Create a private, fully serviced living space with our Garden Annexes in Marylebone. We design and build self-contained annexes with insulation, electrics, plumbing, a kitchenette, bathroom and bedroom—ready for year-round use.
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Marylebone homeowners often need extra space without changing postcode or compromising garden character. Our annexes are purpose-built, self-contained buildings with a bedroom, bathroom and kitchenette, ideal for guests, older relatives or a quiet work-and-sleep retreat. We regularly work near Marylebone High Street and Baker Street, where privacy, finish and neighbour considerations matter. Every build is tailored to your plot and the way you want to live.
The Marylebone property mix—Georgian townhouses, mansion blocks and period conversions—brings unique constraints and opportunities. Gardens can be compact, overlooked or accessed via narrow side passages, so we plan layouts and delivery logistics carefully. In the W1 postcodes, we’re used to working around shared boundaries, basement lightwells and mature planting. If you’re in Fitzrovia or close to Regent’s Park, we can match materials and detailing to suit heritage façades and refined outdoor spaces.
Fine Landscaping manages the full journey: survey, concept design, specification, and a clear programme through to handover. Your annexe is built with proper insulation, compliant electrics and plumbing, and ventilation designed for comfortable year-round living. We coordinate trades, keep sites tidy, and communicate progress so you always know what’s happening next. With planning support and a 10-year warranty, Marylebone clients choose us for dependable delivery and premium finishes.
Marylebone sites often have restricted access, controlled parking and close neighbours, so we plan deliveries, working hours and waste removal with care. City of Westminster rules can be stricter around overlooking, height and boundary positioning, especially near mansion blocks and conservation-led streetscapes. We design to protect light and privacy, and we can advise on drainage routes where existing services are complex. Our team is based about 45 minutes away, making site visits and aftercare straightforward.
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Costs vary with size, specification and how far services must be connected. As a guide, a compact self-contained annexe in Marylebone typically starts around £60,000–£90,000. Mid-range builds with premium insulation, bespoke joinery and higher-end bathroom/kitchenette finishes often fall between £90,000–£140,000+. Tight access, structural groundworks and complex plumbing runs in W1 can increase budgets, so we survey and itemise options clearly.
Most garden annexes take around 8–14 weeks on site once designs and specifications are agreed. Larger footprints, bespoke glazing, or higher-end interior fit-outs can extend programmes to 16+ weeks. Timescales also depend on groundworks, service connections (electrics and plumbing), and access constraints common in Marylebone. If planning or prior approvals are needed, allow additional lead time for drawings, submissions and responses.
Some garden buildings can fall under permitted development, but a self-contained annexe with sleeping, bathroom and kitchenette can trigger tighter rules—especially in City of Westminster. Height, boundary distances, use as separate accommodation, and conservation area constraints may all affect what’s allowed. We provide planning support, check your property’s status, and advise whether a lawful development certificate or full application is the safest route before work begins.
We back our garden annexe builds with a 10-year warranty covering workmanship and build integrity, including key construction elements such as structure, insulation performance and weatherproofing. Electrical and plumbing works are carried out by qualified trades and supplied with the relevant certification. We also provide clear care guidance for finishes and external cladding. If any snagging issues arise after completion, we schedule prompt visits to resolve them.
We offer a wide range of design routes, from contemporary pavilion-style annexes to more traditional forms suited to period gardens. Popular exterior options include timber cladding, composite boards, brick slips and high-quality render, with aluminium or timber windows and sliding doors. Inside, we can fit compact kitchenette runs, space-saving bathrooms and built-in storage. We guide you through layouts, finishes and performance upgrades to match your budget and Marylebone setting.
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