Cost planning

Additional costs of €40,000 => does that include paving work and garden?

No, those come on top.

Additional costs of €40,000 => does that include paving work and garden?

Has anyone already calculated if and when the additional costs for the KfW55 or 40 house pay off? I would say with ~80% loan-to-value and ~20 years financing.

I would like to refer you again to #2, so you know what incidental construction costs include. Bauexperte also pointed out the search function.

Has anyone ever calculated if and when the additional costs for the KfW55 or 40 house pay off? I’d say with ~80% financing and ~20 years of loan term.

Yes.

My bank.

Me too.

Back then KFW70 (= today Energy Saving Ordinance 100) to KFW-55: Savings about 10 euros/month.
Capital investment: about 15,000 euros.

Payback: No foreseeable, reasonable timeframes.

Very very very rough rule of thumb:
Each level costs about 10-15k more. Just as a reference.

OK: Our house was built and designed to be already very close to KFW-55. But the hurdle could only be overcome with the above-mentioned investment. So the above 10 euros are relativized to ........ 2 or 3 euros/month?

You don’t build a higher standard to save money. Even KFW70/Energy Saving Ordinance 100 costs almost nothing anymore in terms of heating and hot water, it gets lost in the noise.

You do it with a high standard because you *want* to AND *can* (financially). Wanted: I would have. Could: I couldn’t.

Best regards
Thorsten

PS: The winter wasn’t that cold, but it was long. I heat with gas (also hot water, including thermal solar with about 50% annual coverage), slightly with wood (negligible). Calculated on gas, it was 55/month. The utility company now wanted to lower me to 40/month based on recently read consumption. Let’s say: 55/month is the baseline, this is zero. Here you see what you can still save. 50-70 euros. For that, you have then a 40+ with a thick solar system, certainly also a thermal solar system, insulation to the extreme, and so on. Or a not properly functioning passive house or solar house. Pipe dreams in my opinion. Certainly costs 50k+ compared to Energy Saving Ordinance 100. For the savings, you don’t get the necessary funds financed for the next level from 100 -->55.........

Hash: search function //

Yesterday I was at the civil engineer whom I will probably be building with. According to him, I would be at 1300-1400 € / m² or 300 € / m³ in standard construction, i.e. Energy Saving Ordinance 2016 with gas.

Question 1: How much does a geothermal heat pump with 2 deep drillings more cost me? Does the heat pump cost about the same as a gas boiler and I only pay the drilling(s) as an extra charge??

KfW55 +15,000€ he said is about right. Here I would still get 5,000€ gifted by the KfW bank and the cheaper loan, which according to my calculation is another 5,800€. So effective additional costs of only 4,200€ + costs from question 1.

KfW40+ would be an additional 30,000€ more and "only" 10,000€ gifted by the KfW bank = 20,000€ more. For that I would rather build the double garage.

Or is 15,000€ set too high for a photovoltaic system with storage?

Maybe it also makes sense to do KfW55 with photovoltaic system + storage. Then I would be at 0.0 gas and hopefully 0.0 electricity costs.

Question1: What does a geothermal heat pump with 2 deep drillings more cost me? Does the heat pump cost about the same as a gas boiler and I only pay the drilling(s) as an extra charge??

Hard to say, as the figures vary greatly depending on the region and soil conditions and of course how deep you have to go. You should also first clarify whether this is even possible or allowed in your area. Here, a meter costs about 70 euros, but at least 180 meters would have to be drilled. So relatively expensive, which is why I tend to prefer a trench collector.