At least another year imo of major price drops. Banks have said it will be two years before they get back in the swing of things. Give it 5 and the new directors/mangers will have this great idea of lending money to those who cant afford it again or some other brand new idea.
Seeing prices near me which have gone for flats say 250k (many were costing more due to a bidding war by potential buyers from what i saw on house price sites) now 185k or less in the adverts so you know they expect less.
I think prices are already 40 percent less (not advertised price but the difference between the madness a year or so and now what you would have to ask to get a sale.
I can now pick up a 3 or 4 bedroom house in a nice street for less than what was asked for a newbuild upscale flat in early 08. All the new bulid flat sales companies are offering us crazy prices for groups of flats ( i dont want them i only want one gaff in the UK

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Many of the actual housebuliders appear to be renting out flats now just to keep them occupied, so maybe worth investigating in the area you like the look of.
I see lots of vacant propties nearby from all levels of the propety market so prices will drop even further due to high over supply.
I truley belive in my area of london houses/flats will soon be 25 percent of there peak value if not lower in cases where people have to sell or move.
Not nice for recent owners but im sure the older ones of you have see it all before.