Quick Answer
A rate lock is your lender’s guarantee that your interest rate, and usually your points, stays put for a set number of days. It protects you if rates rise before closing. The tradeoff is that you usually can’t grab a lower rate if the market drops, unless your lock has a float-down option.
You keep hearing “rate lock” thrown around, and it can feel like one more thing you’re supposed to decide without really understanding. I’ll walk you through exactly what a lock is, when buyers typically lock, and the calm, long-view way to think about the timing. This is a timing decision, not a mystery, and once you see it clearly you’ll know exactly what to ask. That’s what I’m here for, and I’m on your side the whole way.
What a Lock Actually Guarantees
A rate lock holds your interest rate, and usually your points, at a promised level for a set period. That period is most often tied to your expected closing date, so your lender is essentially saying, “Whatever rates do between now and closing, you pay the rate and points we agreed on.” The lock protects you from rising rates during your home buying process.
It does not guarantee things that happen outside the rate itself, like the loan program ending, your credit changing, your income changing, or the appraisal coming in low. Those are separate pieces of the transaction. The lock is about the rate and the points, not about approving your loan. If you want to understand how the rate you are quoted relates to the cost of borrowing, read my answer on the difference between APR and interest rate.
Typical Range
Lock lengths vary by lender and loan program. Common periods are around 30, 45, or 60 days, and longer locks are sometimes available for an added cost. Rates and lock terms change constantly, so confirm the exact length, what it covers, and the cost with your loan officer at the time you lock. This is a typical range, not a fixed number. Before you agree to anything, it pays to know what to ask your loan officer before making an offer.
Lock vs Float
“Locking” and “floating” are the two ways to handle your rate between now and closing. Lock and you are protected from increases, but you generally can’t take advantage if rates fall. Float and you can catch a drop, but you also risk an increase. The right choice depends on how far out you are and how much certainty you need.
Lock
Your rate and points are set for a defined period. You are protected if rates rise. You usually cannot lower your rate if the market drops, unless a float-down is included.
Float
Your rate is not locked yet, so you can catch a drop and lock later at a better number. The risk is that rates move up while you wait. The decision comes down to how far out you are.
Floating feels exciting until it doesn’t. If you have a closing date on the calendar and the numbers work, most of my clients prefer the peace of mind of a lock. If you are still early and watching the market, that’s when a float or a temporary lock can make sense. Talk it through with your lender, and come prepared with the right questions from my guide on what to ask your loan officer.
When Buyers Usually Lock
Most buyers lock once they are under contract with a closing date, because at that point there is a real, scheduled date the rate needs to survive until. Locking then removes the uncertainty that would otherwise hang over the final weeks before you close. Before you are under contract, some lenders offer a temporary or longer lock so you can hold a rate while you shop.
Patrick Teaching
I tell first-time buyers not to overthink the lock. The moment you have a signed contract and a closing date, you know the date your rate needs to last until, so most people lock then and move on. The goal is to remove uncertainty from the home buying process, not to add a new worry. Understand when your contract actually starts so you know exactly what triggers that closing-date timeline, and know what to expect on closing day once you get there.
The “Don’t Chase the Last Eighth” Rule
Here is where a lot of buyers get tripped up. You see rates move down a little and you think, “If I just wait a bit longer, I’ll get an even better number.” The problem is that waiting to catch one more eighth of a point can mean missing the bus entirely, and ending up paying more than the rate you held out against. The gain you are chasing is small. The risk of the market moving against you is real.
Patrick Teaching
My calm, long-view advice: don’t hold out for one more eighth of a point. It is rarely worth the risk. If the rate works for your budget today, that’s the number that matters. Lock it, protect it, and get on with the business of buying your home. Knowing which loan is best for a first-time buyer matters far more to your long-term financial picture than a tiny difference in your rate.
What If Closing Gets Delayed
A lock is tied to a date, and closings get delayed. If that happens, your lock can expire, and you may need an extension, sometimes at an added cost, or the rate may need to be repriced. The worst thing you can do is stay quiet and let the lock run out. Tell your loan officer as soon as you know the date is moving, so everyone can plan for it instead of reacting to it.
Delays happen for all kinds of reasons, and most are solvable if you flag them early. Learn how to handle it when your closing gets delayed, and understand what happens if you miss a contract deadline so you are never caught off guard.
What to Ask Your Lender
Before you lock, get the details in writing. Here is a short checklist of the lock questions I want every buyer asking.
- How long does the rate lock last, and does it line up with my expected closing date?
- Does the lock cover my points and fees, or just the interest rate?
- What is the cost to extend the lock if closing is delayed?
- Is a float-down option available, and does it come with a fee?
Take these with you when you speak to your lender, along with the fuller set of questions in my guide on what to ask before making an offer. When you get multiple quotes, use my walkthrough on how to compare loan estimates so you are comparing apples to apples.