Roundtuit

Has the doorway been moved? Looks like there is no significant lintel/support over the opening, so perhaps those struts are to stop any movement of the vertical steels around the opening.

Maybe the opposite. Our frame came with PIR factory-installed; very tight and accurately fitted, and foamed in for good measure. I'm pretty sure they weren't geared up for a rockwool or cellulose solution, so the job would maybe become less appealing for them if that was the choice.

There's a +5mm tolerance on the PIR boards, so I wouldn't attempt full fill.

Typically I think 140mm studs are filled with 120mm PIR due manufacturing tolerances, then we lined with another 40mm. I'm sure there are other rockwool/cellulose options you could look at with 300mm to play with. A 50mm cavity between frame and outer skin is required if you have masonry I believe. Mixing insulation will probably need some sort of condensation risk doing to avoid a dew-point in the wrong place.

Minor set-backs my friend! Seriously, I'm sure half of us have had that 'wtf did I start this for' feeling when waking in the small hours soaked in sweat and dreaming of -insert current snag here -. It's hard to keep perspective when it's your life/money/sanity, but it will be worth it when it's finished and the PTSD subsides 🙂

Anyone wanting to reasonably accurately calculate rebuild costs surely?

Maybe. Depends on why your house needs rebuilding, but I don't think it's an assumption you would make when calculating reinstatement costs.

Plus plot clearance and any additional costs associated with a brownfield site. Assuming the key requirement of a reinstatement cost is for insurance purposes, I wouldn’t want to estimate on the low side. It might not make a huge difference to costs as policies tend to have an 'up to' limit in quite broad brackets. I know for sure that if I had to rebuild my place I would not be hands-on again, so insurance would need to cover a builder and their profit margin.

Come on; stop beating around the bush and say what you think 😄

Bespoke, so they can build what you want. About 18 months ago, the frame was just under £19k erected, and included timber for studs, joists and cladding, but it is quite big: effectively 3 bays plus wood store each end, and storage space up top. Still progressing at a snail's pace as a 'spare time job', but looks more like this now...

Oak frame kit, delivered and erected in 2 days. Finish at your leisure via trades or DIY!

Don't forget to factor-in a ventilated cavity behind the cladding.

Have a look at profilestore.co.uk, ventilation profiles. They do flat or angled in black at good prices. I bought some recently for proofing some cladding.

This suggests that the law may be on your side... https://www.moorebarlow.com/blog/can-a-neighbour-erect-scaffolding-on-your-property/

Scaffolding aside, are they going to need access to actually build ie brickwork/pointing etc, or can it all be done from their side?