Floor plan optimization 175 sqm bungalow on 579 sqm plot

Hello everyone,

we have purchased a plot of land and are now considering how to sensibly build on it with a bungalow meeting Kfw 40+ standard. We have attached an initial floor plan. Currently, we plan to place the bungalow with a 3m distance to the left neighbor within the building window and later build a double carport on the left side. The terrace is also planned to be built on the west and north sides.

Development plan/restrictions
Size of the plot: 579 sqm
Slope: no
Building window, building line and boundary: Single-story the house may be up to 175 sqm, two-story up to 150 sqm may be built over. Building window 23m wide by 14m deep. 3m distance to the left and right, carport / garage may be built on the boundary. House in this design planned at 14m x 12.5m.
Edge development: no
Number of parking spaces: 2
Number of floors: 1
Roof type: hipped roof
Style direction
Orientation: garden to the north
Maximum heights/limits
Further specifications

Requirements of the builders
Style, roof type, building type: bungalow
Basement, floors: no basement, ground floor, attic may possibly be converted later
Number of persons, age: currently 2 adults (33 and 30), one baby, another child possible
Space requirement in GF, UF: GF 175 sqm including approx. 32 sqm granny flat, UF may be converted later, hence the stairs
Office: family use or home office?: home office
Overnight guests per year: overnight guests will be accommodated in the granny flat, otherwise vacation rental
Open or closed architecture: open
Conservative or modern construction: modern, although the bungalow is probably rather conservative
Open kitchen, kitchen island: yes, planned
Number of dining seats: 6
Fireplace: no
Music/stereo wall: no
Balcony, roof terrace: no
Garage, carport: double carport later
Utility garden, greenhouse: no
Further wishes/special features/daily routine, also reasons why this or that should or should not be: granny flat is intended for vacation rental, open design with open kitchen / living / dining desired.

House design
Who designed it: ourselves
What do you like in particular? Why?: the open design of kitchen / dining / living and the separation of private rooms
What do you not like? Why? bathroom of granny flat has no window, private rooms are cramped
Price estimate according to architect/planner: approx. 425,000 EUR excluding floor and painting work
Personal price limit for the house, incl. equipment: 470,000 EUR
Preferred heating technology: air heat pump

If you have to give up, on which details/extensions
-you can do without:
-you cannot do without: granny flat, open design

Why is the design as it is now? for example
Our own (limited) creativity.

What is the most important/basic question regarding the floor plan in 130 characters?
How can we design the rooms so that they are not cramped, still have all windows, and kitchen / living / dining are open?

We look forward to your input and ideas. The floor plan currently reflects only our idea and has not yet been planned to the centimeter. The dimensions serve as a rough guide.

Draw some furniture in realistic size. From my point of view, too many wishes on this area!

hm, one gets lost, the other has no space.
For example, the dining area gets lost, while (for example) the bedroom is not furnishable.
It is dark in the middle.
Try furnishing it yourself to scale.
The guest WC is smaller than the bathroom of the [Einliegerwohnung] and roughly the same size as the bedroom…
With a normal ceiling height, the staircase must be at least 3.70 meters long. Right now there is barely an emergency staircase drawn in.
If child 2 comes, where will the home office go then?

With an almost square floor plan, there are areas that do not get windows. Either you achieve brightness through a creative roof and here through a third gable or skylights, or you should aim for a different house shape.

Does it have to be the [Einliegerwohnung]? Is this a holiday paradise for couples and singles for you, where there is traffic and it pays off?

Once the exterior and interior walls are drawn with the correct thickness, nothing fits anymore. In the bedroom row, there are too many narrow rooms that hardly allow any loss of space.

No offense, but I find it quite unprofessional that anyone even gave you a price for the drawing.

Nothing personal, but I find it pretty unprofessional that someone even gave you a price for the drawing.

The price is determined by saying: the house has 175 sqm, it should be a bungalow with a hip roof. Then the builder's calculator does the math: It assumes 170 sqm, takes its flat rate of €2500/sqm for a single-family house, and out comes ... tadaa €425,000 :) In my opinion, it is not a bungalow plot.

175 sqm of floor space are max. 140 sqm of living space, minus 30 sqm for the [Einliegerwohnung], leaving 110 sqm for you.

Living directly at the entrance, mini-wardrobe/utility room, no storage space…

Some sqm are missing.

Please draw walls that deserve the name. Furniture has already been mentioned.

Please also draw the terrace/parking space/house entrance etc.