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Minimum internal door width?

  • 10-04-2022 8:16pm
    #1
    Registered Users, Registered Users 2 Posts: 4,785 ✭✭✭


    Hi,

    Tried googling, found some info but seems to apply to commercial, apartment blocks etc.

    So do you know if there is a minimum door width, downstairs if relevant, required by regs for an existing house - built 2004? I ask because I need to add insulated slabs to a wall, and for some reason the builder put the entrance to the livingroom right up against the wall in question. In fact, as it is, the plain PB covers some of the architrave. So I'm thinking of removing part of the frame, shave off 50-60mm and have the frame set out from the wall giving space for the insulated board, then trim door to fit (slab door with no details, so will look okay).

    Existing door is 800mm approx, and after would be say 750mm. Not much at all, but would make the job look better rather than covering even more of the frame.

    Thanks.



Comments

  • Moderators, Society & Culture Moderators Posts: 40,340 Mod ✭✭✭✭Gumbo


    Technical Guidance Document Part M covers dwellings.

    Section 3 from memory, internal circulation.



  • Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 18,447 Mod ✭✭✭✭DOCARCH


    You may need to consider moving the door!

    What width is the existing door leaf?



  • Registered Users, Registered Users 2 Posts: 4,785 ✭✭✭KungPao


    Thanks for the comments.


    @DOCARCH As in the actual door only? 80cm in new money.

    Thing is, I need to replace plain board on adjacent wall with insulated PB, and it needs a certain thickness to comply, so it's either leave as is with a cool wall, reduce door, or use thin insulated pb and not comply, or use the required size and cover half the architrave which would look shite, plus the handle would be closer to wall and not open to 90 degrees.

    Looking at the part M, it seems I could get away with 775 door size, which would help.



  • Registered Users, Registered Users 2 Posts: 39,900 ✭✭✭✭Mellor


    In 2004 800mm would have been the minimum. (810mm ideally).

    775mm is nowhere near compliant for a new door. You'd need an 840mm (2'9") to be compliant. Check Part M again, you mixed clear width and door width.



  • Registered Users, Registered Users 2 Posts: 417 ✭✭Doolittle51


    You won't be able to shave 50mm off a door. If it's a traditional mortice and tenon door, it'll fall apart. A modern door is mainly made from particle board with a 10mm real wood edge. Taking 50mm off just won't work.

    Moving the door over a few inches is probably the best option. Tricky if it's a block wall, not so difficult if it's a stud wall.



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  • Registered Users, Registered Users 2 Posts: 4,785 ✭✭✭KungPao


    Thanks for the comments, much appreciated.

    on further inspection, they used massive dabs of adhesive, so I think I can fit in an insulated board closer to wall and at worst cover same part of frame as existing board.

    I think it will meet insulation regs with the cavity insulation plus board. Even if it doesn’t, it’s all I can do practically speaking.



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