I went through a bit of a low point recently.
Building regs treat a change of use much the same way as a new build. I’m looking at over £40k of insulation, secondary glazing and fire doors and that was half my budget for the whole project.
Secondary glazing and nice fire doors cost money, but it’s at more than the same again for knock ons like removal of failed waterproof paint on the outside and lowering ground levels to make insulation feasible that make it expensive.
But I’m fine now. I spent £3500 yesterday on shiny things. The first arrived this morning. A 9.4m scaffold tower!
I only have it up to 6m at the moment. If I get braver with heights I’ll go to 8m to sort the blocked off chimney that is splitting due to damp from not being vented.
Just at the moment I’m removing waterproof paint with a paint stripper to allow the walls to dry out before adding insulation.