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Have a look at this: http://www.planningportal.gov.uk/permission/responsibilities/planningpermission/permitted
Assuming you develop less than 50% of your overall available land and it falls within the size / height & placement guidelines, you can do what you want.
Edit: Here's a better link: http://www.planningportal.gov.uk/permission/commonprojects/outbuildings/
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if it's under 2.5 meters tall then you shouldn't need planning, unless you put a satelite dish on it. Likewise as it's not a habitable space, as in it's not in constant use, then you shouldn't even need building regulation approval. Although if you run any electrical cables or put in extra drainage etc then you will.
http://www.thegardenroomguide.co.uk/building-regulations-for-garden-rooms/2012/08/18/
"You don’t need Building Regulations for a garden room if:The internal area is less than 15m2 If the Internal area is less than 30m2 and is not within 1 metre of the boundary" -
(Presuming that the current shed doesn't fall within Permitted Development criteria).
As the shed has been there for more than seven years the Planning and Development Act 2000 has a statute of limitations which means that your Local Authority can't issue enforcement proceedings as more than seven years has passed.
However. If/when you come to sell a solicitor will be looking for the correct title on the property which includes a compliance with planning permission certificate, which you won't have.
To get this, you'd need to apply for retention planning permission. There is no guarantee you'd get this. If you have no plans to sell you could therefore ignore the requirement to obtain retention planning permission, as there is no danger of the LA attempting enforcement action.
If it does fall within PD criteria then what Soul/Sumo said.
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Previous owner installed a fairly substantial (wooden) shed in the garden about 20 years ago. On the various documents it says he's supposed to have notified the council. He says he didn't. I'd like to build a new shed in its place. Ideally brick with one side of it as glass windows to use as an office.
The fact the current shed has been there for 2 decades, in a concealed space at the end of a garden overlooking allotments (not blocking views either of the allotments to the north or the sea to the south) makes me think I would probably get away with it. If I don't, what's the worst case scenario? I have to tear it down/pay a fine etc? What happens in these situations?