Floor plan design of a 145 sqm single-family house on a slope

Hello,

we have two plots of land near Vienna. We plan to build on the northern plot, the southwestern plot will be kept as a garden and will not be developed. The plots are located on a gently sloping hillside. The access road is very quiet and leads to 10 other houses before it turns into a forest road.

We plan a single-family house with approx. 145m2 of living space and the possibility to expand this in a further step by converting the half-basement if more space is needed. It is important to us to have a cost- and energy-efficient construction method without bay windows, excessively high ceilings, etc.

Development plan/restrictions
The plot is located in Lower Austria near Vienna.
Plot size – 739 m2, the southern plot with 643m2 also belongs to us and will be used as a garden (not built over)
Slope – yes – approx. 270 cm (see attached detailed plan, the official elevation plan is currently being created)
Floor area ratio – 25% of the plot area and 10% of the plot area for ancillary buildings
Floor space index – does not exist
Building window, building line and boundary - Half the building height, but at least 3m building setback front, rear and on the sides of the plot, only ancillary buildings (garage, carport, shed…) may be erected in the building setback / In open development, a lateral building setback of ancillary buildings must be kept free
Edge development - Ancillary buildings may have up to 100m2 footprint (total) and a height of 3m (on a sloping site, this height may be exceeded downhill)
Number of parking spaces – 2 parking spaces / plot access – max. 7m width / carport and garage in the front building setback with a minimum distance of 1m to the street / depth of garage and carport max. 12m / street-side front of carport and garage max. 7m
Number of floors - max. 2 floors + basement
Roof shape – no specification
Style – no specification
Orientation – no specification
Maximum heights/limits – 9m at the highest point, or max. 8m average per side (measured from existing level)
Further requirements It is possible that we will have to cede approx. 55cm to the municipality on the street side.

Client requirements
Style, roof shape, building type preferably rectangular and energy-efficient (no bay windows etc.)
Basement, floors – 2 floors plus habitable basement
Number of persons, age – 3 persons (41, 39, 1)
Room requirements on ground floor, upper floor – Ground floor – entrance, wardrobe, kitchen, living/dining room, office/guest room, upper floor 2 children's rooms, bathroom, WC, utility room, master bedroom – For your information: The garden shed shown in the overview is existing.
Office: Family use or home office? Home office
Overnight guests per year 4x 2 persons each
Open or closed architecture closed
Conservative or modern construction conservative
Open kitchen, cooking island no open kitchen
Number of dining seats – at least 8 normally, up to 14 when guests
Fireplace – initially considered, but we have not been able to agree on a fireplace so far (3 viewing windows and low heat output…) - opinions differ here
Music/stereo wall no
Balcony, roof terrace no
Garage, carport carport for one car and garage for a second car
Kitchen garden, greenhouse yes in the future
Further wishes/special features/daily routine, also reasons why this or that should or should not be

House design
By whom is the planning:
- Do-it-Yourself

What do you particularly like? Why?

Upper floor

[*]Bathroom/WC separate
[*]Separate utility room for washing/drying laundry (because drain in basement only possible with a pump and washing can be done where it occurs)
[*]WC and utility room not adjacent to rooms, therefore less noise disturbance
[*]All rooms are the same size (at least 16m2) – rooms can be swapped
[*]Children's rooms facing south
[*]Master bedroom facing east to be woken by the sun.

Ground floor

[*]No open kitchen, but with a view of the dining table when the door is open
[*]Living and dining room not separated
[*]Living room with view over the west garden
[*]Dining room facing south and exit to the garden (right next to the kitchen)

Basement

[*]Opportunity to expand, protected location towards the garden
[*]Exit to west terrace

What do you not like? Why?

Upper floor

[*]Access to utility room through bathroom

Ground floor

[*]Window in office facing carport

Price estimate according to architect/planner: 400,000 EUR (for the house including garage, carport, terrace and fence on the street side)
Personal price limit for the house, including equipment:
Preferred heating technology: Heat pump (surface collectors)

If you have to do without, which details/extensions can you do without:

[*]Garage, fireplace

You cannot do without:

[*]Separated kitchen
[*]Separate bathroom/WC on the upper floor
[*]Utility room on the upper floor
[*]Office/guest room

Why is the design the way it is now?
The plot has a slope, so the habitable basement is recommended so that the house entrance (ground floor) is at street level.
Due to the height difference and the narrow width of the plot, the gable roof with a knee wall of 2.2m was planned to increase the building width and still comply with the setback (half the building height).
Since there is no neighboring plot to the west and thus an unobstructed view is guaranteed, we placed the living room to the west (the basement is accessible from the garden on the west, which means the living room has no garden access). The dining room/kitchen is located to the south, as the garden is accessible at ground level here. From the kitchen you have a view of the south garden and can keep an eye on the children and go directly to the outdoor dining area.
The garage access is located halfway between the basement and ground floor and is connected to the house by a door.
The office serves as a retreat.

In the habitable basement, the illuminated part can be expanded in the future to a fitness area/guest room/office or possibly an additional children's room, or the third room on the upper floor can be used as a children's room and the master area moved to the habitable basement... Since the backwater level of the sewage pipe is at street level and the sewer does not run below the basement level, no sewage pipes are planned in the basement so that no lifting device for sewage is needed.

On the upper floor, we placed value on the three rooms of equal size with at least 16m2, so they can be swapped and for example also be used as an office/guest room instead of a children's room. Since we currently have the toilet separate from the bathroom and this is very practical, we have implemented this in the house as well. The utility room will be mainly used for washing laundry and storage of cleaning utensils (ironing is done in the living room) and has the advantage that laundry piles can be hidden behind a door. Neither the toilet nor the utility room is adjacent to a room (noise disturbance) and no water pipes are planned in the wall towards the children's room.

Corresponding/which wishes were implemented by the architect? n/a

What makes it particularly good or bad in your opinion?
The slope of the site was well incorporated into the design due to the habitable basement. Despite the narrow plot, a good house width could be achieved.

After weighing our requirements and wishes, the most important elements could be implemented.

What is the most important/basic question about the floor plan summarized in 130 characters?
We ask you for your opinion on our floor plan? Please include constructive improvement suggestions.

Here are the additional files

Outside: I don't like suffering, especially not from the west, as it is very awkward there. Since land is not scarce, I would rather build a corner bungalow with a living basement because of the slope. Inside: The room layout is great. The kitchen could possibly be a bit wider, for a small table for a quick breakfast. The living room is nice, and I also like that the TV doesn’t dominate everything but has to content itself with whatever is left, which I find sympathetic. I really like the upper floor because of the bathroom with a sauna and separate toilet. That is definitely luxury, but if you can afford it, more power to you. It is nice. K..

The way to the kitchen is long, everything has to be carried through the living room, better still another door to the kitchen.

The rest I find okay as a quick sketch.

Exterior views well, try it with a maximum of 2 window formats and then align them as much as possible above each other.

Check the exact measurements of the bedroom and office

Office 2.5 m depth - 1 m door leaves 1.5 m for table, chair, and movement space
The distance from the edge of the table to the wall should be at least 1 m, for you more like 80 cm

Bedroom the same
4.5 m - 0.7 m wardrobe row - 0.8 m distance (too little, you can't even take a step back to see if your favorite sweater is at the top of the wardrobe) - 0.5 for dressers leaves 2.5 m for bed with frame and yes what about the remaining 30-40 cm between the bed and the wall?

Unfortunately, quite a few things don't fit. The room doors here have an RBM of 80cm, but 90cm is needed for a width of 86cm. I'm not even going to talk about the 70s doors. Toilet next to the washbasin, that just doesn't work at all if you enlarge the washbasin to a usable size. I roughly looked at the other measurements: everything looks much bigger if you keep the doors small. The 3.50 living space width doesn't even accommodate a drawn 4-seater! Our sofa as a 3-seater has generous dimensions of just under 3 meters, but nowadays chill furniture has precisely those kinds of measurements – with your sofa you are convincing yourself of more space than actually exists. The bedroom as planned is also not exactly what you'd want, especially without a passage at the foot end. Toilet without a window is possible, but only a last resort. I would avoid drainage in the middle of the house and past the couch.