If you’re planning to expand your home, understanding the kitchen extension cost in London is one of the first steps in making an informed decision. Whether you’re considering a side return extension, a rear extension, or a wrap-around extension, costs can vary depending on the size, design, materials, and complexity of the project.
In this guide, we’ll compare the three most popular kitchen extension types, explain the factors that influence pricing, and help you decide which option offers the best value for your home.
Kitchen Extension Costs in London at a Glance
| Extension Type | Average Cost (2026) | Best For | Typical Build Time |
| Side Return Extension | £35,000–£60,000 | Victorian & Terraced Homes | 8–12 Weeks |
| Rear Extension | £45,000–£80,000 | Family Homes | 10–16 Weeks |
| Wrap-Around Extension | £70,000–£120,000+ | Large Open-Plan Living | 14–20 Weeks |
These figures are general estimates. Final costs depend on your property’s size, location, specifications, and structural requirements.
What Is the Average Kitchen Extension Cost in London?
The average kitchen extension cost in London typically ranges between £35,000 and £120,000, depending on the type of extension and the quality of finishes you choose.
Your quotation may include:
- Design and planning
- Groundworks and foundations
- Structural steel installation
- Brickwork and roofing
- Windows and doors
- Electrical and plumbing work
- Plastering and decorating
- Flooring
- Kitchen installation (if included)
Choosing an experienced builder ensures the project is completed safely, complies with Building Regulations, and stays within budget.
Side Return vs Rear vs Wrap-Around Kitchen Extensions
Side Return Kitchen Extension
A side return extension makes use of the unused space beside many Victorian and Edwardian terraced properties. It is one of the most cost-effective ways to create a brighter and more functional kitchen.
Advantages
- Lower construction costs
- Ideal for narrow properties
- Improves natural light
- Excellent for open-plan kitchen layouts
Considerations
- Limited additional floor space compared to larger extensions
- Not suitable for every property
Rear Kitchen Extension
A rear extension extends the back of your home, creating additional living space and allowing for a larger kitchen, dining area, or family room.
Advantages
- Creates a spacious kitchen
- Suitable for most detached and semi-detached homes
- Adds strong resale value
- Flexible design options
Considerations
- Higher construction costs
- Larger projects may require planning permission
Wrap-Around Kitchen Extension
A wrap-around extension combines both a side return and rear extension to maximise available space.
This option is ideal for homeowners looking to create a large open-plan kitchen, dining, and living area.
Advantages
- Maximum additional living space
- Highly desirable for modern family homes
- Excellent natural light opportunities
- Significant increase in property value
Considerations
- Highest overall cost
- Longer construction period
- More complex structural work
What Affects Kitchen Extension Costs?
Several factors influence the final cost of a kitchen extension.
Property Size
Larger extensions require more labour, materials, and structural work.
Design Complexity
Features such as roof lanterns, large sliding doors, bespoke glazing, and vaulted ceilings increase construction costs.
Structural Requirements
Many projects require steel beams (RSJs), foundation strengthening, or drainage alterations, which affect the overall budget.
Materials
Premium brickwork, aluminium doors, natural stone flooring, and luxury kitchen finishes cost more than standard alternatives.
Location
Construction costs across London can vary depending on the property’s location, accessibility, parking restrictions, and local labour rates.
Which Kitchen Extension Is Right for Your Home?
The best option depends on your available space, budget, and long-term plans.
Choose a Side Return Extension if you:
- Own a Victorian terrace
- Want a cost-effective extension
- Need a brighter kitchen without extending too far into the garden
Choose a Rear Extension if you:
- Want more family living space
- Have sufficient garden depth
- Need a larger kitchen and dining area
Choose a Wrap-Around Extension if you:
- Want a complete ground-floor transformation
- Plan to stay in your home for many years
- Want the largest increase in usable space
Does a Kitchen Extension Increase Property Value?
In many cases, a well-designed kitchen extension can significantly improve both the functionality and market appeal of your property.
Modern buyers often prioritise open-plan living, natural light, and spacious kitchens. A professionally built extension can make your home more attractive while increasing its overall value.
Beyond financial benefits, a larger kitchen also improves everyday living by creating more space for cooking, dining, entertaining, and family activities.
Planning Permission and Building Regulations
Not every kitchen extension requires planning permission. Many smaller extensions fall under Permitted Development rights, provided they meet specific size and design criteria.
However, Building Regulations approval is generally required to ensure the work meets structural, insulation, electrical, plumbing, and fire safety standards.
An experienced contractor can guide you through planning requirements, building control, and project management from start to finish.
Why Choose SBDS Construction Ltd?
At SBDS Construction Ltd, we specialise in high-quality kitchen extensions in London designed to suit your property, lifestyle, and budget.
Our team manages every stage of the project, from the initial consultation and site survey through to construction and final handover.
When you choose SBDS Construction Ltd, you benefit from:
- Free quotations
- Transparent pricing
- Experienced London builders
- High-quality workmanship
- Premium materials
- Dedicated project management
- 3–5 year written warranty
If you’re also considering expanding your property’s footprint, explore our Side Extension Services to see how we can help create additional living space with a seamless design.
Frequently Asked Questions
How much does a kitchen extension cost in London?
Most kitchen extensions in London cost between £35,000 and £120,000, depending on the extension type, size, finishes, and structural requirements.
Is a side return extension cheaper than a rear extension?
Yes. A side return extension is generally more affordable because it uses existing side space and usually requires less structural work than a larger rear extension.
Which kitchen extension adds the most value?
A well-designed rear or wrap-around extension often adds the greatest value by creating larger open-plan living spaces that appeal to modern buyers.
Do I need planning permission for a kitchen extension?
Some kitchen extensions can be built under Permitted Development rights, while larger or more complex projects may require planning permission. Building Regulations approval is typically required.
How long does a kitchen extension take?
Most kitchen extensions take between 8 and 20 weeks, depending on the size, complexity, weather conditions, and project specifications.
Start Planning Your Kitchen Extension
Choosing the right kitchen extension is about balancing your budget, available space, and future needs. Whether you’re considering a side return, rear, or wrap-around extension, working with an experienced construction company helps ensure the project is completed safely, efficiently, and to a high standard.
If you’re planning a kitchen extension in London, contact SBDS Construction Ltd for a free consultation and detailed quotation. Our experienced team can help you design and build a practical, stylish extension that enhances both your home and its long-term value.