Single-family house built in 2004 Renovation plan / Photovoltaics etc.

If you don’t know what to do with the money, you can definitely do something. Otherwise, it’s the famous carrying water to the stream...

Hmm, you mean it’s pointless because the money we save is a joke compared to the investment costs?
(which is actually a legitimate thought that hadn’t really occurred to me yet even though it’s obvious)
The heating system has been acting up repeatedly for years (usually it’s some kind of error -> restart then everything’s fine, if it doesn’t work a technician comes and then you have peace for a while). I think sooner or later it will give up the ghost.

A house from 2004 is modern,
first move in and pay the heating costs.
If the heating system becomes a money pit, rethink.
The houses from 2004 are not being torn down left and right because of energy efficiency, they are being lived in.

Yeah, I have to find out what we have paid so far for heating costs, I know our tariff is basically quite okay because it combines several larger contracts (with a hall etc.), which rather speaks against photovoltaics.

... what do you think, who reads this like that?
If there are various variants, it would have been more sensible to make a post here per variant with a summary and, if necessary, the exact documents... but this, this is already pretty demanding. :confused:

Yeah, to be honest, I imagined it differently too, only at the end of writing did I see that only JPGs work and then that's how I came up with it. If the mods approve, I’ll share the Google Drive link for the respective PDFs here (in case a mod reads this).

Hello :)

May I ask what the background is for energetically renovating a building that isn’t even that old? On what basis were the investment costs calculated? Prices are pretty nasty at the moment.

Best regards

The heating system regularly acts up, various defects on the house that bother (plaster broken).
Both are of course cheaper & easier if replaced individually but if you’re already at it.
“Being a bit more modern” is of course also a thought but in no case financially sensible I think.

Sorry, but nobody reads this.

Basic procedure:
1: Fill all roofs with photovoltaics.
2: If there is something to renovate, renovate.
3: BEFORE the heating system breaks down, make a proper plan on how to quickly switch to a heat pump in an emergency. Once the plan is ready, you can also switch earlier anytime. The kids will thank you.

Is it even a thought to keep the boiler (even if it often breaks/errors) and heat most of it with the heat pump and just fire up the gas boiler in winter sometimes?

The argument from the energy consultant was that it doesn’t make sense to only do photovoltaics/heat pump if all the energy is lost through windows etc., but that’s exactly the point where I can’t argue.

I would first of all take care of all the moisture damage.

How is the heating implemented? Underfloor heating or radiators or a mix of both?

various defects on the house

Is it even an idea to keep the boiler (even though it often breaks down/has errors) and heat most of the time with the heat pump and just turn on the gas boiler in winter sometimes?

maybe you should simply fix the defects that could cause problems on the facade.

If the mods approve I will share here the Google Drive link for the respective PDFs (in case a mod reads this)

PDFs probably won't be read either because the necessary evil for laypeople is not recognized by you. The pictures and numbers say too little about it.
Your house has the rating E, I would get a consultant to come and see what could be changed in the next 10 years, e.g. windows or roof insulation. Heating is acting up but works. Nothing needs to be done about it then.

Heating regularly acts up, various defects in the house that are annoying (plaster broken). Both are of course cheaper & easier if replaced separately, but if you're already at it. "Somewhat more modern" is of course also a thought, but I don't think it makes financial sense in any case now.

But what was the assignment for the energy consultant? To get the maximum subsidy for things you want to do anyway? Or a sensible renovation plan for a quite young house? Please put together the measure packages clearly again and say what you want to do and why. If I understand correctly, your house currently has rating E, planned with all 5 packages is "only Kfw 70 EE". But you actually only want level 1, right? There's always a lot about an extension. Is it already built? Or is it being newly built? Are all the windows being replaced, or only the glass? How many of them are really broken? To be honest, I don't really get your plan. And definitely ask the energy consultant how he calculated the investment costs.

Just a dumb side question: 134kWh/m² - is that normal for a house from 2004? We consume about the same per living area in our house built in 1930 (interior insulation on the ground floor, exterior insulation on one side, two sides of insulated mansard roof). 28,000kWh for 200m².

Or am I confusing something here?

Just a stupid side question: 134kWh/m² - is that normal for a house from 2004?

Our old house from 1995 with 110m2 consumed about 70kWh/m2.
I would first use a thermal imaging camera to find the weak spots.
The first candidates for me would be dormers, extensions, side walls, roof insulation (often just loosely installed and with gaps, because it was Friday).
And only then take action.