What Is a Construction-to-Permanent Loan?

A construction-to-permanent loan (C2P), also known as a single-close or one-time-close construction loan, is a unique financing product that combines two separate loan phases into a single mortgage. The first phase funds the construction of your new home. The second phase automatically converts to a standard amortizing mortgage once the construction is complete and the certificate of occupancy is issued. Unlike a traditional two-loan approach, you apply and close only once, saving thousands in duplicate closing costs and eliminating the risk of rate lock expiration.

The Two Phases Explained

Construction Phase: During the building period (typically 6 to 18 months), the lender releases funds in stages called draws. These draws are tied to specific construction milestones, such as foundation completion, framing, rough electrical and plumbing, and final finishes. During this phase, you pay interest only on the amount of money actually disbursed—not on the full loan commitment. This keeps your payments manageable during construction when you may also be paying rent elsewhere.

Permanent Phase: When the home is completed and passes all final inspections, the loan automatically rolls over into the permanent mortgage. The full loan amount becomes due, and your payments switch from interest-only to standard principal-and-interest amortizing payments. The permanent rate and term were locked at the original application, providing certainty throughout the entire process.

The Draw Schedule and Interest Calculation

The interest-only payment during construction fluctuates because it is based on the outstanding drawn balance, which increases with each draw. In the early months (when only the land and foundation draws have been made), your interest payment is relatively small. By the final months of construction (when most of the budget has been drawn), you are paying interest on nearly the full loan amount. This calculator uses an average of approximately 60% of the loan balance to estimate your typical monthly interest cost during construction—a useful approximation for planning purposes.

Key Advantages of the One-Time Close

The primary advantage is cost savings. A traditional approach requires two separate loans: a construction loan that is paid off at completion, and a new purchase mortgage for the completed home. Each loan has its own appraisal, title search, origination fees, and closing costs—duplicating expenses that can total $5,000 to $15,000. The C2P loan eliminates the second closing entirely.

Rate protection is the second major advantage. Standard construction loans carry variable rates tied to the prime rate. With a C2P loan, your permanent mortgage rate is locked at the original application. If rates rise by 1% or more during your 12-month construction period—a real possibility in volatile rate environments—you benefit significantly from your rate lock.

Who Should Use a C2P Loan?

Construction-to-permanent loans are ideal for borrowers who are building a custom home on land they already own or are purchasing simultaneously. They work best when you have a licensed general contractor, detailed construction plans, and a fixed-price contract. Lenders will review all three during underwriting. Owner-builder arrangements (where you act as your own contractor) are typically not eligible for C2P programs and require a separate specialized construction loan product.