Mr Punter

Ask the SE to just do 100mm concrete slab onto compacted MOT. Why is it reinforced? You can then have insulation and 50mm liquid screed or 75mm traditional screed.

Materials alone will be an extra £150/m2.

I would want the £20,000 back.

I can't see a slate DPC. I think it has been buried. The paving looks like it could be above DPC level and the wall may be getting wet from rain splashing up. Can you lift a slab and investigate? The solution could be to put an ACO type channel drain along the wall.

You need to determine the depth and route of the sewer and the extent and depth of your proposed extension foundations. Show this on a properly scaled drawing. If there is a clash, you may be able to deepen your foundations locally or bridge over the sewer. Diverting the sewer would be a last resort.

+1

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LPA don't make regular checks during construction. The full extent of the breaches may not have been apparent until the scaffolding was down. Even if they had LA building control, they don't care what the building looks like, as long as it complies with Building Regulations. The LPA will normally only act following a complaint, unless it is clearly obvious that the development does not have the correct planning consent.

I am doing similar but need an extract duct hole. The floor is in place and I plan to drill through the ledger but if it is a pain I will chop a section out with cordless circular saw.

It makes no difference which way the below rafter PIR goes. Do whatever is easiest. You can tape the joins instead of full VCL. You will need some fairly long screws to hold the service battens in place. I guess the rafters are only 125mm deep.

Above or Below may be better to avoid confusion.

I don't think that a mechanism exists where the developer can be fined, other than for not complying with an enforcement notice.

Forget the readymix, just a couple of tonne bags of ballast and 12 cement needed. How is the rebar fixed to the posts? Make sure it is 32 or 40mm. Ducting between posts for automation. Be good if the posts were galv.

It should be fine to walk on. A dry ridge / hip setup may have been better as it does not rely on mortar joins. Maybe the battens and / or rafters are rotting? Can you see it from the inside? Any daylight?

If you submit your appeal near to the 6 month deadline it will probably be over a year until the Planning Inspector sees it.

There are firms that will cut and bond the bricks to your spec and not a huge lead time.

I think A looks better. A very well fitted VCL under the joists will prevent warm moist air getting into the roofspace. Don't ruin it with a load of downlights lashed in.

You could do external wall insulation and painted render. I think it could look good.

If you have a properly designed and installed type c drained cavity waterproofing system the room would be dry. It requires the membrane on walls and floor, a perimeter chanel plus a sump / pumps if you cannot drain via gravity.

Use concrete blocks to hold down wide DPC over the cavity. It will all dry out eventually. If it got really soaked, could you drill a few holes at the bottom of the wall?

Larger sand content will help it drain, as long as it doesn't form a sump you will be OK. Backfilling with clay is tricky as it does not always want to compact nicely. You could end up with a 30cm strip of bowling green lawn!

I have some flats in Conservation Area. All electric mostly small single occupancy. The EPCs are confusing. The top recommendation is internal or external wall insulation at a cost of £4,000-£14,000 each. With the lower figure it would take 30 years to pay back, with the higher figure 106 years. They liked to recommend high heat retention storage heaters and dual immersion water heaters. The flats are mostly D and E. One from end of 2019 recommended gas boiler. Most are out by a fair bit in floor area. Pretty crappy system IMO.

It would look neater if it was filled and painted but it shouldn't hurt as is.

Can you put some compressible insulation around the pipes where they pass through the 2 layers?

The cost for heating and DHW for a 5 bed house are fairly small compared to other costs, like mortgage, school fees, holidays, pensions, food, travel / car. Maybe energy costs on a crap house is £4k a year and a good one is £1.5k. On a £750k purchase it is not such a big deal.