What does this mean and is it a big no?

[messyhouselady]

In home report.

Upper wall to front elevation is only 150mm thick and is timber frameworks clad externally with timber boarding.

Obviously I can see the cladding but does this mean there’s only wood underneath?

Ask whoever wrote the report.

It would imply that it is just a timber frame wall with external cladding, no brick or block behind it. A modern cavity brick / block wall is usually 300mm thick.

It's an unusual buildup for an upper level, is it a dormer or a later extension?

Helpful Paula, thanks.

It doesn’t appear to be Maria. I’d be concerned about cold bedrooms I think.

A150mm timber wall should be built with insulation between the frame I would hope. If not, is easier to insulate than a standard block wall. I would worry why that method was chosen, it could it the lower levels aren't structurally sound enough to take the loading of a block wall or if it's a new build that the builders are cutting costs.