Blocking up door opening with timber frame

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Buckinghamshire
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Morning all,

After a bit of advice on methods of blocking up an external door please. Background: We have a small annex above our garage with a link extension built between garage and house which is now a dining room (all done by previous owners of the house). In this now large dining room there is a front door (the one to be blocked up), back door and bifold doors - so I think from the BC point of view there is no issue with removing an escape route from the bedroom above the garage if we block off the door as the backdoor and bifolds will still be in place but grateful for thoughts on this also.

We'd like to block off the bottom half of the door and install a window in the top half to gain more usable wall space and to get more light into this dark corner but also because we are having the floor levelled inside and covered in Karndean which will actually stop the door from opening as the threshold is so low (not a problem with back door or bifolds as they open outwards).

I'd like to think that I'm a very capable DIY'er but brick work is just not an area I've ever ventured into! I'm too OCD with measurements of things that you need to mix and then end up making a mess of it :LOL:. I have a load of PIR board left over from other renovations in this house so I'd like to enquire whether it's ok to use timber frame to block off this bottom section of the door (which I'm quite happy with doing).

The make up would be (from inside out):

Skimmed plasterboard > treated timber fixed to existing door rebate, frame filled with rockwool and expanding foam around edges > PIR board, as much as is needed to fill the depth of the aperture (probably 100-150mm from looking at it) > treated timber frame filled with rockwood, sealed with expanding foam etc as above > Concrete based board > render to match existing.

The window will be fitted by a FENSA installer so it's just the frame that I'll be doing. Nothing else should really need to change - lintel etc. is already in place.

Grateful for thoughts on this approach and whether or not BC should be notified.

Many thanks in advance,

John

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I would have thought you will need Building Control approval ( not Planning Permission ) , mainly to make sure they are happy with how you are infilling the void and keeping the integrity and u-values to current specifications
 

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