I have a single storey kitchen extention attached to my house. I believe
that it has been there about five years. I want to increase the wall
thickness using brick and insulation on the outside. I will also have to
increase the roof thickness/size to accomodate this. The question is do I
need planning permission to do this. I am not sure that there is planning on
the existing building, I believe that if the existing structure has been
there for over four years, planning is not required.
Your help would be appreciated.
Best regards.

In message , Piperson.
writes
I have a single storey kitchen extention attached to my house. I believe
that it has been there about five years. I want to increase the wall
thickness using brick and insulation on the outside. I will also have to
increase the roof thickness/size to accomodate this. The question is do I
need planning permission to do this. I am not sure that there is planning on
the existing building, I believe that if the existing structure has been
there for over four years, planning is not required.

Would your local BCO not be a good first place to ask

--
geoff

The question is do I need planning permission to do this.

There's not enough information to determine this. It may be a permitted
development. You need to contact your local planning department.

Christian.