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Renovation Financing Cost Calculator

Reviewed by the CalculatorHub team, edited by James Graham. Standard loan amortization formulas. Based on IRS mortgage interest deduction rules and standard time-value-of-money calculations. Last verified 14 June 2026.

Financing a home renovation instead of paying cash increases the total cost of the project due to interest charges. The type of loan you choose, the interest rate, and the term all affect your monthly payment and total interest paid. This calculator uses the standard loan amortization formula to compute monthly payments and total interest for two financing scenarios side by side, so you can compare the true cost of different borrowing options before committing to a renovation project.

Total amount you plan to borrow for the renovation
Home equity loan rate (example); check current rates from your lender
Home equity loans: 5 to 15 years; personal loans: 2 to 7 years
Personal loan rate (example); typically higher than home equity rates
Shorter terms mean higher monthly payments but less total interest
$297.03
$556.11
$10,643.57
$8,366.42
$35,643.57
$33,366.42

Loan amortization formula

Monthly Rate (r) = Annual Rate / 12 / 100
Number of Payments (n) = Term in Years x 12
Monthly Payment (M) = P x r x (1+r)^n / ((1+r)^n - 1)
Total Cost = M x n
Total Interest = Total Cost - Loan Amount

This is the standard loan amortization formula used by all US lenders. Each monthly payment covers first the interest accrued that month (Principal x Monthly Rate), then the remainder reduces the principal balance. Early payments are mostly interest; later payments are mostly principal. This is the formula underlying Truth in Lending Act (Regulation Z) required disclosures on loan agreements.

Renovation loan options compared

  • Home equity loan: fixed rate, fixed payment, secured by home. Typically the lowest rate after mortgage refinancing. Interest may be tax-deductible if used for qualifying improvements (IRS Publication 936).
  • HELOC: variable rate tied to prime rate, flexible draw, interest-only option during draw period. Useful if renovation cost is uncertain. Rate risk: payments can rise if rates increase.
  • Personal loan: unsecured, no home equity required, higher rates than home equity products. Faster to close and no risk to home if you cannot repay. Best for small renovations ($5,000 to $25,000).
  • Cash-out refinance: replaces your existing mortgage with a larger one and gives you the difference in cash. Only makes sense if current rates are close to your existing rate; otherwise, refinancing to a higher rate increases mortgage cost significantly.
  • FHA 203(k) loan: HUD program that combines home purchase or refinance with renovation costs. Good for fixer-uppers. Requires HUD-approved consultant for standard version (projects over $35,000).

Renovation financing: frequently asked questions

What is the best way to finance a home renovation?

The best financing option depends on how much equity you have, the renovation cost, and your credit score. A home equity loan or HELOC typically offers the lowest interest rate (because the loan is secured by your home) and may offer tax-deductible interest if used for qualifying home improvements. A personal loan has no collateral risk but higher interest rates. Cash-out refinancing makes sense only if current mortgage rates are close to your existing rate.

Is home equity loan interest tax deductible?

Under the Tax Cuts and Jobs Act of 2017, home equity loan and HELOC interest is deductible only if the funds are used to 'buy, build, or substantially improve' the home that secures the loan. Interest used to pay off credit cards or personal expenses is not deductible. The deduction is subject to the overall mortgage interest deduction limits ($750,000 total debt for married filing jointly for loans taken after December 15, 2017).

What is a HELOC and how is it different from a home equity loan?

A Home Equity Line of Credit (HELOC) is a revolving credit line secured by your home equity, similar to a credit card. You draw what you need and pay interest only on the amount drawn. A home equity loan is a lump-sum loan with a fixed rate and fixed monthly payments. A HELOC typically has a variable rate (tied to the prime rate) and a draw period (typically 10 years) followed by a repayment period (typically 20 years).

What credit score do I need for a renovation loan?

For a home equity loan or HELOC, lenders typically require a minimum credit score of 620 to 680, plus sufficient home equity (typically 15% to 20% after the loan). For a personal renovation loan, minimum scores vary by lender from 580 to 680 depending on the rate offered. Higher credit scores qualify for lower interest rates that can save thousands over the loan term.

What is a 203k loan and when should I use it?

An FHA 203(k) loan (administered by HUD) combines the purchase or refinance of a home with the cost of renovations into a single mortgage. It is useful when buying a fixer-upper because you can finance both the purchase and renovation costs in one loan. The standard 203(k) requires renovations of at least $5,000 and allows structural changes; the limited 203(k) is for smaller projects under $35,000. A HUD-approved consultant is required for the standard version.

Official sources

Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.