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It won't make much difference. I have the Wunda system and the heat is spread well.

Don't you need to comply with 2m minimum headroom above existing stairs/landing?

Our builders are proposing to use a contractor who uses spray-on coloured cork render, presumably: https://corksoluk.com/ Anyone got any experience / opinions on this? It's the first time I'd heard of it

So you refused to sign a PWA with your neighbour, insisting instead that they pay for an expensive surveyor, then refused to temporarily take down your fence so they could access the side, and now complain about unsightly block wall? Sounds like the consequences of your own actions to me

If your radiator was the same temperature at the inlet and outlet it wouldn't have given out any heat to the room!

Truss clip? https://www.toolstation.com/galvanised-truss-clip/p77044

We had exactly the same situation as you - part suspended, part old solid and new solid extension. We went with a low profile system (~20mm build up) throughout. As mentioned, it works differently to "conventional UFH", more like the fast response and low thermal inertia of a radiator, but it...

It would be the third floor, but the block would become four stories

Only took 3 months!

This is what I did with my sectional concrete garage and it worked perfectly

Don't let them use PVA. Honestly I think you should tell them to get someone else in who knows what they are doing...

Carpenter to box it in.

But you don't know if that would be the case for your quote or not. He's said it is (currently) 15%, if his material prices increased then maybe he would have reported it as 14%

As I said earlier, my builder accidentally sent me his internal costing sheet. His overheads were calculated by line item and summed up and converted to a total % value that was then distributed over each line item in the project. He didn't directly send me his breakdown but it would have been...

What exactly do you think overheads are? He is not pocketing that money, it is spent on costs of running the project.

Your house isn't rendered, so it would look pretty weird to have a rendered gable end... Hung tile on timber frame or brick (unrendered) would be allowed under the permitted development rules from my understanding.

It is unusual for a builder to send their you cost breakdown like that, but mine accidently sent me their internal spreadsheet for our loft conversion. From memory it had about 10% overheads (project management, QS, skip hire etc) and a 15% profit margin.

No, you are mixing up kW and kWh (a kW per hour doesn't make sense). Your boiler will, presumably, modulate somewhat too. What are you hoping to achieve with these calculations?

It's normal and nothing to worry about

Multitool with oscillating blade?