Contemporary open plan Kitchen design and build by Proficiency

Trusted Construction Company London

For a decade, Proficiency, a building company in London, has led all aspects of high-end construction. Whether you're looking to expand or refine your home with a loft conversion, new build rear or side extension, basement conversion, or a top-to-bottom refurbishment, our ethos is high quality-first craftsmanship for the very best in residential design and build in London.

home Building

Each day we strive to be London's leading luxury design and build contractors, so each day our clients get no less than our very best.

Leaders in Design & Build

Building Services


kitchen extension with skylight built by a building company Proficiency
Hillfield Road, London

Wrap Around Extension
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navy blue kitchen
Islington, London

Rear Extension
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Cambridge Road, London

Extension & Loft Conversion
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Hillfield Road, London

Wrap Around Extension
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For a decade, Proficiency's construction company has been working with homeowners across South, North London and the Home Counties to facilitate construction works like kitchen extensions, loft conversions, interior design renovation or expansion of their properties. Our build-only service involves collaborating with your architects, engineers and interior designers to achieve the dream home you want. Our full end-to-end service means that we're with you from start to glorious finish. It starts with an architect service to help you to deal with planning permissions, party wall agreements and structural drawings. Then you get the expertise of our interior designers, builders, engineers and project management team to guide you through the entire process.

So if you are after the best building company to deliver top-quality work, get in touch with Proficiency to get started with free consultations for all your build and design needs.

As building contractors, our aim is to translate your instructions into action and to transform your property into the finished home of your dreams.


When it comes to the quality and care that we put into every project, we think of ourselves as one of the leading building companies in London. This means that, as the right builder, we have the team, the expertise and the commitment to a high quality that sets us apart.

  • Fully insured with Public and Employers Liability, Professional Indemnity, Contractors All Risk and high-risk basement works.
  • We offer a 15-year guarantee on all of our structural building work.
  • Proficiency only uses the highest quality building materials ensuring everything is built to standard and will last.
  • We have a large team of office-based staff, including a dedicated project manager providing you with peace of mind and security throughout your project.