A RICS Registered Valuer has the knowledge and experience to carry this out for you and that valuation has legal standing in a court of law.
The purpose of an estate agent is to sell a property for his client for the highest price. An RICS Valuation establishes the Market Value “The price a willing seller and a willing purchaser will agree”.
If there are many willing buyers for a property, the value will be established through competing bids and will be higher than for a similar property for which there is only one purchaser. The opposite is also true!
If you are purchasing a property without the need for borrowing you should still have a Valuation undertaken so that you know that you have not paid too much.