I am learning as I go!
I do like the idea of pinning down the detail and now better understand the gaps in what we've provided. I'm minded to plug some of those gaps as I feel I don't really have a builder I can trust entirely just to get on with it in good faith.
Strangely, the guy that did the building regs drawings and structural calcs has taken offence at me now indicating I want to get some more detail together, like M&E drawings. Whether or not he can/cannot do them, he reckons the way I have asked about extra drawings and detail and checked in with building control represents 'a breach of trust'. I am baffled. I don't know what to say to him other than that I am happy with the drawings I have and am now looking to develop some more to get my precise costings and help the builders with the detail. I don't know why his nose it out of joint.
The project manager guy I mentioned earlier in the thread who would run it through BuilderTrend is going to quote using Build Aviator and has asked me to pay for it, which I am happy to.
I had one quote back so far, which was more than expected, and with many elements not pinned down. I hope some others are closer to my expectations. (£145k was the indication from the calculator for what is a 84 sq m two-bed property built in conventional brick/block, with a beam and block ground floor. First quote was for £166k but leaving out windows, services and some other elements.)
Is £7.5k for a basic staircase from ground to first floor clearly over the odds? Nothing special, just softwood standard construction. That was one quoted cost that jarred with me at first glance.
Thanks for insights so far. Very useful and much appreciated.