ᐅ First Draft Single-Family Home 150 m² with Basement

First Draft Single-Family House 150m² (1,615 ft²) with Basement
Requesting general comments, improvement suggestions, ideas, upstairs bathroom, etc.

Development Plan / Restrictions
Plot size 850m² (20x43m) (22,990 ft² (66x141 ft))
No slope
Site coverage ratio 0.35
Floor area ratio 0.60
Building lines and boundaries 3m (10 ft) west and south, 6m (20 ft) east
Edge development yes except east side
Number of parking spaces 2
Number of stories maximum two full floors
Roof type gable roof 22-48°, shed roof 8-20°
Architectural style no restriction
Orientation not specified, ridge direction only recommended
Maximum heights/limits maximum permitted building height 9.5m (31 ft), knee walls maximum 1.0m (3 ft)
Other requirements at least 2 parking spaces per residential unit

Client Requirements
Style, roof type, building type simple, no bay windows, two full floors, low-pitched gable roof
Basement and floors basement, ground floor, upper floor
Number of occupants, age 29 and 30 (2 children planned after house completion)
Room requirements on ground and upper floor
Ground floor: living/dining, kitchen, pantry, bathroom;
Upper floor: 2 children's rooms, master bedroom, bathroom
Office: family use or home office? for business, possibly home office 1 day per week in future
Guests per year 4-5
Open or closed layout open living/dining, otherwise rather closed
Conservative or modern construction mixed
Open kitchen, cooking island no
Number of dining seats 6-8
Fireplace yes
Music/stereo wall no
Balcony, roof terrace no
Garage, carport double garage
Vegetable garden, greenhouse no preference
Other wishes / special features / daily routine no preference

House Design
Planner: planner from a construction company who is also an architect
What do you particularly like? entrance situation, room arrangement, layout and dimensions of upper floor (except upper floor bathroom)
What do you not like? too close to neighboring building on south plot, upper floor bathroom, entrance planned as flat roof, door location in living room, other minor details
Cost estimate from architect/planner: not yet available
Personal price limit for house including equipment: not entirely clear yet but around 400,000
Preferred heating system: either gas (without energy efficiency funding) or ground source heat pump via horizontal collector or borehole (energy standard KfW 55)

If you have to give up, which details/extensions
-can be omitted: high-end finishes, walk-in closet, ground source heat pump, turnkey delivery
-cannot be omitted: stove/fireplace, office, two walk-in showers, double garage

Because our plot is relatively long and narrow (20x43m (66x141 ft)), we have already given some thought to the possible arrangement of the house and garage. Here is the thread on that topic.

At first, we focused on the first variant with the garage located above the house to the north. However, with the garage and house together, it would have become very tight toward the south. The architect's first draft surprised us (garage on the east) but we generally liked it very much, so we are now presenting this as the basis here. Many of our wishes have already been met, and the draft is definitely a good starting point. I have to add that currently we do not have any eastern sun exposure and do not consider this a problem. The only drawback is that the house stands relatively centrally and garden space is “wasted,” partly due to the 6m (20 ft) setback on the east. But we will submit a preliminary building inquiry to possibly reduce the distance to 3m (10 ft).

So, here are the plans. North is at the top of the plan.