Add valuable living space with Garden Annexes in Southfields, designed for everyday comfort. We build fully self-contained annexes with a bedroom, bathroom and kitchenette, plus insulation, electrics and plumbing.
Response within 24 hours
A garden annexe is a practical way to create independent space without moving. In SW18, we design and build self-contained annexes that work for guests, older relatives, rental income or a quiet home office. We’re used to projects near Southfields tube station and around Wimbledon Park, where gardens vary from compact to generously sized. Every build includes thoughtful layout planning, high-performance insulation and a clean finish.
The Southfields Grid and surrounding streets feature Victorian terraces, Edwardian houses and 1930s semis, each with different access and garden levels. We tailor foundations, drainage and positioning to suit your plot and to protect neighbouring boundaries. If you’re in Wimbledon Park, Earlsfield or Putney, we’ll design an annexe that matches the character of your home while maximising light and privacy. Our team also plans routes for services so electrics and plumbing integrate neatly.
We start with a site visit, then produce a clear design and specification covering the bedroom, bathroom and kitchenette. You’ll get transparent staging, tidy working practices and regular updates from a dedicated project lead. We coordinate qualified trades for electrics and plumbing, and we can support you with planning and permitted development checks. Homeowners choose us for consistent workmanship, reliable scheduling and a finish that’s built to last.
Across the London Borough of Wandsworth, access can be tight and parking controlled, especially near Southfields tube station and King George's Park. We plan deliveries, waste removal and working hours to minimise disruption. Many Southfields gardens sit behind side returns or narrow passages, so we design modular elements and sensible build sequences. Ground conditions and drainage vary street to street, so we assess levels and soakaway potential early.
Rated 4.9/5 from over 280 verified reviews
For garden annexes in Southfields, budgets commonly start around £45,000–£70,000 for a compact insulated shell with electrics. A fully self-contained annexe with kitchenette, bathroom, plumbing, heating and higher-end finishes is often £80,000–£140,000+. Costs depend on size, groundworks, drainage runs, glazing, roof type, and specification (tiles, cabinetry, flooring). We provide a detailed itemised quote after a site survey in SW18.
Most builds take around 8–14 weeks on site once the design is agreed and materials are ordered. Larger annexes with a full bathroom, kitchenette, bespoke joinery and more complex plumbing can run 14–20 weeks. Timescales are affected by access in the Southfields area, groundworks, utility connections, weather, and whether planning approval is required. We’ll give you a realistic programme and keep you updated throughout.
Many garden buildings can be delivered under permitted development, but a self-contained annexe with sleeping, bathroom and kitchenette can change what’s allowed. In the London Borough of Wandsworth, rules may also be influenced by height, proximity to boundaries, conservation considerations and how the space will be used. We review your property, advise on the best route, and provide planning support where needed, including drawings and documentation.
We provide a 10-year warranty on our garden annexe builds, covering workmanship and key structural elements installed by our team. This includes the building envelope, insulation performance as specified, and core construction details. Electrical and plumbing works are completed by qualified trades and supplied with the relevant certification, with manufacturer warranties applying to fixtures and appliances. We also offer a clear snagging process after completion.
You can choose from contemporary cladding (cedar, composite, or rendered finishes), flat or pitched roofs, and a range of glazing options such as sliding doors or corner windows. Inside, popular choices include underfloor heating, acoustic insulation, microcement or tiled bathrooms, and compact kitchenette layouts with integrated appliances. We guide you through options to suit your budget, privacy needs and the style of nearby homes in the garden annexes Southfields area.
Get your free, no-obligation quote today.