Construction lending is fundamentally different from a standard mortgage. Here's everything you need to understand — from initial loan review through permanent conversion.
Most borrowers understand how a standard mortgage works. Construction lending has a different structure, different risk profile, and different documentation requirements. Here's the comparison.
| FEATURE | STANDARD MORTGAGE | CONSTRUCTION LOAN |
|---|---|---|
| Collateral | Existing home | Land + construction costs |
| Funding | Lump sum at closing | Down payment / equity + milestone draws |
| Payments during build | N/A | Interest-only on drawn funds |
| Appraisal basis | Current market value | "As-completed" value |
| Underwriting | Borrower only | Borrower + project + builder |
| Closing | One closing | One loan, two phases: temporary & permanent |
| Free Float Down | No | Yes |
| Timeline | 30–45 days to close | 30–45 days to close + 6 months plus build |
Funds are not released all at once. They're disbursed in stages tied to completed construction milestones — verified by an independent inspector. This protects you, your builder, and the lender.
Covers the cost of the lot, permit fees, and all pre-construction expenses. This draw is released the day the loan closes so your builder can mobilize immediately.
Draw Inspection Process: Before each draw is released, an independent inspector visits the site to verify the work is complete and meets the required standard. This typically takes 2 to 5 business days. Your builder should plan for this inspection window in their schedule.
Building a custom home in Idaho usually happens in two distinct phases: planning before closing and construction after closing. In many cases, pre-construction planning takes 2 to 4 months, followed by 8 to 12 months of construction, depending on the builder, permitting, design complexity, inspections, and weather.
Understanding that difference helps set realistic expectations around timing, draw activity, and when the home is expected to be complete.
Note: Every project is different, and timelines can vary based on permitting, builder scheduling, material availability, weather, and change orders. This overview is intended to provide a realistic framework for how a typical Idaho custom home progresses from planning to completion.
During the construction phase, you pay interest only on the funds that have actually been drawn, not on the full loan amount. That means if your total loan is $600,000 but only $200,000 has been disbursed, your interest payment is based on the $200,000 outstanding balance.
In the early stages of the project, the borrower's required funds are generally used first before construction loan proceeds are fully disbursed. This can help keep the outstanding loan balance lower at the beginning of the build. In some cases, the first draw at closing may be used to pay for the land. A limited draw at closing may also be allowed to prepay for materials and lock in pricing, although draws at closing are generally limited to 10% of the contract budget.
As construction moves forward and additional draws are released, the outstanding balance increases, and the monthly interest payment rises accordingly. By the end of the construction phase, interest is typically being paid on the full amount advanced.
Once construction is complete, the loan converts to the permanent mortgage, and the payment changes from interest-only to principal and interest based on the final loan terms.
Interest is charged only on funds disbursed — early payments are at their lowest.
Illustrative only. During construction, payments generally reflect interest on funds disbursed. After completion, the loan converts to permanent financing. Actual payments depend on final loan amount, note rate, term, escrow setup, and draw timing.
Our complete borrower guide covers builder activation, the draw process, progress inspections, cost overages, payments, the rate float-down, and loan conversion — everything you need to navigate a construction loan with confidence.
Now that you understand how construction lending works, let's apply it to your specific Idaho project. Reach out and we'll map out your loan structure, timeline, and draw schedule.