Kitchen Layout Guide for London Extensions: Galley, L-Shape and Open-Plan

The classic kitchen design principle is the work triangle — the relationship between the three primary working positions: the hob (cooking), the sink (cleaning), and the refrigerator (storage). A kitchen that minimises the total distance between these three points, and keeps the paths between them free of traffic, is ergonomically efficient. The ideal work triangle total distance: 4-8m (too small and positions are cramped; too large and movement becomes tiring). In contemporary open-plan kitchen design, the work triangle has evolved into a kitchen zone concept: the preparation zone (island or peninsula worktop nearest the refrigerator); the cooking zone (hob, oven, extraction hood, nearby pot storage); and the cleaning zone (sink, dishwasher, waste and recycling). These zones should flow logically without the cooking zone interrupting the prep-to-sink movement. In an open-plan kitchen extension, the kitchen zone must also work in relation to the adjacent dining and living zones — the sight lines, the acoustic separation, and the visual flow all affect how well the kitchen integrates into the open-plan space.

A galley kitchen — two parallel runs of cabinets and worktop with a central aisle — is the traditional layout for the narrow kitchen in the rear outrigger of a Victorian terrace. It uses the available width (typically 2.2-2.8m between walls) efficiently, placing the cooking zone on one run and the cleaning zone on the other. Advantages: very efficient use of a narrow space; all the work surfaces are immediately adjacent; easy to install extraction (hob centred on one wall, hood above). Limitations: the galley is single-traffic — two people cooking side by side is difficult; no natural island for informal dining or prep overflow; the kitchen is visually separated from dining and living because the long parallel runs create an enclosed feel. In a London extension, the galley is sometimes the chosen layout for the working kitchen section (in the original outrigger, retained as the cooking zone), while the extension beyond creates the open dining and family space. The galley works best in spaces under 2.4m wide.

An L-shape kitchen — cabinets along two adjacent walls, meeting at a corner — is the most commonly used and versatile layout for London kitchen extensions. The L-shape uses two walls of the new extension space, freeing the rest for dining and living. Advantages: the corner creates a compact work triangle between hob, sink, and refrigerator; the open end of the L faces the dining area, so the cook faces the room rather than a wall; the corner can be used for a corner unit or a seamless lazy Susan, making typically dead corner space usable; the layout easily accommodates an island in the open space. Limitations: corner units (the junction between the two runs) require careful planning — standard cabinets do not meet at a 90-degree corner without a compromise (lost space, a carousel unit, or a corner drawer). Island: an island in front of the L-shape is the ideal complement in a larger London kitchen extension. The island provides additional prep space, informal seating at stools, and a transition between the kitchen zone and the dining/living area.

A kitchen island — a freestanding or fixed cabinet unit in the centre of the kitchen space — is the aspirational centrepiece of most London open-plan kitchen extensions. Islands serve multiple functions: additional prep surface (extending the worktop); informal dining (stools at the island facing the dining area or garden); zone definition (the island marks the boundary between kitchen and dining space); and additional storage or appliance housing (a second sink, a wine cooler, a warming drawer). For an island to work in a London extension, the minimum clearance between the island and the surrounding cabinets or walls is 900mm (ideally 1,050-1,200mm on the main circulation side). An island in a space under 4m wide is typically too cramped and compromises both work efficiency and circulation. A peninsula — a counter extending from the L-shape run into the room, connected on one end — gives island-like functionality in a smaller space and is useful in London extensions where the footprint is not large enough for a true island. It provides informal seating on the room-facing side and additional worktop on the kitchen-facing side.

In an open-plan London kitchen extension, the kitchen layout is not designed in isolation — it must work as part of a larger floor plan that includes the dining area and the living or family zone. Key open-plan kitchen design decisions: Kitchen orientation: in most London Victorian terrace extensions, the kitchen backs onto the original house (the working kitchen runs against the new extension wall connecting to the house), and the new extension space beyond is the dining and living area. This puts the cook with their back to the dining area — the island or peninsula corrects this by providing a surface the cook can face when working, looking into the room. Extraction: an overhead extractor hood requires positioning over the hob — if the hob is on an island, a ceiling-mounted extractor (a downdraft extractor or a ceiling-suspended hood) is required. These are more expensive and less efficient than wall-mounted hoods. Where possible, position the hob against a wall with a wall-mounted hood. Acoustic separation: an open-plan kitchen is acoustically connected to the dining and living areas. The dishwasher, the extractor hood at high speed, and the noise of food preparation are audible throughout the room. Specification decisions (quiet dishwasher, variable-speed low-noise extraction) affect the quality of the open-plan space significantly. Visual connection to the garden: where bi-fold or sliding doors open the rear of the extension to the garden, the kitchen should be positioned to maintain the view of the garden from the cooking position. The best London kitchen extensions allow the cook to see the garden, the dining area, and anyone in the adjacent living zone simultaneously.