Extension into the side return passage of a terraced or semi-detached property. Often combined with rear extension to create open-plan kitchen-dining space.
Typical cost
£24,000 — £40,800
Typical duration
6-8 weeks
Certificate
Building Regulations approval required
Scope type
flexible
Typical tasks
Excavate side return and form strip foundation
Build walls in matching brick
Construct roof connecting to existing
Install glazed roof or lantern section
Make good connections to existing structure internally
Extras & additional works
Based on a standard 15m² side return extension, costs may increase if additional structural work or high-spec materials are required.
Common questions Stainesai
The price can be affected by the size of the extension, choice of materials, complexity of the design, and any additional structural work required.
Yes, building regulations approval is required for a side return extension to ensure structural safety and compliance with UK standards.
A typical side return extension takes about 6-8 weeks to complete, depending on the complexity and any unforeseen issues.
The project typically includes excavation, forming strip foundations, building walls, constructing the roof, and making internal connections to the existing structure.
Planning permission is often not required for a side return extension that falls within permitted development rights. In England, this is typically up to 4 metres for a detached house and up to 3 metres for a semi-detached or terraced house. Larger extensions may still be possible under the prior approval process. Building Regulations approval is generally required for extension work. Always confirm requirements with your local authority before work begins.
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