House Extensions in London
House Extensions services across West and North West London, subject to the agreed scope.
House Extensions
An extension can change how a property is used without moving. D-Core Construction works on single and double-storey extensions across West London, with scope agreed for each project.
Types of Extensions
We build all common extension typologies, adapting the design to your property's constraints:
- Single-storey rear extensions: Often used for open-plan kitchen diners, with glazing and roof options selected for the property.
- Side-Return Extensions: Utilise the dead space at the side of Victorian and Edwardian terraces. While often narrow, they dramatically widen the rear rooms.
- Wraparound Extensions: Combining rear and side extensions to create a massive L-shaped addition, fundamentally changing the ground floor layout.
- Double-Storey Extensions: Add living space downstairs and additional bedrooms or bathrooms upstairs. These require careful planning regarding boundary lines and neighbours' light.
Feasibility & Permissions
Feasibility, planning permission and Permitted Development depend on the property, design and site. Appointed professionals and the relevant authority advise and decide on the route. Where agreed, D-Core coordinates relevant parties. Learn more in our Planning & Pre-Construction Hub.
Structural, Party Wall & Build-Over Coordination
Removing existing walls may require structural design and steelwork. Appointed structural engineers advise on calculations. Work near a shared boundary may engage the Party Wall Act, and extensions built near or over public sewers may conditionally require a Thames Water Build-Over Agreement. Appointed professionals advise on notices and applications. Discover more in our Planning Hub.
Programme Drivers & Living In During the Build
The construction sequence and overall programme are driven by ground conditions, structural complexity, approvals, weather, and the specification of finishes. Whether you can stay in the property depends on the scope, access, services and site safety. The proposed sequence and practical arrangements can be discussed before work begins.
What's Included?
Why Choose D-Core?
- We coordinate structural engineers and architects
- Detailed, itemised quotations based strictly on agreed scope
- Strict adherence to Building Control and safety standards
- Respectful site management for you and your neighbours
- Direct communication with the team running your project
Our Process
Initial Feasibility
A site visit may be arranged to discuss your property, goals and potential planning or structural constraints.
Design & Approvals
Where agreed, we coordinate appointed professionals; they advise on plans, planning routes and structural calculations.
Groundworks & Structure
Foundations are poured, drainage altered, and the structural shell built, including the installation of load-bearing steelwork.
Weatherproofing & Fit-Out
The roof is pitched or laid flat, windows/doors installed, followed by internal studwork, insulation, plumbing and electrical preparation.
Finishes & Handover
Plastering, flooring and decoration are completed, followed by a walkthrough against the agreed scope.
Related Case Studies
Local House Extensions Guides
Evidence-led guidance for areas where a relevant project example is already available.
Pricing Guidance
Project costs depend on size, specification, existing conditions, and the required scope of works. A detailed quotation can be provided once the project requirements and site constraints have been reviewed.
For an accurate, detailed quote for your specific project, please contact us for a free site visit.
Frequently Asked Questions
Request a Quote
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