Mr Punter

Thanks for the update. I hope you are soon recovered.

With water consumption, we normally fill out a spreadsheet with the proposed fittings and their maximum consumption. Does not require a legal agreement.

Well that is great news for your project. Although you may find siblings tricky, at least they know your foibles and are not such a PITA as contractors can be.

So when you say all the openings are the same, do they all have a crack running down from the bottom left / right edge to the floor? Nothing at the top? Ground and first floor?

Won't they deliver to you?

No someone has messed up. Using mesh internally would be unusual.

Bifold doors tend to suffer from the issues you have experienced. I am not keen on them. I have had bifolds in the past and would not again. Lift and slide is my preferred option.

I agree. Far from a shitshow this is barely a skidmark.

I have often had to reduce some wall heights or taken down sections built with wrong DPC. You should be able to reuse the Marmox, which is good considering the price! Ground bearing slab is nicer in the winter as you don't have freezing air circulating underneath. So is it MOT, gas membrane, concrete, insulation then screed or are they in a different order? Either way I can't see too many issues that can't be worked around.

The circular columns are great.

They often set the levels with several small tripods and work to them. That way they don't need the laser level and staff/receiver while they are pouring.

Structural warranties are a bit strange, as the cover is often for 10 years with a one-off premium. Rebuild costs in 10 years could possibly double so it is difficult to judge what level you would need.

Threshold details are a right pain. I guess he is concerned that there may be cracking between the different substrates. Who knows if he is right? I guess you either do as he asks if he is willing to take responsibility in the event of it being defective or you leave it as is and you take the responsibility. And maybe stop wearing stilettos around the house.

I think you need to increase the cover. Sadly it will probably significantly increase the premium.

A photo would be useful. Mostly sinks are supported all round, either by kitchen unit carcase or by worktop.