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Extensions
Your Guide to Home Extensions: Planning and Building Regulations
Do You Need Planning Permission for Your Extension?
General Planning Rules for All Extensions
Specific Planning Rules for Side Extensions
Specific Planning Rules for Single-Storey Rear Extensions
Specific Planning Rules for Multi-Storey Extensions
Understanding the 'Prior Approval' Process
Do You Need Building Regulations Approval for Your Extension?
Building Regulations: Foundations
Building Regulations: Walls Below Ground Level (Substructure)
Specific Planning Rules for Side Extensions
If you're considering a side extension that will project further than the existing side wall of your home's original structure, you'll need to be aware of some specific rules:
You cannot build it to a height greater than four metres.
It must only consist of a single storey.
The maximum width permitted is half the width of your original dwelling.
It's vital to understand that if your property is located within what's known as 'Article 2(3) designated land' – these are special conservation areas like National Parks or Areas of Outstanding Natural Beauty – then every single side extension will require you to secure 'householder planning permission'. This means you'll have to submit a formal application to your local council before proceeding.
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Disclaimer
This guidance is for general information only and is not legal advice. Planning requirements vary by council and property. You should check your local planning authority's specific requirements before submitting an application or starting work. This guidance applies to England and Wales. When in doubt, contact your local planning authority or seek professional planning advice.
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