Most custom homes in Idaho are funded with a construction-to-permanent loan: a short-term loan that pays the builder in stages ("draws") as work is completed, then converts to a regular mortgage at move-in. Lenders typically expect around 20% down and want the land secured first. Rates and terms vary by lender and borrower.
Education, not a loan offer. Bolton Built is a builder, not a lender. This guide explains how construction financing generally works in Idaho so you can walk into a lender conversation informed. It isn't financial advice, and we don't quote rates — your terms come from a licensed local lender based on your situation.
Building isn't financed like buying an existing house — there's no finished home to mortgage yet, so the loan has to fund the home as it's built. Once you understand that one idea, the rest falls into place. Here's how it works in Idaho.
What a construction-to-permanent loan is
The most common way to fund a custom home is a construction-to-permanent loan, sometimes called a "one-time close." It does two jobs in one loan:
- During the build, it acts as a short-term construction loan, releasing money in stages as the home goes up. You generally pay interest only on what's been drawn so far.
- At completion, it converts into a standard long-term mortgage — no second closing, no second set of fees.
The alternative is a stand-alone construction loan that you refinance into a separate mortgage when the home is done. That means two closings and two sets of costs, but it can make sense in some situations. A local lender can tell you which fits you.
Down payment and the land-before-loan rule
Two things surprise a lot of first-time builders:
Expect a larger down payment
Because a home under construction is riskier collateral than a finished one, lenders commonly look for around 20% down on a construction loan. The exact number depends on the lender, your credit, and the loan program — treat 20% as a planning baseline, not a rule.
Land usually comes first
The lot is both the collateral and the basis for the appraisal, so the land generally needs to be secured before or as part of the loan. The good news: if you already own your land, that equity can count toward your down payment, sometimes substantially reducing the cash you need at closing.
How the draw schedule pays your builder
You won't hand the builder a lump sum. Instead, the lender releases funds through a draw schedule — money paid out in stages as defined milestones are finished and verified. A typical sequence looks like:
- Draw at foundation complete
- Draw at framing / dry-in complete
- Draw at mechanicals and rough-ins complete
- Draw at drywall / interior finish milestones
- Final draw at completion and final inspection
Before each draw is released, the lender usually confirms the work is done — often with an inspection or appraiser visit. It's a system that protects everyone: you and the lender only pay for finished, verified work, and the builder is paid fairly as the home progresses. It also lines up neatly with the phases of the build.
A typical path to financing your build
- Get pre-qualified with a local lender to learn your realistic budget.
- Secure your land (or plan to include it in the loan).
- Firm up plans and an itemized build cost — lenders lend against a real number, which is exactly the kind of estimate we provide.
- Apply for the construction-to-permanent loan; the lender appraises the finished-home value from your plans.
- Close once, build on the draw schedule, then the loan converts to your mortgage at move-in.
Knowing your cost and timeline makes every one of these conversations easier. When you're ready to put a real, lender-ready number to your project, request a consultation — or explore building a custom home with Bolton Built.
Frequently asked questions
What kind of loan do you use to build a custom home?
Most people use a construction-to-permanent loan — often called a "one-time close." It funds construction in stages while the home is built, then converts to a standard mortgage once you move in, so you only close once. Some borrowers instead use a stand-alone construction loan and refinance separately at completion.
How much down payment do you need for a construction loan in Idaho?
Lenders commonly look for around 20% down on a construction loan, though the exact figure depends on the lender, your credit, and the program. Land you already own can count toward that equity. Talk to a local lender for a figure specific to your situation.
Do I need to own the land before I get a construction loan?
Usually the land needs to be secured first — either already owned or purchased as part of the loan — because the lot serves as collateral and the site the appraisal is based on. Owning your land outright can also count as equity toward the down payment.
How does the builder get paid during construction?
Through a draw schedule. The lender releases funds in stages ("draws") as defined milestones are completed and inspected — for example after the foundation, framing, and mechanicals. This protects everyone: the builder is paid for finished work, and the lender confirms progress before releasing money.
Do I make payments while the house is being built?
Typically you make interest-only payments during construction, calculated on the amount drawn so far rather than the whole loan. Once the home is finished and the loan converts to a permanent mortgage, you begin regular principal-and-interest payments. Confirm the specifics with your lender.