Side Return Extensions Across London

For over 22 years, Foundation and Finishing has been delivering exceptional Side Return Extensions across Greater London. We transform unused side passageways into bright, practical living space, typically expanding your kitchen without taking away from your garden.

London's Most Trusted Construction Partner

20+ Years Delivering Excellence

100+ London Projects Completed

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Our Services

Professional Building Services in Side Return Extensions

For over 22 years, Foundation and Finishing has been delivering exceptional Side Return Extensions services across Greater London. Whether you're adding space with a side return, creating an open-plan kitchen-diner, or building a double-storey addition, we handle every detail from planning permission to final completion.

Side return extensions make clever use of the narrow strip of land that often runs along the side of Victorian and Edwardian terraced homes. By infilling this underused area, we create wider, lighter kitchen and dining spaces that completely change how you use the ground floor of your home. Our designs focus on maximising natural light using rooflights or glazed strips, whilst carefully matching existing brickwork and details so the extension feels like it has always been there.

Most side return projects fall under permitted development rights, which means formal planning permission is often not required. We guide you through the process from initial feasibility and measurements through to structural design, party wall agreements where needed, and building control approvals. Our experienced team manages all aspects of the build including foundations, walls, roofing, glazing, plumbing, electrics, heating, plastering, and finishes, keeping disruption to a minimum. Typical build times are around 6–8 weeks, depending on size and specification.

Extra Floor Space

Adds 12–15 square metres of valuable living space, giving you a much larger and more practical ground-floor layout.

Garden-Friendly Layout

Makes use of the narrow side passage so you usually keep your main garden area intact.

Planning-Friendly Option

Often falls under permitted development, meaning no full planning application is needed in many cases.

Better Everyday Living

Transforms cramped kitchens into open, sociable family spaces that suit modern lifestyles.

More Natural Light

Introduces roof glazing and larger openings that bring much more daylight into the heart of your home.

Improved Storage & Practicality

Allows for better storage, circulation, and furniture layouts, improving day-to-day usability.

Why Families Choose Us

20+ Years, Results
That Speak for
Themselves

Over 100 London families trusted us with their biggest investment. The kind of work that makes homeowners call us back for their next property.

You Decide Everything, We Handle Everything

Over 100 London families trusted us with their biggest investment. The kind of work that makes homeowners call us back for their next property.

Group 2661 Foundation and Finishing in Greater London

Work That Actually Gets Done On Time

Over 100 London families trusted us with their biggest investment. The kind of work that makes homeowners call us back for their next property.

Same Team From Quote to Completion

We work with the same qualified tradespeople on every job. Gas engineers, electricians, builders, finishers. They know our standards and they deliver. One point of contact for you, zero coordination headaches.

Honest Communication

We give you realistic timelines and pricing up front. If we discover something unexpected during the work, you know immediately. No hiding problems until it's too late.

Group 2661 Foundation and Finishing in Greater London

20+ Years, Results
That Speak for
Themselves

Over 100 London families trusted us with their biggest investment. The kind of work that makes homeowners call us back for their next property.

You Decide Everything, We Handle Everything

Over 100 London families trusted us with their biggest investment. The kind of work that makes homeowners call us back for their next property.

Same Team From Quote to Completion

We work with the same qualified tradespeople on every job. Gas engineers, electricians, builders, finishers. They know our standards and they deliver. One point of contact for you, zero coordination headaches.

Honest Communication

We give you realistic timelines and pricing up front. If we discover something unexpected during the work, you know immediately. No hiding problems until it's too late.

Work That Actually Gets Done On Time

Over 100 London families trusted us with their biggest investment. The kind of work that makes homeowners call us back for their next property.

icon Trusted Construction Services
icon Quality Craftsmanship & Reliability
icon Strong Foundations, Lasting Results
icon Professional & Committed Team
icon Trusted Construction Services
icon Quality Craftsmanship & Reliability
icon Strong Foundations, Lasting Results
icon Professional & Committed Team

Our Process

Simple. Straightforward. No Surprises.

Here’s exactly how we handle every project, from start to finish.

Get In Touch

Here's exactly how we handle every project, from start to finish.

We Listen & Advise

We measure everything, talk through your vision, and tell you what will actually work in your space.

Clear Quote

Fixed price. Fixed timeline. No surprises halfway through your project.

We Build It

Same team from day one to completion. Weekly progress photos. Direct line to Fares whenever you need answers.

Frequently Asked Questions

Many side return extensions fall under permitted development and do not need full planning permission. We assess your property at the start and confirm the best route.
Most side returns take around 6–8 weeks on site, depending on size, complexity, and weather conditions. We provide a clear schedule before we start.
There will be some noise and dust, but we plan the works to minimise disruption, protect existing areas, and keep your home as liveable as possible while we build.
Yes, we can work alongside your chosen kitchen supplier or recommend trusted partners, ensuring the layout, services, and finishes are coordinated from day one.
We pay close attention to matching brickwork, roof tiles, and details so the new space feels like an integrated part of your home, not an obvious add-on.

Book Your FREE Home-Visit and Consultation