Rules, known as ‘permitted development’ rights, allow you to extend a house without needing to apply for planning permission if specific limitations and conditions are met.
If you want to exceed these, then it is likely that an application for householder planning permission will be required.
If the work adds over 100 square metres of floor space, it may also be liable for a charge under the Community Infrastructure Levy1.
A planning consultant may help with the smooth running of your project. To find an accurate consultancy quote, explore Studio Charrette's calculators2.
Build Aviator's estimating service can help you plan your project by providing an accurate cost of the proposed changes. Find out more3.
These rules apply in the context of the proposed extension and any previous extensions (i.e. the ‘total enlargement’).
These rules apply to houses only and not to:
- Flats and maisonettes (view our guidance on flats and maisonettes4).
- Converted houses or houses created through the ‘permitted development’ rights for:
- ‘Changes of use’ (Schedule 2, Part 3, Classes G; M; MA; N; P; PA and Q) (as detailed in our change of use section5)
- ‘New Dwellinghouses’ (Schedule 2, Part 20)
- Other buildings.
- Areas where there may be a planning condition, Article 4 Direction or other restriction that limits or removes ‘permitted development’ rights.
These rules summarise the text of Schedule 2, Part A, Class A of the The Town and Country Planning (General Permitted Development) (England) Order 20156 (as amended7).
Detailed advice on complying with these rules, illustrative examples and further explanations of the terminology used is provided by government in the ‘Permitted development rights for householders: technical guidance8’.
You are strongly advised to read this guidance to help understand how permitted development rules apply to the specific circumstances of any proposal.
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