Advice re disastrously unsafe roof

theoretica

Did the extension need planning permission?  If it did you should be able to download the plans from the council planning department and they might be interesting and/or have the architects name on. Unless you have them already!

Ergates

Zimm190 said:

We had another builder come to look at it yesterday, who had a similar response (never seen something so terrible in 12 years, it'll be down with a strong wind or heavy snowfall, etc..) but they have quoted £6.5k. 

Except the extension has been there for, presumably, several years now (do you know when it was done?), and we've certainly had plenty of incidents of strong winds and heavy snowfalls in the last few years, and it didn't come down.

We had a very similar sounding issue when we bought our first house.  I forget the exact details (this was a little over 20 years ago!!) but the extension roof wasn't properly attached to the wall of the house and also wasn't properly attached to walls of the extension (or something like that).

We got it fixed as we were having a load of building work done anyway - but it had been like that for at least 10 years without collapsing.