Are you sure that the amount you offer for a property is realistic? How much research have you done? It is good policy to sign any purchase contract “subject to valuation” – then call in a valuer as soon as you can.
The valuation report will describe the property, comment on any shortcomings and include an analysis of recent sales of similar properties in the area to ensure that the price you are offering is in the appropriate range. You might be able to use the valuation to negotiate the price down – for a few hundred dollars cost you could save thousands.