If you are thinking about extending your home, one of the first questions is whether you need planning permission. Some house extensions can be built under permitted development rights, while others need a householder planning application. The answer depends on the property, the size and position of the proposed extension, and any restrictions affecting the site.
What is permitted development?
Permitted development rights are national planning rules that allow certain types of building work to proceed without a full planning application, provided every relevant condition and limitation is met. They can cover some single-storey rear extensions, side extensions, roof alterations and outbuildings.
There is no single permitted development allowance that applies to every house. The rules can be affected by the original house, previous extensions, the location of the proposal and whether permitted development rights have been removed.
When might a planning application be needed?
- The proposal exceeds the relevant permitted development limits.
- The work is on a property where permitted development rights have been restricted or removed.
- The house is a flat or maisonette, or the proposal is not covered by the householder permitted development rules.
- The property is in a designated area or has other planning constraints that affect the available rights.
- The proposal changes the use or appearance of the property in a way that requires permission.
What should be checked before you start?
Check the planning history, any conditions attached to earlier permissions, the property boundaries and the exact dimensions of the proposed work. A site visit and measured drawings can help establish what exists and what is proposed. Do not rely on a neighbour’s extension as proof that the same work is permitted at your property.
What drawings might be required?
A planning application commonly needs a location plan, existing and proposed floor plans, elevations and sometimes sections. The local planning authority may also request supporting information depending on the site and proposal.
Would a Lawful Development Certificate help?
If you believe the proposal is permitted development, you can apply for a proposed Lawful Development Certificate. The local planning authority assesses the submitted details against the relevant legislation and can issue a formal certificate confirming whether the proposal is lawful. This is different from planning permission.
How Robert Blake Designs can help
Robert Blake Designs prepares measured surveys, residential planning drawings and application documents for homeowners in Harlow, Essex and nearby Hertfordshire. I can help establish the drawing requirements and prepare plans for a planning application or Lawful Development Certificate.
Important: Planning rules are site-specific and can change. This article is general guidance, not a determination that a particular proposal is permitted. Check with the relevant local planning authority before starting work.
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