Posts: 5,733
Threads: 2
Joined: Dec 2004
Location: Fort Worth
Done lots of those projects myself...
Just like Jgrout said is how I do it.
I would cut it down and put it in. However a replacement would be easier but solid core doors aren't available locally anymore as they are all special order. A steel door is the recommended door for garages and they are carried everywhere for around 100.
Check the restore then if nothing cut it to fit. Our restores are pretty bare these days as they don't get the donations they used to. Some are nice stores some not so. Ours has goofy hours being closed Sunday and Monday and any day touching a holiday.
Posts: 29,152
Threads: 1
Joined: Aug 2002
you are taking in to assumption that a 2'10" wide door is going to be readily available..
IME that is a custom size door 3'0" yes 2'8" yes 2'10" pretty rare in fact so odd that I can only recall making or hanging two doors this size in 20 yrs......
so if the door is solid core like the one I posted you can cut down a 3'0" door easily but just cut one side ( the lock side if bored) and just enough to clean the old mortises off the hinge side Why restile both sides when one will suffice
Now a F&P door you have a new issue and that one is that you will have to cut off 2" on both sides to keep the stile somewhat correct and then it is going to lose most of the structural integrity built into the unit.
Besides it also means you will be boring a new lockset hole into the lock rail now and dealing with part of a hole left from the old bore that has to be patched.
Service project or not, IMO you are asking for more trouble than a hundred buck door would cost to replace the door properly
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