The quick answer

If construction will not finish before the rate-lock expiration, the lender must apply its written policy. Options may include extending the existing lock, relocking under current terms or using a previously agreed float-down feature. The cost and available choice depend on the lender, lock agreement, reason and length of delay, market movement and whether the loan changed.

What a rate lock does

The CFPB explains that a rate lock generally protects the rate between the offer and closing for a specified period, provided the loan closes in time and application details do not change. Page one of the Loan Estimate states whether the rate is locked and the expiration date and time.

A lock is not a promise that every loan term survives a change in credit, income, appraisal, loan amount or program.

Common responses to a delay

None should be assumed. Ask for the policy and cost before committing to the initial lock.

  • Paid extension for a defined number of days
  • Builder or lender contribution under an agreement
  • Relock using a current-policy formula
  • New lock at then-current market terms
  • Float-down if the original agreement provides it

Who pays for an extension

Responsibility may depend on the builder contract, lender policy, cause of delay and negotiated terms. A builder-caused delay does not automatically mean the builder will pay unless the obligation exists.

The loan officer can explain loan consequences; contract rights should be addressed with the Realtor or attorney.

Plan before locking

For a production home, coordinate with the site agent. For a custom build, monitor draws, inspections, certificate-of-occupancy timing and remaining conditions.

  • Use a realistic completion date with buffer.
  • Compare shorter and longer lock costs.
  • Ask how extensions are priced.
  • Ask whether unused days have value.
  • Understand float-down triggers and deadlines.
  • Keep the lender updated on construction milestones.

Example

A Jacksonville-area home expected to finish June 1 receives a lock through June 15. Weather and utility delays move closing to July 10. The borrower should not infer the result from market rates alone; the written extension or relock policy determines the available terms.

Borrower-specific advice requires the actual lock agreement, Loan Estimate and current loan details.