City villa floor plan 180m², basement, 3 children - Your opinions on this?

We will adapt to a width of 230 and a depth of 230.

Then the whole floor plan idea is pointless.. a lot will change.
If you go for 2.30 width, also consider 2.50 for the entire staircase niche (with a ceiling height of 2.50)... it's better.

A one-sided shelf with 15 cm depth is sufficient there.

That will be a rather expensive room: estimated 4 sqm at 2000/sqm... 8000€, where shelves can’t even hold a baking tray. Do you really want such a “hamster cage”?

The study is located in the attic.

Wow, you’re planning 4! floors... 3 of them heated.
If you still have to raise the basement, and the attic gets 80cm KS, that will be a rather tall house. A little tower.

We are building in NRW and are contributing a lot of our own work, including the following:
- Masonry of all exterior and interior walls with 2 friends
- Installation of the ring trench collector
- Installation of underfloor heating including insulation but without screed
- Installation of ventilation ducts for the ventilation system
- Chasing and laying the electrical and bus cables for KNX
- Installation of all floor coverings

Respect or madness.
I don’t think this will cover the budget shortfall. The house construction will be prolonged and the standby interest will have to be paid.
You are currently planning an expensive usable basement and a more expensive tent roof than the common city villa roofs so that the attic can even be used.

Since you have to plan anew anyway and should remember that corridors shaped like hoses are neither nice nor functional, and towers are not exactly attractive nowadays, you should consider reshuffling the house or the rooms.

That sounds utopian at first, but others also have ambitious goals ( with his 1200€/m² house).

Great that my assessment of the heat pump + ring trench collector fits. The Nibe (under 10K online, usually around 11-12K from the plumber) was our first choice, but on the recommendation of our energy consultant it will now be an Alpha Innotec (same parent company). I assume you are going with the smallest Nibe with 7KW?

By the way, Nibe says that the controlled residential ventilation from their own house runs together with the heat pump and that is why both are eligible for BAFA funding. If there is still BAFA funding for heat pumps?

According to which energy standard do you want to build?

Are the costs before or after deduction of the subsidy(ies)?

How high do you estimate your own contribution? 100K is realistically very hard to achieve (but not impossible) In our building area, a building couple (building community of man and woman) built the semi-detached house almost entirely themselves. From the BP, masonry over the ceiling to laying electrical cables. But that took quite a while (6-7?) months and they were often but not always there full-time.

Do you and your friends have that much time?

We would have needed about 600 meters of drilling (620 sqm underfloor heating = semi-detached house with heated basement). Only 60 to a maximum of 70 meters drilling depth would have been approved. So 9 - 10 boreholes and that would be so expensive. My two forthcoming air heat pumps with storage and installation cost 52,000 €. Compared to that, the 16,000 € sounds very, very cheap.

Crazy :rolleyes:. I think people often go way over the top. What was the calculated heat demand of the house? Our semi-detached house with about 300 sqm of actual living space requires 5.3 kW with passive house standard! So the smallest heat pump under 7 kW would have been enough for the whole house. But then a separate (hot water) storage tank would have been necessary. I consider the configuration of the OP to be significantly more realistic.

That confuses me a bit now. We are getting 2 air-water heat pumps each 14 kW and 2x 360 l heat pump storage tanks. Not a low-energy or passive house, but 36.5 Poroton, without insulation.

Yes, you are certainly right, with a general contractor (GU/GÜ) these requirements are definitely not achievable within the budget. We are building in NRW and doing a lot of work ourselves, including the following: - Building the entire exterior and interior walls with 2 friends - Installing the ring trench collector - Installing the underfloor heating including insulation but without screed - Installing the ventilation pipes for the ventilation system - Chasing and laying the electrical and bus cables for KNX - Laying all floor coverings

What are you and the friends by profession? Are you from the construction industry? It’s no coincidence that there is a master craftsman requirement for various professions in the construction industry and my general contractor is by profession a butcher, and that’s no joke. I just didn’t know that until recently, but now I see the consequences. At the moment we are tearing down the entire drywall of 2 semi-detached houses again because the vapor barrier was glued incorrectly. 400 sqm of drywall surface and everything double-layered. The other side of this enormous amount of planned own work is that your wife will thank you when you are only on the construction site and she is constantly alone with then 3 small children. Think carefully about this scope again. I consider it unrealistic.

So, let me summarize:

You want to build a 10 x 10 m² house with two full floors, a basement, and a finished attic, with a ground source heat pump, KNX, and probably some other "must-haves"? No way will you manage that for 400 K (or even 415 K) including everything, labor contribution or not. My opinion. As already pointed out: a six-figure sum is missing. Of course, if you budget another 200 K for additional costs, the situation looks different again. ;)