Construction Loan Payment Calculator | TheUSCalculator.com
🏗️

Construction Loan Payment Calculator

Calculate monthly construction loan payments including interest-only payments during the build phase. Estimate total financing costs for new home construction.

✓ Free ✓ No Sign-up ✓ Instant Results ✓ Amortization Schedule

🏗️ Construction Loan Payment Calculator

Free · Instant · No registration required

Loan Amount $400,000
$
Annual Interest Rate (APR) 9.5%
%
Loan Term 12 months
Loan Drawn (% of Total) 50%
%
Term Unit
Monthly Payment
$0.00
per month
Principal
—
Total Interest
—
Total Cost
—
Payoff Date
—
Current Interest-Only Payment (on drawn amount)
—
Max Payment (100% drawn)
—

⚠️ This calculator provides estimates for educational purposes only. Actual loan payments may vary based on your lender's specific terms, fees, and your credit profile. Consult a licensed financial advisor before making major financial decisions.

About This Construction Loan Payment Calculator

A construction loan is a short-term loan that finances the building of a new home or major renovation. Unlike traditional mortgages, construction loans typically only charge interest on the amount drawn (disbursed) at any given time — as each phase of construction is completed, more funds are released and your interest payment grows.

Construction loan rates in 2025 are typically 1–2 percentage points higher than permanent mortgage rates, reflecting the additional risk to lenders during the build phase. Most construction loans have a term of 6–18 months, after which the home is complete and you either pay off the loan or convert it to a permanent mortgage.

Typical Rate vs. Mortgage1–2% higher
Construction Phase Term6–18 months typically
Payment During BuildInterest-only on amount drawn
Down Payment Required20–25% of project cost
Funds Released InStages (draws) as work completed
One-Time Close OptionConstruction-to-perm loan

How to Use This Calculator

1

Enter the total construction loan amount (total project cost minus your down payment).

2

Enter the construction loan rate — typically 1–2% above current permanent mortgage rates.

3

Adjust the % drawn slider to see how your interest-only payment grows as more funds are disbursed.

4

The calculator shows your current interest payment and maximum payment when the loan is fully drawn.

How the Payment Formula Works

Our calculator uses the standard loan amortization formula used by all US banks, mortgage lenders, and credit unions:

// Standard Amortization Formula M = P × [ r(1+r)ⁿ ] / [ (1+r)ⁿ − 1 ]

// Variables: M = Monthly payment amount P = Principal (loan amount) r = Monthly interest rate (APR ÷ 12 ÷ 100) n = Total number of monthly payments (term in months)

Each payment covers two components: interest (charged on your remaining balance) and principal (which reduces your balance). In the early months, more of your payment goes toward interest. As your balance decreases, more goes toward principal — this is called front-loaded interest amortization.

How Construction Loans Work

Construction loans are short-term loans that fund the building of a new home or major renovation. Unlike a traditional mortgage, funds are disbursed in stages — called draws — as each phase of construction is completed and inspected. You pay interest only on the amount drawn down, not the full loan balance, which helps manage cash flow during the build.

Most construction loans have terms of 12 to 18 months, matching a typical home-building timeline. At completion, you either refinance into a permanent mortgage — called a construction-to-permanent or one-time-close loan — or pay off the construction loan with a separate mortgage. One-time-close loans save you from paying two sets of closing costs.

Rates on construction loans are typically 1 to 2 percent higher than conventional mortgages because lenders take on more risk during the build phase. Your rate will depend heavily on your credit score, down payment, and the builder you choose. A contingency reserve of 10 to 15 percent above your construction budget is standard since unexpected costs are common.

Once your home is complete, use our Home Equity Loan Calculator to explore how your new equity could be put to work. For buyers comparing government-backed options for new construction, our FHA Loan Calculator covers low-down-payment alternatives worth reviewing.

Frequently Asked Questions

Construction loans disburse funds in stages called 'draws' tied to construction milestones (foundation, framing, rough-in plumbing/electrical, insulation, drywall, finishes, completion). You or your builder submit a draw request with documentation of completed work. The lender may send an inspector to verify progress before releasing funds. You pay interest only on the cumulative drawn amount — not the full loan amount.
A construction-to-permanent loan (also called 'one-time close' or 'all-in-one') automatically converts to a permanent mortgage when construction is complete — requiring only one application, one appraisal, and one closing. This saves time, money (one set of closing costs), and the risk of not qualifying for the permanent loan when construction ends. Most major lenders offer this product.
Construction lenders typically require: a complete set of architectural plans and specifications, a detailed construction budget, a signed contract with a licensed builder, the builder's license and insurance certificates, the builder's financial references and resume, a land appraisal (if you own the lot) or purchase contract, and your financial documents (W-2s, tax returns, bank statements). A licensed general contractor — not owner-builder — is often required for the best terms.
Construction cost overruns are entirely your responsibility. Most lenders build a 5–10% contingency into the budget, but significant overruns require out-of-pocket funds from you. Having a contingency reserve in your personal savings is essential. Fixed-price contracts with your builder limit your overrun exposure, but change orders (modifications to the original plan) can add up quickly — be disciplined about scope changes.
Owner-builder loans allow you to act as your own general contractor instead of hiring one. These loans are harder to qualify for because lenders see them as higher risk — homeowners typically lack professional project management experience. Owner-builder loans usually require a larger down payment (25–30%), higher credit scores, and sometimes a track record of prior construction projects. Most borrowers find hiring a licensed GC is worth the cost.