I want to replace my exterior back door with a new model/etc of the same size. What I'm wondering is if I have to replace the frame of the door as well or can I simply just buy the door and bolt it in? The door size is typical/standard back door size.

What should I consider doing? Replace the whole thing or just the door? Any opinions?

  • Post a photo? Climate? Siding type?
    – Bryce
    Commented Apr 26, 2014 at 6:34

2 Answers 2


It will often cost less to replace the door and frame as a unit. Custom-fitting a door is a fussy process. A pre-hung door and frame as a pre-matched set is a factory-built item. If you can get over the horror of ripping the frame out, it's generally faster to complete the job, as well.

However, if your doorframe is an architecturally significant old thing, replacing just the door may be the better approach - most new doors & frames are best for replacing cookie-cutter ticky-tacky doors and frames as found on many, but not all houses; they will look just the same, in most cases. [pun intended - RIP, Mr. Seeger]

  • I had a feeling this was the case and I'd rather just get it over with and do it correctly. So a pre hung is going to be what I go with. Thanks! Commented Apr 26, 2014 at 21:50

It is far easier to replace just the door, as long as the frame is in good shape. You avoid all need to interact with the siding or weatherproofing of the home, for example.

Cutting the door can be fussy, but a good lumberyard (or perhaps big box) can help. You'll need cuts for the overall frame (not necessarily square), hinges, and doorset lock.

  • Some other things to consider, mortising in the hinges can be difficult for a novice, the original casing may no longer be square and the original door may not be a standard size.
    – mikes
    Commented Apr 24, 2014 at 19:43

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