ᐅ Floor plan design for a passive single-family house – ground floor

Hello everyone,

For many years, I have been considering building a house, and last summer I found and immediately purchased a suitable plot of land.

This year, I want to build a house and have developed ideas and plans over the years that I have now adapted to fit this plot. I would like to hear independent opinions, criticism, and suggestions for improvement.

Let me start with the basic conditions:
Zoning plan / Restrictions
Plot size: 1210m² (13,020 sq ft)
Slope: slight incline of 1.5m (5 feet) over 20m (66 feet) from east to west
Floor area ratio: 0.1
Building envelope, building line and boundary: 10m (33 feet) setback from the street front, 15m (49 feet) from the southern boundary
Number of stories: Single story (WR I)
Roof type: no specification
Architectural style: no specification
Orientation: no specification
Maximum height / limits: no specification
General: Zoning plan from 1964, therefore Building Use Ordinance 1962 applies, Lower Saxony

Homeowner Requirements
Architectural style, roof type, building type: Modern / Bauhaus / Urban villa
Basement, stories: No basement, attic set back
Number of residents, age: 1 person, 34 years old; planning open for future family (up to 3-4 people)
Office: Home office, with option to convert later into a children's room
Guests per year: 5-10
Open or closed layout: Ground floor preferably open
Conservative or modern construction: Modern
Open kitchen, kitchen island: Open kitchen with breakfast bar/island unit
Number of dining seats: 4-6
Fireplace: Pellet stove connected to water heating for supplemental hot water
Balcony, roof terrace: Attic set back on south side with balcony/roof terrace
Garage, carport: Garage and tool shed/workshop attached directly to the east side

House Design
Who designed it: My own plans and drafts
What do you particularly like and why?: Cubic design, no sloping ceilings upstairs, large open-concept ground floor
Cost estimate from architect/planner: not yet available
Personal budget for the house including fixtures: still open
Preferred heating technology: Passive house standard with solar collectors, pellet stove (room air independent) for supplemental heating, heat distribution via underfloor heating and controlled ventilation with heat recovery

Why is the design the way it is now?: Details collected over several years from different floor plans and personal preferences, adapted to the orientation of the plot

What is the most important/basic question about the floor plan in 130 characters?
I would generally like to hear opinions on my floor plan. Things I might have overlooked, how it could be done differently or better, and general suggestions.

Thank you in advance
Niels from Hamburg

PS: It’s a pity you can’t change the title when editing the post; I’d like to fix the typo sooner or later 😀

Attached is another view showing how I imagine it from the outside, for clarification

This has nothing to do with a passive house in the first place.

You write that only one storey is allowed, but your plan shows two?

Single-story construction is allowed, meaning only one full floor is permitted, which should be fulfilled by the recessed top floor as far as I know. The upper floor should not count as a full floor.

So, well, the plans give the impression that the floors are the same size.

On the upper floor, the area for the "balcony/roof terrace" must of course be subtracted. To illustrate this, I have also included the southwest elevation view ;-)