Garage conversion insulation

[Neoc]

Hello Friends 

 

post my previous post on the build over agreement for a garage conversion to a en-suite bedroom, wanted your inputs on the insulation for the garage. Attached pictures are of the external wall, what kind of insulation would be cleared by the BCO as I want to explore if I can achieve it with the minimal usage of the floor space. I will be discussing with the BCO tomorrow and want to be prepared to have a conversation.

 

Second point - I am thinking of demolishing the existing porch and create a new one. Have 2 questions on it:

 

I have the planning permission of around 2.5 sq mt, can I go till 3 sq mt and breach the PP

 

As the porch is already built, what would be the insulation requirements and the size of the walls + insulation as I need to make sure if I am going ahead with 2.5 or 3 sq mt, I am not losing space due to new regs and I would then keep it as is. The reason for the new porch is new build and style vs the old one which was created decades back.

 

attached are the pics, happy to share more info pics if need be

[Neoc]

More pics