Project Homeownership - Basement, Ground Floor Plan - Tips

A basement / underground floor and two full stories are not mutually exclusive.

We have, classically, entrance, wardrobe, building services, WC, kitchen, living, dining, garden access downstairs.
Upstairs bathroom, sleeping, utility room, children's room.
Arifas arranged the rooms differently, also two full stories despite the slope.
Friends of ours again differently.
We just have a bit more of a slope.

Too much filling costs, excavation also costs.

1. You are allowed to build your desired house according to the development plan.
2. How steep is the slope within the building envelope? Regardless of whether with or without a basement, usually you want to have level access from kitchen, dining, and possibly living room to the terrace.
3. How much would need to be excavated to build a basement? Does your desired house still fit within the allowed height then?
4. How much would need to be filled to build on a slab foundation?
5. Offers
Filling, house on slab foundation with larger footprint
Excavation, basement, house with smaller footprint.
6. Does your room program fit the smaller footprint?

My "rule of thumb" is that for every 20 cm difference in height, 10% of the basement cost is incurred. If you build "no basement" but still have foundation walls at basement height, then you have practically built a basement filled with earth without interior walls and without basement windows. And that then costs just like a full basement without interior walls and without windows. Since both are relatively minor items, basically the same. So you can also officially build the basement and have storage space. And you might need the latter after all: only a few people are throwaway types. Those who are collectors and don't have a basement will eventually have both cars parked in front of the double garage. Nevertheless, according to the logic of my aforementioned rule of thumb, for a trivial slope location I would not build a basement.

My conclusion is: with a height difference (seen over the depth of the house) of less than 1m clearly no, from 2m clearly yes, and in between it is a question of honest self-assessment whether you are an eBay/flea market/throwaway type – or rather someone who leaves clearing out to their heirs.

I am not a fan of basements in clay soils; due to stagnant water, they must be constructed as a white tank and are therefore, in my opinion, expensive and unnecessary here, since storage space can be created in other ways, for example accessible via an attic. But then a shed roof is not possible. How to best position the house on the rather small plot should be worked through with your building supervisor. Don’t build too massive, in my opinion the land does not allow for a large house. That does not work. It looks cramped. And then build with aerated concrete, because this building material allows for monolithic construction without Styrofoam or insulation panels on the wall. It is not more expensive than others. K.

Do you mean slope over the entire property area or over the base area of the house?

Could you explain that to me a bit more precisely? I didn’t quite understand.