Floor plan design of a basement bungalow with a granny flat

Development plan/restrictions
Size of the plot: 795sqm
Slope: yes, from the street side to the end of the plot approx. 5m, see development plan
Floor area ratio: 0.35
Floor space index
Building window, building line and boundary
Border development
Number of parking spaces: 2 per residential unit
Number of storeys
Roof shape: gable roof, shed roof, hipped roof
Style direction
Orientation
Maximum heights/limits: wall height 635.10m above sea level, ridge height 637.40m above sea level
Further specifications

Requirements of the builders
Style direction, roof shape, building type: modern, hipped roof or gable roof (preferably hipped roof but will be a price question)
Basement, storeys (2 storeys, basement room and granny flat)
Number of persons, age (5, 3 children: 1 year, 4 years and 13 years. Father 40, mother 30)
Space requirement on ground floor, upper floor (145sqm)
Office: family use or home office?
Overnight guests per year
Open or closed architecture
Conservative or modern construction style: modern
Open kitchen, kitchen island: open
Number of dining seats
Fireplace
Music/stereo wall
Balcony, roof terrace
Garage, carport: carport double garage
Utility garden, greenhouse
Further wishes/special features/daily routine, gladly also reasons why this or that should or shouldn’t be

House design
Who created the design: architect
- planner of a construction company
- architect
- do-it-yourself
What do you particularly like? Why? single-storey bungalow, south orientation, generous distance to neighbour
What do you not like? Why? plot relatively narrow on the street side, does not allow much room for manoeuvre
Price estimate according to architect/planner approx.: 450,000 - 465,000 € excluding land
Personal price limit for the house, including fittings: 440,000 €
Preferred heating technology: gas with solar

If you have to do without, which details/extras
- can you do without: carport, room size
- cannot do without:

Why did the design turn out the way it is now? e.g.
Standard design from planner? No, plot-dependent
Which wishes were implemented by the architect?
A mixture of many examples from various magazines...
What makes it particularly good or bad in your eyes?

Hello everyone, I would be interested in your opinion on our floor plan. What could perhaps be done better.
Especially regarding the granny flat, what do you think of the layout? Does it make sense to plan perhaps one more room.
The granny flat is intended to help us reduce the monthly costs a bit.

Thanks in advance.

Hello Sambori, I have a few questions about the concept:

why plan a "single-story" bungalow when you enter the house through the basement?

why build an expensive granny flat when the goal is to reduce costs?

who is supposed to live in the granny flat? One room for everything except showering, but a large storage room. And with a ceiling height of 2.30 meters.

Why are you working on this floor plan if your price limit was already exceeded in the first estimate (!)?

About the floor plan itself: I find it terribly cramped because everything is squeezed onto one level. All bedrooms open off the living room, no one has privacy. And if guests are there, no one can sleep quietly. Sorry, but I think I would start right from the beginning. Cancel the granny flat, move some living spaces to the basement (e.g. the children's bedrooms) and shrink the house a bit.

A granny flat is financially worthwhile in very few cases. Normally, you build a house to have your peace. And then you voluntarily invite other people into the house who, in the worst case, make your life a living hell? That would not be for me.

Hello Pinky0301,

It also always depends on the property. And I think it makes sense here, as there are no contact points with the [Einlieger].
We have the garden entirely to ourselves. And you choose the people you bring into the house.

But I don’t want to distract from the topic now because my question was different.

The [Einliegerwohnung] will mainly increase your costs instead of lowering them. A discussion about a house that already exceeds the budget is quite pointless.

So I will do a lot myself, which the architect did not include or deduct in his cost estimate.