Hello,
We are planning to build an urban villa. According to the building description, it will be constructed with 17.5 cm (7 inches) calcium silicate bricks and a 14 cm (5.5 inches) external thermal insulation composite system (ETICS), with a hipped roof at a 22-degree pitch.
The ceiling height should be 2.5 m (8.2 ft) for the 138 m² (1,487 ft²) living area.
The heating system specified in the building description is a Vaillant AuroCompact with a stratified storage tank (150 liters (40 gallons)), underfloor heating on both floors with individual room controls, and 2 solar panels (each 2.51 m² (27 ft²)).
We have now inquired about the additional cost if we want to upgrade to a KfW 70 energy standard house.
The following offer was made to us:
Increase insulation thickness from 14 to 16 cm (5.5 to 6.3 inches), install an air-to-air heat pump heating system (manufacturer not yet specified), and upgrade windows to triple glazing (currently Veka with double glazing, Ug 1.0). The price is €12,500. Is this justified? I find it a bit high, especially considering that the gas connection costs have already been offset in the calculation.
Unfortunately, I don’t know the heating load.
Regards,
Kay
We are planning to build an urban villa. According to the building description, it will be constructed with 17.5 cm (7 inches) calcium silicate bricks and a 14 cm (5.5 inches) external thermal insulation composite system (ETICS), with a hipped roof at a 22-degree pitch.
The ceiling height should be 2.5 m (8.2 ft) for the 138 m² (1,487 ft²) living area.
The heating system specified in the building description is a Vaillant AuroCompact with a stratified storage tank (150 liters (40 gallons)), underfloor heating on both floors with individual room controls, and 2 solar panels (each 2.51 m² (27 ft²)).
We have now inquired about the additional cost if we want to upgrade to a KfW 70 energy standard house.
The following offer was made to us:
Increase insulation thickness from 14 to 16 cm (5.5 to 6.3 inches), install an air-to-air heat pump heating system (manufacturer not yet specified), and upgrade windows to triple glazing (currently Veka with double glazing, Ug 1.0). The price is €12,500. Is this justified? I find it a bit high, especially considering that the gas connection costs have already been offset in the calculation.
Unfortunately, I don’t know the heating load.
Regards,
Kay
B
Bauexperte1 Dec 2013 22:17Hello,
How am I supposed to know that?
I wrote from my experience that the components you described are not practical and therefore will not achieve KfW 55 standard. Your builder should know which adjustments need to be made. They have all the necessary information 😕
Best regards, Bauexperte
Nutshell schrieb:
In your opinion, what is the weak point? The insulation? The heating system? The ventilation? ...
How am I supposed to know that?
I wrote from my experience that the components you described are not practical and therefore will not achieve KfW 55 standard. Your builder should know which adjustments need to be made. They have all the necessary information 😕
Best regards, Bauexperte
Bauexperte schrieb:
Hello,
How am I supposed to know that?
I wrote from my experience that the components you described will not be practical and therefore will not achieve KfW 55 standard. Which adjustments need to be made for your building project should be known by your supplier. They have all the necessary information 😕
Regards, BauexperteI will report back once the house is finished and the final energy certificate after the blower door test is available 🙂
Nutshell schrieb:
The whole thing is documented in writing; after all, a KfW55 house was sold! 😉 Good advice:
Make sure you really *get* one. I have encountered several buildings labeled KfW55 where, in the end, it was a struggle just to meet the energy saving ordinance standard *in practice*. Your independent construction supervisor might get a lot of work ;-).
Your energy rating probably comes from the energy saving ordinance/KfW certificate? In that case, you should be aware that this figure has absolutely nothing to do with actual energy consumption. Determining the real usage requires other methods!
Best regards.
Nutshell schrieb:
What do you think is the weak point? The insulation? The heating system? The ventilation? ...When I first saw the values and KfW 55 standard, I had to take a moment as well. But your provider should know how to achieve that.
PS: We’ve already discussed this topic
https://www.hausbau-forum.de/Dämmung-isolation/8928-efh-u-werte-gut-oder-eher-nicht.html#post53081
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