Anyone had their single skin extension covered with insulated render?

[Ladycurd]

We have a flat roofed kitchen bathroom extension off our victorian terrace. It is Baltic in there in the winter. When we moved in we added central heating to house and had new kitchen and bathroom to house (hadn't been touched in 20years) which we thought would be sufficient (ha!) thing is the heating is insufficient in bathroom at end (it's okay in kitchen). We have two options- internally insulate (and basically have to redo kitchen and bathroom and lose valuable space off an already small space) or externally do the insulated render thing (may have to do some negotiations with neighbours as part of it is on boundary wall). Other issue is there is no damp proof course in the extension and it is a bit damp in places so imagine we need to get that fixed before messing about with render otherwise we could cause serious problems?
Any ideas?

[InsertUsernameHere]

We considered it (and even had planning permission for it) but ultimately we decided in internal wall insulation. (We were having lots of work done so the extra upheaval was minimal. Can you get under your floor? If so insulate under there. Roof, floor and draught proofing before tackling the walls.

From what our architect was saying the insulating renders are quite new to the market and therefore not much is known about how well they perform in RL. You will be at the vanguard - but hard to know whether it would just be an expensive paint job . Also make sure you get some who know what they are doing so you don't get problems with cold bridging or lack of breath ability.

[wonkylegs]

If you've got rising damp issues I wouldn't very careful about the detailing / use of insulated render. If not careful it will cause terrible problems as it will mean that the structure can't breathe through the external skin and it will cause problems.
If the damp is due to condensation or penetrating damp, it might help but again the route cause of the moisture must be fixed otherwise again it Will cause problems.
So firstly I'd tackle the damp, then I'd talk to specialist render companies.
Only talk to people withgood examples of work preferably locally that you can see.
Render is all about application and detailing. If done well it can be a brilliant solution, if done mediocrely or badly it can look awful and cause further problems.