Kitchen Layouts: Galley, L, U & Island

The layout you choose for a kitchen determines how it functions every day for the next 20 years. Room dimensions, the number of people who cook simultaneously, and whether the kitchen opens into a living space all point towards different configurations. This guide covers the six layouts most used in UK homes, the work triangle principle, island planning rules, Building Regulations requirements, and realistic 2026 costs.

Getting the layout right before ordering a single unit saves far more than shopping around for cheaper cabinets. A poorly configured kitchen is expensive to reconfigure once fitted; a well-configured one adds measurable value regardless of the spec.

The Work Triangle

The kitchen work triangle connects the three primary activity zones, hob, sink, and fridge, into a conceptual triangle. The rule of thumb, which grew out of mid-20th-century kitchen research, suggests that:

• Each leg of the triangle should be between 1.2 m and 2.7 m
• The total perimeter of the triangle should be between 4 m and 8 m
• No major traffic route (a doorway or through-route) should bisect any leg

For kitchens with a single cook, the work triangle remains a sound planning tool. In households with two regular cooks or in larger open-plan arrangements, the triangle is less critical, the focus shifts to ensuring each zone has adequate adjacent worktop and that the overall flow between cooking, preparation and clean-up is logical. Islands often break the triangle deliberately, creating parallel prep zones rather than a single triangular circuit.

Layout Comparison Table

Single-Wall Layout

A single-wall kitchen places all units, tall, base and wall, along one wall. It is the simplest configuration and is common in studio flats, open-plan spaces where the kitchen occupies one zone, and converted outbuildings.

Practical limits: Worktop run is constrained to the wall length. Without a return or island, you will typically have 2–3 m of worktop. This is functional for one-person households but becomes frustrating for anything more ambitious. If the room is wider than 3 m, a single-wall layout wastes the opposing wall entirely.

When it works well: In open-plan layouts where the kitchen is one defined zone in a larger room, a single-wall configuration keeps the space visually clean and avoids blocking sightlines into a living or dining area.

Galley / Parallel Layout

A galley kitchen runs two parallel runs of units facing each other along opposite walls, with a corridor between them. It is the most efficient layout in terms of workflow, everything is within a short step, and is particularly common in London flats and narrow Victorian terraced houses.

Critical dimensions:

• Minimum 1.2 m clear between facing units (absolute minimum for one cook)
• 1.4 m ideal, allowing two people to work without obstructing each other
• 1.8 m or more starts to feel like a large commercial kitchen; the extra distance reduces efficiency

Room width guidance: The galley works in rooms about 2.4–3 m wide once units (typically 600 mm deep) are accounted for on each side. A room 2.4 m wide yields 1.2 m clear, workable for one person. A room 2.8 m wide gives 1.6 m clear, which is the practical sweet spot.

Open-plan use: A galley can work in open-plan spaces if one run backs onto a structural wall and the opposite run faces into the living area, but the parallel run facing the room can make the kitchen feel exposed. A peninsula on the open-plan side improves this.

L-Shape Layout

The L-shape is one of the most popular kitchen layout choices in the UK. Units run along two adjacent walls meeting at a corner, creating a natural work zone in the corner area and flexible open space on the remaining two sides.

Room size: Works well in rooms from 10–20 m². Below 10 m², the L can feel cramped; above 20 m², the distance between the end of each run can stretch the work triangle beyond the recommended 2.7 m per leg.

Corner unit considerations: The corner junction is the most commonly wasted space in an L-shape kitchen. Standard corner base units provide poor access. Solutions that justify the additional cost:

• Carousel (lazy Susan): rotating shelves in an L-shaped corner unit, good accessibility
• Blind corner pull-out (LeMans or ‘magic corner’ type): shelves that swing or slide out of the blind corner so its contents come to you
• Corner drawers: drawers that run diagonally into the corner, where the unit range offers them

Open-plan suitability: The L-shape is excellent for open-plan kitchen-diners. The two runs create a natural cooking zone, and the open corner can accommodate a dining table or seating without feeling disconnected from the kitchen.

U-Shape Layout

A U-shape kitchen wraps units around three walls, maximising storage and continuous worktop. It is the layout of choice for households with serious cooking requirements and rooms large enough to accommodate it.

Critical dimensions:

• Minimum about 1.2 m clear between the two facing runs, the same as a galley, so the room needs to be at least about 2.4 m wide with 600 mm units on each side
• Below 1.2 m clear, the space feels cramped and two cooks cannot pass each other comfortably
• Around 1.5 m clear is comfortable; much beyond about 2.5 m the runs start to feel far apart and the work triangle stretches
• Room size: typically 15–25 m²

Workflow advantage: With three runs of units, hob, sink and fridge can each occupy a separate run, creating an ideal work triangle. Each zone has adjacent worktop. Total worktop length in a U-shape kitchen for a 4 m × 4 m room might reach 7–9 linear metres.

Limitations: The U-shape can feel enclosed, particularly in rooms without a window on multiple walls. A skylight or roof lantern makes a significant difference. The layout also leaves only one entry point unless one end of the U is left open (which transitions into an island or peninsula configuration).

Island Layout

An island is a freestanding or semi-attached unit positioned in the centre of the kitchen, separate from the perimeter runs. It has become the defining feature of large open-plan kitchen-diners and adds considerable versatility, and cost.

Minimum space requirements:

• 900 mm clearance on all sides of the island (Building Regulations do not specify this, but it is the accepted practical minimum; 1,000–1,200 mm is preferable)
• Total room size: typically at least 3.5 m × 3 m once island dimensions are factored in
• A standard island (1,000 mm × 900 mm footprint) in a 3.5 m × 3 m room leaves clearance on each side, but there is little margin for larger islands

Services: An island with a sink requires a water supply and waste connection, pipes run under the floor or through a raised deck. A hob island requires gas supply (if gas) or a high-amperage electrical circuit, plus extraction, either a ceiling-mounted extractor or a downdraft extractor integrated into the island. Downdraft extractors are generally less effective than overhead extraction but eliminate a ceiling duct.

Seating overhang: Island seating requires a worktop overhang of 250–300 mm to allow stools to sit under the surface. Standard worktop height is 900 mm; stools for this height (usually sold as counter-height or kitchen stools) have a seat height of roughly 60–65 cm, leaving about 25–30 cm between seat and worktop. If the island has a raised breakfast bar (1,050–1,100 mm), taller bar stools at about 75–80 cm seat height are needed.

Cost: An island adds £2,000–£8,000 over the cost of a perimeter-only kitchen in unit and worktop cost alone, before any extended services. A single island unit (no plumbing) supplied only: approximately £1,500–£8,000 depending on construction and worktop material.

Peninsula: The Practical Alternative

A peninsula is a run of units attached at one end to a wall or existing run, projecting into the room. It performs many of the same functions as an island, additional worktop, seating, zone separation, with less clearance required and no need to route services to the centre of the room.

Advantages over a full island:

• Needs clearance on three sides only (the fourth end is attached)
• No plumbing or gas extension required unless adding a sink
• Less expensive to construct and install
• Works in rooms too small for a full island

A peninsula is particularly effective in open-plan layouts where it acts as a soft boundary between kitchen and living or dining areas without fully closing off the space.

Building Regulations and Technical Requirements

Extraction ventilation (Part F): Approved Document F sets the minimum intermittent extract rate for a kitchen at 30 litres per second where a cooker hood extracts to the outside, or 60 litres per second where there is no cooker hood or the hood does not extract to the outside.¹ A recirculating filter hood therefore does not count as extract ventilation on its own: with one, the kitchen needs a separate extract fan ducted outside. Refitting a kitchen does not always mean adding extraction, though: if the original room had no ventilation system, Approved Document F says it is not necessary to provide one in the refurbished room, provided the work does not leave ventilation worse than before.¹

Long or winding duct runs reduce a hood’s performance, so keep the run short and within the manufacturer’s stated maximum. Ducts must terminate through an external wall or roof, not into a roof void or cavity.

Electrical: An electric hob or cooker normally runs on its own dedicated circuit from the consumer unit. Under Approved Document P, installing a built-in cooker is not notifiable building work unless a new cooker circuit is needed, and a new circuit must be notified to building control or self-certified by a registered electrician.² Minimum practical socket provision above worktop is six double sockets; more for kitchen-diners with charging zones. USB-A/C sockets are worth specifying near seating areas. Socket height is typically 150 mm above worktop level.

Worktop height: Standard is 900 mm. The old British Standard for kitchen dimensions, BS 6222, was withdrawn in 1996.³ Coordinating sizes for kitchen furniture and appliances are now covered by the European standard BS EN 1116. If the household includes people significantly taller or shorter than average, worktop height can be adjusted; bespoke units or leg adjustment is required.

Gas supply for islands: Extending a gas supply to an island needs a Gas Safe registered engineer. The Gas Safety (Installation and Use) Regulations 1998 allow gas work done in the course of business only by members of a class of persons approved by HSE, which is the Gas Safe Register.⁴ The pipework is usually run in the floor void or screed, sleeved and protected where it passes through concrete.

2026 Cost Summary

• Flat-pack galley kitchen (budget, supplied and fitted): £3,000–£7,000
• L-shape mid-range fitted kitchen (rigid carcasses, laminate doors): £8,000–£18,000
• High-end U-shape with island (handleless, quartz worktop): £25,000–£60,000+
• Island unit only, no plumbing (supply only): £1,500–£8,000

These figures exclude appliances unless stated. Appliances (hob, oven, extractor, dishwasher, fridge) typically add £1,500–£8,000 depending on specification.

Practical Planning Tips

Lighting: Plan three lighting layers from the outset, task lighting under wall units (LED strip or individual downlights), ambient overhead (recessed downlights or a pendant over the island), and accent lighting inside glass-fronted units or above-cabinet feature lighting. Adding under-unit lighting after installation is far more disruptive than wiring for it during the fit.

Extraction positioning: Decide extraction placement before finalising the hob position. Ceiling-mounted extraction over an island requires a duct route from the ceiling void; plan this with your builder before the plasterboard is closed.

Socket planning: Count appliances before finalising socket positions, kettle, toaster, coffee machine, microwave, and charging cables all need outlets. Six doubles above worktop is a practical minimum for a family kitchen; eight is better. Sockets at the end of an island or peninsula reduce cable clutter on the main runs.

Storage specification: Budget for a pull-out bin drawer (integrated into base units, 300–400 mm wide), pull-out larder (a tall unit whose shelves slide out together), and soft-close mechanisms throughout. These additions typically add £800–£2,500 to a mid-range kitchen but significantly improve daily function.