Hi ladycornelia, didn't you give them a price before they gave you the job. As iBrowse says most would have asked for other estimates before giving the job. Personally I would price up per room then add them up, work out how much you want for each room, ie how long each will take, how much you want per hour, how much it will cost to employ the others, their hourly rate may be different to yours and how much materials will cost then give price based on that. Not forgetting parking use of skips, any scaffolding you may need etc. Most people would add on a margin for profit but in today's economic climate I wouldn't be too greedy with that.