Bobasd.
Try the maths again?
4 @ £ 25 X 2 =??
+ £ 100 material
Any more is a rip off
And it is only one side NOT both sides the O/P only owns one half of the roof?
The main problem here is how a builder will reach the ridge, a Genuine builder has to consider his personnal liability insurance/ health and safety. he is working above first floor level .
Prices quoted here are not realistic if the builder insists on Scaffolding . If the job is passed to Insurance, the Insurance Company will expect Scaffold