Building on Colliers Wood's tricky clay soil requires more than just digging holes. From Victorian terraces along Christchurch Road to newer developments near the Tandem Centre, proper foundation work determines whether your extension stands strong for decades.
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SW19's mixture of London clay and historic river deposits creates unique challenges beneath every property. Those charming Edwardian homes scattered between the Northern Line and Wandle River often sit on foundations that shift with seasonal moisture changes. Modern building regulations demand deeper, more resilient footings than our predecessors ever imagined necessary.
Ground investigation reveals hidden obstacles - old air raid shelters, forgotten wells, Victorian sewage pipes running at odd angles. Reinforced concrete beams bridge weak spots while proper drainage channels prevent water accumulation that destabilises clay. Each excavation tells a story, whether uncovering remnants of Merton Priory's medieval walls or navigating around protected tree roots from Wandle Park's ancient oaks.
Twenty-three years digging beneath Colliers Wood has taught us which streets hide the trickiest ground conditions. Local structural engineers regularly recommend our work because they know we understand SW19's geological quirks better than contractors who simply follow standard specifications.
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Single-storey rear extensions usually require £8,000-£15,000 for foundations, though properties near the River Wandle might need £3,000-£5,000 extra for specialised drainage. Two-storey projects typically start around £18,000, with costs varying based on your specific ground conditions.
Absolutely - from Haydons Road's industrial conversions to South Wimbledon's residential streets. Regular work takes us through Merton High Street, past Colliers Wood tube station, and into neighbouring Mitcham and Tooting areas.
Standard residential footings take 2-3 weeks including excavation, steel fixing, and concrete curing. Complex projects involving party wall agreements or unexpected ground conditions might extend to 4-5 weeks.
Every foundation carries our decade-long structural warranty, backed by professional indemnity insurance. This covers any settlement issues, concrete defects, or structural movement directly related to our workmanship.
Connecting new foundations to original Victorian footings requires careful assessment and often underpinning work. We'll survey your existing structure, checking depth and condition before designing a solution that prevents differential settlement between old and new sections.
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