Construction of a 144 sqm bungalow in Fichtenwalde (near Potsdam)

I haven't read everything in detail, but have you already furnished the living room? It gets pretty tight and the table feels like it's in the hallway and somewhat awkwardly in front of the window.

Thanks for the suggestion. We have already furnished the room. Since there are three of us, the table will be about 1.60m - 1.80m and the couch about 2.4m x 1.80m. We have placed all our furniture that we are bringing along. Everything fit very well. Sure, it won't be super spacious, but we didn't want that either, otherwise, we would have built much bigger. Our attitude is: "We build for ourselves and not for others" :)

Now, to be honest, I'm surprised that it doesn't "fit very well" after all. ;) With my sketch, I had already tried to illustrate that to you back then. Regarding your question: Yes, I would paint the terrace and integrate it into the living room. AND I would then definitely give the living room even more window area on the left side. Do yourself a favor and draw your furniture into the now larger living room and see where you look against the wall and where a window could fit. Windows are always great by the dining table.

a) we are more likely to choose a 1.60m * 0.80m extendable table, as we eat as a group of three in 95% of cases.

If we do not receive a kfw 55 subsidy due to the change, then that will no longer apply.

I would rather say that energetically you are better off without the terrace, since the window is then no longer shaded by the roof and that is (partly) the south side, right? I don't think you need a completely new building permit, but definitely a modification, since you don't just want to move a window and the volume etc. will change.