Double Storey Extensions in London
Add space across two floors with a carefully planned double storey extension.
A double storey extension can add significant space to a home by extending both the ground floor and first floor simultaneously.
This can be a strong option for families who need more living space downstairs and additional bedrooms or bathrooms upstairs.
MBT Group helps homeowners plan and build double storey extensions with proper attention to structure, planning layout metrics, and premium finishing.
Double Storey Architectural Focus
Expanded Living Footprints
Maximize your entry plan. Reconfigure the lower tier to unlock sprawling open-plan kitchens, light-filled dining configurations, or separate playroom zones that directly step out onto your garden space.
Bedrooms & Luxury Ensuites
Avoid the costs of relocating. We extend the first floor to seamlessly introduce spacious master bedrooms, premium walk-in wardrobes, private home offices, or luxury ensuite bathroom configurations.
Cohesive Material Matching
A multi-floor expansion must look native to the property. We carefully source matching brickwork, custom cladding, or bespoke roofing parameters to blend the old and new structural spaces seamlessly.
Structural & Architectural Priorities
- Optimizing structural load distributions down to foundations
- Bespoke positioning of vertical window frames and privacy glass
- Achieving flush, clear transitions between original and new ceilings
- Maximizing long-term market value with balanced layout plans
- Coordinating complex plumbing, heating lines, and electrical feeds
- A build framework fully managed from conceptual planning to handover
Planning Requirements & Structural Design
Because multi-floor structures completely alter a property's profile, they are much more likely to require formal planning permission. Key considerations include the overall structural impact on neighbours, daylight vectors, boundary privacy, and building heights.
Since the work spans multiple levels, deep foundations, load-bearing walls, structural steel frame integrations, and roof re-engineering require strict UK Building Regulations adherence. MBT Group manages the engineers, designers, and council inspectors step-by-step.
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