About MBT Group
London’s specialist house extension builders, dedicated to transforming homes through structural expertise, clear project management, and quality craftsmanship.
LONDON-BASED
Residential building specialists
EXTENSION EXPERTS
House & renovation specialists
PROJECT SUPPORT
Planning & build support
TRANSPARENT VALUE
Clear quotations & managed projects
FULLY INSURED
Fully insured trades & trusted workmanship
We believe a house extension should be more than just added square footage it should fundamentally improve how you live.
MBT Group was founded on a simple premise: residential building should be professional, transparent, and structured. We move away from the "general builder" approach to focus exclusively on high-impact house extensions and home transformations. We know that when you hire us, you aren't just buying construction you are trusting us with your home, your family’s daily routine, and your most significant financial asset.
Clear Communication
1
We provide structured updates, honest timelines, and realistic expectations from the first site survey to the final handover.
Structural Integrity
2
Whether it’s clear-span steel frames or complex drainage work, we prioritize the foundational health of your home above all else.
Quality Finish
3
An extension is only as good as the finish. We coordinate elite trades to ensure the new space feels like a seamless, premium part of your home.
Why London Homeowners Choose MBT Group?
Many builders focus on the speed of the build. We focus on the quality of the life you live after we leave. Our team understands the specific nuances of London period properties, local planning tracks, and the practicalities of expanding a home while you live in it. We don't just build shells; we deliver finished, ready-to-use spaces that add long-term value to your lifestyle and property.
Frequently Asked Questions
How much does a house extension cost in London?
The cost depends on the size of the extension, specification, structure, access, finishes and whether planning or structural work is required. After a site visit, MBT Group can provide a clearer quotation based on the property and the work involved
Do I need planning permission for a house extension?
Some house extensions can be carried out under permitted development rights, while others need planning permission. This depends on the size, location, property type and previous extensions. MBT Group can help guide you on the likely route before work begins.
Can I live in my home during the extension?
In many cases, yes. It depends on the scale of the work, whether services are being disrupted and how much of the property is affected. We will discuss this during the planning stage so expectations are clear
How long does a house extension take?
A typical single storey extension may take several months depending on size, complexity, approvals, weather, access and finishes. Larger wraparound or double storey extensions can take longer
Does MBT Group handle the full project?
MBT Group can support the process from early consultation through to construction and completion, including coordination with designers, structural input and relevant trades