Newly built single-family house - gas or air heat pump + photovoltaics + storage?

Hello everyone,

a few days without checking the forum and my thread already has 26 pages :eek::eek::eek:
A brief update, since we want to start building next year, nothing has happened yet for me.
It will be photovoltaics (+storage) + heat pump (+storage) + underfloor heating ... Meanwhile, the question is more whether to go WITH KfW or WITHOUT? Why? 90% of current builders in my area would not use KfW, or not again, because 1. the interest rates are so low, 2. they say yes, the subsidy is nice and all, you can at best break even on the supply temperature but since our energy consultants do not provide construction supervision, the administrative effort during the already stressful construction is very high.
This statement (and similar ones) I keep hearing again and again.

Now I ask again to the group, what EXACTLY do I have to do and provide for KFW 55 EE in order to get the funding?
- Document photos?
- Receipts of materials?
- Receipts of executed trades (from all or only from those relevant for KfW - which are those?)
- For 55 EE blower door test?

I want a lot to be done by friends as personal labor, so there won’t always be invoices.
I don’t want this to break my neck when it comes to eligibility, right?

Is there not a detailed step-by-step description with the requirements on the KfW website (or elsewhere)?

Regards
Flo

You definitely need an energy consultant. They can then tell you what you need. With us, the builder did everything. I hardly had to do anything except be at home for the acceptance appointments and sign a few forms beforehand to send to the energy consultant.

That you only break even on the costs, I cannot confirm. Our house already met the Kfw55 requirements, the only choice was between a gas heating system (then no Kfw55) and a heat pump (then Kfw55). This resulted in additional costs of about €4000, with a subsidy of €18000 the decision was quickly made.

except to be at home for the inspection appointments

Inspection appointments? Plural? What is being inspected when?

the choice was only between gas heating (then no Kfw55) and heat pump (then Kfw55)

I don’t really have that choice. There is no gas on the property, well, for 3k I could have it installed. But I have now asked a local provider for an offer for a photovoltaic system. 10kw + storage 27k, and suddenly the subsidy of 26,250 is gone.

Acceptance dates? Plural? What is accepted when?

I don't really have this choice. There is no gas on the property, which is good; for 3k I can have it installed.
But I have now had a local provider offer me a photovoltaic system. 10kw + storage 27k, and suddenly the subsidy of 26,250 is gone.

The shell construction (although you don't necessarily have to be there) and the blower door test.
Then the energy consultant told me that he still needs various documents from the builder, basically proof that they actually used what was specified in the application. He also remeasured the thickness of the insulation material used.

I would not include photovoltaics in this calculation, since it is supposed to pay for itself (we don't have one, I want to look into whether it really pays off next year, first to see how much electricity we really need, since we heat a lot with wood). But even if you build one, you should offset the saved electricity costs.

Leave out the storage. It eats up the profitability of photovoltaics. More info gladly via PM.

when are you building (approximately which quarter), with whom (general contractor or individual contract) and what (solid construction or timber frame)?

It is currently not excluded that the new government will launch some immediate program that directly affects you. There are things that must be determined during the planning phase, but there are also things (e.g. sizing photovoltaic systems, possibly storage) that can be defined during construction depending on the current funding programs.

A good energy consultant is much more than just a number cruncher for building applications and KfW, and can especially help with optimizing construction methods, building services, and funding topics. I would try to get an engaged consultant and involve them from the beginning.