Standard Prehung Door Sizes
Standard Prehung Door Sizes? What Size Door Fits?
The first step in ordering a new prehung door is determining what size opening you have to work with. This door size chart will help determine the width and height of door units to order. Interior and exterior have similar but also different considerations so make sure to read this chart carefully.
The door slab widths and prehung unit widths are included for both interior and exterior doors. The heights for both interior and exterior doors are listed for the slabs widths only across the top and the finished prehung unit heights.Make sure you are looking at the measurement that applies to the correct unit you are looking to replace.
All exterior doors are 1 3/4″ standard slab thickness and all interior door slabs are the standard 1 3/8″ thickness. The standard door frame width (thickness) is 4 9/16 for interior and exterior doors although the frames are different in composition. All our exterior doors are NO-ROT composite to withstand the exterior elements and are stronger.
Standard Prehung Door Sizes Do Not Include the Door Trim
Interior and exterior door trim is not a consideration when calculating the opening width. The frame of the door width and height is all you have to fit INTO the opening. The trim is the part that gives the finished look between the door frame and drywall or outside stucco. It OVERLAPS both areas. Measuring that will result in too large a prehung door to order. Ask your contractor for the “rough opening” or what “finished size” door he wants.
Prehung doors do not include the exterior trim necessarily unless requested. We recommend exterior composite brickmold but there are variations. There are small and large brickmold options but some home do not require brickmold at all. Some homes use an alternative, hardi-siding. This can only be determined by the door installer onsite since he can see which the finish details would work the best.
For interior doors they are hung on 4 9/16 primed flat jambs and can come with or without colonial primed trim. Other jamb sizes can be special ordered if needed. This must be specified also since homes can have interior finish details that are custom.
