How to secure 120cm aluminum framed door in a 126cm gap ??


23 Jul 2010
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United Kingdom
To maximize light and improve view of garden I am looking to replace an old 'uPVC French double door' with a 'single Aluminum Framed door'.
This is an outside rear door.
I want as much glass as possible with the least amount of frame (the uPVC french door is all frame).

I have some DIYer experience of putting in uPVC doors and windows.
But these have all been made-to-fit for the the hole and so easy for me to secure normally using framing screws.
And I have never fitted an aluminum framed glass door

The issue is that my brick framed hole is 1260mm wide, but the widest aluminum framed glass door I can get is 1200mm.
I cannot find any Aluminum Framed doors wider than 1200mm.
So there is a total gap of 60mm, normally resulting in a 30mm gap on the left and right of the door.

This door will be heavy when opened and I am worried how best to secure the door to the brick surround with this large gap.

This is the type of door I am wanting to fit (not bought it yet).
Screenshot 2023-12-05 at 17.59.29.png

Any best fit suggestions to secure this 120cm aluminum framed door in a 126cm gap please??

Thanks, SFK
Last edited:
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Stick with hardwood and long screws to secure the frame. If you are not bothered about centration, perhaps the 60mm gaps can be on the side of the door handle.
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Many thanks to both.
Was looking at steel rectangular box section.
And also at hardwood - so glad I am looking at correct direction.
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Steel box section may be strong but mounting to wall may be easy, the door mounting to box may bring its challenges.
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75 x 25mm softwood packer either side or whatever is needed to match frame depth, shim up and foam

then fit matching aluminium cover trims

just a thought: you need to make sure the door cill supplied is long enough, same with any head trim supplied.
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door cill supplied is long enough
Notch, with thanks for that.
Good point about the Door Cill, reminded me that was planning to slightly over wide so can have it a cm or two over the surrounding wall (have a notch cut taken out on each side). Will have to reconsider that as might look overwide with the cover trims also in place.
Many thanks, SFK
the door mounting to [steel] box may bring its challenges

I would normally use self tappers (into pilot holes) into steel box Section. .
But, you are correct about challenges as never done that with a door before as normally have allowed a bit of slack for thermal expansion of (uPVC) frame.
Looking as if the wood is the correct route. With wood I can affix to the wall at many multiple point to distribute the load of the door.

Thanks SFK

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