KfW - construction: is it necessary or not?

2020-06-26 15:32:02

Thus, the final energy demand of a new building according to the Building Energy Act is between 45 and 60 kilowatt hours per square meter of usable floor space

That's not a big deal.

2020-06-26 15:42:08

It was never really about passive houses; all KfW houses are active houses. The KfW70 has already been dropped in the new building subsidy. Eventually, the KfW55 might follow. But here it is exactly about the comparison. Although it is still a question today according to which DIN the energy saving ordinance is actually calculated. We saw that when we switched to DIN 18599.

2020-06-26 16:11:09

because a KfW55 house is simply cheaper to build than an Energy Saving Ordinance house

This statement is as new to me as it is exciting. Despite additional structural thermal insulation, more energy-efficient system technology, and professional support, a KfW building is supposed to be cheaper than an Energy Saving Ordinance building?

2020-06-26 16:55:47

I assume that the majority build the houses in order not to move out again immediately. Does anyone seriously believe that if the house is ever sold in the year 2052, anyone will still know the classification as a KFW 85, 70, 55, or 40 house? Even if you look at the current used real estate market and find a not too old house from the 2000s, I hardly believe that a classification as KFW 100, KFW 85, or KFW 70 makes much of a difference in price. People are just glad to have gotten a young used property at all; location, supply, and demand determine the price. I believe the resale value is a completely overrated argument.

2020-06-26 17:10:19

Once again interesting to see the influence politics has on facts
and how it leads to completely nonsensical claims, like gas being similar to an air-to-water heat pump.

Every air-to-water heat pump failed up to the Energy Saving Ordinance 2014. Only when politics decided to simply raise the actual primary energy factor politically did air-to-water heat pumps become viable, leading to cheaper construction methods since even relatively poor building envelopes became worthwhile.
Every general contractor or prefab house manufacturer must have been pleased. Because where did the additional profit go now...
Photovoltaics typically cover about 25% for private households, and the energy is generated at the wrong time.
The actual electricity delivered cannot be CO²-neutral, since the total renewable energy produced in Germany barely covers current digitalization needs.
And even experts like Prof. Lesch offer no solutions for the future here.

After all, politics trusts citizens can calculate and think logically.
That’s why KfW40+ is only subsidized with battery storage. Which is an ecological disaster similar to all electric cars. No one will buy a new battery for €21,000 for an ID3 after 8 years. The old one currently can only end up in an incineration plant, as it is not recyclable. The environmental damage and child labor in Africa or Latin America for lithium and cobalt mining are not even mentioned.

Whether KfW55 or not is currently not even a question, because building a KfW55 house is simply cheaper than an Energy Saving Ordinance house. The lower ancillary costs are not even considered.

Then in 2021/22 comes the enormous depreciation of Energy Saving Ordinance houses, when under the new Building Energy Act only new buildings as passive houses will be approved.

One must never forget that many political decisions are often heavily influenced by lobbies. Which are not the lobbies of the average consumer.

Because if the state suddenly lacks mineral oil tax, what energy source can this then only be levied on?

Interesting!
What would, in your opinion, be the logically sensible recommendation for a house builder in 2020?

2020-06-26 17:10:52

A value will always remain as long as people live there and hopefully there will also be funding for the inventory. Even though the grants are currently very generous and almost every barn is becoming a multi-family house. At least we have never had as many barns under conversion as since January with the KfW grant changes.

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KfW - construction: is it necessary or not?

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