Mr Punter

I last had one carried out 10 years ago for £720 + VAT. It was only the impact on nearby properties. I can PM details if you want.

Yes that intumescent paint is horrible stuff. Goes yellow and seems to encourage rust.

We asked for this from the seller of a plot, where they had already got outline pp. The whole area had similar non development covenants dating from the 1930s but were never enforced. They are often used during development / sale of new estates to protect the sale values.

I don't really see much expanding foam on Velux. Normally rigid insulation and plasterboard around the reveals.

It is a shame and I can see why you are disappointed although most people would not notice and it will not affect the performance of the roof. You appreciate that this is a total pain to remedy - it is not a bit of minor snagging. Would you consider a reduction in the cost would be a sufficient remedy?

One issue will potentially be the weight of the stone slips on a timber framed structure. If you are doing rainscreen cladding on a timber frame you need a minimum 25mm strongly vented air gap between the sheathing and the cladding. I think you should be looking at a proper system with BBA approval.

You could run the last bit in 150mm pipe at 1:150 if the connection at the sewer end is sufficient diameter.

This looks like water running off the paving into the channel. Can you cut a wider channel and fit an ACO type channel drain?

I am not a great fan of external floor level the same as internal FFL. Possible damp problems. Externally you need a bit of cover over the drains but on your drawing they could be run just under the external slot drain. If there is any way to avoid a pump station - even if fall is reduced to 1:80 - then do that. Is this Polarwall icf?

It is worth bearing in mind that @nod is a seasoned contractor /developer who works very hard and efficiently and has lots of contacts as well as free labour from family and friends, so don't for a moment think you will get your project completed for anything like he can. For normal humans in the South East, £3-3.5k / m2 seems about right.

How did the water get there? Was it through ducting or pipes or does it just force its way out of the ground? I would hope your floor level is much higher than external ground levels.

Part M is for new dwellings. As long as you don't make yours worse you are fine. I would be wary about a drain blockage allowing water into the flat in heavy rain, so a decent threshold would be my choice. A circa 150mm step up or over the door threshold would be good.

I doubt this would be noticeable once the carpet and underlay are down.

Good result. Will they need to trim the studs so they are the same height as the others?

Surely you have access to an engineer to design this type of work?

It is a shame, but the sole plate may rot out very quickly with the detail that has been built. They need to remove what they have done on this section, build up the masonry, then reinstate.

No consent needed for a WC.

Please don't take the gutter downpipe across the flank wall at an angle. Straight down and connect underground. 40m is a long way to go to the loo when it is cold and raining. Have you costed running a 110mm drain and a 20mm water feed? It can all go in the same trench as the electric.

I don't think building regs testing will apply but if the council have imposed a planning condition, you will need to satisfy it or you may not be able to occupy or sell on. Can you ask your sound test people what they suggest?

Mortar will work OK. I struggle with the gun sometimes as they can block and make me rage. Other times they are fantastic. 5mm is very narrow so a trowel may work better.

Pretty crap plastering. He shoudl have chucked on a few more bags of hardwall and ruled it off with a long straightedge or speedskim. It looks like he has just skimmed it.

Good for you. It will drive you crazy otherwise. A while ago I sent back 8 panes of 25mm thick laminated toughened glass because it was not the specified low iron and I didn't like the green tinge.

I would have thought that any laitance would have worn off through foot traffic and cleaning and your plan seems OK.

It is expensive, heavy, difficult to cut, fix and finish and you don't get the benefits of impact resistance and pull-out strength where you would on a wall.