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Hi, newbie here, about to (hopefully) embark on my first extension. The extension is a narrow 2 storey extension to the side of the house. It will involve removing a large portion of the existing gable wall at both ground and first floor level. My concerns are about the buildability of the works involved in knocking through, bearing in mind we will be living in the house during the works. I thought I'd try and get a general consensus here before wasting the time if any builders. First concern is when the knock through may need to be done. Ideally I'd like the side extension built and made waterproof and insulated prior to taking down the walls, but I am concerned if this will be possible when looking at the installation of the steels and also new staircase? As a complication, the cavity walls were filled with beaded insulation 20 odd years ago and I am concerned how much I will lose when knocking through? I imagine I will lose all of the insulation to the gable wall and a fair bit from the front and rear elevations. What long term implications will this have on my house? Will I need to get it professionally removed before the start of the build and reinstated at completion? Presumably next door will have also been done...how will this affect their house? I do have some background in the building industry, but from behind a desk and not from a point of view if the practibility if on site work! Thanks in advance of your advice/comments. 210409 - STRUCTURAL DRAWINGS -S2.pdf 210409 - STRUCTURAL DRAWINGS -S1.pdf