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.
Bauexperte schrieb:
Hello Tox,
I think you are mixing things up here.
For a single-family house built to KfW 70 standard, you don’t need an expert or assessor, but you do need a structural engineer or energy consultant to complete form 153. And that is really not new.
Regards, BauexperteHmm, I believe @Lexmaul79 mentioned something similar in another thread, that this has been required since 2015 -> an expert... maybe they will chime in here again.
S
Sebastian7911 Feb 2015 13:19No, it has actually been a requirement since June 2014 that an expert must be involved with a KfW70 house. I didn’t want to believe it at first either, but that’s what the KfW website says...
Nobody seems to be messing around with that in my case either – and I don’t mind, since I have the confirmations and receive all the necessary documentation...
Nobody seems to be messing around with that in my case either – and I don’t mind, since I have the confirmations and receive all the necessary documentation...
T
toxicmolotof11 Feb 2015 13:24@Bauexperte - I think I’m right, but I wouldn’t bet a euro on it.
I’m on a break right now and will take another look at the KFW terms shortly.
In my opinion, it’s as Lexmaul described. There have been some changes with the brand-new programs for the updated energy-saving regulations.
The certification for KFW70 (old) was just a formality. With KFW70 (new), they wanted to achieve better control and quality.
I’ll get back to you.
I’m on a break right now and will take another look at the KFW terms shortly.
In my opinion, it’s as Lexmaul described. There have been some changes with the brand-new programs for the updated energy-saving regulations.
The certification for KFW70 (old) was just a formality. With KFW70 (new), they wanted to achieve better control and quality.
I’ll get back to you.
B
Bauexperte12 Feb 2015 10:19Hello Tox,
Regards, Bauexperte
toxicmolotow schrieb:No, nothing has changed regarding KfW 70; it has always been required that a certified expert completes the corresponding forms. Furthermore, only from KfW 55 onwards do external assessors need to accompany a building project.
There have been some changes with the latest software for the new energy-saving regulation.
Regards, Bauexperte
S
Sebastian7912 Feb 2015 10:26The technical data sheet states the following (and this applies to all KFW buildings):
− Develop and implement a comprehensive energy concept for the building’s thermal protection and energy system technology within the framework of the Efficiency House calculation (including consultation on implementation options if necessary).
− Provide planning to minimize thermal bridges (thermal bridge concept) and ensure building airtightness (airtightness concept).
− Assess the need for ventilation measures (e.g., according to DIN 1946-6) and inform the building owner of the results. The building owner is responsible for initiating the implementation of ventilation measures.
− Confirm the planned energy performance level on the KfW form “Confirmation for Application (BZA).”
− Participate in tendering or request for quotation processes and check the offers for compliance with the scope and quality of the planned energy-related measures.
− Before plastering or applying subsequent claddings, carry out at least one site inspection to verify the execution of energy-relevant, especially later inaccessible building components (such as thermal insulation construction), as well as the implementation of the thermal bridge concept, airtightness concept, and system components.
− Verify the implementation of ventilation measures (if carried out).
− Verify the execution of an airtightness test.
− Check the installed materials, products, and components of the building envelope and energy system technology for compliance with the planned energy measures according to the Efficiency House calculation.
− Communicate the parameters from the energy demand calculation for the heating system (and, if applicable, the solar thermal system) to the heating engineer for implementation. Check the proof of hydraulic balancing and commissioning of the system (if applicable, heating and ventilation systems). Verify the handover of the energy system technology (including additional technical instruction if necessary).
− Document the energy specialist planning and the supervision of the construction project.
There is no longer any distinction made between the different standards at all – so what now?
− Develop and implement a comprehensive energy concept for the building’s thermal protection and energy system technology within the framework of the Efficiency House calculation (including consultation on implementation options if necessary).
− Provide planning to minimize thermal bridges (thermal bridge concept) and ensure building airtightness (airtightness concept).
− Assess the need for ventilation measures (e.g., according to DIN 1946-6) and inform the building owner of the results. The building owner is responsible for initiating the implementation of ventilation measures.
− Confirm the planned energy performance level on the KfW form “Confirmation for Application (BZA).”
− Participate in tendering or request for quotation processes and check the offers for compliance with the scope and quality of the planned energy-related measures.
− Before plastering or applying subsequent claddings, carry out at least one site inspection to verify the execution of energy-relevant, especially later inaccessible building components (such as thermal insulation construction), as well as the implementation of the thermal bridge concept, airtightness concept, and system components.
− Verify the implementation of ventilation measures (if carried out).
− Verify the execution of an airtightness test.
− Check the installed materials, products, and components of the building envelope and energy system technology for compliance with the planned energy measures according to the Efficiency House calculation.
− Communicate the parameters from the energy demand calculation for the heating system (and, if applicable, the solar thermal system) to the heating engineer for implementation. Check the proof of hydraulic balancing and commissioning of the system (if applicable, heating and ventilation systems). Verify the handover of the energy system technology (including additional technical instruction if necessary).
− Document the energy specialist planning and the supervision of the construction project.
There is no longer any distinction made between the different standards at all – so what now?
B
Bauexperte12 Feb 2015 10:29@Lexmaul79
We could have a long discussion now, or I could explain every sentence from the technical sheet to you based on common practice. I’ll keep it simple: You are right, I’m at peace, and we will continue working as before.
Best regards, Bauexperte
We could have a long discussion now, or I could explain every sentence from the technical sheet to you based on common practice. I’ll keep it simple: You are right, I’m at peace, and we will continue working as before.
Best regards, Bauexperte
Similar topics