Your worrying over nothing.
Hi all, As part of some building works Im knocking through into the garage from our downstairs bedroom to make a double instead of a small single. We are having the roof replaced on the garage as part of the works, bco has stated we have to have a warm roof with 120mm insulation, we had...
www.diynot.com
I went through similar over 100mm as you can see above and the council weren't interested I just had to go through the hoops to make the paperwork right.
They'll come out, inspect, you'll explain about your error with the roof, I told them I'd honestly miscalculated the amount of insulation in the roof and they agree it has to be built to building regs and that was it really