I am 'owner' of a villa in Belgium. Villas in Belgium vary between 250K to 750K for a normal family 3 to 4 bedroom house. Typically a house has 1 kitchen, 1 bathroom. The price is very dependent on the location! Well we saw the monthly gas+elec price of 150 euros before the crisis, suddenly go 6-fold, so we did worry a lot. We decreased our heating a few degrees and used a lot more bio fuel during winter. Lately the price is about 3 or 4 fold the price of before the crisis.

Edit: by villa we typically mean a house that is not adjacent to another house.