Thanks wrightyson
The work was done by two roofers and a labourer. They worked two pretty full days (0730-1730 first day and 0800-1500 second day) and looked to be working hard, quickly and effectively. To be honest I think all the problems have come from the boss at the office rather than from them.
The extra tasks detailed (and in their words) are:
1. Removed rotten rafters to the rear annex
2. Supplied and fixed replacement rafters (all old original rafters were moving and not fixed at the bottom and top wall plates).
3. All toes and rafters (top to bottom) were re-screwed into the wall plates
4. Supplied and fixed rafters in between the old original rafters (to re-strengthen annex structure).
5. The bottom of the rafters (joining on to bottom wall plates) were treated with Cuprinol.
6. Top course of slate batons were drilled into the top wall plate to strengthen and bind the annex roof structure.
7. Supplied capped ridges (different to original quoted ridges)
Of these tasks:
Numbers 1, 2 and 5 were simply not done. I have proof of this (photo of old rafters still in place!)
Number 3, 4, 6 were done but seem to involve minimal materials or labour
Number 7 was done but I would only expect a marginal cost increase as the original quote also included replacing the ridge tiles (and really I would have expected them to know what sort they needed as they came to look at the job)
The total extra cost for these items was £630.
I’d be grateful for any opinions on how much a reasonable extra cost would be. For what was actually done I am thinking around a third of that. I don’t really want to turn this into a big hassle but equally I don’t want to pay for work that has not been done.