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Thanks for getting back to me. Foundations are fine as the builder made them to accommodate two floors (ground and first floor) just in case, this has been confirmed by building regs. Okay, I have an 80mm cavity, would I be able to put 50mm PIR in there and leavr 30mm air gap. Would building...

Did consider roof replacement but got a mate that's a builder who is gonna help and he estimated a similar cost. Yes blocks for the wall, have a inner and outer leaf of hollow blocks with 25mm PIR up to about 3ft atm. So hoping to continue the cavity up. Hoping to upgrade the insulation in the...

Yes I know, that is why I'm asking with the air space in the cavity. Will try to get hold of the council's building regs department today. Just a thought I got last night, thought someone on the forum would have an idea from past experience. Thanks

Yes habitable, at the back of our house. We had a heater in there so will use that. Why do you ask?

Just a regular room so it'll be warmer in winter and cooler in summer. Block walls and then a slate roof.

Hi, I have just taken down my conservtory which was built on top of a cavity wall which has an 80mm cavity. Currently the cavity has a 25mm PIR board, but due to the new building regs I was thinking of upgrading this to 50mm PIR to get closer to the U-Values. Would a 30mm air gap be sufficient...