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@nefarious is right hanging a door is tricky and can go wrong, even for us pros.
Does it sound feasable to take the door and have it trimmed to the required width?
No because no cutting service will cut the door for you. They don't want to take responsibility for the measurements being wrong. Plus as has already been mentioned you are much better off offering the door up, marking, cutting, then repeating the process until the fit is perfect. Hanging doors is a drawn out process; after many years of doing it and many, many fuck ups I can hang 3-5 doors a day depending on the frames or liners.
As far as cutting the door down 40mm is a lot to take off a door. Most manufacturers have a maximum trim that is usually ~ 20mm. If the maximum trim is exceeded at best you will void the warranty at worst you'll wreck the door and won't be able to use it.
I need an advice to replace the front door, please.
I would like to do that my-self. Never done it before and I have this situation. The new wooden door is about 40mm wider that the old one and not sure what is the best course of action for DIY.
Does it sound feasable to take the door and have it trimmed to the required width?
I am asking that as checking the existing door frame I would imagine all its parts are made from 3 individual "blocks" of wood(appologies as I am not familiar with the technical terms for them). I am refering to the 2 vertical sides and the top horizontal ones. As such I consider that trimming one or both of the vertical parts to acommodate the 40mm wider door is a harder task with a very good chance for me to make it unusable.
Any inputs for a DIY solution are very welcome. Thanks!