How to fit a door frame

We're replacing an internal door and the existing frame is too wide for the new door. How do you size and fit a door frame from scratch? Worth attempting as a DIY job?

Asked by Kamil on 9th Jun 2026
Expert Trade Answers
"It’s easy enough to do if you know how, but a easy expensive mistake can be made"
Answered on 23rd Jul 2026 - Member since Jan 2026 - report
"If you can’t buy the right width door frame from a suppliers we use a circular saw with a guide set the guide to thickness needed plus 4mm this gives you room for movement either side of plaster isn’t perfectly plumb.

Hope this helps"
Answered on 21st Jul 2026 - Member since Jan 2026 - report
"Say the frame is 760mm the closest door for example would be a 762 door and this would mean planing 2mm of the door and scribing. I would not advise attempting this job yourself if you dont know what your doing"
Answered on 9th Jun 2026 - Member since May 2026 - report
"Hi
Measure your new door in feet and inches. internal doors are usually 2'3" .... 2'6" ... 2'9" etc .go to Covers, Jewsons , Travis Perkins
B&Q as last resort .
Ask for a door lining pack to fit your size .
Glue and screw the head so the legs making sure all pieces are flush.
Come up from the bottom about 9" , neatly brace the 2 legs so they are parallel top to bottom. Add small brace from hanging side leg to middle of the head . Use your square in this corner to achieve 90° then fix this brace...
Hava a nice cup of tea then take your old frame out gently and insert your nice new parallel Square solid frame and fix. Fix the hanging sides first plumb edge and face ! Repeat procedures for the other leg.
Make sure you're frame is "in wind". Do this by looking down one edge of your frame in one room I'm making sure it lines up with the opposite frame edge of the other room.. .
Carefully hang the door then have a lie down lol you've done 👍.
."
Answered on 9th Jun 2026 - Member since Feb 2026 - report
"Best option could be to get the closet size door (wider than frame) if you can't get exactly what fits,then trim in down to fit in the frame,check door manual for maximum trimming allowed
If you still want to fit same door, measure the door and frame,see how much gap is there to be filled,lets say 6cm(60mm) get 2 lengths of wood 3cm (30mm) thickness and width according to your frame,stick them on both sides of frame,then use new beads as door stop or use existing ones if you could
Watch YouTube videos for help, you only need few basic tools for this job"
Answered on 9th Jun 2026 - Member since Aug 2024 - report
"Measure the doors width and height, make a door frame that would suit the door, then fit the door with hinges, fit a piece of timber to the bottom legs so they don’t wobble about fit the door into the whole fix the legs and measure and level,
Then put the door into the hole then fix the hinges, put one screw in each hinge then fix them in place, then put the other screws in, fit the stops , fit handle lock etc"
Answered on 15th Jun 2026 - Member since Mar 2026 - report
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