Selling house - no building regs for re-render

RAS

Assuming you have replaced the windows in wall that has been rendered, you haven't re-rendered half the external envelope? Area of rear wall minus (area of windows plus area of trickle vents).

housebuyer7

So we removed existing render. Then had the windows replaced, then re-rendered. @RAS

stuart45

If you download part L of the regs, it will explain it. When you take the render back to brick, it's whether it's more than 25% of the envelope(which is walls and roof), or 50% or more of the individual element, which is in your case the masonry of the rear wall. 

housebuyer7

Hi @stuart45 here’s a rough sketch of my floor plan. Is the render more than 50%?

stuart45

I'd say that's more than 50%, so Building regs would have applied. However, as this point a surveyor can't tell whether the wall was hacked back to bare brickwork. A top coat could have been applied over the existing, and it would look the same. They also can't date when the work was done, so could have been pre regs.