Understanding Storey Extensions and Planning Permission
Storey extensions are a great way to add space and value to a property. Whether you're expanding your home for a growing family or increasing its market appeal, understanding planning permission is essential. While some extensions fall under permitted development, others require approval from the local planning authority. Knowing the rules ensures a smooth process and prevents legal complications.
Do You Need Planning Permission?
Not all storey extensions require planning permission. Under permitted development rights, homeowners can extend their property without approval, provided they meet specific criteria. Key conditions include:
The extension must not exceed the highest part of the existing roof.
It should not extend beyond the rear wall by more than three metres for semi-detached or terraced houses and four metres for detached houses.
The total height must not exceed three metres if within two metres of a boundary.
If the proposed extension does not comply with these limits, a planning application is necessary. Consulting with the local planning authority helps clarify whether permission is required.
Factors Influencing Planning Approval
Even when an extension needs planning permission, certain factors determine whether it gets approved:
1. Impact on Neighbours
The local authority considers how the extension affects neighbouring properties. Overshadowing, privacy concerns, and loss of light can lead to objections. Engaging with neighbours beforehand can help mitigate potential disputes.
2. Design and Aesthetic Appeal
Extensions should complement the existing structure and surrounding properties. Materials, roof style, and proportions must align with local building guidelines.
3. Conservation Areas and Listed Buildings
If your property is in a conservation area or is a listed building, stricter rules apply. Planning permission is almost always required in such cases, with design restrictions to maintain historical integrity.
4. Environmental and Structural Considerations
The extension should not negatively impact drainage, structural stability, or green spaces. Sustainable building practices, such as energy-efficient materials and rainwater drainage solutions, can increase approval chances.
How to Apply for Planning Permission
Applying for planning permission involves several steps:
Prepare a Detailed Plan
Architectural drawings and structural plans are essential. They should include dimensions, materials, and positioning.Consult the Local Authority
Speaking with planning officers early can provide guidance and prevent unnecessary revisions.Submit the Application
Online applications through the Planning Portal are the most convenient option. The process typically takes up to eight weeks for a decision.Respond to Feedback
If adjustments are required, modifying plans according to recommendations can improve approval chances.
Common Reasons for Planning Rejection
Understanding why applications get rejected helps in creating a strong proposal. Common reasons include:
Excessive Scale – If the extension dominates the existing property or disrupts the neighbourhood’s character.
Neighbour Objections – Privacy concerns, overshadowing, or loss of light.
Design Mismatch – If the extension’s appearance does not harmonise with the surroundings.
Impact on Highways – Extensions affecting parking spaces or road access may face refusal.
To avoid rejection, seeking professional guidance from architects or planning consultants is advisable.
Alternative Options if Planning is Denied
A rejected application is not the end of the road. Homeowners have options:
Revise and Resubmit
Making minor modifications based on the council’s feedback can lead to a successful outcome.Appeal the Decision
If the refusal is deemed unreasonable, an appeal can be lodged with the Planning Inspectorate.Consider a Smaller Extension
Reducing the scale or adjusting the design might bring the project within permitted development rights.
Conclusion
Storey extensions offer valuable space but often require planning permission. Understanding local regulations, engaging with neighbours, and preparing detailed plans increase approval chances. By following the correct procedures and consulting professionals when needed, homeowners can achieve a seamless extension process.
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