Construction financing calculator • 2026 rates
\( M = P \times \frac{r}{1-(1+r)^{-n}} \)
Where:
Construction loans typically have 6-18 month terms during construction with interest-only payments, followed by permanent financing. This formula calculates the interest-only payments during the construction phase.
Example: For a loan of \( P = \$300{,}000 \) at an annual interest rate of 7.5% during 12-month construction:
Monthly interest rate: \( r = \frac{7.5\%}{12} = 0.00625 \)
During construction: \( \text{Monthly Payment} = P \times r = 300{,}000 \times 0.00625 = \$1{,}875 \)
After completion, the loan converts to a traditional mortgage with amortizing payments over the permanent term.
Thus, the borrower would pay approximately $1,875 per month during construction.
During construction, you'll make interest-only payments on the amount drawn. The total project cost is $300,000 with 12-month construction period. After completion, the loan converts to permanent financing with amortizing payments.
Estimated construction payment: $1,875/month
| Draw # | Phase | Amount | Cumulative | Interest |
|---|---|---|---|---|
| 1 | Foundation | $62,500 | $62,500 | $391 |
| 2 | Framing | $62,500 | $125,000 | $781 |
| 3 | MEP | $62,500 | $187,500 | $1,172 |
| 4 | Finish | $62,500 | $250,000 | $1,563 |
A construction loan is a short-term loan used to finance the construction of a residential or commercial building. The loan covers the cost of land purchase, materials, labor, and other construction-related expenses. Once construction is complete, the loan typically converts to a permanent mortgage.
During the construction phase, payments are typically interest-only on the amount drawn:
After construction, the loan converts to a traditional mortgage using the standard formula:
Where:
Construction loans differ from traditional mortgages in several key ways:
Short-term loan financing building construction with interest-only payments.
Construction: \( \text{Payment} = \text{Amount Drawn} \times \frac{\text{Rate}}{12} \)
Permanent: \(M = P\frac{r(1+r)^n}{(1+r)^n-1}\)
Coordinate funding releases with construction milestones.
Funds released in stages as construction milestones are completed and inspected.
During construction, pay only interest on the amount drawn, not the full loan amount.
Construction period typically 6-18 months, with extensions possible.
Construction-to-permanent loans automatically convert to traditional mortgages.
What is the primary difference between stand-alone construction loans and construction-to-permanent loans?
The answer is B) Stand-alone requires separate permanent financing. Stand-alone construction loans are short-term loans that must be refinanced into a permanent mortgage after construction. Construction-to-permanent loans combine both phases into a single loan agreement.
Understanding the loan structure is crucial for planning. With stand-alone loans, borrowers must secure permanent financing before or shortly after construction completion. With construction-to-permanent loans, the transition happens automatically under the same loan agreement.
Stand-Alone Construction Loan: Short-term loan requiring separate permanent financing
Construction-to-Permanent: Single loan covering both phases
Permanent Mortgage: Traditional long-term home loan
• Stand-alone loans require refinancing after construction
• Construction-to-permanent loans have single application
• Both have similar interest rates during construction
• Construction-to-permanent offers convenience and certainty
• Stand-alone may offer better rates for permanent financing
• Consider your credit profile for refinancing options
• Not planning for refinancing with stand-alone loans
• Assuming both loan types work identically
• Not understanding the conversion process
Calculate the monthly payment during construction for a $200,000 construction loan at 8% annual interest during a 12-month construction period. Show your work.
During construction, payments are typically interest-only on the amount drawn.
Monthly interest rate = 8% ÷ 12 = 0.08 ÷ 12 = 0.006667
Monthly payment = Principal × Monthly rate
Monthly payment = $200,000 × 0.006667 = $1,333.40
The monthly payment during construction would be approximately $1,333.40.
Construction loans typically require only interest payments during the construction period. This keeps monthly payments lower while construction is ongoing. The principal is repaid after the loan converts to permanent financing.
Interest-Only Payment: Payment covering only interest charges
Amount Drawn: Funds released for construction progress
Construction Period: Time between loan start and completion
• Construction payments are typically interest-only
• Payments based on amount currently drawn
• Principal repaid during permanent financing
• Payments increase as more funds are drawn
• Budget for higher payments after completion
• Consider timing of draws to manage payments
• Calculating full amortization during construction
• Not accounting for increasing payments as draws occur
• Assuming payments remain constant throughout
A $300,000 construction loan is structured with 6 draws. If the foundation draw is 15% of the construction cost, framing is 25%, mechanical/electrical/plumbing is 20%, roofing is 15%, and finish work is 25%, what is the amount of the framing draw?
Assuming the $300,000 is the total construction cost:
Framing draw = Construction cost × Framing percentage
Framing draw = $300,000 × 0.25 = $75,000
Therefore, the framing draw amount is $75,000.
Construction loans release funds in predetermined stages that correspond to construction milestones. The draw schedule ensures funds are used appropriately and provides lender protection by linking disbursements to verified progress.
Draw Schedule: Staged release of loan funds based on construction progress
Construction Milestone: Completed phase of construction
Progress Inspection: Verification of completed work
• Draws tied to verified construction progress
• Inspections required before fund release
• Percentage allocations predetermined in loan agreement
• Coordinate with contractor's schedule
• Plan for inspection timing
• Budget for draws in advance
• Not understanding the draw approval process
• Assuming all funds are available upfront
• Misaligning contractor payments with draws
A borrower is considering a $250,000 construction loan at 7.5% for 12 months during construction, followed by a 30-year permanent mortgage at 6.5%. What is the total interest cost during the construction period, and what would be the monthly payment after conversion to permanent financing?
Construction Period Interest:
Monthly interest = $250,000 × (0.075/12) = $250,000 × 0.00625 = $1,562.50
Total construction interest = $1,562.50 × 12 = $18,750
Permanent Financing Payment:
Using the standard mortgage formula: \(M = P\frac{r(1+r)^n}{(1+r)^n-1}\)
Where P = $250,000, r = 0.065/12 = 0.005417, n = 30×12 = 360
M = $250,000 × [0.005417(1.005417)^360]/[(1.005417)^360 - 1]
M = $250,000 × 0.00632 = $1,580.00
During construction: $18,750 in interest. After conversion: $1,580/month.
This example shows the two-phase nature of construction loans. During construction, interest-only payments are made on the full loan amount. After conversion, the loan becomes a traditional amortizing mortgage with both principal and interest payments.
Two-Phase Financing: Construction phase followed by permanent phase
Interest-Only Period: Payment covers only interest charges
Amortizing Payment: Payment includes principal and interest
• Construction phase has interest-only payments
• Permanent phase has amortizing payments
• Rates may differ between phases
• Budget for increased payments after conversion
• Compare construction and permanent rates
• Plan for transition timing
• Not planning for payment increase after conversion
• Assuming permanent financing rates will be better
• Not accounting for total interest costs
Which of the following is typically required for a construction loan application?
The answer is D) All of the above. Construction loans require extensive documentation including detailed architectural plans, a signed contract with a qualified contractor, and proof of builder's insurance to protect the lender's investment during construction.
Construction loans carry higher risk for lenders due to the temporary nature of the collateral (uncompleted structure). Therefore, lenders require comprehensive documentation to mitigate risk and ensure successful project completion.
Builder's Insurance: Insurance protecting the construction project
Architectural Plans: Detailed drawings of the planned structure
Contractor Agreement: Legal contract with construction professional
• Extensive documentation required for approval
• Plans must be detailed and complete
• Contractor must be licensed and qualified
• Prepare documentation early in process
• Verify contractor credentials
• Ensure plans meet local requirements
• Submitting incomplete plans
• Working with unqualified contractors
• Not meeting documentation requirements
Q: What's the difference between construction-to-permanent and stand-alone construction loans?
A: The key differences are:
For example, a $300,000 project with a construction-to-permanent loan would have one loan agreement. With a stand-alone loan, you'd need to secure separate permanent financing after construction, subject to market rates and your credit at that time.
Q: How do draw schedules work in construction loans?
A: Draw schedules release funds in predetermined stages as construction progresses:
Each draw requires an inspection to verify work completion before funds are released. This protects the lender by ensuring money is spent appropriately.