Thanks all, good starting advice. I’m looking at SIP’s for the build, and very much passivhaus standards in terms of being “green” rather than just fitting LED lighting and water saving appliances!
I think I’ve already decided that given the spec of the house I’m hoping to achieve, GSHP would be a waste of initial outlay, (but can you really not plant a bush or tree above the pipes??)
I’m hoping I can be convinced that ASHP can do what I want efficiently. I understand the convenience and minimal cost of it but I really don’t want to install gas. It’s one service I wouldn’t need to pay for install, the government are scrapping it from new builds in that not too far future, and I’d like our energy to be from renewables. I plan on solar PV on the roof and already use a supplier that is 100% renewables. Yes my gas is currently carbon offset but if I can ditch it’s use altogether, then that’s better for me.
My current cottage is tiny (not sure exactly of the top of my head), and it suits me (despite having to keep a lot of my tools and equipment in a storage unit miles away) but it’s not how I would like to being up my children if I can afford not to. I’ve got each of the rooms down to what I think is the smallest they can be comfortably, I don’t see the point in self building if I’m going to compromise to such an extent where I cramp things in and force the kids to share rooms growing up. I may as well buy something already built and save myself the hassle and work! Although, if when I get to the point of showing my drawings to an architect he can show me a way of shuffling to save space then I would of course be open to it.
We need a workshop as we often work from home (one of us will be full time once we have children) so included in my estimate of size is a garage and a workshop along with a disabled accessible guest room with en-suite for the MIL who may well become a permanent resident.
I guess my point is, I’m building for the future and don’t wish to grow out of the house, I plan on building green also in the sense of sourcing locally, choosing materials wisely etc to minimise impact there.
Does anyone have a good source of information on the different types of foundations? I know the plot etc will affect what can be used but I’d like to understand all the different options.