Permitted development can provide a simpler route for some home extensions, but it is important to check the full set of rules before ordering materials or starting work. A proposal must meet all relevant limits and conditions, not just one measurement.
1. Confirm the property type and its planning history
The standard householder permitted development rights do not apply in the same way to every property. Flats and maisonettes are treated differently, and some houses have conditions or planning restrictions that remove or limit permitted development rights. Earlier extensions can also affect what remains available.
2. Measure the proposal accurately
Record the projection, height, width and position of the proposed extension. The relevant measurements depend on the type of extension and the particular permitted development class. Check the relationship with the original house and the boundaries, rather than measuring only from a later addition.
3. Check the position of the extension
Whether an extension is to the rear, side or front can make a significant difference. The principal elevation, the highway and the position of the property within a conservation area or other designated land may affect the rules.
4. Look at materials and external appearance
Some permitted development rules include requirements about materials, roof form, upper-floor side windows and other design details. A proposal that is within the headline size limit can still fail another condition.
5. Check for Article 4 directions and planning conditions
Article 4 directions and conditions on previous planning permissions can restrict permitted development rights. The planning history should be checked rather than assuming the national rights are available.
6. Consider applying for a Lawful Development Certificate
A proposed Lawful Development Certificate is a formal application to the local planning authority for a decision on whether the described development would be lawful. It is often useful to have this confirmation before work begins, particularly where you may later need to demonstrate the planning status of the extension.
Planning drawings and measured information
Clear existing and proposed drawings help explain the dimensions, layout and appearance of a proposal. Depending on the application, drawings may include floor plans, elevations, sections and a location plan.
Robert Blake Designs prepares residential planning drawings and Lawful Development Certificate applications for homeowners in Harlow, Essex and nearby Hertfordshire.
Please note: Permitted development is governed by detailed legislation and depends on the circumstances of each property. This guide is not a substitute for checking the current rules or obtaining advice from the local planning authority.
Read about Lawful Development Certificates · Contact Robert Blake Designs
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