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Opening for front door


jfb

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I have to make a new opening for the front door of a small barn conversion. This has to be done now before I actually have a door/frame because I am insulating below slab.

I don't know yet whether I will buy a new door, get one from ebay or get one made by a friend locally but think I should make it a generic size so I can most likely avoid problems later.

Looking at some websites it appears 838mm is a pretty standard size and the one I rang up said that their external door frames add an extra 70mm.

Should I add on another 15mm so set the opening at 923mm? Less, more? Is 35mm for a frame edge pretty standard?

I am planning on making a temporary frame to build around.

Any other advice appreciated.

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