How to cut standard size external door?

[JohnsonZ]

Hi Bunnings Team,

I've recently bought this external door from Bunnings https://www.bunnings.com.au/hume-2040-x-870-x-35mm-external-door-spm-flush-x1_p1972117, however, the door frame I'm replacing with is not standard size which is 860mm.

A trade doing other things at my house mentioned that some doors are empty inside so it can't be cut. May I please understand from the team or the manufacturer is this door could be cut by 10mm wide from either side? 

[twocutekelpies]

Hi @JohnsonZ there should be a sticker on the side of the door noting how much can be trimmed off, the below was on an internal door I recently fitted but I think all Hume doors state the same - maximum 3mm off each side. Any more than that could void any warranty and/or affect its structure. 

[MitchellMc]

Welcome to the Bunnings Workshop community @JohnsonZ. It's wonderful to have you join us, and many thanks for your question about trimming doors.

For most standard external doors, such as the one you’ve purchased, it’s generally not recommended to cut more than a few millimetres (3mm), especially on hollow-core or honeycomb doors like yours. This could affect the door’s structural integrity, its ability to hang properly, and even its weatherproofing.

For a door that needs to be reduced by 10 mm in width, the safest approach is to either order a door in the correct size or check with our Special Order team in-store if a custom-width option is available. If it’s a solid timber door, small adjustments might be possible with careful trimming, but with a hollow or composite external door, I would not attempt to cut it yourself.

Please let me know if you have any questions.

Mitchell