Average cost for supply and fit of double glazing for a 3 bed semi (assuming standard casement pvc-u not sash windows or large bays) is likely to be anywhere from £5000 to £12000. Just depends on the size of the company/quality specification of the windows and fitting. A typical 'local family' glazing business is probably going to do the best cheaper job - fewer overheads thus more of the cost proportionally is for the windows and fitting. However you do take more of a risk of them going bust and if 'Uncle Bob' who does the fitting happens to be away when you need any remedial works done you could be in for a long wait!
If you want 'The Best' then the upper figure is more likely - but be prepared for a starting figure of £35/£40K before discounts - it just depends on the way the rep goes about quoting you I'm afraid.
Worst way you can do it is go cheap with a big company - overheads are greater so it's the quality of the product that suffers to get to the price. Many at present are 'underselling' and relying on the deposits to maintain cashflow. In 2008 250 double glazing companies were going bust EVERY QUARTER, and since then I can't imagine its got any better!
Anyway in my experience of dealing with similar projects such as you describe, I would budget for at least £75K to get a proper job done to all the latest specifications/building regs etc. Unless you know people in the trades who can do you some favours price wise.
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