We had a new boiler fitted,
new gas supply to it from outside of the house,
floor boards across the whole top floor had to come up,
Condensation waste pipe had to be rerouted out of house into a waste pipe (this work had to be carried out over a conservatory roof without good access),
A new flue was fitted to take it away from two bedroom windows,
3 plumbers over three days who did all together about 50 hours work.
Also, they were lovely blokes, really efficient, appeared to do excellent work and we were impressed.
What sort of figure would you expect to pay in total just for labour before tax?