ᐅ Detached Single-Family House on a Slope with a Granny Flat

Hello everyone,

So far, I have only been quietly following along, but now things are starting to get serious.

Together with my wife, we bought a 420 sqm (4520 sq ft) plot of land three years ago and would like to start building next year. It will be a single-family house with a granny flat, located near Aschaffenburg.
The architect came to our home today with the first draft. We definitely want to have a larger kitchen. This will be adjusted again before the next meeting.

I would also appreciate any advice you might have.

We plan to live on the ground floor and first floor.
The granny flat will be in the basement (with its own entrance).

Development plan / restrictions
Plot size: 420 sqm (4520 sq ft)
Slope: yes, about 2 meters (6.5 feet)
Building envelope: there is a building envelope
Number of parking spaces: 4
Number of floors: 2 full floors
Style: modern
Site coverage ratio: 0.35
Floor area ratio: 0.8

Client requirements

3 people: 30, 30, 1
Occasional overnight guests: mostly friends of the children
Modern construction style
1 garage
Fireplace (as a room divider between dining room and living room)
No open kitchen, but an island would be nice
Walk-in wardrobe + master bathroom
Office / guest room

Budget: 500 k

We originally wanted dormer windows, but the architect says they wouldn’t have a positive effect because the roof slope starts at a height of 2 meters (6.5 feet) in the attic.

My wife would like a gallery, but this is difficult because a bathroom for the two children is planned between their bedrooms upstairs. Does anyone perhaps have an idea?

House design
Planning by: architect

Thanks in advance.

Best regards

Kadir