The Quick Read: A mortgage is jumbo when the loan amount sits above the conforming limit for the county where the home is located. A new build adds a second layer, because the appraisal, builder contract and delivery date all feed the file. Across the wholesale programs Lendmire places files with, the headline lane starts at a 660 decision score, goes to 90% leverage on select lanes, and reaches $5,000,000 on the largest ones. All of it is subject to lender guidelines and full file review.
Key Takeaways
- Loan amount sets “jumbo,” not purchase price. A bigger down payment can pull a loan back under the county limit.
- On a new build, the appraisal at completion and the builder’s timeline decide more files than the credit score does.
- Buying a finished or nearly finished builder home is an ordinary purchase mortgage. Building to order is a different structure.
- Reserves and appraisal requirements scale with the loan amount.
- Builder incentives are capped by whichever lender funds the loan, and the caps differ from lender to lender.
What Makes a Loan “Jumbo”?
A jumbo loan is a mortgage above the conforming loan limit. The Federal Housing Finance Agency (FHFA) sets that limit each year. It is the largest loan Fannie Mae and Freddie Mac can buy. Per the FHFA’s annual announcement, the baseline moves with average U.S. home prices. Counties with higher home values get a higher limit, capped at 150 percent of the baseline.
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.
Three practical points follow from that.
First, the limit is county-specific. The same loan can be conforming in one county and jumbo in the next one over. The FHFA publishes a county-by-county lookup. Check it before assuming your loan is jumbo.
Second, the limit applies to the loan, not the price. Put more down and the loan may land under the line. Put less down and the same home becomes a jumbo purchase.
Third, the limit does not fall when prices fall. It only rises. A loan that was jumbo last year may be conforming this year, so the file should be tested against the current figure.
Jumbo loans cannot be sold to the agencies. Each wholesale lender sets its own overlays on credit, reserves, ratios and appraisals. That is why two lenders can look at the same borrower and ask for different things.
Why Growing Families End Up Here
Families who buy a higher-end new build tend to land in jumbo territory for ordinary reasons. They want more bedrooms, a better school zone, or a lot big enough for the next ten years. New construction in a desirable area often prices above resale nearby.
The file looks different from a typical high-net-worth jumbo. Income may be rising but not yet fully documented at the new level. A baby on the way or a pending job change changes the debt picture. The existing home may not have sold yet. Those are the points that draw the underwriter’s attention.
How a Jumbo Purchase Is Underwritten, Step by Step
The sequence below is the one these files follow on the wholesale side.
1. Size the loan against the county limit. Compare the loan amount, not the price, to the limit. If it is above, the file goes to a jumbo lane.
2. Match the file to a lane. The headline lane starts at a 660 decision score. Leverage reaches 90% on select lanes (several reach 89.99% combined LTV), and the rest stop at 80%. Loan amounts run to $5,000,000 on the largest lanes. Higher leverage and larger loans come with tighter overlays.
3. Test the ratios. The fixed-rate lanes carry a 50% ratio ceiling. The adjustable lanes are 45%, and the interest-only lanes are 43%. The ratio compares your monthly debts, including the new housing payment, to your income.
4. Verify income, assets and reserves. Lenders must make a reasonable, good-faith decision that you can repay. That means verifying income or assets and counting debts. Child care is a budget item, but court-ordered child support counts as a debt or as income, depending on which side you are on. Reserves are measured in months of the full payment, and the number rises with the loan amount.
5. Review the builder contract and plans. For a home not yet complete, the lender reads the sales contract, the specification sheet, the upgrade schedule and the builder’s delivery estimate.
6. Order the appraisal. Above a lane’s threshold amount, two appraisals are required. The appraiser values the home at completion, based on plans and specs when the build is unfinished.
7. Clear conditions and reconcile the settlement. Before closing, the lender confirms final value, completion where applicable, and that the builder credits fit the lender’s limits. The Loan Estimate and Closing Disclosure show the numbers, and they should be reconciled against the contract.
Buying From a Builder vs. Building to Order
The word “new build” covers two different loans. Getting this wrong is a common reason a file stalls.
| Factor | Finished or spec home | Built to order |
|---|---|---|
| Loan type | Standard purchase mortgage | Construction financing |
| Appraisal basis | Completed home or near-complete | Plans, specs, value at completion |
| Payments | Start after closing | Interim phase, then permanent loan |
| Documentation | Contract, income, assets | Adds plans, budget, builder review |
| Main risk | Low appraisal, concession caps | Conversion, delays, re-qualifying |
If you are buying a finished or nearly finished home from a production builder, the lender treats it as a purchase. That is the lane the jumbo programs described here are built for.
Building to order is different. The Consumer Financial Protection Bureau (CFPB) describes a construction loan as a short-term loan that funds the build in advances as work progresses. It also says the borrower may be able to convert to a standard mortgage, but if the loan does not convert automatically the borrower may have to reapply. Whether a lender offers a single-close or two-close structure depends on the investor, so confirm that before signing a build contract.
For a closer look at how lenders treat a primary residence under construction, see Lendmire’s guide Jumbo Loan Requirements for Buying New Construction as Your Primary Home.
The Appraisal Is the Pressure Point
On a new build, the appraisal does more work than any other document. Three things go wrong most often.
Comparable sales are thin. New subdivisions often lack closed sales of similar homes. The appraiser may reach outside the neighborhood, and the value can come in below contract price. Builders also price upgrades above their appraised contribution.
The gap becomes your cash. When value lands under price, the lender lends against the lower number. You cover the difference or renegotiate. That is why post-closing reserves matter as much as the down payment.
Reconsideration is a routine step. A well-documented reconsideration request, with recent nearby sales and condition or quality adjustments, can recover value when the first report missed relevant comps. It is a review of the original appraisal, not a second one.
A lender’s own two-appraisal requirement is a matter of lender policy. The federal two-appraisal rule is narrower. The CFPB’s higher-priced mortgage appraisal guide ties that rule to resale (“flip”) cases, and a home bought directly from a builder rarely triggers it. You also receive a free copy of any appraisal, so ask for it and read it.
Builder Incentives: Where the Rules Change
Builders often offer closing-cost credits, rate buydowns or upgrade packages, usually tied to their preferred lender. They can help. They also have limits.
Fannie Mae’s conforming rules, for example, allow temporary buydowns on principal residences and second homes, but the terms must be disclosed to the appraiser and interested-party contribution limits still apply. You can read those in Fannie Mae’s Selling Guide. A jumbo loan is not bound by those rules. The lender or investor sets its own concession caps, and they can be tighter or structured differently.
Concessions are also measured against the lower of price or appraised value. A low appraisal therefore shrinks the credit the lender will accept and can raise your cash need at the same moment. Get the lender’s concession limit in writing before you sign a contract that depends on a builder credit.
Structures: Fixed, Adjustable and Interest-Only
The wholesale jumbo lanes come in three structures: fixed, adjustable and interest-only.
- Fixed payments stay put. These lanes carry the highest ratio ceiling, at 50%.
- Adjustable structures start with a fixed period and then reset. The ratio ceiling drops to 45%.
- Interest-only structures defer principal for a set period. The ceiling is 43%.
For a growing family, a structure choice is a budget decision first. A payment that fits now should still fit when a second child is in day care and one income dips. Ask how the structure behaves in year six, not only year one.
Occupancy also changes the leverage. Primary residences carry the best terms, and second-home and investment occupancy sit at lane-specific leverage. Cash-out refinances run at lower leverage than purchases, with a cash cap on the largest lanes. Non-warrantable condominiums are accepted on two lanes, which matters if the “new build” is a condo project.
Where the General Rule Breaks
A few cases surprise borrowers.
- High-cost county. A pricey home can be conforming in a high-cost county and jumbo in a lower-cost one. Same home, different loan.
- A down payment that crosses the line. Moving the loan under the county limit can mean agency pricing and rules apply. It can also mean a smaller cushion in the bank. Weigh both.
- A construction loan that does not convert. The permanent loan may require a new application, which means income, credit and appraisal are checked again at completion.
- Delayed delivery. If the home is not ready by the time the rate lock ends, extensions can add cost. Ask about lock length against the builder’s delivery estimate before committing.
- A new baby or job change after pre-approval. Income and debts are verified at underwriting, not at the first conversation. A pause in income during a final check can change the answer.
- The 43% rule. Older articles treat 43% as a federal cap on debt-to-income. The qualified-mortgage test is now price-based, and each lender sets its own ratio ceiling. The 43% figure survives only on the interest-only lanes described above.
What the Decision Looks Like in Practice
Picture a family buying a nearly finished builder home. The loan sits just above the county limit. They could put more down to bring it under the limit, but that would leave thin reserves with a new baby on the way.
They compare three paths: stay conforming with a larger down payment, go jumbo with moderate leverage, or go jumbo at higher leverage and keep more cash. The test is not which payment looks smallest. It is whether the budget survives a bad month, and whether reserves cover the gap if the appraisal lands low.
In the file, the checklist looks like this.
- Current credit, with no new debt opened after pre-approval.
- Income documents that match the amount stated on the application.
- Asset statements covering the down payment, closing costs and reserves.
- The signed builder contract, the upgrade schedule and the specification sheet.
- A written note of the builder’s concession and the lender’s limit on it.
Lendmire’s piece How to Get a Jumbo Loan for a New Build on High W-2 Income covers the income-documentation side.
Key Terms Defined
Conforming loan limit: The largest loan Fannie Mae and Freddie Mac can buy, set by the FHFA each year and varying by county.
Non-conforming loan: Any loan above that limit or otherwise outside agency rules. A jumbo is the most common type.
Reserves: Liquid assets left after closing, counted in months of the full housing payment.
Appraisal at completion: A value opinion for a home not yet built, based on plans and specifications.
Concession: A credit from the builder or seller toward closing costs or a buydown. Lenders cap it.
Reconsideration of value: A request that the appraiser review the report with added comparable sales. It is not a second appraisal.
Construction-to-permanent loan: Financing that covers the build and then converts to a long-term mortgage.
Where Jumbo Pricing Sits Against Conforming
Some sources report that jumbo loans cost modestly more than conforming ones. Others say the gap has narrowed. Neither is a promise about your file. Pricing depends on the lender, the lane, your leverage and your credit, and the Loan Estimate is where the actual cost appears. Compare Loan Estimates from more than one source side by side.
Mortgage insurance works mechanically here as on any loan. Leverage above a lane’s threshold may require insurance or a different structure, depending on the lender. Ask which applies before assuming it will be waived.
Questions to Ask Before You Sign the Builder Contract
- What is the lender’s cap on builder credits, and is it measured against price or appraised value?
- What happens if the appraisal comes in under contract price?
- How long is the rate lock, and what does an extension involve?
- Does the loan require two appraisals at my amount?
- If I am building to order, does the loan convert on its own or do I reapply?
- Which documents expire during construction, such as bank statements and pay stubs?
If the builder’s preferred lender cannot answer these in writing, get a second opinion from a broker who can shop several lanes.
Frequently Asked Questions
Do I need a jumbo loan if the home is a new build?
Only if the loan amount is above the county’s conforming limit. Whether the home is new or resale does not change that test. A larger down payment can bring the loan under the limit, and a high-cost county has a higher limit, so check your county’s figure on the FHFA lookup before planning around jumbo.
What credit score and down payment do jumbo loans on a primary home require?
Across the wholesale lanes Lendmire places files with, the headline lane starts at a 660 decision score. Leverage reaches 90% on select lanes, with several at 89.99% combined LTV and the rest capped at 80%. Reserves and appraisal requirements rise with the loan amount.
How large can a jumbo loan be?
The largest wholesale lanes go to $5,000,000. Smaller lanes cap lower, and the highest loan amounts come with the strictest leverage and reserve requirements. The fixed-rate lanes carry a 50% ratio ceiling, the adjustable lanes 45%, and the interest-only lanes 43%. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.
What happens if the new build appraises below the contract price?
The lender lends against the lower value, so you cover the difference or renegotiate with the builder. Builder credits can shrink too, since concessions are measured against the lower of price or value. A reconsideration request with recent nearby sales can help when the comps were thin.
Can I use a jumbo loan if I am building to order?
Construction financing is a different product from a purchase mortgage. The CFPB notes a construction loan may not convert automatically, and you may have to reapply. Ask whether a lender offers single-close or two-close structures before you sign the build contract.
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. You can start with Lendmire’s jumbo loan programs page. 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.
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.
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References
1. Federal Housing Finance Agency (FHFA): conforming loan limit announcement
2. FHFA: county-level conforming loan limit data
3. Consumer Financial Protection Bureau (CFPB)
4. Consumer Financial Protection Bureau: HPML appraisal rule guide
5. Fannie Mae Selling Guide: temporary interest rate buydowns
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 Requirements for Buying New Construction as Your Primary Home · Can a Move-Up Buyer Use a Jumbo Loan on a New-Construction Primary Home? · Should a Jumbo Borrower Refinance to Lower the Payment?
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.