Renovation of a 1960s house: Questionable expert recommendations?

Almost everything was estimated way too high.
Heating pipes 12k :p
For that, you get fresh water, heating, and wastewater piping new, and there’s still some left over.
Electrical is enough with 15 if you don’t need KNX or 1000 spots.
The insulation above the rafters is also wasted money.
Remove the rigid foam boards, possibly put in a new underlay membrane, and then do new insulation between the rafters.
That costs 10% of the estimated amount for the insulation above the rafters and you can do it yourself quite well.
The roof is not new but not broken either.
In my opinion, the floorboards can still be renovated, it could just be a lot of work.
How do you get 12k for interior painting? Does the plaster need to be completely renewed or what? Painting should be done for 2-4k, can also be done yourself and only costs material.
You can get absolute luxury bathrooms for that money, nice ones are possible for 1/3-1/2 as well.

It's always a question of personal preferences. If you want to overhaul everything and reduce consumption as much as possible, you have to invest significantly more money and turn everything upside down. Or you say you only do the necessary and save a lot of money, but then live with higher consumption. That's more of a fundamental decision.

: I know that it is the most expensive type. The tiles are 40 years old, I posted pictures further up.

Just briefly about the roof tiles. If I remember correctly, the house is covered with [Bieberschwanzziegel] - if these are properly installed and there are no significant weak points / defects on the roof, such a roofing, according to our roofer, can have a lifespan of 80 years.

Of course, it depends on what you want - if it is important to you that the roof is insulated with an underlay membrane, the roof tiles have to come off. If it is sufficient for you to insulate the roof with insulation between the rafters and insulate the top floor ceiling, the roof covering can be preserved. It depends on your needs regarding roof insulation (and your personal aesthetic preferences). A properly [Bieberschwanzziegel] covered roof that has no damage does not necessarily have to be renewed after 40 years.

It’s always a question of personal preferences. If you want to completely redo everything and reduce consumption as much as possible, you have to spend significantly more money and turn everything inside out. Or you say you only do what’s necessary and save a lot of money, but then live with higher consumption. That’s more of a fundamental decision.

Definitely. Maybe you notice while reading how I’m wavering. At first we wanted to renew many things, but not everything. After the surveyor slowed me down a bit and wanted to leave a lot as is, I became a bit more cautious. But after I realized how much funding is actually available, I’m currently back on the idea of a “comprehensive core renovation.” Many wild ideas are in play, right now I’m flirting with plenty of insulation, underfloor heating everywhere, and a hybrid heating system: heat pump with photovoltaic self-consumption, plus a buffer tank, to which a new wood stove with a water jacket is also connected.

Just very briefly about the roof tiles. If I remember correctly, the house is roofed with Biber tail tiles — if they are properly laid and there are no significant weak points or defects in the roof, such a roof covering, according to our roofer, can quite well have a lifespan of 80 years. Of course, it depends on what you want — if it’s important to you that the roof is insulated with an underlay membrane, the roof tiles have to be removed. If it’s sufficient for you to insulate the roof with insulation between rafters and insulate the top floor ceiling, the roof covering can be retained. It depends on your needs regarding the insulation of the roof (and your personal aesthetic preferences). A properly laid Biber tail tile roof without damage does not necessarily have to be renewed after 40 years.

Yes, that’s right, Biber tail. So far, no weak points are known, but no one has yet crawled into the tiny attic above the top floor. I know the tiles themselves would still last. If it comes down to insulation between rafters, they could stay on. With insulation above the rafters, I assume a new covering makes more sense than reusing the old tiles (see also the post with roof pictures). They are moss-covered and might look a bit strange on an otherwise completely “new” house; that’s where aesthetics come into play. I still have to delve deeper into the whole funding topic, but at first glance almost everything is subsidized, so my tendency is currently leaning toward new tiles. And “quite 80 years” also means “quite” and not “definitely.” Three major arguments currently speak for the core renovation for me: 1. only one big construction site and then peace 2. take advantage of subsidies now. Who knows how it will look in 20 years 3. technology concept feasible with which I can really be satisfied. I’ll develop several concepts and then discuss them with a KfW-compliant energy consultant. If there’s interest, I’ll gladly keep you updated here, then maybe the thread title should be adjusted.

... Hybrid heating system: heat pump with photovoltaic self-consumption, plus a buffer, to which a new wood stove with a water jacket is also connected.

Heat pump always without buffer, it only costs (a lot of) energy. The additional installation for integrating (and controlling) the wood stove alone will be four-figure and can never pay off. On top of that, a huge buffer, a very expensive stove... Try to keep it simple. So at most, in an emergency, if it's absolutely necessary, a small wood stove for the ambiance.

You can read up on the topic in the HTD forum.

Heat pumps always without a buffer, it only costs (a lot of) energy. The additional installation for integrating (and controlling) the wood stove alone will be in the four-digit range and can never pay off. On top of that comes a huge buffer, a very expensive stove...
Try to keep it simple. So at most, in an emergency, if it really doesn’t work without, a small wood stove for the romance.

You can read up on the topic in the HTD forum.

Okay, heat pump and water jacket probably don’t go well together. I got a bit carried away ;-)