It's completely normal. Every house in the townhouse development from 2001, where we lived for 18 years, had it. It also wasn't a problem when selling.
But was it also due to the transition between the two building materials? What has changed in the construction method so that it no longer occurred later (because you said yours was from 2001) like this one here as well. By the way, energy value of 120... was that normal for that time? I've seen different things. Some from the 80s with a value of 80, but I assume they were insulated afterwards.
I assume that this still occurs. You cannot see it when there is a glass fiber fleece in front of it. Mentioned the year of construction so that you recognize that there is a temporal comparability with my experience. I no longer know the insulation values.
We also have (Reihenmittelhaus Bj. 2000). Only in the stairwell from the upper floor to the attic. A buddy in his semi-detached house from 2000 has that too. Our terraced house has a specified consumption of 59 kWh/m2/a (class B). I find 120 a lot. That should be class D. But if people have always heated heavily and kept the windows nicely tilted...
But was that also due to the transition between the two building materials?
If you are uncertain, you have to send in a building expert. Otherwise, you have no certainty. By the way, real estate agents are sellers and not building experts!
If you are unsure, you have to send in a building expert. Otherwise, you have no security. By the way, real estate agents are sellers and not building experts!
The predecessor (tenant) meant he had 1000 euros of additional costs per year for heating and hot water. We already have that here in our 4-room apartment as well.