This is a bundled large size ready to ship Basic House. It measures 21" x 21" x 22"h on the outside and 19" x 19" on the inside. All interior surfaces are covered with carpet for warmth and the floor is insulated and also covered with carpet. The siding and trim are left Natural and finished with a clear penetrating sealer. This house includes the large door upgrade that will fit the biggest cat and a round window. The Basic House is not fully insulated and is meant for areas with mild winters.