Floor plan optimization of a single-family house with a basement on a small plot

You are allowed 2 full floors and if I'm not completely mistaken, there is still enough room for a small knee wall in the attic. With your current house width, you have approximately 3m width with 2m plus standing height. Then take a look at knee wall cabinets. With some handyman skills, you can get a lot of storage space. The staircase must go all the way up. Who wants to climb a folding ladder anyway? You don't even carry suitcases and boxes up that way. The ceiling between the upper floor and attic is not insulated, but the rafters are. Disadvantages of the attic: - Appearance looks like a tower - Staircase headroom - different position, different staircase, dormer - Roof rafter insulation is more expensive than ceiling between upper floor/attic - More expensive from upper edge of basement (2 full floors, more roof) - Less usable space (although things can be stored under 1.5 m height) Advantages - No surprises with earthworks (they are always a box of surprises) - No risk of a white tank - No outside stairs - No light wells (gives the sqm for a shed) - No fall protection for light wells - Daylight - Can be expanded into living space if needed

That's true, Katja, but as I wrote, we find the living room in the BU floor plan too small, we would like a small kitchen and a more generous living/dining area (currently 32 sqm and that fits very well). Therefore, I didn't find Yvonne's suggestion of a narrower but longer house bad at all; the living area would be significantly larger there.

I don't think the approach is completely wrong either. However, a narrow long hallway.

Alternatively, an extension...

Hehe, that's already starting with the ground floor expansion.

I am quite sure that I wrote excluding furniture (including kitchen), since we have everything we need (currently 127 sqm living space) and that we can cover the additional costs for furniture separately.

You wrote that you already have furniture and kitchen. Man, we had that all too – or so we thought.
Let me list:
Curtains, sheers + rods, rugs, lamps, pictures + frames, doormats, bath mats, kitchen replanning. For us, things like an outdoor box for watering can & co, mailbox, doorbell + sign, outdoor lamps etc. were added – if I think a little longer, I'm sure more will come to mind.

Honestly, I don’t find it very nice to write that the budget only fits 2 children and that we should reconsider that. Everyone should still be able to decide for themselves how many children they want.

I don't agree at all. If I can’t afford 3 children, it would be better to have only 2. Or who is supposed to provide for your third child while you’re paying off the house?
But I’ll take one if it gets tight. I would still have space.

Variant with 3 m² more - otherwise it would have burst. Knee wall should be at least 1.30 m, otherwise the child with the long eaves will be upset. Double casement window in the closet and the child at the bottom of the plan you have to imagine. Chimney only exists if you drive an electric car.

An open kitchen is not desired, but a closed one without a dining area. Actually classic and conservative.

An open kitchen is not desired, but a closed one, however without a dining area. Actually classic and conservative.

That too!

I don't understand the problem with the basement at all. Everything can remain as planned, only the basement becomes the first floor and the dormer is left out on the attic floor. This also saves money, apart from earthworks, disposal, basement exterior stairs, waterproof concrete, and slope inclinations. Rooms can then be used as desired, e.g. guest room on the ground floor becomes a workshop (What works does the gentleman accomplish?). As for the development plan, many things are unclear to me. 1. Edge development not allowed: I can't believe that he excludes garages or carports on the boundary even within the buildable area. Since you don't want those anyway, at least a shed (not a workshop - at least not officially) could be placed in the boundary distance. 2. Green strip in front of the house: It's hard to believe that this strip, designated as residential building land, is to remain third-party property. Your property wouldn't even be adjacent to a public traffic area. 3. Ridge direction: Nothing can be seen about this in the drawing. Where is this set? If the development plan is to be adopted at the next council meeting, there will likely be no fundamental changes to the published draft. The planning law is probably locked down. Is there already a notary contract (draft) for the property?