We're two weeks in and I currently hate everyone 
The architect who just decided that his plans for the cellar steps, which he designed many months ago, 'maybe' breach buildings regs.
The builders, who cannot explain why 'levelling the ceiling as necessary', which was included in the quote, somehow doesn't include the work needed to level the ceiling and so must cost more.
The other builders, who think asking for the bitumen on the fence posts as specified in the quote means they can charge extra for adding bitumen to the fence posts.
Oh just all of them. So I left them a pack of rich teas this morning rather than the usual chocolate digestives as a symbol of my displeasure and that will teach them