A detailed guide to side return extensions in Surrey and SW London, including layout ideas, typical costs and planning considerations for Victorian and Edwardian homes.
Why Side Return Extensions Are So Popular
Side return extensions are one of the most effective ways to transform narrow ground floors in period homes. By extending into the unused alley space, homeowners can dramatically improve light, layout and usability without sacrificing garden depth.
- Ideal for Victorian and Edwardian properties
- Creates wider, open-plan kitchens
- Often achievable under permitted development
| Typical Side Return Extension Costs (2026) |
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Average cost: £2,500 – £3,500 per m² Structural steel and glazing increase costs Wraparound extensions cost more but add space |
Explore design-led solutions on our side return extension service page or view completed examples in our projects portfolio.
Side Return Extension FAQs
Answers to common side return extension questions.
Do side return extensions need planning permission?
Many are permitted development, but size, materials and location still matter.
Are side return extensions expensive?
They are cost-effective for the space gained, but structural work can raise costs.
Can I add rooflights?
Yes. Rooflights are common and improve natural light significantly.
Will I lose garden space?
Minimal garden loss compared to rear-only extensions.
Do neighbours need to be informed?
Party wall notices are often required due to shared boundaries.
Is a wraparound extension better?
Wraparounds add more space but increase cost and planning complexity.
