Insulating a sand-lime brick wall / upgrading construction energetically

when we remove these wooden panels we see the sand-lime brick

This surprises me to the extent that in the description of

storey wall outside 36.5 cm brick masonry with outer sand-lime brick cladding as exposed masonry–plastered inside

it is said that brick should be visible on the inside. Unless you have looked inside a window reveal, where the outer shell might have been wrapped around. As I interpret the plans, one shell of sand-lime brick outside (one brick thick) and one shell of brick inside (one brick thick) were erected together without separation (and without an air gap) in between, probably also connected with anchors. Thermally thus monolithic, though not homogeneous.

The wooden panels were probably added afterwards, and in the quality as in the example picture rather of quite recent origin. Since the bricks in this bond are likely solid bricks, a previous owner was probably at some point not satisfied with the insulation value of the exterior walls (and I accordingly expect this approach only on those exterior walls where no other terraced house adjoins).

For insulation purposes this only makes sense at all if behind, presumably between battens, insulation boards or mats have been installed (the wooden panels alone bring nothing). Sockets were probably moved forward onto the new wall surface, i.e. when removing the boxes the stud wall structure should become visible.

Yes, I checked at the corner by the window and it looked like this limestone.... but well, the great wooden panel construction is coming down anyway, so back to the beginning as in the construction plan. What makes sense for the insulation layer, what do I need to pay attention to so that this condensation problem does not occur or is kept as minimal as possible.

The starting point is the brick wall....

Yes, I looked at the corner by the window and it looked like this limestone.

I suspect that the outer shell also lines the reveals. And furthermore, my assumption is that there is a masonry bond across both building materials continuously in the 2DF format with solid bricks. You can see more details once the wall is stripped bare. Only when you see which brick it is can you say more precisely about the additional insulation needs. But independently, you can’t really see that; insulation / ventilation / window must be considered together. What about the windows: still original, wood? Given the similar and equally old neighboring houses, it should be enlightening to talk to the neighbors: work has surely been done there already and answers to your questions found, in other words, the building fabric clarified.

Hello,

yes, the windows still have the original mahogany frames. However, the glazing has already been replaced, so originally we wanted to wait and see how the budget turns out (I still have the water pipes in mind) most of the neighbors still have the old windows (the housing estate is only slowly being replaced with the new generation)

Our immediate neighbors have just replaced everything, and I also got a card from the company.
I would like wooden windows again or wood/aluminum (I don't find plastic aesthetically pleasing)
Although I would like to go for floor-to-ceiling windows, currently the windows are complete modules made of wood, so under the window there is only wood, no masonry.

What does the energy consultant or [Bausparvertrag] say? Especially since certain deadlines and obligations also arise due to a change of ownership

what do you mean by deadlines and obligations,