Realistic cost estimate: Single-family house with unfavorable development location

Then insulate your intermediate ceiling. It is technically pointless, but that hasn't mattered in house construction for a long time anyway ;) And another reason why construction costs are exploding...

PS:
And also the topic of "using resources sensibly and efficiently"...

Memo to myself: do not upload anything about insulation from our building description here :D Although I am very happy about how eagerly this is being discussed!


Thank you very much for your constructive contributions! The topic of lighting also gave us a lot of headaches and we have similar concerns. In the utility room, we hope to mitigate the problem somewhat with a door featuring a large frosted glass insert, but ultimately, spots will definitely be needed there. In the kitchen, we debated for ages whether windows should face the east side. However, there is the garden of the apartment buildings, where we would lose our privacy screen (and ironically, people often walk their dogs there) and it would block space for wall cabinets. Due to the apartment buildings and a large tree, light from the east side is also limited. We then wanted two double floor-to-ceiling units instead, but that leaves hardly any space for the kitchen island. That is why we chose the solution we have now. The good thing for us is: we now have a very similar window configuration, but facing northeast, so it can only get better :D

The misunderstanding probably arises from the fact that many believe insulation completely prevents heat loss. No, insulation only delays it.

If a well-insulated house is heated to 20°C and the heating is then turned off, it will eventually cool down to the outside temperature without any heat source.

It is similar with the suspended ceiling. Two rooms, connected only through the suspended ceiling, will reach a temperature equilibrium. With insulation it happens more slowly (where air exchange also plays a role), without insulation faster. Although concrete also has a certain thermal resistance.

The misunderstanding probably arises from the fact that many believe insulation completely prevents heat loss. No, insulation only delays it.

If you heat a well-insulated house to 20°C and then turn off the heating, it will, without any heat source, eventually cool down to the outside temperature.

It’s similar with the intermediate ceiling. Two rooms, connected only via the intermediate ceiling, will reach a thermal equilibrium. With insulation, this happens more slowly (although air exchange also plays a role here), without insulation faster. Although concrete also has a certain thermal resistance.

That’s correct.

But IF it is heated, it will get equally warm with less heating capacity or warmer with the same heating capacity, the better it is insulated.

And absorption of sunlight by floors/furniture/walls is nothing other than a heater.

That makes a lot less difference with a few degrees of temperature difference than you think. Insulation relies on a large delta T. Inside 22°C, outside -10. That makes sense... but not with 21°C living room to 18°C bedroom...

For us, it's not just 3 degrees in winter. The living room is liked cozy by the wife with 23-24 degrees, and in the bedroom it can get as cold as 12 degrees in severe winter. And since heat rises, insulation certainly makes sense, right? Especially since it will be a wooden beam ceiling, not an "insulating" concrete ceiling.

There is only one person here who believes something. If you don’t have insulation under the underfloor heating, the ground floor is heated both from above and below. But the upper floor is only heated with half the power from below. Good luck trying to adjust the hydraulics here. And yes, warm air rises. However, a modern low-temperature underfloor heating system works little with convection and mainly with radiant heat. That doesn’t travel around 5 corners through the staircase.

Now please get back to the topic ;)