A construction loan pays for a house in stages while it is being built, then converts or gets refinanced into a permanent mortgage once the certificate of occupancy lands. Homeowners who understand the mechanics ahead of time avoid the two most common mistakes: running out of money before the build finishes, and paying a high interest rate for months longer than necessary.
The loan amount starts with a realistic budget that accounts for everything from the construction tools list to final landscaping, because every dollar you borrow now becomes part of the mortgage you carry for decades. Owners who plan the refinance before the first draw keep the whole process on one timeline.
How Construction Loans Work: Draws, Interest, and Project Phases
A construction loan is a short-term, interest-only line of credit. The lender releases money in draws as work passes inspection, and you pay interest only on the amount drawn, not on the total approved. During the build you make monthly interest payments, then the principal converts to a mortgage at the end.
The construction project life cycle moves from design and permitting through foundation, framing, rough-in, and finishes, and each phase triggers an inspection before the next draw is released. Builders who sequence work correctly keep the draw schedule on track; owners who change plans mid-build eat into their contingency.
A Typical Draw Schedule
- Excavation, foundation, and slab: first draw, often 15 to 20 percent of the loan.
- Framing and roof: second draw, usually the largest single release.
- Rough electrical, plumbing, and HVAC: third draw.
- Drywall, insulation, and interior finish: fourth draw.
- Trim, cabinets, flooring, and fixtures: fifth draw.
- Final inspection and completion: final draw, held until the certificate of occupancy.
Interest-Only Payments During Construction
You pay interest only on the money actually drawn, at a rate that floats with an index plus a margin. On a $300,000 loan at 7 percent, a fully drawn balance costs about $1,750 a month in interest alone. Delays stretch the interest-only period, so a three-month overrun can add thousands before the mortgage even starts.
Lenders also hold a contingency reserve, usually 5 to 10 percent of the loan, until the final inspection. That money is not yours to spend early: it exists so a cost overrun does not stall the build or force a second, more expensive loan mid-project.
Refinancing Options and the Real Cost of Building Stress
When construction ends you have three paths: convert the construction loan directly to a permanent mortgage with the same lender, refinance with a new lender into a conventional, FHA, or VA loan, or extend the construction loan if you are not ready to close. Conversion is the cheapest because it skips a second set of closing costs; refinancing with a new lender usually gets a better rate when market rates have dropped or your credit improved during the build. On a $300,000 balance, each quarter point of rate difference is about $45 a month, or roughly $16,000 over a 30-year term, so the comparison is worth doing with real quotes.
Building is one of the most stressful financial events a household goes through, and the strain is documented: the construction industry has a suicide rate among construction workers well above the national average, and industry groups now run support programs. Owners pushing a tight budget feel a milder version of the same pressure, so build in a real contingency of 10 to 20 percent and ask your lender or a housing counselor for help the moment a draw comes up short.
Construction-to-Permanent vs. Standalone Loans
A construction-to-permanent loan wraps both phases into one closing with one set of fees, and the rate converts when construction completes. A standalone construction loan ends at completion and requires a separate mortgage application, a second appraisal, and a second closing. Single-close loans dominate owner-built homes; standalone loans suit custom projects where the final cost is uncertain.
Residential and Commercial Builds Follow Different Rules
The loan product depends on what you are building. Owner-occupied homes qualify for the most favorable rates, with down payments from 5 to 20 percent depending on the program. Investment properties and mixed-use buildings fall into a stricter bucket: lenders require larger down payments, charge higher rates, and underwrite against the property income rather than your salary.
Borrowers who build income property face a different process because commercial construction follows stricter codes, inspections, and lender requirements than a single-family home. A commercial appraiser values the finished building on income potential, so lenders watch the lease plan as closely as the floor plan.
| Factor | Owner-occupied home | Investment or commercial |
|---|---|---|
| Down payment | 5 to 20 percent | 20 to 30 percent |
| Typical credit score | 620 and up | 660 and up common |
| Interest rate | Lowest available | 0.5 to 1.5 points higher |
| Underwriting basis | Personal income and credit | Property income potential |
| Term at conversion | 15 to 30 years fixed | Shorter terms, balloon or periodic refinance |
Owner-builders can also run into stricter rules than a licensed contractor would face. Some lenders require a general contractor for the whole build, and all of them want to see that the person managing the project has completed a similar home before.
What Lenders Evaluate Before You Refinance
Refinancing a construction loan is a new underwriting event, and the lender rechecks everything. Credit score, debt-to-income ratio, the appraisal, and the equity in the finished house all decide your rate. Most conventional programs want a score of 620 or better and a debt-to-income ratio at or below 43 to 50 percent including the new mortgage.
The construction materials selection and the quality of finishes drive the appraisal value, so keep receipts, spec sheets, and the architect drawings ready for the appraiser. A house appraised below the total of loan plus your cash means you bring money to closing.
Expect a hard credit pull at application and again near closing. The construction loan itself shows up as a line of credit on your report, so keep the balance stable and pay every draw-related bill on time during the build; a late payment in month nine can cost you the best rate at month twelve.
Documentation Checklist
- Certificate of occupancy and final inspection sign-off.
- Appraisal ordered within 60 days of closing, which most lenders require.
- Builder contract and every change order.
- Draw history showing all funds accounted for.
- Receipts for materials and finishes.
- Warranty documents for roof, HVAC, and appliances.
Equity and Loan-to-Value Limits
You generally need equity of at least 20 percent in the finished home to refinance without mortgage insurance. If the appraisal comes in below the construction total, ask about an 80-10-10 structure or a second mortgage instead of paying the whole gap in cash.
Step-by-Step: Refinancing Your Construction Loan
Plan for a 30 to 60 day process. Closing costs typically run 2 to 5 percent of the loan, so a rate drop of less than half a point rarely justifies the expense on a small loan.
- Close out construction: final inspection, certificate of occupancy, and lien waivers signed by every subcontractor.
- Order the appraisal early, because it drives both the rate and the loan amount.
- Compare quotes from three or more lenders; compare APR, points, and fees, not just the headline rate.
- Lock the rate once you have a closing date; floating for a better number can backfire in a rising market.
- Submit the full file: tax returns, pay stubs, bank statements, and the construction draw ledger.
- Close, pay off the construction loan in full, and confirm the old lender releases the lien.
A rate lock typically lasts 30 to 60 days. If your closing slips past the lock, a float-down option lets you keep the original rate even when market rates rose in the meantime; ask for it in writing before you commit.
Timing the close with the last deliveries matters. If your build involves oversized components, equipment transport and material delivery schedules affect when you can finish and close out the loan, so schedule large deliveries before the closing date and let the final draw cover them.
Avoiding Double Payments
The construction loan and the mortgage overlap for exactly one month if you are not careful. Close the mortgage before the construction loan next interest payment date, or ask the new lender to fund the payoff directly at closing.
Planning Ahead: Rates, Terms, and Contingencies
The cheapest refinance is the one you plan before the first draw. Choose a construction-to-permanent loan with a locked conversion rate if you expect rates to rise, and keep the contingency line intact so you never need a cost-overrun loan at emergency rates.
Equipment and machinery deserve their own budget. If your site work depends on hydraulic equipment for heavy construction operations, keep those costs in a separate equipment line or rental budget, because mortgage lenders rarely finance tools and machinery.
Questions to Ask Before You Sign
- Does the conversion rate lock at application or at closing?
- Are there penalties for paying off the construction loan early?
- Does the lender require a minimum equity percentage at conversion?
- What happens if the appraisal comes in low?
- Who holds the final draw until the certificate of occupancy?