Contemporary open plan Kitchen design and build by Proficiency
| 4.9 50+ Reviews
Considerate Construction Scheme Houzz Award budge

­­Kitchen extensions in London

A well-planned kitchen extension can transform how your family lives, adding space, light, and real value to your London home. The key is working with builders who get both the vision and the practicalities right.

At Proficiency Design & Build, we've spent over 14 years transforming London kitchens with award-winning craftsmanship, smart design solutions, and careful attention to detail that goes beyond what you'd expect.

narrow rear home navy blue extension

Rated 4.9/5 on

Fantastic builders who really care about the quality of finish.

Portrait of Oliver Meek

Oliver Meek ( Director At Rio Cinema )

What Type of Kitchen Extension Are You Planning?

single extension

Rear Extension

Single rear extensions provide excellent solutions for creating modern kitchens while keeping garden access and plenty of natural light flowing through.

double extension with flat roof
Double Storey Extension

Increase your property's square footage with two-storey extensions that create valuable space for both kitchen areas downstairs and bedrooms upstairs.

side extension

Perfect for period properties and terraced houses, side return kitchen extensions increase ground floor space by incorporating narrow side passages into your main living area and kitchen.

wrap around extension
Wrap Around Extension

Combining rear and side extensions, wrap-around designs add substantial space to your TW1 property, ideal for large dining areas and family living spaces.

Our Building Company

Since 2011, Proficiency Design & Build has aimed to redefine luxury construction standards across Central London and the surrounding areas. Our 4.9/5 Google rating reflects our commitment to high-quality finishes and client satisfaction.

  • Fully-insured:Comprehensive insurance coverage including Public Liability, Professional Indemnity, and Contractors All Risk for your peace of mind. We are also NICEIC and Gas Safe approved.
  • Expert interior designers: A professional team with a dedicated showroom in West Hampstead to help you with your extension designs.
  • Planning success: We have a 100% planning application success rate across London councils.

Our Latest Home Extension Project

Contemporary kitchen and living room
The Avenue, Queen's Park Side Return Kitchen Extension View Project
Modern house renovation
Conewood Street, Highbury Side Kitchen Extension View the Project
side return extension
Cambridge Road, London Extension & Loft Conversion View Project
open plan Kitchen renovation
Wesbere Road, West Hampstead Kitchen Renovation View Project

Luxe Kitchen Design Ideas

open plan living dining kitchen area

Create sophisticated kitchen-diner and dining areas with integrated seating, statement lighting, and natural flow between cooking and entertainment sections.

open concept kitchen living room

Open-plan kitchen and living spaces with bi-fold doors connect indoor and outdoor areas, creating extra space throughout your home.

luxury kitchen island with seating

Add a central island with built-in appliances, a breakfast bar, or clever storage tailored to your cooking and socialising needs. It’s both practical and eye-catching.

flat glass roof light

Increase natural light in your new kitchen with strategically placed, high-end skylights and glazed panels.

planning application

We take care of your Planning permission

Our structural engineers, architects, and builders navigate London's complex building regulations, party wall agreements, and planning applications on your behalf.

Project Management

Our experienced team handles your kitchen extension from start to finish. With a dedicated project manager assigned to your project, we keep all building work on schedule, within budget, and completed to a very high standard.

How Much Does a Kitchen Extension Cost?

There is no "one size fits all" price for kitchen extensions in London. The final kitchen cost depends on the amount of building work required, how many tradesmen are involved, and which final touches you go for.

  • Single-storey extensions: Between £2,200 and £3,500 per m²
  • High-end ground floor extensions: From £3,100 per m²
  • Wrap-around extension: £50,000 to £120,000+ (30m²)
  • Kitchen renovation: £45,000 to £70,000
  • New builds: Starting from £3,500 per m²
Building a room

Work With Kitchen Extension Specialists

Whether you're in South East London or North West London, choose Proficiency's kitchen extension experts in London for your next building project. Contact Olivia, our head interior designer, at our kitchen showroom in West Hampstead today.

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