Mr Punter

There is a fair bulk of screed there too. If you can chuck it down for the base of a road and track it in it may be better than muckaway. Is the blue stuff another layer of insulation?

I have used some of the industrial aluminium stuff where they use a machine to zip the panels together onto halters fixed to the roof deck. This was supply and fix.

Hello @Thorfun. An acre is a good size plot. There a quite a few members in Sussex. I am a developer rather than self builder. @sussexlogs has a blog of his build here. He is more hands on than most.

I have used the Airflow Icon fans in this situation as they can be switched individually and have different controllers (delay start, humidity, pull cord etc) depending on requirements. They have an iris that closes when the fan stops so you don't get air from the other fan on the same duct run.

We have triple glazing and either toughened or laminated inner and outer panes. We are in town and mid terrace. You could break in with a decent size excavator though!

I hate alarms. Maybe a good idea on a not-so-secure building site but there should be no straightforward way of breaking in to a new house. Almost always false alarms, caused by user error or alarm fault. Car alarms are even worse and it is often low value cars that seem the worst culprits.

I can see no reason why the left side would be the principal elevation unless the building is effectively 'side on' to the red dotted line you have drawn and the wall abutting the dotted line is a secondary or flank wall.

You can't move the service head = where the mains cable comes in - yourself. You need to locate it somewhere it will not get damaged or failing that, have it disconnected, then a new service routed later.

I am pleased to note you blamed the kids first. Well done, that is what they are there for. Blocked drain below ground can cause issues. Lift a cover and have a look.

Well @jntabbycat I would be really interested to see the plans and sections for this when they have been worked up. It looks like a fair bit of this will not be timber frame as per your detail but the door and window. The corner post will need to be structural. Be good to show the external paving level, as on the SketchUp it looks level with where you have the sole plate.

One of the firms @Temp linked to above does reclaims http://www.matclad.co.uk/sussex-press-reclaim-230-x-71-x-20mm

Mostly I see the blue pipe just coming into the building, then a stop cock, then copper.

Well that is going to be a heated site meeting with the boss of the firm. Can you get someone experienced who does not take any s**t to accompany you? It looks rough to me but I don't know what an acceptable standard is for this stuff.

Because the land is (I think) the garden of his main sole residence.

Good grief!!!

You can sell the plot(s) with no liability for CGT and pocket the cash.

2 nozzles if you don't use it all at once. Because it is not pre-mixed it keeps OK. They sometimes have a screw cap as well. Yes, grind away!

The 2 part resins set pretty fast. Don't spend more than 5 mins on each fixing hole. Some of the resins use a standard mastic gun, so these may be better for you. Make sure you clean your holes!! Squeeze the resin onto some scrap card until you can see that it is mixing properly in the nozzle. Insert the nozzle deep into the hole and squeeze the trigger as you withdraw, so the hole is about 2/3 full. Turn the studs anticlockwise as you insert them. It is quite satisfying to do if you are fixing something simple.

I get this often. Lots of firms decline to quote for stuff, unless you go through, say, an expensive architect or engineer who the seller / contractor wants to keep in with.

Flow rate is not pressure.

Yes but I don't know if it will solve your problem. (any of them).

Pressure reducing valve?

I used them for a project with about 100 windows and doors - 280m2. They were OK. I would take what they say at face value - they are too busy to want to quote on your project.

I would set the cill at 450mm from FFL so you can use it as a window seat. The window as drawn looks a bit wide and squat.

From your photo it looks possible that you may have asbestos board around the existing window. You can get it checked really cheaply and it will give everyone peace of mind. Some can be removed DIY and some is v. dangerous.