Mortgage rates will change daily until they are locked in on agency type loans. This includes Fannie Mae, Freddie Mac type loans on conventional and government mortgages. For a refinance transaction, rate locks are good for up to 30-45 days depending on the lender. On a purchase transaction, mortgage rate locks can go from 30-60 days depending on the lender. If there are any delays in the processing of the loan, most wholesale lenders will allow a free lock extension for a a few days but for an extra 10 rate lock extension it will cost a .125-.25% cost. In situations where the market has deteriorated significantly from when the rate was locked, the nominal extension fee may be ok.
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