Garage Conversions Across London

For over 22 years, Foundation and Finishing has been delivering Basement Conversions across Greater London. We turn dark, underused basements into bright, habitable rooms designed for modern 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 Garage Conversions

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

Basement conversions unlock valuable space below your home, particularly in urban areas where extending outwards is difficult. Whether you want a family room, cinema, guest suite, gym, or utility space, we design basements that feel comfortable, safe, and properly integrated. We assess structure, headroom, access, and waterproofing so the new rooms meet modern standards.

Careful engineering and detailing are essential for successful basements. We work with structural engineers and specialist waterproofing designers to create robust solutions that manage water, damp, and loads. Lighting design, ventilation, and escape routes are all planned from the outset so the finished basement feels airy rather than enclosed. From initial concept to final finishes, we manage every stage.

Significant Extra Space

Creates substantial additional floor area without changing the building footprint above ground.

Urban-Friendly Option

Ideal for tight urban plots where side or rear extensions are restricted.

Versatile Room Types

Suitable for cinemas, gyms, playrooms, guest suites, utility spaces, or home offices.

Improved Property Value

Often delivers a strong uplift in property value in London markets.

Discrete Changes Externally

Adds internal space while keeping external changes minimal or carefully controlled.

Future Flexibility

Provides space that can adapt as your family’s needs change over time.

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 do, especially where excavation or external changes are involved. We assess your property and handle any planning applications needed.

We design and install robust waterproofing systems, usually using tanking membranes and drainage channels, specified by qualified specialists.

Basement works are significant, but careful planning, access routes, and protection measures help manage dust, noise, and disruption.

Yes. Light wells, external staircases, and glazed doors can all be incorporated subject to planning and site constraints.

It depends on your area and goals. In many London postcodes, the value added by high-quality basement space can justify the investment.

Book Your FREE Home-Visit and Consultation