Many thanks for such an insightful and comprehensive answer.
Definitely the pros and cons list is a great idea. A self build is out of the question really unless our budget was a lot higher for the area that we want.
On our last house, we did a direct labour extension which I was very involved in so I know the work involved. I did enjoy it at the time but I know it was stressful too.
The new build fits our needs adequately but I do feel it’s a bit over priced. But then we got a good price for our house so swings and roundabouts I guess!
There’s not much on the market for us at the moment which is probably rattling us a bit also.
We’ll just have to see how it plays out. Bundle of nerves till then!