Thanks guys. I was kind of hoping I'd feel better about the tiles this morning but no, I still hate them. I'm so lacking in energy, though, that I can't even get upset about this. I'll swap them out in a couple of years time. Right now, it's a floor, and that means I can get appliances on soon, which I am absolutely desperate to do.
glorious - I'm so sorry you're having a down day. It's rotten (and anxiety-bordering-on-panic inducing when you suddenly realise a job is a load more expensive than you realised). I bet there is a way around it. Why do you need technical drawings - are your stairs very unusual? It sounds from what you have said as though you're just replacing the upper parts, which shouldn't require loads of technical drawings - you only tend to need those if you're doing the whole staircase?? Or have I got the wrong end of the stick?
What lines are you looking at? I found that there was a big cost difference between the parts that were standard (basically square and slightly champfered lines) and ones that had to be special ordered in. I went with a local shop round the corner from me, and newel posts, spindles, handrails, baserail and linings for the side of the stairs, all in oak, came in at around £450 + VAT. Fitting was £300. I was highly limited in what I could choose because our stairs are very raked, and this basically ruled out anything in metal or glass.
4years - Hmmm, you do need to be able to trust your builder. You really do; it's the most vital relationship. And I would always want a quote that was carefully itemised before starting, definitely NOT a guesstimate as that isn't really worth the paper it's written on. But you do need a contingency too. Is there any way that you could cut back on one or two elements of the design to give you that 10% leeway?