In England and Wales you will not usually require planning permission, provided you do not exceed the permitted development limit for your property (which is 50-70 cubic metres, depending on where you live). Notable exceptions to the above are listed buildings and conservation areas. Please note that if your property has been extended in the past – you will have used up some or perhaps all of your “permitted development” area and may need permission. Its also worth noting that occasionally “permitted development” rights may be withdrawn from a property and any extension however small needs planning. If in doubt check.
Under new regulations that came into effect from 1 October 2008 adding a conservatory to your home is considered to be permitted development, not needing an application for planning permission (subject to conditions). For further information please visit the Government’s planning portal online by clicking here.
Generally speaking conservatory/sunrooms on residential property are exempted under Building Regulations. Below are some of the Exemption Criteria – under the Building Regulations 1991 (as amended). These criteria must be met for a conservatory extension to be classified as exempt: