Mr Punter

The difficulties are your income and lack of capital. However you finance this, if you aim to retain the property it seems you will need a mortgage / loans of £650k with an income of £85k which is 7.7 times income. I doubt many lenders would go more than 5.5 X. With only £100k of your own funds and no experience I can't see the construction being possible to fund either.

Will a can of expanding foam not fill that? Bear in mind that if you use it you will struggle to get to any of it later. Also it can push stuff about as it expands.

+1

If it is not fixed the contractor or supplier can just remove it if they are owed money. Once fixed, they can't (legally).

I have not seen that as a planning condition before. It may be worth looking at the council website to see applications from a year or so ago that have the same condition and copy what they submitted? Intellectual property theft is the sincerest form of flattery.

What do you need this for? I ask for risk assessments and method statements from our subbies, for health and safety compliance.

I send a window schedule so there is less chance of confusion. Makes it easier for them to quote.

I suggest just extend the living room. Straighten the wall in the kitchen to increase the WC into a shower room. Use the under-stairs cupboard to access part of the garage as a utility / coat room. Like this:

Which way is North?

If you cannot afford the VIPs, 40mm PIR will give you an extra 50%, so like having 60mm EPS. 50mm PIR would be like 75mm EPS.

If you have the money you could change your EPS for Kingspan Optim-R which is a vacuum panel insulation board. The 40mm thickness will be equivalent to 195mm of your current EPS.

If you want that house to be on Play School you will also need a round window!

Yes. Submit the same scheme but include the offer to pay the environmental scheme money. It sounds like you are pushing at an open door.

Cheap adhesive from a mastic gun just to hold the insulation in place. Tape the joins. Pre drill the battens so your chosen plug will fit through. Drill through all. Fix the whole lot with long screws into plastic plugs.

The market looks overvalued at the moment, but unless we see a rise in interest rates it may stay that way.

The PWA can be a bit of a gravy train and you are the one who will be paying. If both surveyors need to discuss this and draw up an addendum award it could prove quite expensive in fees. Politely point out what you have said here. Maybe get a hose on the stuff before you drop in down the chute.

I have used natural slate tiles. We did adhesive and mesh on the insulation, then the tiles. Butted up with no grout.

It is most likely that the washing machine is only connected to the cold water, so it should not deplete your hot water tank.

Celotex / Kingspan / Xtratherm style foil faced boards, joins taped with self adhesive aluminium foil tape as a vapour control layer. https://www.toolstation.com/aluminium-foil-tape/p81953

+1 to the 50mm taped PIR under the rafters. It really cuts down on condensation risk.

Yes, that is a bit strange. They are both DOVISTA. I got a quote from Velfac in November. With Rationel they referred me to a distributor.

I like sand cement and lime.

I assumed he was connecting the chicken shed.

That looks good but complex to build. The detail where you have an external terrace above the dining area will need careful consideration.

On site surveys the numbers with 3 decimals are the height (normally) above ordnance datum (AOD) - which is a recognised benchmark height based on mean sea level.