The softening real estate market that's driven down home prices in the Lower Mainland is spreading to the B.C. Interior, experts say.

The Real Estate Board of Greater Vancouver reported Wednesday the average price of a detached home in the area fell 4.3 per cent over the summer, down from record highs set in May, the result of more houses being put on the market and fewer people buying.

Those in the industry say the slump is now being felt as far away as the scenic town of Kimberley, nestled in the mountains of B.C.'s Kootenay region.

There are over 150 residential properties for sale in Kimberley, and local real estate agent David Graham said sellers are no longer getting their asking price.

"Buyers are typically offering $10,000 or $20,000 below asking price when even just a year ago we were getting full price or over in some cases, so there is no doubt it is a changing market," Graham said.

Ian Mason with the Kootenay Real Estate Board said that market shift is happening throughout the area.

"I think we are seeing the markets adjust from the overheated situation we had last year," he said.

"If it's not a buyer's market, I'm not sure what a buyer's market would look like. If you've got that much product and sharp decline in sales certainly that is what a buyer's market looks like," Mason said.

The board has seen a 70-per-cent increase in the number of listings, while sales are down by about 35 per cent.