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I agree it's a big jump especially after they've quoted £6k on the spot. It probably came across badly regarding the £4k, I just meant that materials alone on that project list could push near £4k, especially if they are adding 20% to materials which I know some building companies do.
If the list was organised more into a project timeline it would be easier to break down into components. I could see the electrical side being £1.5k, without a breakdown it might seem high but it's easy to arrive at especially as the trades are so busy right now. If you wanted it done in January you'd probably be getting keener quotes.
If you are looking for someone now to complete the work by mid August then it doesn't surprise me that you're getting increased quoted prices.
I think you were about right estimating £8k but you might find an extra £1k in additional stuff as you go along.
With the 3 appliances, 4k I appreciate but 12k? I was thinking 7k or 8 at a push. My main issue is the jump from 6k when he's there and has seen it to 12k + VAT on paper. If I discuss a job for someone and, so long as the requirements haven't changed, my discussion and final quote don't have a 100% disparity..