For a typical home purchase, you can lock in a mortgage rate for 30, 45, or 60 days, and some lenders offer 90-day locks or longer when a transaction needs more time. New construction gets its own category, with extended locks running 120, 180, 270, or even 360 days to cover building delays. The longer the lock, the more it costs, because the lender is taking on more risk that market rates will move before you close.1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage
Standard Lock Periods for a Resale Purchase
A 30-day lock works when the closing timeline is tight and everyone involved is ready to move. It’s the cheapest option but leaves no margin for the appraisal to come back slow or underwriting to ask for one more document.
A 45-day window is probably the most common choice for a typical resale purchase. It gives enough breathing room for the appraisal, title search, and underwriting without paying for time you don’t need. A 60-day lock buys more cushion and makes sense when your contract has a longer closing or you know there’s a complication coming, such as a seller rent-back or a lender with a backlog.
Beyond 60 days on a resale, you’re paying for insurance against a delay you probably won’t have. Shorter is cheaper when the timeline is realistic.
Extended Locks for New Construction
New construction changes the calculation. Weather, permit holdups, and material shortages can push closings out by months, and a 60-day lock won’t survive that. Lenders offer extended locks of 120, 180, 270, or up to 360 days for buyers in this situation.
Extended locks come with an upfront lock-in fee, and only a portion of that fee may be credited back toward closing costs. If your builder can’t give you a firm completion date, the extended lock is almost always worth the price. Getting caught without one when rates spike costs far more than the fee.
Why Longer Locks Cost More
When a lender locks your rate, it takes on the risk that market rates will move during the lock period. To manage that risk, the lender buys hedging instruments, and those instruments get more expensive the further out they extend. That cost reaches you either as a slightly higher interest rate or as additional upfront points.
The gap between a 30-day and 60-day lock is usually a small fraction of a percentage point. It widens noticeably once you move into 90-day territory, and extended construction locks carry their own fee schedule on top of the rate adjustment. If you’re confident in the closing timeline, a shorter lock saves money. If there’s a real chance of delay, those savings disappear the moment you need to extend.
Extending a Lock When Closing Slips
If closing gets pushed, you can usually extend the lock rather than lose the rate. Extensions run in short increments, and you have to request one before the current lock expires. Wait until after expiration and you lose your leverage, often ending up in a re-lock at worse terms.
Extension fees generally run from 0.25% to 1% of the loan amount, though some lenders charge a flat fee instead. On a $400,000 loan, that’s somewhere between $1,000 and $4,000. A few lenders don’t charge extension fees at all, which is worth asking about before you pick a lender.
Who Pays the Extension Fee
Who absorbs the cost often depends on who caused the delay. If your lender’s underwriting backlog held things up, most lenders waive the fee. If a third party like the appraiser or title company caused the holdup, some lenders split the cost with you. If you caused the delay, expect to pay the full amount.
When the seller is the problem, say they need more time to find their next place, you can negotiate for the seller to cover the extension fee in an amended purchase agreement. Sellers who are causing the delay are often willing to absorb it rather than risk the deal collapsing.
Avoiding Extensions in the First Place
The best strategy is picking the right lock length at the start. The CFPB recommends making sure your lock covers enough time to reach closing, and switching to a longer lock upfront if you’re worried the period might be too short.1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage Beyond that, respond to every lender document request the day it comes in, and push your real estate agent and title company to meet their deadlines. Most extension fees trace back to someone missing a deadline that didn’t have to be missed.
When a Locked Rate Can Still Change
A rate lock is not unconditional. Your locked rate can change if your loan application changes in meaningful ways. The CFPB identifies several common triggers: your credit score drops because you opened a new account or missed a payment, the appraisal comes in higher or lower than expected, your lender can’t verify overtime or bonus income, or you change the loan type or down payment amount.1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage
This is where buyers hurt themselves. They lock a rate, then finance new furniture or a car before closing. That new debt changes their credit profile, and the lender reprices the loan. Don’t open new credit accounts, don’t make large purchases on existing cards, and don’t change jobs between locking and closing. Your financial picture at closing needs to match the one the lender locked against.
Float-Down Options If Rates Fall
A float-down lets you keep your locked rate as a ceiling while reserving the right to drop to a lower rate if the market improves before closing. Not every lender offers one, and the terms vary.
Some lenders include a float-down at no additional cost but only let you use it if rates fall by a minimum threshold, often a quarter to a half percentage point. Others charge an upfront fee, typically 0.25 to 1 point of the loan amount. On a $400,000 mortgage, that’s $1,000 to $4,000. The float-down makes financial sense when the fee is low enough to recoup quickly. If the lender requires a full half-point drop before you can exercise it, the math rarely works.
If a lender offers a float-down, get the details in writing: the minimum rate decrease needed to trigger it, how the new rate is calculated, whether there’s a cap on the reduction, and whether a no-fee version exists. The same label can mean very different things from one lender to the next.
What Happens If the Lock Expires
If your lock expires before closing and you haven’t arranged an extension, you have two options and neither is good. You can accept whatever the current market rate is at closing, which could be well above your original rate. Or you can re-lock, but many lenders apply “worst-case pricing” to re-locks, meaning you get the higher of your original rate or the current market rate. If rates dropped, you don’t benefit. If rates rose, you pay the new higher rate.
An expired lock can also set off a paperwork chain reaction. If the new rate pushes the APR beyond the tolerance thresholds in federal lending rules, the lender has to issue a corrected Closing Disclosure and wait three additional business days before closing.2Consumer Financial Protection Bureau. 12 CFR Part 1026 – Truth in Lending Regulation Z – Section 1026.19 Those extra days can cascade into missed contract deadlines, seller frustration, and in the worst case, a collapsed deal.
Questions to Ask Before You Lock
Rate lock policies vary enough between lenders that lock terms deserve a place in your comparison shopping. The CFPB suggests asking these questions before committing:1Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage
- What does locking today actually mean? Some lenders allow you to lock at application; others only after certain milestones.
- What lock periods are available, and what does each one cost? The Loan Estimate won’t show this comparison, so you need to ask directly.
- What happens if closing is delayed past the lock expiration? Get the extension fee structure and re-lock policy in writing.
- Under what conditions could my locked rate still change? Make sure you understand the credit score, appraisal, and income verification triggers.
- If rates drop after I lock, can I take advantage? This is where you find out whether a float-down is available and what it costs.
Two borrowers with identical credit profiles and loan amounts can end up with materially different rate lock costs simply because one asked these questions and the other didn’t. The rate itself gets all the attention during mortgage shopping, but the lock terms decide whether you actually close at that rate.