3 Sep 2019 Who Prepares a Contract of Sale When Buying Property? What is Once signed, is a legally binding agreement between the purchaser and the seller. This is to ensure that both sides are protected in the transaction. 9 Sep 2019 When buying or selling immovable property, it is imperative to safeguard executed may differ as per the agreement between the parties. Generally, there are two types of contracts - the agreement of sale where the property Both buyer and seller sign identical contracts, but only when they are formally exchanged by the You usually exchange contracts between 7 and 28 days before completion – although you Because exchanging contracts means you are legally committed to buying the property, you have to Find a Party Wall Surveyor.