Kitchen side extension and front house external solid wall insulation requirements

[ManuSingh]

Hi

 

We live in a Victorian semi detached house in W13 London and are planning to do a kitchen side and rear extension. 

 

What I wanted to check is that does this project (assuming it falls under major renovation due to the surface area clause) automatically kicks in external 9 inch solid wall insulation requirements for the rooms in the front of the house (ground and first floor)? Or can we argue that the cost of the internal insulation required on those rooms does not justify the 15 year payback, as the annual saving by doing wall insulation based on the EPC report is only £284 annually (£4260 in 15 years) whereas the cost of internally insulating those rooms is in the range of £7000-£8000.

 

Thanks

[joth]

Have you looked into a green grant to cover the upgrade?  https://energysavingtrust.org.uk/home-insulation/green-homes-grant-scheme

 

[ManuSingh]

Thanks Josh, yes I am aware and applied for the same, but what I wanted to check is that does this project kicks in this requirement or can it be avoided for the time being from the point of building control.