My question about building a new KfW 55 or better house: What exactly does it mean? Yesterday, I spoke with the managing director of a public construction company, and he advised me not to build a KfW house.
a) You would need a building supervisor (who is also specialized in this field).
b) If you insulate the house well, etc., the additional costs are low.
Furthermore, he recommended using a gas boiler + solar including battery instead of an air-to-water heat pump + solar including battery. The initial costs are much lower, and you will never recover the higher acquisition costs.
I am a bit confused. I originally planned to build at least a KfW 55 house.
For your information, our plot is fully developed, and a gas connection is available.
a) You would need a building supervisor (who is also specialized in this field).
b) If you insulate the house well, etc., the additional costs are low.
Furthermore, he recommended using a gas boiler + solar including battery instead of an air-to-water heat pump + solar including battery. The initial costs are much lower, and you will never recover the higher acquisition costs.
I am a bit confused. I originally planned to build at least a KfW 55 house.
For your information, our plot is fully developed, and a gas connection is available.
K
knalltüte27 Jun 2020 19:44MayrCh schrieb:
...Aha. Then prove your claim that building to KfW 55 standards is cheaper than complying with the Energy Saving Ordinance with actual figures. Even KfW itself mentions about 10% higher costs. By the way, I can confirm this approximate amount, as I requested quotes for my building project as KfW 70 (Energy Saving Ordinance), KfW 55, and KfW 40. Ahh, that interests me a lot! We are deciding here based on a gut feeling.
What were the actual numbers (differences), and according to which standard did you build?
@MayrCh
ISE:
...approximately 0.3 percentage points per year on average values of around 17.5% [ISE10] and peak values of 22%.
The evidence is further up with several current projects.
Specific figures are also provided there.
Since you have been quoted a KfW70 house,
you are referring to the old KfW conditions regarding the 10%.
It is well known that additional insulation is often sold at a high price, even though this only concerns the insulation material itself.
ISE:
...approximately 0.3 percentage points per year on average values of around 17.5% [ISE10] and peak values of 22%.
The evidence is further up with several current projects.
Specific figures are also provided there.
Since you have been quoted a KfW70 house,
you are referring to the old KfW conditions regarding the 10%.
It is well known that additional insulation is often sold at a high price, even though this only concerns the insulation material itself.
superzapp schrieb:
Ah, this really interests me! We're deciding here based on intuition.
What were the results in numbers (differences), and according to which standard did you build? Missed the mention.
The additional cost from KfW 70 to KfW 55 was about 5%, I think around €15,000 (about $16,000) at the time. For roughly €100 ($110) annual heating cost savings. This would have only paid off thanks to subsidies (which we all contribute to). So, in my specific case, I consider it neither economically nor financially reasonable.
KfW 40 would have then been more than 10% higher.
Old standards with the old subsidies that are no longer available are not comparable to current projects.
A comparison of construction costs is out of the question, especially since price increases are currently too high. A single change of the year can already cause a 10% increase, according to BKI.
A comparison of construction costs is out of the question, especially since price increases are currently too high. A single change of the year can already cause a 10% increase, according to BKI.
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