BotusBuild

5ft long screw piles will not be long enough to make up your 1m. You'd need 9ft long piles to get stability IMHO (not a structural engineer). I'd be putting in some concrete piles (as per above) and building up from those. A builder friend of mine is sold on these screw piles, but did say they have their place for small extensions, garden rooms etc.

I was going to do the lot, but the ASHP install plumbers did the ground floor at the same time, then came back to connect and fill the upstairs for another £250. It was a good decision.

You could buy ours when it comes back. I see you're in Cambridgeshire and we're in Cornwall. I was thinking of making it a loan tool on this here hub

Which is why The Orange Man is trying to put a friendly government in to replace Maduro, oh, and pamper to the Russians as well, in order to secure a future supply for their gas guzzlers and overheated and overchilled housing and office space. And of course, cozy up to the murderers of Khashoggi. How does Israel fit in? Arms (pun intended) length "nuke 'em outfit" to keeps the Middle East in check

It seems they are on to this - More North Sea drilling to be allowed in new Labour plan https://www.bbc.co.uk/news/articles/c0r9gyjkky0o

Plastic conduit will be fine. Is the 45mm void just under the roof tiles? I would put the cable in conduit for extra protection.

Glad it wasn't just me @Jolo

We did the same

Nappy changes probably the biggest use @ProDave. It is easy to have a ready supply of wipes held together in a handy plastic (!) pack as you traverse this hideous job. Shouldn't happen (wet wipe use) but it does 🫩

Mine was a new connection

Or just a simple PIR switch

Retain and re-use the stone where you can if you end up rebuilding. We had to chop a walnut tree down. It is now our breakfast bar 🙂

Welcome and good luck with the conversion. I trust through top half of that internal wall is being replaced 😁

GIT mainly used in software development to hold versions or iterations of development, know as builds. Probably not useful in the OP scenario

There is a train of thought that says in a traditional two storey home (bedrooms upstairs), and depending on levels of insulation applied during the build, that you may not need UFH upstairs. The main question to answer so others can provide improved responses is about the level of insulation and air tightness of the build, and if you have the heat loss figures for the rooms upstairs. Also, what temperatures are you aiming to achieve in those rooms (generally bedrooms are cooler)?