Every mortgage quote you receive before you lock is a weather report, not a price: rates move with the market, daily and sometimes faster, and the number a lender quoted on Monday is not owed to you on Friday. A rate lock is the moment the quote becomes a price — your lender’s written agreement to hold one interest rate, and the points attached to it, for a stated number of days while your application is processed. Everything on this page is the fine print that decides whether that price survives to your closing day.
The lock holds three things together: a rate, a price for that rate (stated in points — one point is 1% of the loan amount — or in lender credits), and a deadline. The Federal Reserve’s consumer guide puts it as a specified interest rate and a specified number of points for a stated period; the CFPB adds the conditions that give the definition its edge — the rate will not change between the offer and closing provided you close within the specified time frame and there are no changes to your application. A lock is therefore a conditional price agreement. It is not a loan commitment, not an approval, and not insurance that the loan closes: it removes market movement from your file while underwriting decides everything else. The full machinery of how your payment is built once the rate is set is in what is mortgage amortization.
Until you lock, you float, and floating is a position: you gain if rates fall before closing and you pay if they rise, with no cap in either direction. Some borrowers float deliberately for a few days after application while documents are verified, because a lock taken on an application that then changes materially can be repriced anyway. What floating should never be is accidental — a buyer three weeks into a contract who has never asked whether the rate is locked owns market risk they may not know they took. Ask the question in writing, and know that the answer is printed: page 1 of your Loan Estimate states whether the rate is locked, and if it is, Regulation Z (12 CFR 1026.37(a)(13)) requires the estimate to show the date and time, with time zone, when the lock period ends.
Lock periods are typically 30, 45 or 60 days, sometimes longer — and very long locks, for new construction measured in months, exist at higher cost. Price rises with length, because a longer lock is more rate risk carried by the lender, so the choice is not “as long as possible.” Count the days from today to your contract closing date, then add the cushion your file honestly needs: a clean purchase with a responsive seller may need a week; a file with a slow appraisal market, a sale contingency ahead of you, or a holiday in the middle needs more. Then compare that count with the lock on the Loan Estimate, not with what you remember being quoted. An expired lock is the expensive outcome this arithmetic exists to avoid — the CFPB warns plainly that an extension may be expensive, and the Federal Reserve notes that if the lock expires before settlement you may lose the locked rate and points altogether.
A lock freezes the market, not your file. If the application changes materially, the price can be re-cut: a loan amount that moves, a down payment that shrinks, a credit score or income figure that verifies differently, an appraised value that changes the loan-to-value, or a switch of loan product or term. None of that is lender misbehavior — the lock priced the loan described in the application, and a different loan is a different price. The working rules follow directly: no new debts, no large undocumented deposits, no job change without telling the lender first, and documents returned the day they are requested, because every slow week is spent from the same lock window. If rates fall after you lock, your rate normally stays where it locked; a float-down — the right to take a lower rate once, if the market drops — exists only if your lender offered it, usually for a fee or a worse starting price, and it is written in the lock terms or it does not exist.
No page can tell you whether to lock today. That judgment depends on your closing date, your file’s remaining risks, and a market nobody can forecast — anyone who promises you next month’s rates is selling something. What you can control completely is the part this page covers: knowing whether you are locked, until exactly when, at what rate and price, and what your file still owes the calendar. Those four facts are on your Loan Estimate and in your lender’s lock confirmation, in writing, today.
Homeowner HQ tracks the home half of a purchase — the value estimate refreshed monthly by your own agent and the facts behind it — which is why a buyer working toward a lock can walk in with the property’s record already straight: the same corrected facts an appraiser and an underwriter will test. The rate itself is your lender’s paper, and HQ never quotes one: when your file changes — a value that moves, a fact corrected — your agent has the current record in the same place your lender questions will land.
A mortgage rate lock is a lender’s agreement to hold a specific interest rate — and a specific number of points, the price of that rate — for a specific period of time while your loan application is processed. That is the Consumer Financial Protection Bureau’s and the Federal Reserve’s shared description, and both attach the same two conditions: you must close within the lock’s time frame, and your application must not materially change. Before you lock, nothing is held: a quoted rate floats with the market and can change daily, sometimes more often. After you lock, market movement stops being your problem inside the window — if rates rise, your locked rate stands; if rates fall, your locked rate also stands, unless your lock carries a float-down provision, which is an option some lenders sell, never a default. A lock is a price agreement, not an approval: it does not promise the loan will be made, and underwriting, appraisal and title work all still have to finish inside the same window.
Typically 30, 45 or 60 days, and sometimes longer — the CFPB’s stated range — with the Federal Reserve noting locks from as short as about a week to as long as 120 days across lenders. The right length is not the longest or the cheapest; it is the one that covers your real road to closing with a cushion: the days from lock to your contract closing date, plus room for the ordinary delays — an appraisal that comes back with questions, a document that has to be re-sent, a title issue that takes a week. Longer locks generally cost more, priced into the rate or the points, because the lender is carrying your rate risk for longer. Your lock is not a verbal assurance: it is printed on page 1 of your Loan Estimate, and if the rate is locked, Regulation Z requires the estimate to show the date and time the lock period ends. Read that date the day the estimate arrives and put it next to your closing date — the gap between them is your real deadline.
You lose the locked rate and points unless the lender extends the lock — and an extension may be expensive, in the CFPB’s words, or unavailable on the old terms, in which case the loan is priced at the market terms of the day the lock died. If rates have risen, that repricing is a real payment increase decided by a calendar, not by your file. The same repricing can happen without an expiry if the application materially changes mid-lock — a different loan amount, a changed property or appraised value that moves the loan-to-value, a credit or income change, a product switch — because the lock was priced on the application as it stood. The defenses are boring and complete: choose a lock period that covers the timeline with slack, answer document requests the day they arrive, tell the lender before — not after — any change to job, debts or down-payment funds, and treat the lock expiration printed on your Loan Estimate as a deadline you manage, the way you manage the contract’s own dates.
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Homeowner HQ is an AI-powered marketing department for agents and lenders — a relationship and revenue engine, not a homeowner database. A homeowner's record routes them back to their own agent; it is never sold and never shown to lenders.