That Victorian terrace in Colliers Wood deserves foundations built to last another century. From extensions pushing into tight gardens to complete rebuilds navigating the area's notorious clay soil, proper groundwork makes all the difference.
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Colliers Wood's mix of period properties and newer developments sits on particularly challenging ground. London clay combined with varying water table levels means foundation work here requires genuine expertise. Whether you're extending a 1930s semi off Cavendish Road or starting fresh on a knocked-down plot near Tandem Way, getting the concrete right determines everything that follows.
Strip foundations, raft slabs, or piled solutions – each property demands its own approach. Ground investigation reveals surprises beneath SW19's surface: old wells, wartime rubble, forgotten cellars. Modern concrete mixes incorporate fibres and waterproofing agents specifically chosen for local conditions. Reinforcement calculations factor in both current loads and future possibilities, because nobody wants to dig twice.
Twenty years working between Mitcham's chalk deposits and Wimbledon's gravel beds taught us plenty about Colliers Wood's quirks. Local building control knows our work meets their standards first time, every time.
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Single-storey rear extensions typically run £8,000-£15,000 including excavation and concrete. Double-storey projects or those hitting difficult ground conditions might reach £20,000-£30,000. Every quote reflects actual site conditions after proper investigation.
Absolutely – from the industrial conversions near Colliers Wood station to the residential streets bordering Wandle Park. Also regularly working in neighbouring Tooting, Mitcham and Wimbledon when ground conditions require our specific expertise.
Excavation through concrete pour usually completes within 5-7 working days for standard extensions. Curing time adds another week before building upwards. Complicated sites with dewatering or piling might extend this by several days.
Each foundation carries decade-long protection against settlement or structural failure. This covers materials, workmanship, and design calculations. Full documentation provided for mortgage lenders and surveyors.
Investigation usually reveals the answer – many inter-war properties have surprisingly robust footings. Trial pits expose foundation depth and condition. Sometimes underpinning allows upper floor additions; other times starting fresh proves more economical. Structural engineer assessments determine the safest route forward.
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