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MBT Group Guide to House Extension Costs in London
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London Single Storey Extension Cost Breakdown for Homeowners
In a city like London, where space is limited and property prices are high, a single-storey extension is one of the most cost-effective ways to gain more room and add value to your home. Whether you're dreaming of a larger kitchen, a home office, or a bright new living area, a single-storey extension can transform how you live.
But what does it cost? And how do you avoid unexpected fees and frustrating surprises?
At MBT Group, we specialise in delivering transparent, high-quality home extensions. In this guide, we’ll break down the single-story extension cost, explore popular options like the side return extension London homeowners love, and explain why we’re among the most trusted extension builders near London.
What Is a Single Storey Extension?
A single-storey extension adds new ground-level space to your existing home. It’s perfect for creating:
- An open-plan kitchen-diner
- A spacious living room or entertainment area
- A utility room or home office
- A ground-floor bedroom with an en-suite
The flexibility and relative affordability of these extensions make them a top choice for London homeowners looking to improve their homes without relocating.
Average Single Story Extension Cost in London (2025)
The cost of a single storey extension in London varies depending on size, design, and finishes. Here's a general breakdown:
|
Extension Type |
Average Cost per m² |
Typical Total Cost (20m²) |
|
Basic Finish |
£1,800 – £2,200 |
£36,000 – £44,000 |
|
Mid-Range Finish |
£2,200 – £2,800 |
£44,000 – £56,000 |
|
High-End Finish |
£2,800 – £3,500+ |
£56,000 – £70,000+ |
These prices include foundations, construction, electrics, plumbing, plastering, and internal finishes.
At MBT Group, we provide clear, all-inclusive quotes. No vague “starting from” prices. No hidden fees. Just transparent pricing that lets you plan with confidence.
What Affects the Cost?
Several key factors influence your total extension cost:
1. Extension Type
- Rear Extension: Straightforward and common for creating larger kitchens or living areas.
- Side Return Extension: Popular in terraced homes, a side return extension in London makes use of the narrow alleyway beside the house to open up your kitchen or dining space.
- Wraparound Extension: Combines rear and side return extensions for maximum space.
2. Size and Layout
Larger extensions cost more but offer better value per square metre. A good design can significantly increase the functionality and aesthetics of your home.
3. Finishes and Features
Underfloor heating, bi-fold doors, skylights, or luxury fittings will increase costs but can add style and long-term value.
4. Access and Site Conditions
Limited site access, sloped gardens, or drainage issues can add complexity and cost.
Why Choose MBT Group for Your Extension?
As leading extension builders near London, MBT Group brings unmatched experience, quality craftsmanship, and a no-nonsense approach to every project.
Here’s what sets us apart:
- Upfront Pricing: We offer transparent quotes with no surprise charges. What you see is what you pay.
- End-to-End Service: From planning permission and design to construction and completion, we manage everything in-house.
- Custom Designs: Your lifestyle and needs are at the heart of every build. We don’t do “cookie-cutter” extensions.
- Dedicated Team: Our expert builders, architects, and project managers work together to deliver on time and within budget.
- High Client Satisfaction: We’re proud of our reviews and repeat clients across Greater London.
Popular Design: Side Return Extension London
Many single storey extensions fall under permitted development, meaning planning permission isn't required if certain criteria are met. However, it’s essential to comply with building regulations and local guidelines. MBT Group will handle all necessary permissions and approvals, so you don’t have to worry.
How to Get Started
We make it easy to begin your extension journey:
- Book a Free Consultation
Tell us about your ideas and goals. We'll visit your property and offer expert advice. - Get a Transparent Quote
We provide a fully itemised quote—no vague pricing, no hidden charges. - See the Design Come to Life
We’ll create a detailed plan tailored to your home and vision. - Build with Confidence
Our team gets to work, keeping you informed every step of the way.
Final Thoughts
Adding a single-storey extension is one of the smartest ways to improve your London home’s value, comfort, and functionality. And when you work with MBT Group, you get the added benefit of experience, reliability, and no hidden fees.
If you're ready to work with one of the most trusted extension builders near London, get in touch with us today.
Contact MBT Group now for a free, no-obligation consultation. Let’s build something amazing together.
