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The Ultimate Custom Home Construction Loan Guide
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A custom home construction loan pays your builder in stages while the house goes up, then becomes, or is replaced by, a regular mortgage when the home is finished. Lenders size the loan from your total project cost and the home's appraised "as completed" value, then subtract your contribution, which can be cash, land equity or both.
This guide follows a custom build from the land to the final mortgage. It covers the loan types, the math lenders use, what you need at each step and where projects usually stall. Two worked examples, a $750K home and a $1.5M home, run through the whole guide.
Key takeaways
- Most custom homes are financed with a construction-to-permanent loan, closed once or twice.
- Lenders look at three things together: you, your builder and the project.
- Your contribution is measured against total cost, which is land plus construction plus soft costs.
- Land you already own often counts toward your contribution.
- The finished-value appraisal can make or break the budget, so plan for it early.
What is a custom home construction loan?
A custom home construction loan is short-term financing that funds a home built to your plans on a specific lot, paid out in draws as work is completed. During construction your payments usually cover interest on the amount drawn so far, and the loan converts to, or is paid off by, a permanent mortgage at the end.
A custom home is different from a spec or tract home. With a spec home, the builder owns the land, finances the build and sells you a finished house with an ordinary purchase mortgage. With a custom home, you own or buy the land, you hire the builder and you carry the financing during construction. That shift is why lenders review so much more than your credit and income.
The U.S. Census Bureau tracks these homes as "contractor-built" houses. Its Survey of Construction definitions explain how it prices them: "Finally, because the house is being built for the owner's occupancy on the owner's own land, the contract price does not include the cost of the land." That is a useful reminder for your own budget. The builder's contract is only one part of what you are financing.
How common is this path? As of the Census Bureau's 2025 annual data, published July 1, 2026, about 131,000 contractor-built single-family homes were started in the United States in 2025 (Census Characteristics of New Housing highlights). That makes custom building a well-trodden path, even if it feels new to you.
Which loan types can finance a custom home?
Most custom homes are financed with a construction-to-permanent loan, also called a one-time-close or single-close loan, or with a two-time-close setup where a construction loan is later paid off by a separate mortgage. Government-backed versions exist through FHA, VA and USDA for borrowers who qualify.
| Loan type | How it works | Often a fit when |
|---|---|---|
| One-time close (construction-to-permanent) | One application, one closing; the loan converts to a mortgage when the home is done | You want one set of closing costs and certainty about the permanent loan |
| Two-time close | A construction loan closes first; a separate mortgage pays it off at completion | You want to shop the permanent mortgage later or need a more flexible construction phase |
| Jumbo construction | Either structure, for amounts above the conforming limit for your county | Larger budgets, high-cost areas |
| FHA, VA or USDA construction | Government-backed one-time close programs with their own rules | You meet the program's eligibility, occupancy and property rules |
| Land and construction combined | The lot purchase and build are financed together | You haven't bought the land yet |
Fannie Mae's single-closing rules (Selling Guide B5-3.1-02) describe the one-time-close idea plainly: "Because the loan documents specify the terms of the permanent financing, the construction loan will automatically convert to a permanent long-term mortgage loan upon completion of the construction."
For two closings, Fannie Mae's two-closing rules (B5-3.1-03) add an important point: "The lender that provides the permanent long-term mortgage may be a different lender than the one that provided the interim financing."
Federal disclosure rules recognize both structures too. Regulation Z, at 12 CFR 1026.17, says: "When a multiple-advance loan to finance the construction of a dwelling may be permanently financed by the same creditor, the construction phase and the permanent phase may be treated as either one transaction or more than one transaction."
For a deeper comparison, read one-time close vs. two-time close construction loans and what happens if rates change between closings. If you are weighing a government program, start with FHA construction loan requirements or VA construction loan requirements.
How do lenders decide how much you can borrow?
Lenders cap the loan at a share of the lesser of your total project cost or the home's appraised "as completed" value, then check that you can afford the payment. Your contribution covers the gap between that cap and your total cost.
Two ratios do most of the work:
- Loan-to-cost (LTC): the loan divided by the total project cost.
- Loan-to-value (LTV): the loan divided by the appraised "as completed" value of the land and finished home. Fannie Mae's Selling Guide covers the calculation in B2-1.2-01, Loan-to-Value (LTV) Ratios (checked November 2026).
Fannie Mae's single-closing guidance defines the cost side for a purchase as "the purchase price (sum of the cost of construction and the sales price of the lot)" and has lenders compare it with the "as completed" appraised value (Selling Guide B5-3.1-02). When you already own the lot, the same section measures the loan against the "as completed" appraised value of the lot and improvements.
Lenders then underwrite you on the finished mortgage, not just the construction phase. Fannie Mae's guidance says: "The lender must underwrite a single-closing construction-to-permanent loan based on the terms of the permanent financing." Expect the lender to look at your credit, income, debts and the savings you will have left after closing. Our guides to construction loan credit scores and how much you can borrow go deeper on qualifying.
What counts as total project cost?
Total project cost is everything needed to deliver the finished home: the land, the builder's contract and the soft costs around it. Leaving items out is the most common reason budgets fail at underwriting.
- Land price, or for land you own, its value or your cost (lenders differ)
- Builder contract, including allowances
- Site work: clearing, driveway, utilities, well and septic if needed
- Architect, engineering, survey and permit fees
- Contingency, often a set share of hard costs
- Interest during construction, if the lender builds in an interest reserve
- Closing costs, if the program lets you finance them
Use the construction contingency calculator to size a cushion before you finalize the number you give lenders.
How does the math work on a $750K custom home?
On a $750K custom home where a lender would lend up to $600K, your contribution would be $150K. If you already own the land outright and it is worth $150K, that equity can cover the whole contribution.
Here is the full worked example. All figures are illustrations, not quotes or approvals.
Scenario A: buying the lot as part of the project
| Step | Item | Amount |
|---|---|---|
| 1 | Lot purchase price | $150,000 |
| 2 | Builder contract, site work and soft costs | $600,000 |
| 3 | Total project cost (1 + 2) | $750,000 |
| 4 | Appraised "as completed" value | $775,000 |
| 5 | Lesser of cost or value | $750,000 |
| 6 | Example maximum loan share | 80% |
| 7 | Maximum loan (5 × 6) | $600,000 |
| 8 | Your contribution (3 − 7) | $150,000 |
| 9 | Plus closing costs and reserves | Paid separately unless financed |
Scenario B: you already own the lot free and clear
| Step | Item | Amount |
|---|---|---|
| 1 | Land value used by the lender | $150,000 |
| 2 | Construction and soft costs | $600,000 |
| 3 | Total project value or cost | $750,000 |
| 4 | Loan needed to fund the build | $600,000 |
| 5 | Loan share (4 ÷ 3) | 80% |
| 6 | Cash contribution needed | None beyond closing costs and reserves |
In Scenario B, the land is doing the job a cash down payment would do. That is why owning your lot is one of the strongest positions a custom home borrower can be in. The land equity construction loan calculator runs this math with your own numbers, and our article on financing a $750K custom home walks through the scenario in more detail.
How does the math work on a $1.5M custom home?
On a $1.5M custom home, the site's maximum loan of $1.375M means at least $125K must come from land equity or cash, and most lenders will expect more. In the example below, the loan is $1.2M and the contribution is $300K.
Scenario C: $1.5M project, lot purchased with the loan
| Step | Item | Amount |
|---|---|---|
| 1 | Lot purchase price | $350,000 |
| 2 | Construction and soft costs | $1,150,000 |
| 3 | Total project cost | $1,500,000 |
| 4 | Appraised "as completed" value | $1,525,000 |
| 5 | Lesser of cost or value | $1,500,000 |
| 6 | Example maximum loan share | 80% |
| 7 | Loan at that share | $1,200,000 |
| 8 | Contribution (3 − 7) | $300,000 |
| 9 | Check: loan at or under $1,375,000? | Yes |
Scenario D: $1.5M project on land you own free and clear
| Step | Item | Amount |
|---|---|---|
| 1 | Land value used by the lender | $350,000 |
| 2 | Construction and soft costs | $1,150,000 |
| 3 | Total project value or cost | $1,500,000 |
| 4 | Loan needed for construction only | $1,150,000 |
| 5 | Loan share (4 ÷ 3) | About 76.7% |
| 6 | Check: loan at or under $1,375,000? | Yes, with $225,000 of room |
What if the lender would go higher? Even if a program allowed a larger share, the loan in these examples still stops at $1.375M. The remaining $125K or more has to come from land equity, cash or a smaller budget. Our $1.5M luxury custom home scenario and the jumbo construction mortgage guide cover how larger budgets are underwritten.
Is a $1.5M construction loan a jumbo loan?
Usually, yes. A loan is jumbo when it is above the conforming loan limit for the county where you build (FHFA, 2026 limits), and most counties have limits well below the loan amounts in Scenarios C and D.
As of November 2026, the Federal Housing Finance Agency's announcement of the 2026 conforming loan limits says: "In most of the United States, the 2026 CLL value for one-unit properties will be $832,750, an increase of $26,250 from 2025." The ceiling in high-cost areas is $1,249,125 for one-unit homes. FHFA's conforming loan limit page states: "Loans above this amount are known as jumbo loans." FHFA usually announces the next year's limits in late November, so check the current figure for your county before you plan.
Jumbo status changes the review, not the basic process. Expect closer looks at reserves, income documentation and the appraisal.
What are the steps from land to the permanent mortgage?
A custom home loan moves through eight stages: budget, land, builder and plans, application, appraisal and approval, closing, the build with draws, and conversion. Most delays come from missing documents in stages three and five.
1. How do you set a realistic budget?
Start with total cost, not house price. Add land, the builder's estimate, site work, soft costs, a contingency and closing costs. Then decide how much cash or land equity you will contribute and how much savings you will keep after closing. The construction loan calculator and build vs. buy calculator help test the numbers.
2. Should you buy the land first or finance it with the build?
Either can work. If you buy the land first with cash or a land loan, you can later fold that payoff into the construction loan. If you have not bought it yet, some programs finance land and construction together. Read land and construction loans and, if you already own land, the guide to construction loans on land you own.
Before you buy, check the site: survey, zoning, setbacks, flood zone, utilities and, outside town, water and septic. Our rural and acreage construction loan guide covers those checks in depth.
3. What do you need from your builder and plans?
Lenders want a licensed builder your lender approves, a signed contract, complete plans and specifications, and a line-item budget. Many lenders review the builder's license, insurance, references and financial standing. See how to finance a custom home with a builder and the construction loan scope of work article.
4. What happens when you apply?
You submit your financial documents along with the project package. Within three business days of an application, you should receive a Loan Estimate. The Consumer Financial Protection Bureau's Loan Estimate explainer says: "The lender must provide you a Loan Estimate within three business days of receiving your application." It also notes: "When you receive a Loan Estimate, the lender has not yet approved or denied your loan application." Have the construction loan documents checklist ready before you apply.
5. How does the appraisal work on a home that isn't built yet?
The appraiser estimates the home's value "as completed" using your plans, specifications, the lot and sales of similar homes. Fannie Mae's single-closing rules add a timing point: "For all single-closing transactions, the effective date of the appraisal must be no more than four months prior to the note date (that is, the closing date of the construction loan)." See our construction loan appraisal guide.
6. What happens at closing?
At closing you sign the construction loan, pay closing costs and any required cash, and the lender records its lien on the land. In a one-time close, you also sign the permanent loan terms now. Our closing costs guide explains the line items. Don't start work before closing unless the lender approves it; read starting construction before the loan closes to see why.
7. How are draws paid during the build?
The lender pays the builder in stages after inspections confirm the work. Fannie Mae's rules say: "When a single-closing transaction is used, the lender will be responsible for managing the disbursement of the loan proceeds to the builder, contractor, or other authorized suppliers." Most borrowers' payments during construction cover interest on the amount drawn so far. See how construction loan draws work, the draw schedule calculator and payments during construction.
8. How does the loan convert to a permanent mortgage?
When the home is finished and passes final inspection, a one-time-close loan converts to its permanent terms. A two-time-close loan is paid off by a new mortgage. Read construction loan conversion to a finished home for the final steps.
How long does a custom home take to build?
Plan on most of a year. As of the Census Bureau's 2025 annual data, published July 1, 2026, contractor-built single-family homes averaged 10.5 months from start to completion, compared with 6.1 months for homes built for sale (Census average start-to-completion table).
That figure starts when work begins, not when you start shopping for a lender. Add time for land, design, permits and loan approval. Loan programs also set limits on the build period. For single-close loans Fannie Mae says: "The construction loan period for single-closing construction-to-permanent transactions may have no single period of more than 12 months and the total period may not exceed 18 months." Lender programs vary, so ask each one how long its construction phase runs and what an extension costs. Our construction loan timeline and how long it takes to build a house calculator help you plan.
What does a custom home cost to build?
It varies widely by region, size and finish level. As a reference point, as of the Census Bureau's 2025 annual data, the median contract price of contractor-built single-family homes started in 2025 was $404,000, not counting the land (Census contract price table).
That is a national median, not a price for your home. The National Association of Home Builders' Cost of Constructing a Home 2024 study found that, on average in its 2024 survey of homes built for sale, 64.4% of the sales price of a new home was construction cost. Your own builder bid and appraisal are what matter for your loan.
What are the most common custom home borrower situations?
The five situations we see most are inherited or free-and-clear land, large builder deposits, self-employed income, second homes and large land equity. Each changes the file in a predictable way.
| Situation | What usually helps | Read next |
|---|---|---|
| Inherited land | A recorded deed in your name and estate records | Build on inherited land |
| Land owned free and clear | A current appraisal and clear title | Free-and-clear land |
| Big builder deposit already paid | Receipts and a contract showing the deposit | Builder deposits |
| Self-employed | Two years of returns and a clear income history | Self-employed construction loans |
| Second home | Larger reserves and a second-home program | Second-home construction loans |
| Large land equity | A plan for how the equity is credited | Land equity loans |
| Still paying off the land | A payoff letter for the land loan | Land still being paid off |
| Selling your current home | A plan for two housing payments | Build before selling |
What if you already paid the builder a large deposit?
A builder deposit you paid from your own documented funds can often count toward your contribution. Keep the signed contract, the receipt and bank statements that show where the money came from. Some lenders reimburse part of it at closing; others simply credit it. Ask before you pay more.
What if you are self-employed?
Lenders usually average your income from tax returns, so write-offs that lower taxable income also lower qualifying income. Start the conversation early and bring business returns, a year-to-date profit and loss statement, and bank statements.
What usually goes wrong, and how do you avoid it?
The most common problems are a low appraisal, cost overruns, a builder the lender won't approve and a construction period that runs long. Each one is easier to manage when you plan for it before closing.
- Low appraisal. If the "as completed" value comes in under cost, the loan shrinks and you cover the gap. See what to do when the appraisal is low.
- Cost overruns. Change orders and allowance overages usually come out of your pocket. Fannie Mae allows loan increases only in narrow cases: "Increases to the loan amount are permitted only as necessary to cover documented increased costs of construction of the property." Read construction loan cost overruns.
- Builder not approved. Find out early. See construction loan builder approval and changing builders mid-loan.
- Delays. Weather, inspections and backordered materials add months. Ask what an extension costs.
- Rate changes. Ask each lender how and when it locks the permanent rate. The CFPB's rate lock explainer notes: "Rate lock policies vary by lender."
How do you choose a construction lender?
Choose on the whole package: loan structure, how draws and inspections work, builder requirements, construction-phase length and the permanent terms, not just the advertised rate. Compare official Loan Estimates from more than one lender.
Questions worth asking every lender:
- Do you offer one-time close, two-time close or both?
- How do you credit land I already own?
- What builder documents do you require, and how long does approval take?
- How many draws, who inspects, and how fast are draws funded?
- How long is the construction phase, and what does an extension cost?
- When and how is the permanent rate locked?
Our article on how to choose a construction lender and the lender list can help you narrow the field. If you'd like help, get connected with a lender: tell us about your land, budget and builder, and we'll connect you with lenders who finance custom homes.
What happens after you submit a request?
Your request goes to My Construction Path, not directly to a lender. A member of our team reviews it and connects you with a lender. If you picked a lender, we note it as your preference. Always compare offers and ask each lender for an official Loan Estimate.
Frequently asked questions
Can I get one loan for the land and the house?
Often, yes. Many construction-to-permanent programs can finance the lot purchase and the build together, or pay off a land loan you already have, as part of one closing.
How much do I need down to build a custom home?
It depends on the program, the lender and whether you own the land. Your contribution is measured against total project cost, and land equity often counts toward it. Closing costs and reserves are usually extra.
Can I use land I already own as my down payment?
Usually, yes. Many lenders credit the equity in a lot you own toward the required contribution, sometimes covering all of it.
Do I pay a mortgage payment while the house is being built?
Usually your payments cover interest on the money drawn so far. Full principal and interest payments generally start after the loan converts to the permanent mortgage.
Does the lender have to approve my builder?
Yes, in most cases. Lenders typically review the builder's license, insurance, experience and references, along with the contract and plans.
What happens if the home appraises below the cost to build?
The lender usually bases the loan on the lower appraised value, so you may need to bring more cash, cut scope or use more land equity.
How long does a construction loan last?
The construction phase usually lasts about as long as the build, often under a year to a year and a half, before the loan converts or is refinanced. Each lender sets its own limits.
Sources
- Fannie Mae Selling Guide B5-3.1-02, single-closing construction-to-permanent transactions
- Fannie Mae Selling Guide B5-3.1-03, two-closing transactions
- 12 CFR 1026.17, Regulation Z
- FHFA, 2026 conforming loan limits and conforming loan limit data
- CFPB, What is a Loan Estimate? and What's a rate lock?
- U.S. Census Bureau, Survey of Construction definitions, Characteristics of New Housing highlights, contract price table and start-to-completion table
- NAHB, Cost of Constructing a Home 2024
Rates, down payments, credit scores, loan-to-value limits and other terms shown here are examples for general information only. They aren't an offer of credit or a commitment to lend. Actual terms vary by lender, borrower and property, change often, and are subject to credit approval. Ask each lender for an official Loan Estimate before you decide.
My Construction Path is not a lender and does not make loans or credit decisions. Not all borrowers will qualify. Equal Housing Opportunity. Requirements vary by lender, loan program, and location. This article is for general education and is not a commitment to lend. It is not a quote of rates, payments, or loan terms.