In most cases, the buyer and the buyer’s lender require a new or current survey which is guaranteed or certified to them to be accurate. As such, the contract usually requires the seller to provide a new map. However, surveyors will often charge less to revise an existing survey than to prepare an entirely new map. Therefore, an existing survey is often useful. Under certain circumstances (usually when no lender is involved), the parties may be able to agree to use an existing map (or no map at all) in order to save time or decrease cost. This would need to be recited in the contract and you should consult with your attorney before he or she approves the contract on your behalf, to determine if this might be an appropriate option.