vik2001

This is correct. I'm going 10 m in length behind the garage, which is longer than the 4m allowed for a detached house under pd.also the roof height is greater then 2.5m so doesn't come under pd. I decided to halt work. Only the block n beam floor has been laid. Similar houses in the street have had extensions done and the neighbour has no objections in me doing this.

it's 10m in length and. It's 4m wide

What happens if you build a extension and have building regs but no planning permission? Here's the story: Doing a 10m side extension, got building inspector involved and all going good with foundation etc. Extension is about to go up and we been told it doesn't come under PD. Do I carry on with extension(neighbours have no issue with it) or stop work and apply for planning permission The walls have been knocked out so I'm in a pickle. Current wait for applications is 3 months I'm told. The side extension is being done along side a Garage Conversion to convert it into a habitable room.

I did think as well the block and beam floor needed to be lower, and raised this with builder. But there's a sewer pipe that runs through the garage that cant be touched without smashing garage floor. This is directly below the block and beam floor, so if the beam floor was lower it be at level of drain pipe

See attached the block and beam floor, and you can see the existing house past the acroos. I dont have much height to play around with. Once I put the pir boards on the block and beam what can I put in top that doesn't increase height. Ideally I want to overlay with ufh boards everything

I'm doing a extension where it will join into the existing floor in bungalow which is just a slab of concrete. I want ufh throughout. NEW extension is block n beam concrete floor which will have 100mm pir insulation. The old bungalow is concrete with no insulation. Builder is saying he will add 20mm insulation to existing concrete so both floors match up, and will add overlay ufh board floating over the pir insulation in the extension and old floor. Then lay a floating engineered oak floor on top. Can the ufh overlay board be left floating over insulation board ?