GARDEN ROOM PLANNING PERMISSION RULES [ENGLAND]: -
From October 2008 Rules governing outbuildings apply to garden rooms, sheds, greenhouses and garages as well as other ancillary garden buildings such as swimming pools, ponds, sauna cabins, kennels, enclosures (including tennis courts) and many other kinds of structure for a purpose incidental to the enjoyment of the dwellinghouse.
Outbuildings are considered to be permitted development, 
not needingplanning permission, subject to the following limits and conditions:
No outbuilding forward of the principal elevation fronting a highway.
Outbuildings and garages to be single storey with maximum eaves height of 2.5 metres and maximum overall height of four metres with a dual pitched roof or three metres for any other roof.
Maximum height 2.5 metres within two metres of a boundary.
No verandas, balconies or raised platforms.
No more than half the area of land around the “original house”* would be covered by additions or other buildings.
In National Parks, the Broads, Areas of Outstanding Natural Beauty and World Heritage Sites the maximum area to be covered by buildings, enclosures, containers and pools more than 20 metres from house to be limited to 10 square metres.
On designated land* buildings, enclosures, containers and pools at the side of properties will require planning permission.
Within the curtilage of listed buildings any outbuilding will require planning permission.
*The term “original house” means the house as it was first built or as it stood on 1 July 1948 (if it was built before that date). Although you may not have built an extension to the house, a previous owner may have done so.
*Designated land includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.
IN SCOTLAND AND WALES: -
you will need to apply for planning permission if any of the following cases apply on the land around your house.
You want to put up a building or structure which would be nearer to any highway than the nearest part of the “original house”, unless there would be at least 20 metres between the new building and any highway. The term “highway” includes public roads, footpaths, bridleways and byways.
More than half the area of land around the “original house” would be covered by additions or other buildings.
The building or structure is not to be used for domestic purposes and is to be used instead, for example, for parking a commercial vehicle, running a business or for storing goods in connection with a business.
You want to put up a building or structure which is more than 3 metres high, or more than 4 metres high if it has a ridged roof. (Measure from the highest ground next to it.)
If your house is a listed building, or you live in a Conservation Area, a National Park, or an Area of Outstanding Natural Beauty, and you want to put up a building or structure with a volume of more than 10 cubic metres.
Note: If your new building would have a volume over 10 cubic metres, and come within 5 metres of the house, it would be treated as an extension and would count against your overall volume entitlement.
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