Add flexible living space with Garden Annexes in Downham, designed for real day-to-day comfort. From insulated builds to electrics, plumbing, kitchenette and bathroom, we deliver a fully self-contained annexe that feels like part of your home.
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Downham homeowners often need extra space without moving—whether for older relatives, grown-up children, or a quiet home-working base. Our garden annexes are built as true, self-contained accommodation with a bedroom, bathroom and kitchenette. We regularly work near Downham Fields and around BR1, so we understand typical plot sizes and access constraints. The result is a comfortable annexe that’s practical, private and built to last.
The Downham estate includes 1920s cottage homes, 1930s semis and post-war housing, each with different garden proportions and services layouts. We design annexes to suit narrower side access, shared boundaries and existing patios or outbuildings. If you’re close to Grove Park or Bellingham, we’ll factor in neighbouring sightlines and daylight to keep the space bright and compliant. Our approach keeps the annexe in scale with your home and garden.
We manage the project from survey and concept design through to installation, testing and final handover. You’ll get clear specifications for insulation, electrics and plumbing, plus a tidy, well-sequenced build programme. Planning support is included, so you know where you stand before work begins. Local clients choose us for consistent workmanship, transparent communication and a finish that looks considered rather than ‘bolted on’.
Across the London Borough of Lewisham, Downham plots often have practical rear access but limited side clearance, so we plan deliveries, parking and waste removal carefully. Ground conditions can vary between made-up ground and compacted clay, so we specify suitable foundations and drainage. We also design around established boundaries and mature planting common near community facilities like Downham Health and Leisure Centre. The build is adapted to your home’s era, from 1920s cottages to post-war houses.
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For Garden Annexes in Downham, most homeowners budget from around £55,000–£120,000+ depending on size, specification and site access. A compact studio-style annexe with a shower room typically sits at the lower end, while a larger one-bedroom layout with upgraded finishes, higher insulation spec and more complex plumbing/electrics moves the cost up. Groundworks, drainage runs and bespoke glazing can also affect the total.
Typical build times are 8–14 weeks on site once designs and approvals are in place. Smaller annexes with straightforward access and short service runs can complete faster, while larger builds with bathrooms, kitchenette fit-outs and more complex foundations may take longer. Timescales are also influenced by planning or permitted development checks, lead times for windows/doors, and whether we need to upgrade electrics or extend drainage to the main house.
Some garden buildings can be permitted development, but a self-contained annexe with sleeping and cooking facilities can trigger tighter rules, especially around use and size. In the London Borough of Lewisham, we check constraints such as conservation considerations, height limits, boundary distances and any previous extensions. We provide planning support, advise on the best route, and can prepare the information needed for an application where required.
We provide a 10-year warranty covering workmanship and the structural integrity of the build, including the main shell, insulation installation and weatherproofing details. Electrical and plumbing works are carried out to current standards and supplied with the relevant certification. If an issue arises, we respond quickly and put it right in line with the warranty terms. Product warranties for specific components (such as windows) are also passed on.
We offer a wide range of options, from contemporary timber cladding to low-maintenance composite finishes, plus brick or render details to complement 1930s semis. Inside, you can choose integrated kitchenette layouts, shower rooms or full bathrooms, and built-in storage for the bedroom area. Glazing can be configured for privacy or maximum light, depending on neighbours and orientation. We guide you through choices to balance style, budget and long-term durability.
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