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I'm measuring for 2 replacement windows and a composite front door in my 1960s bungalow. I've been putting it off as I can't find anyone to install only (I supply) but I really need to get on with it so I can get the failed CWI sucked out and replaced ... looks like I'll have to learn how to DIY. I think I'm going to order from Russell Timber. They're good value/spec and the windows look pretty similar to my other (expensive) windows. Door says it's 58mm Insulated Timber Veneered Composite Door hung in a 80*57mm Hardwood Laminated Frame. I'm stuck on how to work out the threshold details so I can measure the height of the door - and the width. HEIGHT I think I have to measure from the top of the existing door frame where it meets the horizontal wood bit (not sure what you'd call this? Soffit maybe). I've measured to the bottom of the sill outside at the threshold which is almost at the level of the finished floor inside (I'm not planning on a new floor, it's solid bamboo laid on top of old parquet with something like Timberlay gold underlay). I need to work out where the bottom of the door will end if that makes sense. The new door just has a thin aluminium threshold bar (see drawing) - Russell say they have different sill options. THRESHOLD DETAIL The existing door seems to be plonked on top of messy bricks and cement/mortar (photos). I’ve done a sketch but I don’t know what’s inside the threshold! The composite door will need to sit on something? I'd like something with better thermal properties than concrete. Do I need to remove some/all of the bricks under the existing door? I've been looking at insulated thresholds and came across Partel and Triotherm insulated door thresholds (there's also Compacfoam). Anyone used any of these products? see https://www.prodomo.ie/thermal-brackets/triotherm-as-thermal-base-for-doors/ So where do I want the door to end in terms of measuring for the height of the unit? It's not going to be a level threshold because there's a step down outside. What would you do? the wall is 280mm deep on the left (from outside) so will I need to place the door further back so it spans more of the cavity? DOOR WIDTH I've measured the door width outside - basically just brick to brick. The smallest measurement is 928mm. However the internal width is 898mm and if you look at photos there's not much room to play with internally. If I ordered 928mm less 20mm tolerance = 908mm wide this is still 10mm wider than the internal measurements. Does this matter? I don't know how thick the plaster is. The plaster is wet plastered straight on to block walls. Any suggestions/comments would be appreciated. This is all new to me. Or suggestions for people who could install (J9 of M25). Thank you