Garden Rooms, Gyms & Outbuildings in London
Garden Rooms, Gyms & Outbuildings services across West and North West London, subject to the agreed scope.
Garden Rooms, Gyms & Outbuildings
D-Core designs and builds high-quality garden rooms, gym studios, cinema rooms, annexes, and rear outbuildings across West London and North West London. These are permanent structures that extend your living space without the cost and disruption of a full house extension — and in many cases, without the need for planning permission.
Whether you want a dedicated home gym with rubber flooring and ventilation, a cinema room with acoustic insulation and mood lighting, a playroom for the children, a guest annexe for family visits, or a treatment room for your business — we design each structure to suit its purpose from the ground up.
Every garden room we build is a permanent, insulated structure with full electrics, heating, and quality internal finishes. We also connect drainage for rooms with wet areas (shower, WC, kitchenette). The result is a proper room — not a glorified shed.
What's Included?
Why Choose D-Core?
- Purpose-built for its use — gym rooms need ventilation, cinema rooms need acoustics, annexes need drainage
- Full in-house team: groundworks, carpentry, plastering, finishing
- Bespoke design to match your house and garden style
- Detailed, transparent quotation based on the agreed scope
- Permitted Development advice included at consultation
- A documented build sequence based on the agreed design and specification
Our Process
Consultation & Permitted Development Check
We visit your garden and advise on what can be built under Permitted Development rights, and what may require a planning application. We discuss your intended use, size, access, and preferred aesthetic.
Design & Specification
We design the room layout, propose materials and finishes, and provide a fully itemised quotation based on the agreed scope. Gym, cinema, and annexe rooms have specific requirements we build into the spec from the start.
Groundworks & Structure
Foundations are prepared, the structural frame erected, and the building made weathertight in the planned sequence. Drainage runs are laid at this stage for rooms with wet areas.
Internal Fit-Out & Handover
Insulation, lining, electrics, flooring, decoration, and specialist finishes are completed. We hand over a fully decorated, serviced, and ready-to-use room.
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
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