Open Plan Kitchen Extension: Design Guide
How to design the perfect open plan kitchen extension. Layout options, zoning strategies, and tips for making open plan living work.
Quick Answer
Open plan extensions need 30-50m² for comfortable kitchen/dining/living. Require structural steel when removing walls. Budget £75k-120k including fit-out.
30m²
Min Size
£75-120k
Typical Cost
£2-8k
Steel Beam
Check your specific property constraints
Free Property CheckOpen plan kitchen extensions are the most popular home improvement in London. They transform how families live—cooking, eating, and relaxing in one bright, connected space. But they require careful planning to avoid common pitfalls like noise, smells, and impractical layouts.
Popular Layout Options
Kitchen Island Layout
Central island divides cooking from dining/living. Allows chef to face guests. Needs minimum 1m circulation around island. Most popular for larger extensions.
Galley With Dining End
Kitchen units along walls, dining table at the end near garden doors. Works well in narrower side returns. Good for smaller budgets.
L-Shaped Kitchen
Kitchen in corner, open dining and living area. Often combined with breakfast bar peninsula. Flexible for various room shapes.
Broken Plan
Open plan with partial dividers—sliding doors, half walls, or ceiling drops. Offers flexibility of open plan with ability to close off cooking.
Zoning Your Space
Without walls to define areas, use other techniques to create distinct zones:
Floor Changes
Different flooring materials—tile in kitchen, wood in living. Level changes (consider accessibility).
Ceiling Treatment
Dropped ceiling over kitchen with integrated lighting. Exposed ceiling in living area for height.
Lighting Zones
Different lighting circuits for each area. Pendants over dining, task lights in kitchen, ambient in living.
Furniture Placement
Sofa back defines living area. Rug anchors seating group. Island or table separates kitchen zone.
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Dealing With Cooking Smells
The biggest complaint about open plan kitchens. Good extraction is essential:
- Extract rate: Minimum 12x room volume per hour for open plan
- Ducted extraction: Always better than recirculating—removes odours entirely
- Downdraft or ceiling extractors: For islands without overhead space
- Make-up air: Large extractors need replacement air supply
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Creating open plan usually means removing walls. Load-bearing walls need steel beams (RSJs).
| Opening | Typical Cost |
|---|---|
| Single opening (up to 3m) | £1,500 - £3,000 |
| Large opening (3-5m) | £2,500 - £5,000 |
| Full width beam | £4,000 - £8,000 |
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Frequently Asked Questions
How big does an open plan kitchen need to be?
Minimum 25sqm for comfortable kitchen/dining. 35-50sqm for kitchen/dining/living with island. Under 25sqm can feel cramped when combining multiple functions.
Will open plan affect my heating bills?
Larger spaces take longer to heat but well-insulated new extensions are efficient. Underfloor heating works well—heats entire floor evenly. Zone controls help manage costs.
Can I keep a separate utility room?
Highly recommended. A small utility keeps washing machines, boilers, and cleaning supplies out of sight and reduces noise in your open plan space.
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