The extension should therefore only be built on the ground floor (is probably cheaper?), gable-side in front of the current living room and half of the kitchen. Two rooms are to be created - one of them possibly also usable as a somewhat larger living room. The other and the current living room are then to serve as bedroom/children's rooms. Electrical and heating installations must of course be laid, but no water. Simple flat roof - possibly also a small exit as a balcony/terrace. What would that cost extra? What costs would a basement estimate? I understand that only rough price ranges can be given, but even those would be helpful. What time frame can be expected? Oh yes, the house has a chimney pipe (sheet metal or whatever), which has to be relocated. What should be estimated for that approximately? Any answer helps! Thank you.