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Home for good

We have a bach on the Thames Coast which is single level.We want to go up another level, and put 2 rooms, a living room and a bathroom/toilet up there. We would like a balcony from one of the rooms, and a BBQ area on top of what will be a shed/garage converted in to a decent sized garage. A deck at ground level and double-glazed/bi-folds on the fronts of the house.