I imagine this is a grumble that's going to go on and on...
Builders.
I've needed this work doing for years. I've saved up the cash, everything's in place: architect drawings, structural engineer calculations, building regulations permission. All I need now is a builder.
Builder no. 1: very keen, loves working with old buildings, can start in the new year. All goes quiet then when prodded says he's got enough work for the next 12 months.
Builder no. 2: very keen, wants to start in 8 weeks. Can't give any guesses for time/cost as it's all done by this fantastic software and most of the details are already done. All goes quiet then oh dear, the software update lost all his workings and he's off on holibobs, really sorry, thanks for being so understanding. If he thinks I'm going to digest and approve his quote in the couple of weeks from when he gets it to me...
Builder no. 3: doesn't even bother to respond
Builder no. 4: we'll see