We bought a competitor brand dog house (A-frame), but they did not offer a door. WARE's doghouse opening is similar in dimension, so we thought we would try to apply this door to our doghouse. The dimensions fit our doghouse perfectly. The door lines up exactly covering the door opening perfectly. No overlap and no major gaps on the sides. The length is also perfect. It sits about 1/4" above the house floor. You could adjust this depending on where you screwed it in to the frame. The plastic is a good thickness, helping to keep the flaps flat and rebound back to the "close" position in the door opening. Our doghouse does not have the predrilled holes, but it was easy enough with wood screws to attach. Our dog took to the use of the flaps easily with the use of treats and a short training session of In and Out. I would recommend this door! Just be sure that your door opening dimensions match.