On Wed, 19 Dec 2018 20:22:57 +0000, Tim Lamb
wrote:

Building control are stressing about the lack of a protected exit from a
bedroom in the chalet bungalow.

One way out:-) would be a top hung roof light. Marley concrete tiles.

Anyone done one? Any reasons why it needs a professional roofer?
Some years ago now, but I've put 4 in, working completely from inside.
Fitting was no problem at all, only tricky bit was working out exactly
where to put them to minimise cutting of rafters and roof tiles. I
used Velux windows and flashing kits.