Add flexible living space without moving with Garden Annexes in Westminster. We design and build self-contained annexes with insulation, electrics, plumbing, a kitchenette, bathroom and bedroom—finished to a premium standard.
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A garden annexe is a practical way to create independent space for guests, older relatives, a live-in nanny or a quiet working base. In Westminster, where homes sit close to landmarks like Westminster Abbey and St James’s Park, every square metre matters. We build self-contained annexes that feel like a small home, not a glorified shed. Expect smart layouts, strong insulation and a finish that suits high-value properties in SW1.
The City of Westminster includes Georgian townhouses, mansion flats and luxury apartments, often with compact rear gardens or courtyard-style outdoor space. In areas such as Victoria and Pimlico, access can be tight and neighbouring boundaries are close, so careful design and considerate construction are essential. We tailor foundations, sound control and positioning to protect existing structures and privacy. The result is an annexe that looks intentional, proportionate and built to last.
Our process starts with a site visit, measured survey and clear scope, followed by concept layouts, specification and a fixed programme. We handle insulation, electrics and plumbing in-house coordination, plus planning support where required. You’ll get tidy working practices, clear communication and staged sign-off as the build progresses. Homeowners choose Fine Landscaping because we deliver premium detailing and back it with a 10-year warranty.
Westminster sites often involve restricted access, controlled parking and strict working hours, especially near Whitehall and around SW1. We plan deliveries, waste removal and neighbour liaison to keep disruption low. Many gardens sit over services or near basement structures, so we survey routes, drainage and load paths before finalising foundations. Our garden annexes Westminster area builds are designed to complement period façades and high-end finishes.
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In Westminster, garden annexes typically range from £45,000–£120,000+, depending on size, specification and site constraints. A compact insulated studio with electrics may start lower, while a fully self-contained unit with kitchenette, bathroom, bedroom, premium glazing and bespoke joinery sits higher. Costs can rise with difficult access, structural groundwork, higher-end cladding, and upgraded heating or ventilation. We provide a detailed, itemised estimate after survey.
Most builds take around 8–14 weeks from start on site, with design and approvals adding time beforehand. Simpler shells and fit-outs can be quicker, while fully self-contained annexes with bathroom plumbing, kitchenette installation and bespoke interiors take longer. Timescales are affected by access in SW1, foundation requirements, utility connections, and lead times for windows, doors and finishes. We agree a clear programme and keep you updated weekly.
Some garden annexes can fall under permitted development, but this depends on height, placement, use and whether the property is listed or in a conservation area—both common in the City of Westminster. If the annexe is truly self-contained, planning requirements can be more likely. We review your site, check constraints, and provide planning support with drawings and documentation where needed, so you proceed with confidence and compliance.
We provide a 10-year warranty covering structural workmanship and installation quality for the annexe build. This includes the building fabric, insulation performance as installed, and key construction elements such as cladding, roofing and internal finishes, subject to normal use and maintenance. Electrical and plumbing works are completed by qualified trades and certified accordingly. If an issue arises, we respond quickly and put it right under warranty terms.
You can choose from contemporary or traditional designs to suit Westminster homes, including timber cladding, composite boards, brick slips or rendered finishes. Internally, popular options include underfloor heating, acoustic insulation, skylights, pocket doors and built-in storage. Kitchenettes can be compact galley layouts, and bathrooms can be wet rooms or full suites. We guide you through layouts, finishes and durability so the annexe matches your lifestyle and property.
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