The kitchen is the heart of the home, and for many UK homeowners, having a kitchen extension is one of the most transformative and rewarding improvements you can make. Whether you’re dreaming of an open-plan space for entertaining, a bright family hub, or simply a bit more room to breathe, a kitchen extension can dramatically enhance how your home feels and functions.
Here’s your complete guide to kitchen extensions in the UK, covering everything from costs and designs to planning permission and hiring the right contractor.
Types of Kitchen Extensions for UK Homes
The right extension style for your kitchen will depend on your property type, budget, and lifestyle. Here are the most common options:
1. Rear Kitchen Extension
Ideal for terraced or semi-detached homes. Extends out from the back of the house to create more space for cooking, dining or living.
2. Side Return Extension
Perfect for Victorian and Edwardian terraces with an unused alleyway at the side. These slim extensions can make a surprisingly big difference.
3. Wraparound Extension
Combines a rear and side return for maximum impact. Creates a large, L-shaped kitchen/living/dining space—great for open-plan living.
4. Double-Storey Kitchen Extension
More complex and expensive, but adds valuable space on both ground and upper floors. Popular when you need an extra bedroom as well.
5. Orangery or Glazed Extension
Stylish and light-filled, these are often used to blend indoor and outdoor space. Can be a great way to add character as well as function.
How Much Does a Kitchen Extension Cost?
Kitchen extension costs vary widely based on size, location, and finish level, but here are average 2025 UK figures:
- Basic single-storey rear extension: £1,800–£2,500 per m²
- Side return extension: £40,000–£65,000
- Wraparound extension: £70,000–£100,000+
- Double-storey extension: £100,000–£140,000+
Additional costs to budget for:
- Kitchen units and appliances
- Plumbing, electrics, heating
- Glazing (e.g. bi-fold doors or roof lights)
- Finishes (flooring, lighting, decoration)
- Professional fees (architects, structural engineers, planning)
Tip: Always factor in a 10–15% contingency for unexpected expenses.
Design Ideas for Modern Kitchen Extensions
Looking for inspiration? Modern kitchen extensions can be stylish, space-saving and family-friendly. Here are some current trends:
- Open-plan layouts – Combine kitchen, dining and lounge zones for a sociable flow.
- Large glazing and bi-fold doors – Bring in natural light and connect the indoors with the garden.
- Statement islands – Create a focal point that’s great for cooking and conversation.
- Minimalist cabinetry – Sleek handleless units keep the look clean and contemporary.
- Zoned lighting – Pendant lights over islands, recessed ceiling lights, and under-cabinet LEDs.
Pinterest-worthy kitchens don’t have to cost the earth, thoughtful design makes all the difference.
Planning Permission and Building Regulations for Kitchen Extensions
Do you need planning permission?
In many cases, a kitchen extension falls under permitted development, meaning you don’t need full planning permission. However, the extension must:
- Be no more than 3m deep (semi-detached or terraced) or 4m (detached)
- Not exceed half the garden area
- Be built with materials similar to the existing house
- Not be higher than the existing roof
- Always check with your local council
Building regulations
Regardless of whether you need planning permission, you must comply with building regulations for:
- Foundations and structural integrity
- Fire safety
- Ventilation and damp proofing
- Energy efficiency
- Plumbing and electrics
Work must be signed off by either your council’s Building Control team or an approved inspector (such as London Building Control).
Tips for Hiring the Right Contractor for Your Kitchen Extension
Choosing the right builder or contractor can make or break your project. Here’s how to find someone reliable:
- Check accreditations – Look for TrustMark, FMB (Federation of Master Builders), and check reviews.
- Ask for references – Speak to previous clients or view past projects.
- Confirm insurance and guarantees – Make sure your builder has public liability and structural warranties.
- Use a contract – Always agree payment terms, scope of work, and timelines in writing.
Bonus: Consider working with a design-and-build company for a more streamlined, all-in-one experience.
Final thoughts: A kitchen extension is more than just extra space, it’s an investment in how you live. With careful planning, a clear budget, and the right team, your new kitchen can transform your home into something truly special. For more information contact us today!
