Thank you for your response, it was very relevant to my question.

The last project was over 12 months ago and the majority of purchases were done through the main builders merchants not wood merchants.

I was just trying to get some thoughts and some basic rule of thumbs before I start planning in any detail. As soon as I know what materials I'll be using then of course I can cost it but I wasn't intending to produce a quote only a rough estimate.

The whole point is if I find out that the cheapest bespoke kitchen would cost, for example, £30,000 and instead I could make it with a little sweat and blood, over no fixed timescale and to 80% the quality, but a quarter of the price with a full asset based workshop where costs can be recouped at project end, then I'll go for it!

Same with the windows. By the time I'll get round to it then the dust will have settled in the industry and the LA will know exactly what advice to give to which I can then work out a route based on the above theory.

I have no fixed timescale for the bulk of the building. It's not being run like a commercial project. I would rather it take 5 years of graft, learning and mistakes than to give the greedy bastard banks all my money for the next 25 years.