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Are you running out of room in your London home but not ready to move? A house extension could be the perfect solution to create the extra space you need, without saying goodbye to the home and neighbourhood you love.
At MBT Group, we know how important it is to understand the financial side of your home project. That’s why we’ve created this clear, helpful guide to house extension costs in London, tailored to help you plan confidently and avoid hidden surprises.
Why Choose a House Extension?
London homeowners are increasingly turning to house extensions as a way to upgrade their living space. Whether it’s an open-plan kitchen, a home office, a guest suite, or even a double-storey addition, extensions offer:
- Increased property value
- Enhanced functionality
- A personalised living environment
- Cost-effective expansion vs moving
As one of the leading house extension companies near London, MBT Group is here to deliver quality results that reflect your vision and lifestyle.
What Affects the Cost of a House Extension in London?
The cost of a house extension in London can vary greatly depending on several factors. Here’s what influences the final price:
1. Type of Extension
- Single-storey rear extension: Typically costs between £1,800 – £2,500 per m²
- Double-storey extension: Adds more value per square metre, with costs starting at around £2,000 – £3,000 per m²
- Wraparound extensions: Combine side and rear expansions and are more complex, typically costing upwards of £2,500 per m²
2. Size of the Extensio
More space means more materials and labour. A small 20m² extension might start from £40,000, while larger builds can exceed £100,000+.
3. Finishes and Materials
From basic fittings to luxury finishes, your interior choices significantly affect costs.
4. Planning and Regulations
Some projects may require planning permission, structural calculations, and building control approval, which can add fees to the budget.
5. Site Conditions
Access, groundwork complexity, drainage, and existing structures can also impact pricing.
Typical House Extension Cost Estimates (2025)
|
Extension Type |
Average Cost Range |
|
Single-storey (20m²) |
£40,000 – £60,000 |
|
Double-storey (40m²) |
£80,000 – £120,000 |
|
Kitchen Extension |
£50,000 – £90,000 |
|
Loft + Rear Extension Combo |
£90,000 – £150,000+ |
These figures are general estimates. MBT Group provides detailed, transparent quotes for each project to ensure our clients always know what to expect.
How MBT Group Stands Out
As one of the most trusted house renovation contractors in London, MBT Group brings experience, creativity, and craftsmanship to every project. Whether you’re considering home remodeling near London or a full-scale renovation, we offer:
- End-to-end project management
- Bespoke architectural design
- Transparent pricing with no hidden fees
- Skilled tradespeople and timely delivery
- Assistance with planning permission and compliance
More Than Just Extensions
Looking for home renovation services in London? MBT Group also specialises in:
- Full house refurbishments
- Kitchen and bathroom renovations
- Interior remodeling
- Structural alterations
- Energy-efficient upgrades
Our renovation team brings life to tired spaces, making them modern, functional, and beautiful—all with minimal disruption to your day-to-day life.
Why Choose MBT Group?
✔️ Fully insured and certified
✔️ Over a decade of experience
✔️ Honest, upfront pricing
✔️ Rated highly by homeowners across London
✔️ A trusted name among house extension companies near London
We don’t just build—we collaborate. We listen carefully to your needs, and we bring your vision to life with professional skill and creativity.
Ready to Expand Your Living Space?
If you’re thinking about extending or renovating your London home, don’t leave it to chance. Trust MBT Group—your dedicated house renovation contractor in London—to deliver stunning, practical results that fit your budget and exceed your expectations.
Contact us today for a free consultation and quote tailored to your property.
