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.
You will need local building control officer approval - I would expect
them to be quite interested in how you are planning to tie the new walls
to the existing ones and the foundations for the new walls.
Planning consent is another matter. If the external appearance is
changing (eg exposed brick instead of rendered block), you live in a
National Park, you are going befyond the building line, etc, then you
may well need Planning Permission.
The simple answer is to discuss this informally with both offices at the
earliest opportunity. I have found them very approachable and helpful at
how to get what I want within their rules. There is no point in putting
this off - it will have to happen, sooner or later.
However, if you do something without consulting them, it *will* be
reported. The whole country has people with nothing better to do than
phone and complain at the first sign of a change. And, if they require
that the foundations are 1" thicker than you allowed for, it could be
rather expensive to put right..
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