Knowing how to design an open-plan kitchen-diner is one of the most useful skills for anyone renovating a London home, where knocking through or extending to create a single sociable space is now the default ambition. Done well, an open-plan kitchen-diner is bright, flexible and perfect for family life and entertaining. Done badly, it can feel like a corridor with a hob in it. This guide walks through the decisions that make the difference: zoning, the island, lighting, extraction, storage and the quirks of period and new-build properties.
Start by planning the zones
An open-plan kitchen-diner is really three spaces sharing one room: a working kitchen, a dining area and, often, a soft seating or living zone. Before choosing a single unit, work out where each belongs. Keep the kitchen's working core, the run between sink, hob and fridge, compact and uninterrupted by through-traffic. Put the dining table where it has room for chairs to pull out and for people to pass behind them, and reserve the calmest corner, usually furthest from the cooking, for sitting. Circulation is the hidden ingredient: leave clear routes so the room flows.
The island as anchor and divider
An island earns its place in open-plan because it does several jobs at once. It adds worktop and storage, it can house the hob or sink, and above all it draws a natural line between the kitchen and the rest of the room without closing anything off. Allow generous clearance around it, ideally a metre or so, so cupboards and appliances can open and people can move past. If the room is too narrow for an island, a peninsula or a slim breakfast bar can define the boundary instead.
Light each zone in layers
Lighting is what makes an open-plan room work after dark. Rather than a single grid of downlights, layer it: bright, focused task lighting over the worktops and island, a pendant or two over the dining table to anchor that zone, and softer ambient and accent lighting in the sitting area. Put the zones on separate switches or circuits so you can turn the kitchen down while the table glows, which instantly makes one big room feel like three considered spaces.
Extraction, storage and calm
Two practical details keep an open-plan kitchen-diner pleasant to live in. The first is extraction: because there is no wall to contain them, cooking smells and steam need a powerful hood, ducted outside where possible, sited right over the hob. The second is storage. An open-plan kitchen is on show all the time, so plan enough concealed storage, and ideally a utility room or pantry nearby, to keep clutter and noisy appliances out of the main space. A calm, uncluttered kitchen is what lets the room feel like a living space rather than a workshop.
Period versus new-build
How you approach the project depends on the house. In a Victorian or Edwardian London home, creating open-plan usually means removing a load-bearing wall, which needs a structural engineer, a steel beam and building control approval, and careful thought about keeping period features like cornicing and fireplaces. In a new-build the space may already be open, so the task is defining zones within it. Either way, the principles hold. For the wider picture, see our guide to designing a kitchen and the interior designer cost guide, or return to the Vertigo Interiors homepage.
Frequently Asked Questions
How much space do you need for an open-plan kitchen-diner?
There is no fixed minimum, but a comfortable open-plan kitchen-diner usually needs enough room for three zones to coexist: a working kitchen, a dining table with chairs pulled out, and clear circulation between them. In a typical London home that often means a knocked-through ground floor or a rear extension. What matters more than raw square metres is a layout that keeps walkways clear and gives each zone its own space.
Do I need building regulations approval to knock through?
Usually yes. Removing a load-bearing wall to open up a kitchen-diner requires building control approval and a structural beam designed for the span, and in a flat or listed building you may need further consents. Always use a structural engineer and check with your local authority before work starts. It is the single most important technical step in most open-plan projects.
How do you stop cooking smells spreading in an open-plan room?
Extraction is the answer. In an open-plan kitchen-diner a powerful extractor hood, ideally ducted to the outside rather than recirculating, is essential to stop cooking smells and moisture drifting into the living and dining zones. Position it directly over the hob, size it for the room, and run it a little before and after cooking.
How do you divide zones without walls?
Use design rather than partitions. A kitchen island, a change in flooring or a rug, different lighting over each zone, and the careful placement of furniture all signal where one area ends and the next begins. Broken-plan touches such as a half-height wall, a shelving unit or a glazed screen can add separation while keeping the open feel.