Underwrite the Build and the Borrower: From Purpose to Perm

One Question Routes the Entire File

Residential construction lending asks what commercial never does: is this loan consumer or business purpose? The answer sets the compliance regime, the underwriting basis, and, for a credit union, the classification. Get it wrong and the file is mis-underwritten and out of compliance at once.

The "second home" that is materially a short-term rental, the owner-builder, the spec called a custom home: each routes differently, and the determination has to survive examination. Course one settles purpose before anything else, because everything downstream depends on it.

Underwriting Revenue That Does Not Exist Yet

Short-term-rental construction adds a risk commercial credit rarely faces. The revenue is projected rather than in place, it is seasonal, and it can be erased overnight by a licensing moratorium or a zoning cap. The ordinance is a screening fact, not a footnote.

Underwriting it means haircutting occupancy and rate, loading the full expense stack, testing a long-term-rental fallback, and reading the ordinance before the cash flow. A projection that survives only under the current licensing regime is not a projection a bank can lend against.

Three Ways the Loan Gets Repaid

Residential construction has no single takeout: the product sets the repayment event, and that sets every downstream test. A consumer converts to a permanent mortgage, a builder repays from the sale of the home, and an investor repays from rent.

The consumer file qualifies at the permanent payment, not the construction interest-only. The builder is a small operating company, and the spec or presold home is repaid from the sale. The investor file is repaid from rent, where STR revenue is haircut, expensed, and tested against a long-term-rental fallback.

Commercial Machinery, Residential Scale

The path applies the draw, inspection, and lien-waiver discipline of commercial construction at the scale of a single home or a two-cabin short-term rental, across six core courses plus a supplemental course on homebuilder and land development lending.

Five cases carry five theories: a consumer approval, an STR conditional, a decline, a workout, and a builder line. Institutions without builder-line exposure certify on the six-course core; the supplemental adds subdivision and production-builder lending.

The Learning Paths Behind This Paper