Rate locks: what they are, how long they last, and where the risk hides

What a lock actually promises

Between application and closing, market pricing moves daily. A rate lock takes that risk off your shoulders for a defined window: the lender commits that the locked rate and points will carry through to closing. The CFPB's description captures both the promise and its conditions — the rate holds if you close within the period and nothing material changes on your application.

That second condition matters as much as the first. A lock freezes the price of a specific deal: your credit profile, the property, the appraised value, the loan amount, the program, the documented income. Change an ingredient — the appraisal comes in low, the loan amount shifts, a credit score drops before closing — and the lender can reprice to match the new deal. A lock is not immunity from your own file; it is immunity from the market.

Your lock terms appear on page 1 of the Loan Estimate: whether the rate is locked, and until what date and time. If that box says the rate is floating, you do not have a lock, no matter what was said on the phone. Ask for written lock confirmation the day you lock, and check three fields: the rate, the points at that rate, and the expiration date. A lock is a contract, and contracts are read, not assumed.

Note what a lock does not cover: it freezes the loan's pricing, not the transaction's other moving parts. Appraisal turn times, insurance placement, association approvals, and the other party's readiness all live outside the lock — which is why the lock decision is inseparable from the calendar management around it.

Lock periods, and pricing the calendar

Locks are sold in standard windows — commonly on the order of 30, 45, or 60 days, with longer locks available for new construction and slower transactions. Longer windows cost more, either in rate or in fees, because the lender is absorbing more market risk. That creates a genuine optimization: a lock longer than you need overpays for insurance, while a lock shorter than your real timeline sets up an extension fee later.

The right answer comes from the contract, not from optimism. Count from lock date to the closing date in your purchase contract, then add margin for the predictable frictions — appraisal scheduling, condo association documents, insurance placement. Florida transactions carry some distinctive timeline risks worth pricing in: condo and association document review, wind and flood insurance placement during storm season, and the possibility that a named storm pauses closings while insurers suspend binding new coverage. A lock that expires two days before a storm-delayed closing is an expensive lesson.

Extensions, expirations, and float-downs

If closing slips past the lock date, most lenders offer paid extensions in small increments, priced per day or per block of days. Who pays depends on why the delay happened and what was negotiated — sometimes the lender absorbs a delay it caused. If the lock fully expires, relocking generally happens at the worse of current pricing or your old pricing, which is exactly the outcome the lock existed to prevent.

A float-down is a separate feature some lenders offer, at a cost or by policy: if market pricing improves meaningfully after you lock, you can reset to a better rate once under defined conditions — typically requiring an improvement beyond some threshold. It is worth asking about before you lock, because it changes the psychology: with no float-down, locking is a one-way door, and borrowers sometimes float dangerously long waiting for a bottom no one can call. A lock is bought certainty. Treat the decision as budgeting, not market timing.

• Extensions: available but priced — small delays are affordable, expirations are not
• Expiration: relock risk at current market, potentially worse than your original terms
• Float-down: optional, lender-specific, usually conditional on a meaningful market improvement
• Change of circumstances: a lock does not survive material changes to the application

When to lock

There is no reliable way to time the market, so the defensible framework is personal: lock when you have a rate at which the deal works for your budget and an accurate view of your closing timeline. Locking early buys certainty for the entire escrow period; floating chases improvement while carrying the risk of the opposite. Borrowers who cannot afford the payment at a worse rate have no business floating — the downside is a deal that dies, and that asymmetry is the whole analysis.

Refinances deserve one extra note: with no purchase contract forcing a date, refinance timelines drift, and drifting is how refinance locks expire. Decide your acceptable pricing before you apply, lock when it appears, and then treat the closing like it has a contract deadline even though it does not. A refinance that saves money at the locked terms and then leaks it back through extension fees has defeated its own purpose.

Our role is the mechanics: as a broker, we arrange your loan and lock your rate with the wholesale lender you choose — we do not set the pricing behind the lock. What we control is matching the lock period to the real calendar, monitoring the expiration date, and raising extensions before they become emergencies. Rate locks fail far more often on logistics than on markets.