Oz07

I'm also terrible at wet trades. I think a lot of the skill is getting consistentcy of the mix right whether it be mortar, adhesive etc etc

I find a bucket trowel easier to throw dobs on.

You can if everything is in course. I've done it myself before ontop of b&b with a spine wall. You just lay ontop of the membrane

This is what I am asking why cant it be done like this? Think @ETC is saying similar?

Mix a blob of adhesive up, dab a bit of board on and try to get it off in a week. No prep required usually. If excessively dusty give it a brush. I certainly wouldn't be wetting it immediately prior. Might be hard to dab the boards to a straight edge

How deep can these radon membranes go. Is there any reason they can't go flat below the insulation layer and just end up with membrane spanning the whole envelope of building. No corners etc. Any spine walls laid on top.

No brainer then I'd have thought. What's cheaper a system boiler or ashp? What does your estate agent think buyers would prefer?

I still don't think penetrations in the main fire stop ceiling would be good. Probably have to fill the gap between board and light with intumescent mastic. What about standard pb double boarded. 15mm if nessecary.

The building in question already has permission to demolish from current approved planning. That's why I can't see how they could require a new survey as you could knock it down currently on existing permission.

Without side tracking the thread. If you already have had a survey confirming no bats how long is it valid for? Could you use it on a fresh application within 6 months/1 year/2 years etc or does it always require a new survey? In which case cheaper to demo roof pre application

How thick are these led lights? You could just fire plasterboard the whole ceiling, filling joints if needed for fire regs, then fit your lights and standard plasterboard underneath. Maybe some battens sandwiched between if you need the depth for the lights. Make sure joist and truss manufacturers allow for the extra dead load on ceilings.

How much is your gas connection? Where i am the quote is normally in the hundreds not thousands. Like @Mr Punter I'd be wary of solar and heat pump on a spec build. Your house won't fetch any more money for having pv. They can always retrofit this themselves if the calcs work for them. Or do you need it for SAP pass? Same story with the hear pump. You won't realise any more money for fitting one so just weigh up what is more expensive to install. Like @Mr Punter says you may in fact have some customers put off by an ASHP. It doesn't sound like they have a good rep round your way and the average punter is not going to be interested in visiting buildhub to find our how good they can be if they already have a negative perception of them.

Why is this any different to a normal gable. Some straps off the timber at the top of the wall built into the inner leaf. Job done. Why complicate it? What am I missing? Some wall start ties tek screwed into that steel post if advised by se.

Ok I was only counting above dpc. Not sure on the rates down there. So you've got more like 9k bricks so around 7 grand plus 550m2 blockwork so around 11 grand. 18 grand plus a bit for extras lintels etc. At this point your best efforts are spent finding some trades people. Pop in merchants get prices for your gear, mention your looking for some brickies. Just get the word out.

The 45k over price is a not interested price just forget them. Keep trying to find people you have a connection to. Building is quiet atm