Semi-detached house feasibility assessment ideas notes

If I now subtract the stair areas and hallways, I have to do that for the apartment as well, right? Or are hallways considered living space in an apartment but not in the house?

Yes, hallways are generally counted as living space. However, in the house, you have a hallway three times instead of the usual one time in the apartment. And in your drawings, you are making the mistake of assigning the stairwell area to the hallway and then to the floor. When I then add the area of the individual rooms, I come to about 46 m2 for the upper floor. The ground floor should be roughly the same but minus the utility room (it is often added to the living space, but in your size it is de facto only a technical annex with a living value close to zero). Then there is a built-in cupboard under the stairs. So, with some effort, that makes 90 for the two floors. The wild card is the attic. Would you have another 20 to 25 thousand for a partial basement? Glatthaar, for example, sells such a basement module with about 5x5 meters. Something like that with a utility room, laundry room in the hallway, and a small office with a sloped ceiling would massively ease the situation. You don’t have to finish it right away.

And you make the mistake in your drawings of assigning the stairwell area mathematically to the hallway and then to the floor. When I then add up the area of the individual rooms, I come to about 46 m2 for the upper floor. On the ground floor it should be roughly the same but minus HAR (which is often also added to the living area but in your size is de facto only a technical appendage with a living value close to 0). In addition, there is a built-in wardrobe under the stairs. So, with great difficulty, that makes 90 for the two floors. The joker is the roof.

in the drawings, yes. But in the last calculation I deducted everything disputable. It is practically a net net living area calculation. And then it turns out that we are not getting worse (in terms of living space).

But the absolutely nonexistent storage space is a deal breaker.

yes, that is where the problem lies. Not even 4m^3 is nothing. Are there weatherproof sheds?

Would you still have 20 to 25 TE for a partial basement? Glatthaar, for example, sells such a basement module with about 5x5 meters. Something like that with HAR, laundry room in the hallway, and a small study with a sloping ceiling would massively ease the situation. You don’t have to finish it right away.

Maybe, but will that remain the case? Won’t construction costs (earthworks) also increase? And won’t the other builder have to go along with it? Be that as it may, I can’t decide that freely, it depends on the developer...

I thank you all for your urgent warnings, but the fact remains that there are few alternatives here in the area. We have also looked at existing properties, but with renovations calculated in, these are often even more expensive. We still have a plot of land in mind with free planning, but it is questionable whether we will get it, since there are already a lot of interested parties.

Best regards
Tolentino

That makes 24.4 m² per person.
If I calculate with the house having 125 m² of pure living space, then it's 25 m² per person.

Those are just numbers.
And structural dimensions in the townhouse. Everything in the apartment is already plastered.

Those are all just numbers. And raw building measurements in the DH. In the apartment, everything is already plastered.

yes, sorry, I don't capture anything intangible like that. It's my profession. What do you lose because of plaster?

But don't I need a bigger storage then? Won't it just consume everything again?

We had a gas boiler with an instantaneous water heater in our old terraced house. I don't think it gets any more space-saving than that. If every centimeter counts, that's not the worst solution. The thing would even fit into the storage space in the attic that I planned for you as an alternative.

What do you lose because of plaster?

1 to 3%. It's just a question whether you have shell dimensions or clear dimensions.

But since you drew the plans yourself, you can't really say exactly how thick the interior walls will be - you don't even know yet what will be masonry or drywall and what the structural engineer prescribes. Otherwise, as a rough estimate, calculate 11 cm plus 1.5 cm plaster for non-load-bearing partition walls, thus 14 cm total thickness, as well as 17 plus plaster = 19 cm (plastered on one side) or 21 cm (plastered on both sides) for load-bearing and exterior walls.