I have had two very different quotes for the repointing of my chimney and external gable wall which is 96 square metres. Builder A says he will repoint the whole wall and chimney for £1200, the price of scaffolding inclusive. Builder B says he will do the chimney and whole wall for £2400, or at a rate of £20 per m2, including scaffolding and sealing the wall. Builder B is quoting £600 for the scaffolding per week, regardless of the time he won't actually be using it (below 5 metres). I have been told by two other reliable but unavailable builders that much of the wall definitely does not need repointing-only parts (one third at most). I would like advice on a) whether these quotes (especially Builder B's) seem reasonable b) whether the price quoted for scaffolding seems reasonable c) whether it is usual for scaffolding to be hired per week, even though it may not be needed for part of the work during that time d) whether it is typical for builders to prefer to redo the whole wall in order to make the job more lucrative for themselves. Any advice much appreciated as I'm new to this tradesmen game. 
