We have to put a flat roof on our large houses otherwise they would be too large to ship UPS Ground. This house is built boxed and ready to ship next business day. It's a large house measuring 21"x21"x23"h on the outside and 16"x17"x14"h on the inside. The base is treated plywood that will not rot or decay. The floor is vinyl with removable carpet on top. The walls are lined with Cedar. The floor, walls. and attic are all insulated. The house is heated by a 50 watt infrared bulb that screws into a recessed light fixture in the ceiling. There is an adjustable thermostat right inside the door where you can adjust the temp. The bulb only comes on when heat is needed. The front of the house opens for easy access and cleaning and has the Cat face knob. This house has the commercial door upgrade that will fit cats up to 15lbs.. House has a 20 ft cord. The siding and trim are all Cedar finished with a clear penetrating sealer to bring out the beauty of the wood. The roof is painted the color of Cedar.This house also includes the heated Pad and there is a plug inside the house to connect the heated pad so there is no extra cord to deal with . There is also a weatherproof outlet on the back of the house to plug in a heated bowl or another house. Please note that though one of the pics shows a Green roof this house actually has a Cedar roof. SHIPPING WEIGHT 70 LBS OVERSIZE 25"X24"X25"H.