Please assist with the evaluation of construction costs

Garage gone, double carport with storage room added and at least 2/3 saved.

Then, after the discussion, the basement would be an even more expensive, pointless option, as it usually only serves as an expensive storage room. The air-water heat pump instead of a brine-water heat pump is often a reasonable decision in many respects. I have made several calculations on this in another topic. You can say whatever you want about the roof tiles.. It depends on what you like. Budget constraints, I think, are more visible in roller shutter straps instead of electric ones, laminate, bathroom, kitchen. Incidentally, for Lower Saxony for example, I only find that a definition of the garage and for small garages a limit on the storage amount of gasoline and diesel is necessary. As long as the main purpose lies in parking motor vehicles, I see no problems. But feel free to correct me on that.

also check with your municipality whether it has issued a [Stellplatzsatzung].

Thanks once again

The topic of basement/no basement has really become a "matter of belief" by now. We consciously decided against it precisely because we want to make the garage bigger to have space for bicycles and 2-3 heavy-duty cabinets where we will store our stuff. I believe everyone just has to decide according to their priorities. You still have space in the attic for decorative stuff etc. The tip about a double carport with storage space is indeed worth reconsidering. It would definitely offer more freedom for one or the other smart home gadget

The topic of air-to-water heat pump vs. district heating also occupied me for a long time. The tendency towards district heating is not primarily due to cost savings but simply because the price is really fair here in our city and you have no "stress" with the issue – meaning no owners’ risk etc. My full costs are 20-30€ more per month than with an air-to-water heat pump with photovoltaics. But as I said, 24/7 service – everything is perfectly set up by a professional – you have much more space etc. Beyond that, you don’t know how electricity prices will develop – the consumption share of district heating is linked to the gas price index, which has been quite stable for years (unlike electricity).

I would like to better understand the tip "solar is not worth it." My tendency really leans more towards photovoltaics to significantly reduce our electricity consumption.

That it can become tight in Hessen worries me a bit because, as I said, our budget is fixed. I am already considering whether it might make sense, for example, to hire good companies from Eastern Germany. Friends of mine have already had good experiences with this. Two friends also used windows from Poland (of course the same well-known brands as in Germany). There were significant savings possible (up to 30%).

Then after the discussion, the basement would be an even more expensive, pointless option, as it usually only serves as an expensively built storage room.

I also did not say "Build a basement instead of a garage," I only pointed out that in the list apparently "higher quality" solutions were cut for budget reasons, while a garage is still insisted upon. I personally find that strange because a) there are cheaper shelter options for beer benches, grill, etc., and b) a car does not have such a high value to me that I would want to provide and pay for an extra "house" (aka garage) for it – especially when I generally already lack money.

I would like to understand the tip "Solar is not worth it" a little better.

I wrote "solar thermal," meaning hot water or heating support using solar collectors. These are so expensive to purchase that they usually do not last long enough to actually generate savings in the end. This is due not least to the comparatively low cost of heat in a modern building. It may look different in an unrenovated old building.

I wrote "solar thermal," meaning hot water or heating support using solar collectors. These are so expensive to purchase that they usually don’t last long enough to actually generate savings in the end. This is not least due to the comparatively low costs for heating in a modern building. In an unrenovated old building, it might look different

Ok, thanks! So district heating + photovoltaics / air-water heat pump + photovoltaics Currently, I would start with district heating for the first 10 years (that’s my current inclination) and then after 10 years consider whether I want to stick with it. So far my conclusion (regarding costs) – calculation looks good, with a "risk" of around 30,000 EUR. Sounds like a task...