We had 3 agents round when selling our last property who gave valuations varying by 15%. We went for the middle valuation and it sold within 3 weeks (London, a few years ago) and were pretty happy. I've noticed that the national agency that gave us the highest valuation back then often seems to price properties highly, and then the property fails to sell for a few months until the market has caught up with the high price listed.
I'm interested in other people's experiences of having their properties valued because a property I like seems to be wildly overpriced for the area (which has had an average price rise of only 8% in the last year). I spoke to the agent after viewing and queried the high price, listing 4 of the identical houses (or identical when they were built in the Victorian era) in the same street that had sold within the last year for 30% less, plus one of a similar square footage (albeit a smaller garden) directly opposite the house I like, that has remained on the market for nearly a year priced at 30% less. The agent sounded astonished that I'd got any clue what other houses in the street had sold for, but he should realise that most people will spend a few minutes on the internet checking this. Have you ever felt that some estate agents pluck a price out of the air when giving your property a valuation, just in order to win the instruction?