Signing the Loan Estimate does not commit you to the lender. Instead, the Loan Estimate outlines the costs and terms of the mortgage.  While signing the Loan Estimate indicates that you have received and reviewed the document, it does not obligate you to accept the loan.  However, signing it tells the lender to proceed with the loan process. As a result, the lender may begin processing the paperwork, including a property appraisal report and other verifications, to determine whether you meet the loan requirements.