Kitchen Extensions in London: Create Your Dream Open-Plan Kitchen

A kitchen extension is the most popular reason London homeowners choose to extend their property. Whether you dream of a large island kitchen, an open-plan kitchen-diner for family meals, or a kitchen-living space that opens onto the garden, a well-designed kitchen extension can transform the way you live. LCCL Construction has delivered hundreds of kitchen extensions across London and Hertfordshire, creating beautiful, functional spaces that add real value to homes.

Kitchen Extensions in London

Types of Kitchen Extension in London

There are several ways to extend your kitchen depending on your property type and layout. A rear extension is the most common approach, pushing the back wall out into the garden to create a larger kitchen or open-plan kitchen-diner. A side return extension fills in the narrow passage alongside terraced houses, adding width to a typically narrow kitchen. A wraparound extension combines both rear and side return for the maximum kitchen space. A double storey extension can create a large kitchen downstairs with a bedroom or bathroom above. Each approach has different costs, planning implications and design possibilities. LCCL Construction assesses your property and recommends the best option during a free consultation.

How Much Does a Kitchen Extension Cost in London?

The building work for a kitchen extension in London typically costs £40,000 to £80,000 for a single storey extension in 2026. The kitchen fitting and appliances are an additional cost on top, typically £10,000 to £30,000 for a mid-range to high-end kitchen. A side return infill for a wider kitchen costs £35,000 to £50,000 for the building work. A wraparound extension creating a large kitchen-diner costs £60,000 to £100,000. These prices include all design, structural work, building regulations and construction. LCCL Construction provides detailed fixed-price quotes that break down every element so you know exactly what you are paying for.

Design Ideas for Kitchen Extensions

The most popular kitchen extension design in London is an open-plan kitchen-diner-living area with bi-fold or sliding doors opening onto the garden. A large kitchen island provides both workspace and informal dining. Vaulted or raised ceilings with rooflights create a sense of space and flood the room with natural light. Underfloor heating keeps the floor warm and eliminates radiators, freeing up wall space for cabinetry. Utility rooms and pantry storage can be incorporated into the extension design to keep the main kitchen uncluttered. Many clients also include a separate snug or family room within the open-plan layout using subtle level changes or furniture placement.

Planning and Building Regulations for Kitchen Extensions

Most single storey kitchen extensions in London fall under permitted development rights and do not require planning permission, provided they meet the size limits of 6 metres on terraced and semi-detached houses or 8 metres on detached houses. Building regulations approval is always required and covers structural integrity, insulation, ventilation, electrics and drainage. If your extension includes plumbing for a kitchen sink, dishwasher and washing machine, the drainage connections must meet building regulations standards. LCCL Construction handles all planning applications and building regulations as part of our design and build service.

Build Your Dream Kitchen with LCCL Construction

LCCL Construction delivers kitchen extensions across London and Hertfordshire with a complete design and build service. We handle architectural design, planning, building regulations, structural calculations, party wall agreements, all construction, electrics, plumbing and finishing. We work with your chosen kitchen supplier or can recommend trusted kitchen companies we have partnered with on previous projects. With over 20 years of experience, 200 plus reviews rated 4.7 out of 5, and the LABC Awards Regional Winner 2024, you can trust LCCL Construction with your kitchen extension. Call 020 8037 7332 or book at lcclconstruction.co.uk/booking-calendar/free-consultation-call.