An open-plan kitchen diner is now the heart of most London homes, and often the result of a rear or side-return extension. The appeal is obvious: light, sociability and space. The risk is that cooking smells, noise and clutter spill across the whole room, and that the two functions fight rather than flow. The design job is to keep the openness while giving each activity its own defined place.
Start by zoning the space
Before you choose a single finish, divide the room into zones: cooking and prep, dining, and usually a soft seating or circulation area. Zoning does not mean walls. You define zones with subtle cues so the eye reads separate areas within one space:
- An island or peninsula as the natural divider between the kitchen and the dining or living end.
- A change in lighting, with task lighting over the worktop and a pendant or two over the table.
- A rug to anchor the dining or seating zone and soften acoustics.
- A shift in materials, for example a run of cabinetry against a warmer, more relaxed dining end.
Plan the layout around the working triangle and the services
The kitchen zone still obeys the basics: keep the sink, hob and fridge in a comfortable working triangle so prep is efficient, and leave enough clearance, ideally around a metre, in front of runs and around the island. In a London extension the layout is often dictated by where you can run drainage, gas and extraction, so settle the services early with your builder. Position the hob where an extractor can vent externally, because recirculating filters struggle to clear smells in an open-plan room where the kitchen shares air with the sofa and table.
Island or dining table, or both?
Space decides this. If the room is generous, an island for prep and casual perching plus a separate dining table is the ideal, giving you a working surface and a proper eating space. If it is tighter, a single large table close to the kitchen, or an island with an overhang for stools, may do both jobs. Do not force an island into a room that cannot spare the clearance around it; a cramped island ruins the flow you extended for.
Layer the lighting
Lighting is what makes an open-plan room feel considered rather than strip-lit. Use at least three layers: task lighting under cabinets and over the worktop and island, feature lighting such as pendants over the table to mark the dining zone, and ambient or accent lighting, often on separate dimmable circuits, for the evening. Being able to dim the cooking end while the dining end glows is what lets one room switch from Saturday breakfast to a dinner party.
Choose flooring and acoustics deliberately
A continuous floor across the whole room reinforces the sense of space, and running it out to a glazed rear wall blurs the line to the garden. But hard floors and glazing make open-plan rooms echo, so plan for soft furnishings, a rug in the dining or seating zone, and even acoustic measures in the ceiling if the room is large. Underfloor heating is popular here because it frees the walls of radiators for cabinetry and seating.
Manage sightlines and storage
In an open-plan space the kitchen is always on show, so plan generous, concealed storage to keep worktops clear, and consider a utility room or a tall bank of cupboards to hide the mess. Think about what you see from the sofa and the table: a well-placed island back panel, a run of handleless units or a broken-plan partial divider can keep the working clutter out of the main view without closing the room down.
Common mistakes to avoid
- Skipping external extraction, so cooking smells fill the living zone.
- Forcing in an island with too little clearance around it.
- One flat layer of downlights instead of zoned, dimmable lighting.
- No soft furnishings, leaving the room echoey and cold.
- Not planning enough concealed storage, so the kitchen never looks tidy.
An open-plan kitchen diner ties together two of the rooms we cover in depth. For the cooking zone, see our how to design a kitchen guide, and for the eating zone our how to design a dining room and how to design a living room guides. For help bringing it all together, head back to the Vertigo Interiors homepage.
Frequently asked questions
How do you zone an open-plan kitchen diner? Use an island or peninsula as a physical divider, change the lighting between the cooking and dining ends, anchor the dining zone with a rug, and shift materials subtly between areas. These cues let the eye read distinct zones within one open room without any walls.
How much space do you need for an open-plan kitchen diner? As a rough guide, allow around a metre of clearance around an island and in front of cabinet runs, plus space for a table with chairs that pull out comfortably. If the room cannot spare the clearance for both an island and a table, choose one rather than cramming in both.
How do you stop cooking smells in an open-plan kitchen? Fit a powerful extractor that vents externally rather than a recirculating filter, and position the hob so external ducting is possible. Good ventilation is the single most important factor in a room where the kitchen shares air with the dining and living space.
Should the flooring be the same throughout? A continuous floor makes an open-plan room feel larger and more unified, which is usually the right choice. Zone the space with a rug and lighting instead of a change of floor, and add soft furnishings to control the echo that hard floors create.
Is an open-plan kitchen diner right for a period London home? It can be, and side-return or rear extensions are a popular way to create one. The key is to balance the open, light-filled extension with the character of the original rooms, and to plan services and structural work carefully with a designer and builder.