Choosing the right door size depends on the dimensions of your existing rough opening. A standard interior door typically measures 80 inches in height and 24-36 inches in width, but precise measurements are key for a perfect fit. To determine the correct size, the rough opening should usually be about 2 inches wider and 2 1/2 inches taller. than the door slab itself—allowing room for the frame and shimming during installation. If you have an opening that is 82 inches heigh and 32 inches wide the door required for that opening would be a 30×80″ Doors.  At JK Luxury Home Remodeling, we take exact on-site measurements to ensure your new door fits seamlessly, whether it’s a standard pre-hung unit or a fully customized size for older Toronto homes.