Okaaay... that would be insanely cool. I'll take it to the architect! Thanks for the tip!
Works. Landesbauordnung für Baden-Württemberg (Building Code) from 8.8.1995 last amended by law of November 21, 2017 (GBl. p. 606) and Article 3 of the law of November 21, 2017 (GBl. p. 612) "§ 5 Distance areas … (6) When measuring the distance area, the following are disregarded 1. subordinate components such as cornices, roof overhangs, entrance and terrace canopies, if they do not protrude more than 1.5 m beyond the exterior wall 2. projections such as walls, bay windows, balconies, door and window projections, if they are not wider than 5 m, do not protrude more than 1.5 m and remain at least 2 m away from neighboring boundaries" I’m not sure if this allows you to effectively enlarge the building boundary within your property, but if so, you could add up to 7.5 m in the kitchen or dining room ;)