In a nutshell.
6 months ago was in talks with a builder for an extension. Got a detailed quote, all was good. Unfortunately I then had a problem raising the funds, so had to postpone. But promised the builder that he would have the work and I wouldn't go elsewhere.
Fast forward to now. I got back in contact a couple of week ago, to say funds now all sorted, in my bank, ready to go. Lots of email exchanges, he came back today to sort final details. Got the revised quote through. The build cost has increased by almost £8000!! That's a 30% increase! Total before was £20k, now it's £28k. Apparently this is a rise in materials, but really?!
So, I can't afford to proceed now. He was meant to start on Monday.
I'm torn between anger and upset and frustration.
My knee jerk reaction is to get another quote (he wasn't the cheapest but I trusted him), but I feel like a right twat and like a time waster 
Any thoughts from anyone with trademen DH's? I'm worried about pissing the builder off but I literally can't afford his new price.