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Hi, looking for some advice on my Architects chosen door sizes on my new build. I am comparing some of the sizes from the single doors attached and not really finding an easy match. Just about to have the openings built with blockwork so would appreciate any advice. Block to block is 910mm and the 810mm one is a smaller toilet door under the stairs. Heights vary on the images depending on what floor the door is on, 2110mm high to blockwork opening in the basment which will have 2400mm high ceilings. Do you think I will find it easy to buy doors without them having to be made bespoke sizing? Would I purchase a door frame kit for these openings or just have them made up to suit? Thanks C

I may have been a little enthusiastic with my floating floor insulation for the Little Brown Bungalow, and I now need some shorter than normal doors. A classic oversight. The arithmetic is that I have specified 50mm Celotex between 36.63mm battens on their side, them 18mm OSB, then underlay and a floor covering (laminate, engineered wood, vinyl or carpet depending). That equals a need to cut off approx 63+18+10 = 90-95mm, plus any air circulation gap I decide I need. There are 6 doors. The plan had been to go with Geneva or perhaps Shaker style oak veneer doors from someone like Todd Doors, where they can be bought for £60-80 inc. VAT. Existing doors are standard imperial 1981mm height. So without butchering the doorframes, and I do not plan to go there, that means I need doors which can be trimmed by almost 4 inches, or find a supplier of shorter or custom doors, or reduce the floor depth. Options seem to be: 1 - Bespoke eg pine doors. These seem to start at £150-£200, so are probably a non-starter. 2 - Find some doors at OK prices which can be trimmed to about 1890mm, or by 90mm. The best I have seen so far are the Todd Doors' doors which can typically be trimmed by 50mm base and 12mm top = 62mm total. 3 - Use slab plywood doors trimmed as needed and recapped. The bungalow had slab doors before, but I was planning on a more upmarket feel. 4 - Reduce floor thickness - could be done by using 36x63mm battens on their face not their edge and 25mm Celotex not 50mm. That would give me an additional floor depth of 36 + 18 + (8 to 10) which can just squeak under the 62mm cutting limit of the Todd Doors. I would need to store or sell the pallet of 50mm Celotex sheets I have already purchased, and buy 25mm. I will have a use for the other within a few months. Any comments - particularly for trimmable doors - would be welcome. I need to decide this over the weekend at the latest. Ferdinand

Is there a requirement for timber internal doors to be fitted in order to obtain a BC completion certificate? These are not fire doors.