Hello everyone,
We want to build a single-family house of about 170m² (1,830 sq ft).
Originally, I thought we would definitely build to KfW 70 standard, maybe even KfW 55. But in discussions with builders, we are always advised against it, as the additional costs supposedly won’t pay off and there wouldn’t be any significant energy savings later on. What do you think? How are you building?
We definitely want to use brick for construction, and we are still undecided about the heating system—gas or heat pump.
We want to build a single-family house of about 170m² (1,830 sq ft).
Originally, I thought we would definitely build to KfW 70 standard, maybe even KfW 55. But in discussions with builders, we are always advised against it, as the additional costs supposedly won’t pay off and there wouldn’t be any significant energy savings later on. What do you think? How are you building?
We definitely want to use brick for construction, and we are still undecided about the heating system—gas or heat pump.
We are building with solid masonry (Poroton T9 36.5) without insulation, and achieving KfW 70 was absolutely no problem for us. According to the energy demand calculation, we are even close to KfW 55. All of this without mechanical ventilation and without exterior wall insulation. For heating, we have an air-to-water heat pump.
Bautraum20157 Feb 2015 22:22Anyone who blindly follows KfW standards has not yet understood the entire complex system behind them.
Bautraum2015 schrieb:
Anyone blindly following KfW standards hasn’t really understood the big system behind it yetExactly. I was about to say something similar.
For the energy calculation, I was mainly interested in the costs related to the building envelope (meaning the type and amount of insulation) and the expected heating costs. This is then considered in relation to the individual situation. With the current interest rates, the whole KfW thing no longer makes much financial sense and is offset again by the additional costs for KfW70 or 55.
EveundGerd7 Feb 2015 23:13We are building 154 sqm (1,655 sq ft) according to the Energy Saving Ordinance with a gas condensing boiler and Ytong blocks without external thermal insulation composite system (ETICS).
My opinion on KFW has already been expressed by Bautraum2015 and klblb.
My opinion on KFW has already been expressed by Bautraum2015 and klblb.
klblb schrieb:
Exactly. I was about to say something similar.
For the energy calculation, the costs for the building envelope (which materials and how much insulation) and the expected heating costs were important to me. Everything is put into context to fit the individual situation. Financially, all the KfW stuff is no longer really worthwhile at the current interest rate level and is offset again by the additional costs for KfW70 or 55.Correct: the investment in relation to the final energy demand needs to be right – and that’s why we chose a specific building envelope and certain building services systems – which happen to correspond to KfW70 (just missing KfW55 because the basement is inside the building envelope).
B
Bauexperte11 Feb 2015 12:24Hello Tox,
In my opinion, you are confusing something here.
For a single-family house built to KfW 70 standard, you do not need an expert or assessor, but you do need a structural engineer or energy consultant to fill out form 153. And this is really nothing new.
Best regards, Bauexperte
toxicmolotow schrieb:
The assessor must also be involved for KFW-70 subsidies (nowadays).
In my opinion, you are confusing something here.
For a single-family house built to KfW 70 standard, you do not need an expert or assessor, but you do need a structural engineer or energy consultant to fill out form 153. And this is really nothing new.
Best regards, Bauexperte
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