I've got 10 or so double-glazing units that need replacing. They're 20 years old and getting condensation on the inside (some worse than others). Once the first one went, I thought I'd wait for a few more to go and make it worthwhile getting someone in to replace them.
I've duly had two quotes. There's a £500 differential for the 10 units (~£800 vs ~£1300), so that's £50 per unit. As far as my untrained eye can tell from the quotes, there's little difference in the materials (both class A, low E, argon filled). I don't mind paying for better quality (I'm drawing an analogy with cars: different car, different price, but it's still a car, you get what you pay for, to some extent), but I do mind paying more money for the same thing.
Is it possible for there to be such a differential in what to the untrained eye seems a similar product?
TIA