Do I Need Planning Permission for a House Extension?
One of the first questions homeowners ask when thinking about extending their home is: “Do I need planning permission?”
The answer depends on the type of extension, your location, and how you want to transform your property.
As specialist house extension architects in London, here’s what you need to know:
Some smaller extensions can be built under Permitted Development Rights. This can include:
Single-storey rear extensions within certain size limits
Loft conversions with set height restrictions
Some side extensions, if they are small in scale
However, strict rules apply — and they vary depending on whether your home is detached, semi-detached, or terraced.
When Planning Permission Is Required
You’ll need formal planning approval if your extension:
Exceeds the size limits for permitted development
Changes the front of your property
Is in a conservation area or listed building
Significantly alters the external appearance of your home
This is where working with an architect becomes invaluable.
Why an Architect Helps Secure Approval
An architect-led planning application greatly increases your chances of success. At Homes by Office Sian, we prepare clear drawings, design statements, and planning documents that show how your extension enhances both your home and the surrounding area.
Beyond Permission: Building Regulations
Even if you don’t need planning permission, all extensions must comply with building regulations. This ensures your project meets standards for structure, insulation, fire safety, and energy efficiency.
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Ready to Explore Your Extension?
At Homes by Office Sian, we specialise in guiding homeowners from the first sketch through to planning approval and construction. Whether your project needs full permission or can proceed under permitted development, we’ll help you find the best route forward.
Book a consultation today to discuss your plans with an architect.
