Side Return House Extensions
Stuck with wasted alleyway space beside your home? A side return extension turns that narrow, unused strip into a bright, open-plan kitchen or living area, transforming your layout without losing garden space.
Book your free side return extension consultation with KNR Group today.
Maximises wasted space
Makes use of the narrow alley area alongside your home.
Increases light and flow
Skylights and bi-fold doors flood your home with daylight.
Adds value and appeal
A stylish, practical upgrade that can increase property value by 15–20%.
What is a Side Return Extension
A side return extension is a clever way to expand your home by extending into the narrow space running alongside it, usually between your house and boundary wall. It’s particularly popular for Victorian and Edwardian terraced homes in London and semi-detached houses in Essex, where space is limited but potential is huge.
By opening up this area, you can create a larger kitchen, dining space, utility room, or home office, seamlessly connected to the rest of your ground floor.
Why Choose KNR Group for Side Return Extensions
With decades of experience across London, Essex and Hertfordshire, KNR Group design and build side return extensions that are practical, elegant, and built to last.
We take care of every stage, from planning and design to construction and final finishes, so you can enjoy the transformation without the stress.
- Local experts in planning permissions for period homes
- In-house design, structural, and build teams
- Transparent pricing with full project management
- Minimal disruption and guaranteed quality workmanship
Contact KNR Group today to book your free site visit and tailored quotation.
Types of House Extensions
Our Process
Consultation and Site Survey
We assess your property, discuss your goals, and outline potential layouts.
Architectural Design
Tailored designs that meet your space, budget, and style preferences.
Planning and Building Control
KNR Group manages all permissions, drawings and compliance paperwork.
Construction
Managed by qualified professionals, ensuring precision, safety, and efficiency.
Completion
Every project is signed off with final inspections, certification, and warranties, ready for occupancy or sale.
Project Timelines
A side return extension typically takes 8–14 weeks to complete, depending on complexity, materials, and weather.
Our project managers ensure smooth scheduling, minimal disruption, and regular updates throughout your build.
Cost of a Side Return Extension
The cost depends on your home type, materials, and finishes. Typical guide prices:
| Extension Type | Average Cost |
| Standard side return | £40,000 – £65,000 |
| Glazed modern side return | £55,000 – £80,000 |
| Wraparound side & rear | £70,000 – £110,000 |
Costs include all labour, materials, structural work, and project management. KNR Group provides detailed, fixed-price quotations before any work begins — so there are no surprises.
Planning Permission for Side Return Extensions
Many side return extensions in Essex and London fall under permitted development rights, meaning planning permission isn’t always required if the build meets specific guidelines:
- The height does not exceed 4 metres.
- The extension doesn’t extend beyond the rear wall by more than 3 metres (for semi-detached) or 4 metres (for detached).
- It doesn’t cover more than half the garden area.
However, if your property is in a conservation area or a listed building, full planning permission is required. KNR Group’s planning specialists handle all the paperwork and liaise directly with local councils.
FAQs – Side Return Extensions
How much does a side return extension cost in Essex?
A side return extension in Essex typically costs between £40,000 and £70,000, depending on materials, design, and property size. KNR Group provides detailed, transparent quotes for every project.
Do I need planning permission for a side return extension in London?
Most side return extensions in London can be built under permitted development rights, but planning permission may be needed for listed buildings or larger projects. KNR Group handles the full process for you.
How long does a side return extension take to build?
Most side return extensions take 8–14 weeks to complete, depending on complexity and weather. KNR Group provides clear timelines and manages all stages from start to finish.
Can I have a glass roof on a side return extension?
Yes — glass roofs or skylights are popular choices that bring in natural light and make your extension feel bright and spacious.
Does a side return extension add value to my home?
Absolutely. A well-designed side return extension can increase your home’s value by 15–20%, especially in high-demand areas like London and Essex.
Why KNR Group is the Right Choice for Side Return Extensions
- Design-led construction – Every extension is carefully designed for beauty, flow, and practicality.
- End-to-end service – From drawings to final decoration, everything handled in-house.
- Local knowledge – Experts in planning and building regulations across London and Essex.
Schedule your free design consultation and discover how KNR Group can make your dream home a reality.
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House Extensions & Renovation Projects
Client testimonials
Video Testimonial
This rear extension showcases KNR Group’s ability to deliver a smooth, well-managed build from start to finish. With clear communication and quality craftsmanship throughout, the result is a bright, open space that’s transformed how the homeowner lives day to day.