1. Loan program.

2. Interest rate.

3. Points.

4. Length of the lock.

The longer the length of the lock, the higher the points or the interest rate. This is because the longer the lock, the greater the risk for the lender offering that lock.

Let's say you lock in a 30-year fixed loan at 8% for 2 points for 15 days on March 2. This lock will expire on March 17 (if March 17 is a holiday then the lock is typically extended to the first working day after the 17th). The lender must disburse funds by March 17th, otherwise your rate lock expires, and your original rate-lock commitment is invalid.

The same lock might cost 2.25 points for a 30-day lock or 2.5 points for a 60-day lock. If you need a longer lock and do not want to pay the higher points, you may instead pay a higher rate.

After a lock expires, most lenders will let you re-lock at the higher of the prevailing market rates/points, or the originally locked rates/points. In most cases you will not get a lower rate if rates drop. In some cases, prior to the rate lock expiration date, the lender may allow you to negotiate a rate lock extension at the original rate/points. An additional fee may be charged for this extension.

Lenders can lose money if your lock expires. This is because they are taking a risk by letting you lock in advance. If rates move higher, they are forced to give you the original rate at which you locked. Lenders often protect themselves against rate fluctuations by hedging.

Some lenders do offer free float-downs––i.e. you may lock the rate initially and if the rates drop while your loan is in process, you will get the better rate. However, there is no free lunch––the free float-down is costly for the lender and you pay for this option indirectly, because the lender has to build the price of this option into the rate.For example: the float-down rate may be 0.125% to 0.25% higher than the prevailing current market rate.

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What happens if rates drop after you lock?

Most lenders will not budge unless rates drop substantially (3/8% or more). This is because it is expensive for them to lock in interest rates. If lenders let borrowers improve their rate every time rates improved, they'd spend a lot of time relocking interest rates, since rates fluctuate daily. Also, they would have to factor this option into their rates, and borrowers would wind up paying a higher rate. If rates drop, one option is to go to a different lender. In this case, you would be starting the loan process from the beginning. If you have your loan with a mortgage broker, however, they'll probably be able to move your loan package (including application) to a new lender offering lower rates. Before applying with a different lender, inform your original lender that you are aware that rates have dropped. You may be pleasantly surprised to find that they will work with you rather than lose you to a competitor.

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Lock-and-Shop Programs

Most lenders will let you lock in an interest rate only on a specific property, which means, if you are shopping for a home, you cannot lock in an interest rate until after you sign a purchase contract for a specific property. If you are shopping for a home, some lenders offer a lock-and-shop program that lets you lock in a rate before you find the home. This program is very useful when rates are rising. However, lock-and-shop rates are usually higher than the prevailing market rate. Also, the lender may charge a non-refundable fee or deposit towards closing costs.

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New-Construction Rate Locks

Most lenders offer long-term locks for new construction. These locks do cost more and may require an up-front deposit. For example, a lender might offer a 180-day lock for 1 point over the cost of a 30-day lock, with 0.5 points being paid up-front, as a non-refundable deposit. Most long-term new-construction locks do offer a float-down––i.e. if rates drop prior to closing, you get the better rate.