What is RESPA?
The Real Estate Settlement Procedures Act (RESPA) contains guidelines regarding the settlement or closing costs you are likely to face. Within 3-days from the time of your mortgage application, your lender is required to provide you a "good faith estimate of settlement costs" (GFE) based on their understanding of your purchase contract. This estimate will indicate how much cash you will need at closing to cover prorated taxes, first month's interest, title services, appraisal, transfer taxes, and other settlement costs. These estimates are pretty much locked in stone and cannot vary more than 10% for actual final costs.
RESPA requires lenders to give you an information booklet about settlement costs, written by the U.S. Department of Housing & Urban Development which address how to negotiate a sales contract, ways to work with professionals like attorneys, real estate agents, lenders, etc, and your given rights as a home buyer. It gives an example of the Uniform Settlement Statement used at your closing. You are entitled to see a copy of the statement 1-business day prior to closing indicating your final costs.