Construction Finance

Construction Loan Calculator - Construction Loan Payment Calculator & Building Loan Calculator

Free construction loan calculator & building loan calculator. Calculate construction loan payments, interest during construction, and permanent loan conversion. Our calculator uses standard loan formulas to provide accurate analysis for construction financing decisions.

Last updated: October 19, 2025

Construction and permanent loan calculations
Interest-only payment analysis during construction
Project cost and financing recommendations

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Construction Loan Calculator
Calculate construction loan payments, interest, and permanent loan conversion

Total cost to build the structure

Optional: Down payment amount

Expected time to complete construction

Rate after construction converts to permanent mortgage

Construction Loan Results

Total Project Cost

$250,000

Land + Construction

Construction Loan

$250,000

Construction Interest

$9,375

Monthly Payment (Construction)

$781.25

Interest-only

Permanent Loan Payment

$1,639.43

After construction

Permanent Loan Amount

$259,375

Total Interest Paid

$340,194

Construction Loan Analysis

  • Construction loans typically require interest-only payments during construction, converting to permanent mortgage upon completion.

Construction Loan Facts:

  • • Construction loans are interest-only during construction phase
  • • Interest accrues on drawn funds, not the full loan amount
  • • Loans typically convert to permanent mortgage upon completion
  • • Construction loans usually require 20-25% down payment or equity

Construction Loan Calculator Features

Construction Phase Payments
Calculate interest-only payments during construction

Payment Type

Interest-Only

Payments based on drawn funds during construction phase

Permanent Loan Conversion
Calculate permanent mortgage after construction completion

Conversion

Construction to Permanent

Automatic conversion to permanent mortgage upon completion

Project Cost Analysis
Calculate total project costs including land and construction

Total Cost

Land + Construction

Comprehensive project cost breakdown and financing analysis

Interest Calculation
Calculate interest accrued during construction period

Method

On Drawn Funds

Interest accrues on funds actually drawn, not full loan amount

Down Payment Options
Calculate loan amount with or without down payment

Equity

20-25% Typical

Option to include down payment in loan calculations

Financing Recommendations
Get personalized advice for construction financing

Guidance

Optimization Tips

Receive recommendations to optimize construction financing

Quick Example Result

For a $250,000 construction project with 12-month construction period:

Construction Loan

$250,000

Monthly Payment

~$780

Construction Interest

~$9,375

How Our Construction Loan Calculator Works

Our construction loan calculator uses standard loan formulas to calculate construction financing costs and payments. The calculation applies interest-only payment formulas during construction and permanent loan amortization formulas for post-construction payments.

Construction Loan Calculation Formulas

Total Project Cost = Land Cost + Construction CostConstruction Loan = Project Cost - Down PaymentConstruction Interest = Average Balance × Rate × MonthsMonthly Construction Payment = Average Balance × Monthly RatePermanent Loan = Construction Loan + Accrued Interest

These formulas provide accurate construction loan calculations. During construction, interest accrues on funds drawn (simplified as average balance). Upon completion, the construction loan plus interest converts to a permanent mortgage with standard amortization payments.

🏗️ Construction Loan Timeline

Shows construction phase interest-only payments and conversion to permanent mortgage

Understanding Construction Loans

Construction loans are specialized financing for building projects, different from traditional mortgages. They provide funds during construction and typically convert to permanent mortgages upon completion. Understanding construction loan mechanics helps plan financing, budget for interest costs, and make informed decisions about building projects.

  • Construction loans are interest-only during construction phase (no principal payments)
  • Funds are disbursed in draws as construction milestones are met
  • Interest accrues only on funds actually drawn, not the full loan amount
  • Construction-to-permanent loans automatically convert without refinancing
  • Typical down payment requirements: 20-25% of total project cost
  • Construction loan rates are typically 0.5-2% higher than traditional mortgages

Sources & References

  • Consumer Financial Protection Bureau (CFPB) - Construction Loan InformationGuidance on construction loans, financing options, and consumer protections
  • FDIC - Construction and Development LendingRegulatory information about construction loan requirements and practices
  • HUD - FHA Construction LoansFederal Housing Administration construction loan programs and guidelines

Need help with other construction or mortgage calculations? Check out our Mortgage Comparison Calculator and Borrowing Power Calculator.

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Construction Loan Calculator Examples

Construction Loan Calculator Example
Calculate construction loan for $250,000 project with 12-month construction period

Project Details:

  • Land Cost: $50,000
  • Construction Cost: $200,000
  • Total Project: $250,000
  • Construction Period: 12 months
  • Construction Rate: 7.5%
  • Permanent Rate: 6.5%

Calculation Steps:

  1. Construction Loan: $250,000 (project cost)
  2. Average Balance: $125,000 (simplified 50% of loan)
  3. Monthly Rate: 7.5% / 12 = 0.625%
  4. Monthly Payment: $125,000 × 0.625% = $781.25
  5. Construction Interest: $781.25 × 12 = $9,375
  6. Permanent Loan: $250,000 + $9,375 = $259,375

Result: $250,000 construction loan, $9,375 construction interest, $259,375 permanent loan amount

Monthly payment during construction: ~$781 (interest-only). Permanent loan payment calculated separately based on term.

With Down Payment Example

$250k project, $50k down payment

$200k construction loan, lower interest costs

Extended Construction Period

18-month construction timeline

Higher interest costs due to longer period

Frequently Asked Questions

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