OTC construction loans: how they work and who they fit
October 27, 2026
Building a home means juggling a construction loan and a permanent mortgage, and that usually means two closings, two sets of fees, and two chances for something to go sideways. A one-time close construction loan rolls both into a single transaction. For many borrowers planning a build, that simplicity is the main draw. It is worth understanding how the structure works before you commit.
An OTC construction loan funds the building phase and then converts automatically into a permanent mortgage once the home is finished. You go through underwriting and closing one time, locking in your permanent loan terms at the start. During construction, you typically make interest-only payments on the amount drawn so far. Once the certificate of occupancy is issued, the loan converts and principal and interest payments begin on the full balance.
The biggest advantage is avoiding a second closing, which saves money on duplicate appraisal, title, and closing costs. It also reduces the risk that your financial picture changes between the build and the end loan, since you qualify once. The tradeoff is that you commit to a permanent rate and program before you know your final build costs or timeline. Lenders generally want a detailed construction budget, plans, and a builder with a solid track record before they will approve the deal.
If you are buying a lot and planning to build, this structure usually makes the most sense when your income and credit are stable and your plans are firm. Borrowers who expect their budget to shift, or who may want to change lenders at the end, should ask hard questions about flexibility and contingency reserves. I'd also encourage anyone comparing options to ask how draws are handled, how change orders get approved, and what happens if the build runs over schedule. Those details matter as much as the rate itself. Builders and lenders both need to be on the same page, and a good loan officer will coordinate with them early.
A one-time close construction loan can cut paperwork and closing costs for buyers building a home, provided the plans and budget are solid. Ask about draw schedules, contingency funds, and conversion terms before you sign.