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Custom Home Construction-to-Perm Loans: Rates & Lenders

Building a custom home is a dream for many, but financing that dream requires navigating a specialized corner of the mortgage industry. A standard mortgage won’t work when a house doesn’t exist yet. A construction to permanent loan for custom home buyers bridges this gap beautifully—it’s a single loan that funds the building phase and then converts into a permanent mortgage once the keys are in hand. This streamlined approach eliminates two separate closings, sets of fees, and underwriting hurdles. For anyone embarking on a ground-up custom build, understanding this product means the difference between a chaotic funding scramble and a smooth financial path from dirt to dinner table.

Lenders often call this a “one-time-close” or “single-close” construction loan. The concept is simple: you borrow money to pay your builder in stages, and when the house is complete, the loan transforms into a traditional 30-year or 15-year fixed-rate mortgage without a second approval. As a custom home builder client, you are navigating a more complex risk profile than a tract-home buyer, so you’ll face stricter qualifying standards, but the payoff is immense—total control over the design and a single mortgage note.

How a Construction-to-Permanent Loan Actually Works

A construction to permanent loan for custom home projects follows a three-phase lifecycle: pre-construction qualification, the draw schedule during building, and the permanent mortgage phase.

First, you’ll apply and get approved based on your financial health, the land (either owned outright or being purchased), and detailed building plans. The lender orders an “as-completed” appraisal—an expert estimate of what the finished custom home will be worth based on blueprints, specifications, and comparable sales. Loan amounts are typically capped at a percentage of that future value, or the total project cost, whichever is lower. Many lenders go up to 80% of the as-completed value, meaning you’ll need significant cash equity in the land or a large down payment.

Once the loan closes, the construction phase begins. Instead of receiving a lump sum, funds are dispersed according to a draw schedule tied to milestones: foundation pour, framing, rough-in inspections, drywall, and final completion. You’ll only pay interest on the amount drawn, not the full loan commitment. An inspector or title company representative will visit the site before releasing each draw, ensuring the work is completed.

After the builder finishes the home and a certificate of occupancy is issued, the loan automatically rolls into the permanent mortgage. You stop making interest-only payments and start making principal-plus-interest payments based on the terms you locked at the beginning. There’s no second closing, no new appraisal, and no requalification. This continuity is the product’s killer feature for a custom home project.

Why the One-Time-Close Structure Beats Two Loans

Traditional construction financing requires a short-term, interest-only construction loan from a bank, then a separate mortgage from a different lender to pay off that construction debt. That process means:

• Two sets of closing costs (often $3,000 to $5,000 each)
• Two sets of underwriting, with the risk that your financial profile changes mid-build and you can’t qualify for the permanent mortgage
• Double the paperwork and time
• Potential interest rate risk if rates rise during construction and your permanent loan rate isn’t locked

A single-close product eliminates all of that. You’ll lock your permanent rate before the first shovel hits the ground. For a custom home that may take 12 to 18 months to complete, that rate protection is invaluable.

Qualifying for a Custom Home Construction-to-Permanent Loan

Lenders scrutinize custom builds more intensely than spec homes. Because there’s no standing home as collateral until the project is finished, you’ll need a stronger financial profile. Typical requirements include:

• Credit score: Minimum 680 to 700, with top rates available above 740. Some portfolio lenders may dip lower, but 700 is a practical floor.
• Down payment or land equity: Most lenders require 20% to 30% of the total project cost as a down payment. If you own the land free and clear, its appraised value counts toward that equity.
• Debt-to-income ratio (DTI): Generally capped at 43% to 45%, calculated on the eventual permanent payment. Because you’ll pay only interest during construction, the lender tests whether you can handle the fully amortized payment later.
• Detailed plans and specs: A signed builder contract, a line-item budget, architectural drawings, and a construction timeline. The builder must be licensed and insured, and their credit and background may be reviewed.
• Cash reserves: Many lenders want six to twelve months of mortgage payments (principal, interest, taxes, insurance) in liquid savings after closing, serving as a cushion for cost overruns or delays.

For a custom home, the lender’s comfort is everything. If you’re self-building as an owner-builder, you’ll find the hurdle much higher. Few banks will lend to an owner-builder because of the risk of mismanagement. If you must be the general contractor, expect to put down 30% or more and show substantial construction experience.

Interest Rates and Fees on Construction-to-Perm Loans

Rates on a construction to permanent loan for custom home builds run slightly higher than a vanilla purchase mortgage. You’re compensating the lender for taking on the risk that the home isn’t completed, costs spiral, or value doesn’t materialize. As of mid-2025, with a conventional 30-year fixed mortgage hovering around 6.5% for top-tier borrowers, expect construction-to-perm rates to start at 6.75% to 7.5%, depending on loan amount, credit, and down payment.

The rate you lock in during the application stage is typically the permanent mortgage rate. During the construction phase, you’ll pay interest-only on the outstanding draws at that same rate (or a slight construction-period premium). Once the house is complete, the loan seamlessly converts to the permanent rate. Some lenders offer a float-down option: if market rates drop by a certain margin before the permanent phase kicks in, you can adjust downward for a fee.

Fees are another point of comparison. A construction-to-perm loan involves:

• Origination fee: Often 1% of the loan amount, though some portfolio lenders charge 1.5% to 2% due to the labor-intensive administration.
• Closing costs: Title insurance, attorney fees, appraisal, survey, and recording fees. Total costs may run 2% to 5% of the loan amount.
• Draw inspection fees: Typically $200 to $400 per inspection. With five or six draws, that’s a modest addition.
• Interest reserve: Some lenders require you to pre-fund an interest reserve account that covers the interest payments during construction, ensuring you never miss a payment to the bank while the house is in progress. This is not a fee but a cash outlay that reduces your available down payment.

When comparing lenders, ask for a Loan Estimate that breaks down all these items. Don’t fixate solely on the interest rate; a slightly higher rate with lower closing costs and a float-down may beat a bare-bones rate from a lender that dings you on every draw inspection.

Top Lenders for Custom Home Construction-to-Perm Financing

The lender landscape for this niche product splits into three groups: national mortgage banks, regional banks, and credit unions. A custom home builder client will find the best fit not in a mega-lender’s call center, but in an institution that understands local building dynamics.

1. TD Bank
TD Bank offers a one-time-close construction-to-permanent loan with a broad geographic footprint in the eastern U.S. They finance custom homes, require 20% down, and allow you to lock a rate for up to 12 months. Their construction phase includes interest-only payments, and they’re known for transparent fee structures.

2. U.S. Bank
U.S. Bank provides construction-to-permanent loans for primary residences. They’ll finance up to 80% of the as-completed appraised value with a minimum 700 credit score. Their process includes a dedicated construction lending team that handles draws and inspections, reducing confusion.

3. Flagstar Bank
Flagstar’s construction-to-perm product is popular among custom builders. They offer fixed-rate terms, interest-only draws, and a single closing. They’re flexible on property types and will work with complex custom designs as long as the builder is vetted.

4. Local and Regional Banks
Don’t overlook the community bank down the street. A regional bank might portfolio the loan (hold it on their books), meaning they can bend guidelines for a strong borrower. If you’re building a unique custom home on acreage, a local lender who knows the area’s property values can be a godsend. Their rates may be a quarter-point higher, but the service and underwriting flexibility often outweigh that.

5. Credit Unions
Navy Federal Credit Union and others offer construction-to-permanent loans to members. Navy Federal, for example, markets a no-down-payment option for qualified members, though it’s not universally available. Credit union rates and fees are often low, but the challenge is finding one that navigates custom home builds well.

When evaluating lenders, interview them as you would a builder. Ask: “How many custom construction-to-perm loans did you close last year?” “Who handles draw inspections—an in-house team or a third party?” “Can I lock the rate at application, and do you offer a float-down?” “What happens if my project runs 60 days over schedule?” The answers reveal whether they’re a true partner or just dabbling.

Step-by-Step: From Approval to Permanent Mortgage

Securing and using a construction to permanent loan for custom home involves more moving parts than a standard mortgage. Here’s a roadmap:

1. Prequalify and find your budget
   Share income, asset, and credit information with a couple of lenders. They’ll give you a ballpark budget. Use that to pick your land (or assess your land’s value) and start preliminary plans with an architect.

2. Finalize plans and select a builder
   Your architect and builder will need to produce a detailed cost breakdown—site work, foundation, framing, HVAC, plumbing, electrical, finishes, landscaping. Lenders require this “hard cost” budget plus an itemized contract. Contingency reserves of 5% to 10% are standard; the lender may require you to keep that cash on hand.

3. Apply and lock your rate
   Submit your application, pay for the appraisal, and lock the permanent rate. The appraisal will be “subject to plans and specs.” The underwriter will verify your income, assets, credit, builder credentials, and the project’s feasibility.

4. Close the loan and fund the initial draw
   At closing, you’ll sign one set of documents. The lender sets up a draw escrow account. The first draw (often 10% to 20% of the loan) is released to pay for permits, site prep, and material deposits, less any initial down payment you must contribute. Most lenders require you to contribute your equity first before tapping the loan.

5. Manage draws during construction
   As the builder completes milestones, they submit draw requests. An inspector verifies the work, and funds are released. You’ll receive monthly interest statements. Keep the builder on schedule and communicate any change orders to the lender immediately—significant scope changes can unravel your loan compliance.

6. Final inspection and conversion
   When the custom home passes final inspection and receives a certificate of occupancy, the lender releases the final draw. You then transition to the permanent mortgage phase with your locked-in rate and begin making standard monthly payments. There’s no second closing, no fresh underwriting—just a seamless switch from construction interest to fully amortized principal and interest.

Frequently Asked Questions

What is a construction to permanent loan for a custom home?

It’s a single-close loan that finances the construction of your custom house and then automatically converts into a permanent mortgage once the build is complete. No separate construction and mortgage loans are needed.

What credit score do I need for a custom home construction-to-perm loan?

Most lenders require a minimum FICO score between 680 and 700 to qualify. For the best interest rates, aim for a score of 740 or higher.

How much down payment is required?

Typically, 20% to 30% of the total project cost (land plus construction). If you already own the land, its equity can reduce your cash outlay.

Can I build the home myself as an owner-builder?

It’s possible, but difficult. Few lenders accept owner-builder projects because of the higher risk. Expect larger down payments (30%+), proof of construction experience, and a very detailed plan.

How are funds released during construction?

Through a draw schedule. An inspector confirms completed work at each milestone (foundation, framing, etc.), and the lender disburses funds to your builder accordingly.

Does the interest rate change when the loan converts to permanent?

No—one major benefit is that you lock in a permanent rate at the start. You pay interest-only during construction on the amount drawn, then after conversion, you begin making full principal-and-interest payments at that same locked rate (unless you opted for a float-down clause).

Are construction-to-permanent loans more expensive than traditional mortgages?

The interest rate is usually 0.25% to 0.75% higher than a standard purchase mortgage, and closing costs can be slightly higher due to inspections and administration. However, the single-close structure saves you from paying two sets of closing costs and eliminates rate-market risk.