go to a professional with the serious task
I haven't pointed out anything else, see "catastrophe". ;)
May I ask how your house is designed?
yes, but that doesn’t really help here.
Semi-detached house, (almost) square, practical, good with 8.95 x 9.50 m with staggered shed roof (15°/20°) on a slight slope. 130 m² living space ground floor/upper floor and basement 70 m², half of which is garage + workbench (old kitchen installed) + "material storage" (tools/paints/plaster/garden furniture/table tennis board/lawnmower/bicycles/tires/central vacuum/mini wood storage for fireplace), utility/technical room total 8.5 m² (access to garage), cellar 17 m², rest anteroom/stairs.
Ground floor: living/dining/kitchen and mini pantry with total 50 m² in L-shape, WC 2.5 m², office 6 m², rest corridor/hall/wardrobe/stairs with window.
Upper floor: 2 x children's rooms each 18 m² (1 children’s room additionally has 8 m² gallery floor accessible by space-saving stairs, the other children’s room is actually a guest room), 1 sleeping/dressing room 17 m², bathroom 7 m² (base area 9 m²), rest corridor/stairs.
Room heights basement/garage: 2.2 m, ground floor: 2.50 m, upper floor: children’s room sides 2.4 to 4.1 m, sleeping/bath side 1.7 m to 2.6 m
Balcony 28 m² (16 m² covered) at ground floor level.
And we don’t have too much space…