ᐅ Floor Plan of a Single-Family Home on a Sloped Site

Created on: 21 May 2025 21:23
J
John2122
Hello everyone!

I have been in the planning phase for our single-family house for some time now, but it is proving to be very difficult and complicated due to the characteristics of our plot.

Here is a brief description of our plot:
Orientation: South - North
Dimensions: 20m wide and 40m long (approx. 66 feet by 131 feet)
The access road is located on the south side. Therefore, our plot slopes upward about 3m (10 feet) from the south (access road) towards the north.
See attachment below:

Technical construction plan with site profile, red reference line and dimension details on property


We do not have a preferred layout for the floor plan of the single-family house. I am open to all ideas and would appreciate any suggestions or layouts that could help us realize our dream home. We have already considered all variants (basement & ground floor, ground floor & upper floor)…

What we want:
- Double garage and barrier-free access through a utility/mudroom into the house & a technical room for the building
- Basement / Ground floor:
Living room
Dining room
Kitchen & pantry/storage room
Office
Bathroom
Toilet
Entrance hall & cloakroom
Access to the next floor via stairs

- Ground floor / Upper floor:
Master bedroom
Child’s bedroom
Child’s bedroom
Child’s bedroom
Bathroom
Toilet

Roof type: Gable roof

South orientation is not a must, as we are not sun worshippers and summers are getting hotter. We want nice, open, and bright rooms, as well as a garden on both the south and north sides with small terraces.

I would be very grateful for your help, thoughts, and experiences, and I look forward to hearing from you!

Best regards from beautiful Austria!
H
hanghaus2023
22 May 2025 19:10
@K a t j a and @ypg that is a maximum slope of 8%. This can easily be leveled within the house area. Naturally, all this without retaining walls. However, if you want to level the entire plot completely, it becomes really expensive. The OP doesn't want that anyway.
K a t j a22 May 2025 19:38
hanghaus2023 schrieb:

@K a t j a and @ypg, that is a maximum slope of 8%. This can easily be leveled within the house area. Of course, all without retaining walls. But if you want to level the entire plot, that becomes quite expensive. However, that’s not what the OP wants.

Yes, I have already modeled the slope in my program. Still, I think it’s too much to create two terraces (north / south). The house itself, next to the garage, needs to extend quite deeply into the slope due to the limited plot width. Otherwise, you won’t fit all the rooms. So at least 11m (36 feet) of depth plus 3m (10 feet) terraces on each side means digging out 17m (56 feet) to achieve a level surface. That is a significant expense. We haven’t even discussed stairs or daylight access for the 3m (10 feet) terraces yet.

It would need to be checked whether the roof could possibly be expanded. For example, if an office and parents’ bedroom could be located there, the footprint could be reduced, and less excavation would be required. But having two terraces exactly on the north and south sides seems ambitious to me.

PS: The pictures are just to illustrate the height differences.
Gray flat-roof building with two wooden doors, freestanding in a green grassy yard with a fence.

Modern flat house with entrance on the left, double garage on the right, fenced plot on a green slope.

Floor plan from above: left room with door at the bottom, right extension room; purple walls.
K a t j a22 May 2025 19:46
The design from #5 picture 4 is not bad, but I think it is also extremely expensive. How many cubic meters of soil is that? Have you calculated it before?
H
hanghaus2023
22 May 2025 19:57
House 9 x 11 m (30 x 36 ft), garage 6 x 7 m (20 x 23 ft), north is at the top.


Site plan: blue main building, outbuilding, driveway, dimension lines.



Slope profile: red house with roof, small grey outbuilding, green and red terrain lines.


Driveway has a maximum slope of 10%.
K a t j a22 May 2025 20:08
hanghaus2023 schrieb:

House 9×11m (30×36 ft), garage 6×7m (20×23 ft), north is at the top.





Driveway has a maximum slope of 10%.

This is quite similar to #5 from the original poster. He now wants the garage directly attached to the house. But how should the excavation look? I assume it would be across the entire width of the plot. That’s quite a large raised bed filled with soil. In addition, rather than a fence, a retaining wall would practically be needed for most of the depth. Rainwater infiltration or drainage would have to be managed across the whole area. Considering the requirements for the house, I estimate the cost at around 800,000 or even more.
H
hanghaus2023
22 May 2025 20:29
The house and garage can also be set a bit higher, creating a mass balance. However, this would result in a driveway slope of around 15%.

The issue is the garage at ground level.

I have 3 steps leading to the garage, which I can just manage. Something like that would greatly ease the situation.