increase interior door height to accomodate standard height doors

Discussion in 'Wood / Woodwork / Carpentry' started by clairej2000, 1 Oct 2018.

  1. clairej2000

    clairej2000

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    Hi,

    I'm looking to replace my internal doors within my 1930's property. Due to a loft conversion we also require these to be firedoors.

    4 of my door frames (not load bearing walls) are short and are 188cm tall meaning we can't hang standard height doors and are not able to cut 10cm's of fire doors.

    I am trying to gather what is involved in this job? I obviously need to have door frames and architrave removed. who would be best to do this job? is this a diy job or do I require a builder? If so in what region would you expect this to cost per door?

    Many thanks
     
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  3. conny

    conny

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    I'm not sure of the construction of your fire doors but would it be possible to take 5cm, (2" to us oldies lol), off the top and 5cm off the bottom to get the necessary fit?
     
  4. JohnD

    JohnD

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    you aren't allowed to cut anything off the top of an ordinary certified firedoor. You can cut specified small amounts off the other edges.

    You could probably order one made-to-measure though.
     
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  5. noobiediyer

    noobiediyer

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    I'm in pretty much the same boat. What did you do in the end? If you raised the doorways, how much did it cost so I have a rough idea for myself? Thanks
     
  6. JobAndKnock

    JobAndKnock

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    If you need to lift the head if a door and the wall is masonry you will need install a new lintel and potentially new padstones. If the wall is timber stud you just need to install a new, probably doubled, header above the door opening. There is a considerable difference in the amount of work and the costs I evolved, especially if the wall is load bearing (and bear in mind that there are such things as load bearing timber stud walls). Before you can estimate the poteñialcost you do need to define what the wall structure is
     
  7. JohnD

    JohnD

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    You might like to investigate the cost of a certified, made-to-order door.

    I think I saw them mentioned on the Premdor website.

    Fire doors are often just a slab of chipboard with some trim and ornamentation added.
     
  8. noobiediyer

    noobiediyer

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    Made to measure doors have a huge lead time of up to 20 weeks. I've rung numerous companies and it's the same response. They all seem to get their doors from companies in other countries. They're also a huge cost.

    I'd rather put that cost towards the work of getting the door way increased to standard height.
     
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  10. JobAndKnock

    JobAndKnock

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    In my experience pretty much any manufacturer of pre hung door sets will offer made to measure fire doors produced in house. I have two within 15 miles off me that I have dealt with, but they aren't retailers.

    In the past I'd have said that someone quoting 10 weeks because the materials come from abroad is presumably buying in from India, Malaysia or Indonesia because lead times here were shorter (normally 4 to 6 weeks on made to order fire doors, pre pandemic). But then then I've been quoted 10 to 12 weeks on cement board today (UK manufactured, and that is a £10k order) and the same on larger section C24 structural graded softwood, although granted that comes from Russia via Germany. Delivery times on building materials are all over the shop at the moment and some prices are ridiculous
     
    Last edited: 8 May 2021
  11. JohnD

    JohnD

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    what country is Barnsley in?

    http://www.premdor.co.uk/about
     
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  12. ktuludays

    ktuludays

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  13. noobiediyer

    noobiediyer

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    I can't see any mention on their website that they do made to measure FD30 doors.
     
  14. JobAndKnock

    JobAndKnock

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    They always have (as they are pretty much the largest door manufacturer in the UK). Why not ring them on Monday and enquire?

    The construction industry isn't always 'net friendly, partly as so many product variations available, partly because so much stuff is bespoke and partly because many transactions are B2B, not on the 'net. So just don't expect all the answers to be out there in the ether
     
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  15. noobiediyer

    noobiediyer

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    I understand, thank you. Will try them on the phone on Monday.
     
  16. DIYnot Local

    DIYnot Local

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