A construction-to-permanent loan (often called a "CP loan" or "one-time close") is a single mortgage that pays for building your home and then automatically converts into a standard long-term mortgage once construction is finished. You qualify once, sign one set of closing documents, and pay one set of closing costs — instead of getting a construction loan now and a separate mortgage later.
How a construction-to-permanent loan works
A CP loan has two phases inside one mortgage. During the construction phase, the lender releases money to the builder in stages — called draws — as work is completed and verified. During this phase, you typically make interest-only payments, and only on the funds that have actually been drawn, not the full loan amount.
When the home is finished and passes its final inspection, the loan converts (or "modifies") into the permanent phase: a standard mortgage with regular principal-and-interest payments on the full balance. There is no second application, no second appraisal ordered from scratch, and no second closing day.
The draw-and-inspection rhythm is the engine of the construction phase. If you want the step-by-step mechanics, see our guide to construction loan draws and inspections.
One-time close vs. two-time close
The alternative to a CP loan is the "two-time close": a standalone construction loan first, then a completely separate permanent mortgage to pay it off when the home is done. Each structure has trade-offs.
- One-time close (CP): one approval, one closing, one set of closing costs. Your permanent financing is locked in before the first shovel hits dirt, which removes the risk of failing to qualify later.
- Two-time close: two approvals and two closings, but you can shop the permanent loan fresh at completion. The risk is that your income, credit, or the lending environment changes during the build — and you must re-qualify.
- Documentation differences: a two-time close means going through underwriting twice; a CP loan front-loads all of it.
Who actually needs a construction loan
Here is the distinction most buyers miss: if you are buying from a production builder that finances its own construction, you usually do not need a construction loan at all. The builder builds on its own line of credit, and you buy the finished home with a normal purchase mortgage that closes when the house is done.
A CP loan is for situations where you are the one paying for the build: custom homes on your own lot, owner-contracted builds, or builders that require buyer financing during construction. Understanding which path you are on is the first question to settle — our comparison of new build vs. existing home mortgages walks through both paths.
Qualifying: what lenders look at
Underwriting a CP loan covers everything a normal mortgage does — income, assets, credit, and debt — plus a construction layer. The lender also reviews the builder, the budget, and the plans, because the collateral does not exist yet.
- Builder approval: license, insurance, references, and financial standing. Lenders maintain approval processes for builders they have not worked with before.
- Plans and specifications: the appraiser values the home from the blueprints and feature list before it exists. See how the new construction appraisal process works from plans.
- Construction budget and contract: a fixed-price contract is easiest to underwrite; cost-plus contracts get extra scrutiny.
- Land: if you already own your lot, the equity in it can often work in your favor — covered in our guide to down payments on new construction.
- Reserves: lenders generally want cushion beyond the down payment, since builds can run over.
What happens during construction
Once you close, the loan enters the construction phase and the lender sets up a draw schedule tied to construction milestones — foundation, framing, mechanicals, drywall, and completion are typical checkpoints. Before each draw is released, an inspector confirms the work was actually done.
You will typically pay interest only on drawn funds during this phase, which means your payment starts small and grows as the house progresses. Budgeting for that ramp — while possibly still paying rent or a mortgage where you currently live — is one of the most important planning conversations to have before you start.
Converting to the permanent loan
Conversion is triggered by completion: a certificate of occupancy, a final inspection confirming the home matches the plans, and updated title work. The loan then modifies to its permanent terms and regular amortized payments begin.
Timing matters here because your permanent terms are usually locked before or during construction, and builds do not always finish on schedule. Extended locks and extension options exist specifically for this — our guide to rate lock timing for new construction explains how to manage it without naming a single number.
Common mistakes to avoid
The expensive mistakes on CP loans are almost always planning mistakes, not paperwork mistakes.
- Signing a builder contract before talking to a lender — contract terms drive what the loan can and cannot do.
- Underestimating change orders. Mid-build upgrades usually cannot be rolled into a loan that has already closed; they come out of pocket.
- Ignoring the interest ramp during construction while carrying current housing costs.
- Assuming the builder's in-house lender is the only option — see do you have to use the builder's preferred lender?
- Skipping the completion contingency conversation: know what happens to your terms if the build runs long.
Frequently Asked Questions
Is a construction-to-permanent loan harder to qualify for?
The borrower requirements are similar to a standard mortgage, but there is more to underwrite: the builder, the budget, the plans, and the land all get reviewed. Expect more documentation and a longer approval timeline, not necessarily tougher personal criteria.
Do I make payments while the home is being built?
Typically yes — interest-only payments on the amount drawn so far, not the full loan amount. The payment starts small and grows as construction draws are released, then converts to regular principal-and-interest payments at completion.
Can I use land I already own toward the loan?
Usually, yes. If you own your lot outright or have equity in it, that equity can often count toward your down payment requirement on a construction-to-permanent loan. The appraisal will value the completed home including the land.
What happens if construction takes longer than expected?
Construction loans have a defined build period, and lenders have extension processes if a build runs long. Delays can also affect your rate lock, which is why extended-lock options exist for new construction. Discuss the delay plan with your lender before closing, not after.
Is a construction-to-permanent loan the same as a builder's financing?
No. When a production builder finances construction itself, you simply buy the finished home with a standard purchase mortgage. A construction-to-permanent loan is for when you — not the builder — are funding the build, such as a custom home on your own lot.
Planning a new construction purchase?
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