Very thin wood. Dog house was falling apart before I even got it put together! Hole is so big in the frobt it offers no wind or protection from the cold. Floor just sits in and buckles after a few uses. Three heavy rains and the roof is buckling in 2 places. Black paint around trim fading after only a month. This dog house is pretty to look at, but if you want a heavy, well insulated house for your dog, don't buy this unless shade is all your dog needs it for.