If i paid more than £5k for that work i'd be seriously p**sed off.
Over estimating on everything including 3 men taking 4 days with machine hire, if they have their own machine which you would expect with people that are doing driveways for a living it would be less but only a couple of hundred max. With 25% of cost on top i'd be looking at £4k max with a good profit, as a general rule you'd price and add 10%-15%, but then everybody prices different
This obviously would depend where you are based, this is for ooop norf in Yorkshire.
Aaron
