Lobster wrote:
Tez wrote:

One builder mentioned increasing the thickness of the ceiling below to
meet building regulations.

Are there basic regulations that have to be met when converting an
attic to a third bedroom - fire resistance, ventilations, insulation,
fire escape?

http://www.internode.co.uk/loft/

From the link:
50 sheets of plasterboard up into the loft springs to mind. The sums
suggest that the total of 1.2 Tonnes.

So what else is going up the wooden stairs to Bedlington? There must be
quite a weight all told.