jfb Posted February 27, 2019 Share Posted February 27, 2019 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. Link to comment Share on other sites More sharing options...
ProDave Posted February 27, 2019 Share Posted February 27, 2019 All our external doors are 1M wide. You will be thankful when trying to get furniture in if you make it wider like that. Link to comment Share on other sites More sharing options...
nod Posted February 27, 2019 Share Posted February 27, 2019 A 910 opening to accommodate a 900 frame 838 door size Probably the most common door size Add 100 mill for disabled access Link to comment Share on other sites More sharing options...
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