I think £3500 for flashing on two chimneys is utterly staggering. Assuming the usual simple lead flashing I see guys put on Victorian houses I'm going to guestimate the lead plus misc materials at £60 per chimney, scaffold £500 for two done together. I reckon it would take builder/roofer + mate max 2 days at £300/day labour. That's less than £1300 for the job.
I've assumed gable end chimneys which are easiest but if either is situated centrally along a roof ridge allow an extra £300 scaffold/materials/labour costs.
It annoys me when roofers/builders will charge folks materials at full "retail", a good chunk of labour... but then add a massive profit element which is totally unrelated the the complexity of the job... more to top the bill up to what they think you'll pay.
Same as double glazing. Quite possible to supply/fit a 12 window house with basic double glazing for £4000 charging a fair labour rate... or charge £7000 if the owner is gullible enough.
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