Construction-to-Permanent Loan: How It Works

A construction-to-permanent loan is a single mortgage that finances your home from the first day of construction through occupancy. Money is drawn in stages as the build progresses, then after completion, the loan automatically converts to a standard fixed-rate or adjustable mortgage—no second closing, no rate renegotiation. This structure simplifies borrowing but comes with conditions: the lender will inspect work at each stage, and you pay interest only on funds drawn, not on the full loan balance during construction.

Single close vs. traditional construction financing

Homebuilders typically use traditional construction loans: a short-term, interest-only line of credit that finances the build. Once the house is finished, the builder (or buyer) obtains a separate permanent mortgage and uses the proceeds to repay the construction lender. This two-loan approach requires two closings, two sets of lender fees, and the buyer often faces rate uncertainty between when the construction loan closes and when the permanent mortgage is locked.

A construction-to-permanent loan consolidates both steps. You close once; the lender advances money as work is completed; and when the house is done, the loan terms automatically shift to a fixed-rate mortgage. You avoid a second closing, lock your permanent rate at origination, and potentially save on fees.

The construction phase: Draw mechanics

During construction, the lender does not hand over the entire loan balance upfront. Instead, the loan is drawn in stages, typically coinciding with major construction milestones:

1. Lot acquisition or down payment (often 5–10% of the total loan)
2. Foundation and framing
3. Roof installation
4. Exterior closure (windows, siding)
5. Rough plumbing, electrical, and HVAC
6. Drywall and insulation
7. Interior finishes (flooring, cabinetry)
8. Landscaping and final details
9. Occupancy and conversion

The exact milestones vary by lender and builder. Before releasing each draw, the lender sends an inspector to verify that work has been completed to specification and that the funds from the previous draw were spent as intended. No inspection sign-off, no new money.

This staggered release protects the lender. If the builder stops working or goes bankrupt mid-project, the lender is not exposed to the full loan balance and can move to foreclose before too much capital has been deployed. For the homeowner, it means construction typically cannot resume after the lender withholds a draw—unless you inject personal funds.

Interest calculations during construction

Interest on a construction-to-permanent loan is charged only on the drawn balance during the construction phase:

Interest-only draw: If you have drawn $200,000 and the interest rate is 7%, you pay interest only on $200,000 for that month, not on the full $400,000 loan commitment. This approach minimizes borrowing costs during construction.

Capitalized interest: Some lenders allow you to capitalize unpaid interest—adding it to the principal balance instead of paying it out of pocket. This can ease cash flow during construction but increases the amount you owe when conversion occurs. Capitalized interest also accrues interest itself, making total borrowing costs higher.

Conversion interest: Once the loan converts to permanent, the full outstanding balance (including any capitalized interest) becomes subject to the permanent loan rate and term.

Rate and term structure

The construction phase typically has a variable or floating rate—indexed to SOFR (Secured Overnight Financing Rate) or the prime rate, plus the lender’s margin. Rates can change monthly as the index moves. This exposure is why many borrowers buy a rate lock or cap during construction.

At conversion, the rate shifts to whatever permanent term you chose: 15-year, 20-year, or 30-year, usually fixed. The permanent rate is set at origination (when you close the construction-to-permanent loan), not when construction finishes, so rate risk is eliminated. You know your permanent payment from day one.

Comparing construction-to-permanent to alternatives

Construction-to-permanent vs. traditional construction loan + permanent mortgage:

• Closing costs: One close saves fees; traditional requires two closings and two appraisals.
• Rate certainty: Construction-to-permanent locks the permanent rate at origination. Traditional requires a new rate quote after construction, exposing you to rate movement.
• Processing time: One application simplifies underwriting, though some lenders take as long anyway.
• Builder flexibility: Builders may resist construction-to-permanent because they have less control over the permanent lender. Traditional loans give them more flexibility to shop permanent lenders later.

Construction-to-permanent vs. home equity line of credit (HELOC): Some homeowners with equity in an existing home use a HELOC to finance construction instead. HELOCs are simpler and faster but carry variable rates and do not lock a permanent rate. They are practical only if you have sufficient equity and can absorb rate risk.

Qualification and documentation

Qualifying for a construction-to-permanent loan is more stringent than a standard mortgage:

• Debt-to-income ratio: Lenders typically require ratios below 43%, sometimes lower.
• Credit score: Expect 700+ for most competitive rates.
• Down payment: 10–20% is typical; some construction-to-permanent programs require 15–20%.
• Builder and contractor approval: The lender will vet the builder’s financial stability, track record, and quality standards.
• Detailed plans and cost estimates: The lender needs full architectural and engineering documentation, a detailed budget, and a realistic timeline. Any changes require lender approval and may affect the loan amount.

The application also includes a personal financial statement and proof of savings or liquidity—lenders want evidence that you can cover cost overruns or interest accrual if needed.

Common costs and considerations

Loan origination fee: 0.75–2% of the total loan amount.

Appraisal: Full appraisal upfront and a final appraisal at conversion (though some lenders waive the final appraisal if the property matches plans).

Inspection fees: Lender inspections are often bundled into the loan or charged per draw (typically $100–$300 per draw).

Interest accrual: If interest is not paid monthly, capitalized interest can add substantially to your loan balance. A $400,000 construction loan at 7% over 12 months of construction can accrue $28,000 in interest if you capitalize.

Timeline slippage: If construction delays push occupancy past the original estimate, interest accrual extends, increasing costs.

Overages: If construction costs exceed the loan amount, you must cover the difference from personal funds; the lender will not increase the loan.

Conversion and beyond

When the house is finished and inspection-ready, the lender issues a final draw. The loan then converts: the construction account closes, and a new permanent mortgage account opens at the permanent rate and term. You now have a standard mortgage—the draw schedule ends, and you make monthly principal-and-interest payments like any other homeowner.

Some lenders allow a brief grace period between final draw and conversion, but generally, conversion is automatic within 30–60 days of completion. You should not have to refinance or reapply.

When construction-to-permanent makes sense

Construction-to-permanent loans are most practical if:

• You are building a custom home with a proven builder
• You want to lock your permanent rate at origination and avoid rate risk
• You can qualify (good credit, acceptable debt-to-income, sufficient down payment)
• You have a realistic timeline and detailed cost estimates
• You can absorb cost overruns or interest accrual

They are less practical if:

• You are buying a home with a builder who prefers traditional construction loans
• Your timeline or costs are highly uncertain
• You have marginal credit or income
• You want maximum flexibility to walk away or modify plans

See also