Walls inside insulation?

[Bruno]

I live in an apartment and I got it an "energy inspection". The resulting "energy certificate" mentions classification B- and the points to improve are mainly inside walls and ceiling insulation.

 

The ceiling is more or less clear how to do. But what about the walls? If I was to insulate every outside wall, how does one does it especially regarding the windows frames? I mean, apart from the materials, I am having some difficulty to understand how is this insulation done regarding existing window/door frames, central heating pipes, electrical cabling and sockets, etc. The piping and electrical part is more or less obvious, but what about the walls?

 

Is this doable in an inhabited house, or is it something to consider only when building/remodelling? (eg, the house is totally empty)

[ProDave]

I doubt I would do anything personally unless you have a particular area where it feels cold or is causing a condensation or mould issue.

 

A "B" is pretty good for a mass built house and way better than most so I would be content with that.

[Bruno]

"B minus" ?

To be honest I think that the evaluation was too nice. My windows are of terrible quality (just ordered new ones), the blinds and its straps have  had direct connection to the outside, I didn't have any renewable energy source at the time of the inspection, ... And the only recommendations on the certificate are the walls and ceiling insulation.

I'm not thinking in doing it (not for now at least), but I was trying to understand how people do it ?

Edited March 25, 2021 by Bruno