenders review the same things as on a jumbo purchase, plus the construction risk. That means credit, income, assets, reserves, and ratios, then the builder, the plans, the budget, and the completion value.
On the permanent side, here is what I see across the wholesale lanes:
- Credit. The headline lane starts at a 660 decision score. Lenders set a higher floor.
- Leverage. Up to 90% on the top lanes, with others capped at 80% or just under 90%. Occupancy matters: primary residence, second home, and investment property each carry lane-specific leverage.
- Ratios. Your total debt payments against income. The ceiling is 50% on fixed lanes, 45% on adjustable, 43% on interest-only.
- Reserves. Measured in months of the full payment. They rise as the loan amount rises.
- Appraisals. Above a lane’s threshold amount, two appraisals are required.
On the construction side, expect a vetted builder, a signed contract with a detailed budget, plans and specifications, and a lender-approved draw process. Custom homes without nearby comparable sales can make the appraiser’s job harder. That is where files stall.
Self-employed borrowers should ask which documentation the lender wants for the permanent phase. Plan to document the same income at conversion, because lenders verify again before the loan turns permanent.
Lenders also check the debt you already carry. If you are selling your current home, they want to see how that mortgage is handled. Which brings up the question most move-up builders worry about.
What Happens to Your Current Home?
Your current mortgage keeps counting until it is paid off, and a build takes long enough that you must plan for it. You have three realistic paths.
| Path | How it works | Main pressure point |
|---|---|---|
| Sell first | Proceeds fund the lot and down payment | You need temporary housing |
| Sell near completion | Carry both homes during the build | Two housing costs and a higher ratio |
| Sell after move-in | Keep the old home until the new one is ready | Longest overlap, most cash tied up |
Sell-first is the simplest for qualifying, since the old payment is gone. It costs you a place to live during the build. Carrying both homes feels comfortable, but the lender counts the old payment against your ratios. A bridge loan of 12 months or less is a separate product, and it should not be confused with the construction loan.
If you already own the lot, say so early. Owner-of-record status can change how the loan is treated, since Fannie Mae processes single-close deals as purchases or limited cash-out refinances. Cash-out on a jumbo lane sits at lower leverage than purchase, with a cash cap on the largest lanes. That matters if you pull equity out of the lot to fund the build.
A Move-Up Build, Start to Finish
Say a household owns its home with meaningful equity and wants a larger house on a lot it is buying. Here is how the money maps out in plain terms.
| Cash need | Where it comes from |
|---|---|
| Lot purchase | Equity from the current home, or savings |
| Down payment on the build | Sale proceeds or savings, set by the lane’s leverage |
| Builder draws | Construction loan advances |
| Interest during the build | Monthly out-of-pocket, rising with each draw |
| Contingency for overruns | Cash held outside the loan |
| Overlap housing cost | Income, until the old home sells |
| Reserves after closing | Liquid assets, counted in months of payment |
The permanent payment arrives only at conversion. Until then, your payment tracks the draws. The mistake I see most often is a household that planned for the down payment and forgot the interest carry and the overlap.
Where the General Rule Breaks
The standard path has exceptions, and each one changes the plan. Here are the ones that matter most.
The limit applies to the original balance. Whether a loan is jumbo is judged against the county limit on the original loan balance, which FHFA sets each year by formula, with higher limits in high-cost counties and separate limits in Alaska, Hawaii, Guam, and the U.S. Virgin Islands. A loan near the line can tip either way, so confirm your county’s current limit before you commit to a structure.
Construction phases that run long. Fannie Mae’s single-closing template allows no single construction period over 12 months and no more than 18 months in total. A jumbo lender can set different limits. If your custom plan needs longer, ask whether the lender extends or whether you must refinance mid-build.
Attached condos and co-ops. Under Fannie Mae’s overview of construction-to-permanent financing, attached condo units and co-ops are ineligible. Detached units in a condo project are allowed, subject to project review. Jumbo lenders have their own rules here, so ask rather than assume.
Teardown and rebuild. Single-close construction can fund tearing down an older home on your lot and building new. The existing structure’s value and any payoff become part of the file.
Appraisal shortfall. A custom design with no good comparable sales can appraise below cost. You cover the difference in cash, or you redesign.
Rate timing differs by structure and lender. Some one-close programs let you lock the permanent terms at closing. Others let lenders adjust certain terms at conversion. A jumbo lender may or may not offer that flexibility. Get the answer in writing.
A Short Note on the Rules
Construction financing has one regulatory quirk worth knowing. The federal ability-to-repay rule, in 12 CFR 1026.43, exempts a construction phase of 12 months or less. That exemption covers only the construction phase. The permanent mortgage is underwritten in the ordinary way, and lenders still verify your file at conversion.
In practice, the exemption means the main protection is the lender’s own underwriting and your own math. Test affordability yourself, including the months when you carry two housing costs. Your Loan Estimate and Closing Disclosure may come as one combined set or as separate sets for each phase, depending on how the lender structures the loan.
Is This the Right Path for You?
A jumbo build works when you want a specific home that the resale market does not offer and you can fund the overlap. It is the wrong tool when you need a fixed move date or have thin cash reserves.
Lean toward building when:
- You own the lot or have a clear equity source for it.
- You have a vetted builder and a budget with a real contingency.
- Your ratios hold up with the overlap payments included.
Lean toward buying a finished home when:
- Your timeline is tight and a delay would hurt.
- Your cash is committed to the down payment with little left for overruns.
- The custom design has no comparable sales nearby.
Whichever way you lean, run the cash plan before the design plan. Pick the structure second.
Key Terms Defined
Jumbo loan: A mortgage whose amount is above the conforming limit for the county where the home sits.
Construction-to-permanent loan: One loan that pays for the build, then converts into a regular long-term mortgage.
Draw: A release of loan money to the builder after a stage of work is finished and inspected.
Conversion: The point when the construction loan becomes the permanent mortgage.
Combined loan-to-value (CLTV): All loans secured by the home, divided by its value.
Reserves: Liquid assets left after closing, measured in months of the full housing payment.
Contingency: Cash set aside outside the loan to cover cost overruns and change orders.
Next Step
If you are buying a home and want to see whether a jumbo loan fits your file, Lendmire can help you compare the options and what each one asks of the file. Bring your lot situation, your current mortgage, and a rough budget. The comparison starts there.
Frequently Asked Questions
Can I use a jumbo loan if I already own the land?
Yes, in many cases. Owning the lot can reduce the cash you need and may change how the file is treated, since agency single-close deals can be processed as limited cash-out refinances. Pulling equity out of the lot is cash-out, and cash-out sits at lower leverage than purchase on the jumbo lanes. Every detail is subject to lender guidelines and full file review.
Do I have to sell my current home first?
No, but you must qualify with the old payment still counted if you keep it. That raises your ratios during the overlap. Selling first removes the payment from the file but leaves you with temporary housing. Many borrowers sell near completion and plan cash for the carry.
What if the appraisal comes in below my building cost?
The lender sizes the loan against the lower of cost or appraised value, so the gap becomes your cash. You can bring more cash, renegotiate the budget, or adjust the plans. Custom homes with few comparable sales are the most exposed. A contingency cushion helps absorb it.
Does a one-close loan mean my terms are fixed from day one?
Not always. Some programs set the permanent terms at the start. Jumbo lenders write their own rules, so ask which terms are locked and which can change.
How is a jumbo build different from a jumbo purchase?
A purchase loan funds a finished house at closing. A build loan releases money in draws, bases value on the expected finished home, and adds builder and budget review. The permanent phase then looks like any jumbo mortgage, with credit, reserves, and ratios checked again at conversion.
For your own numbers, request a scenario review with Lendmire.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage broker licensed for consumer lending in 16 states. Lendmire arranges FHA, VA, conventional and jumbo purchase and refinance loans through wholesale lenders; every file is underwritten by the lender under the applicable program guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. CFPB
2. Fannie Mae Selling Guide B5-3.1-02, single-closing transactions
3. FHFA conforming loan limit announcement
4. Fannie Mae Selling Guide B5-3.1-01, construction-to-permanent overview
5. 12 CFR 1026.43, ability-to-repay rule text (govinfo)
This article is part of Lendmire’s jumbo loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Jumbo Loan Title Changes Before or After Closing · How to Refinance a Jumbo Loan After Divorce on One Income · How to Decide If a Jumbo Loan Refinance Is Worth It
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.