Rear Extensions Across London

For over 22 years, Foundation and Finishing has been designing and building Rear Extensions across Greater London. We extend your home out into the garden to create generous, light-filled family spaces with seamless indoor–outdoor living.

London's Most Trusted Construction Partner

20+ Years Delivering Excellence

100+ London Projects Completed

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Based on 56 Reviews
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Based on 82 Reviews
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Based on 108 Reviews

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Our Services

Professional Building Services in Rear Extensions

For over 22 years, Foundation and Finishing has been delivering exceptional Rear 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.

Rear extensions are one of the most effective ways to enlarge your living space, creating open-plan kitchen, dining, and family areas that connect directly with your garden. Whether you live in a terraced, semi-detached, or detached home, a rear extension can dramatically improve how you use your ground floor. We specialise in both modest single-room extensions and larger open-plan spaces featuring wide openings, roof lanterns, and modern glazing.

Many single-storey rear extensions fall under permitted development, though we always confirm your specific position and handle any planning applications if required. From the first ideas and budget advice through to structural design, foundations, walls, roofing, and high-quality finishes, we manage the whole process. We coordinate doors, windows, insulation, underfloor heating, lighting, and flooring so that the finished room feels comfortable, practical, and beautifully connected to the garden throughout the year.

Generous Open-Plan Space

Creates a large, open-plan living/kitchen/dining area that becomes the main hub of the home.

Better Garden Connection

Uses wide doors and glazing to link your interior and garden for easier outdoor access and entertaining.

Modern Layout Options

Allows for contemporary, flowing layouts that are not possible within the original footprint of the house.

Brighter Rear Rooms

Improves natural light and ventilation across the rear of the house through rooflights and large openings.

Strong Property Appeal

Adds significant value and buyer appeal by providing the kind of space many purchasers now look for.

Suits Any Style

Can be tailored to complement both traditional period homes and modern properties.

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

Under permitted development, many homes can extend 3–4 metres at the rear, sometimes more under larger home extensions schemes. We confirm the exact limits for your home.
Not always. Many single-storey rear extensions fall within permitted development. We check your property type, previous alterations, and council rules before proceeding.
Properly designed rear extensions use rooflights, wide openings, and thoughtful layouts to increase light, not reduce it. We focus on glazing, orientation, and finishes to keep spaces bright.
Most clients stay in their homes while we work. There will be disruption, but we plan site access, protection, and temporary services to keep your home usable.
Yes. Many clients choose a clean, contemporary extension at the back while keeping period features at the front. We ensure the design complements your existing home.

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