Chalk downs and clay patches make Sevenoaks groundworks particularly challenging. Whether you're extending a Victorian villa or sorting drainage on those steep Kemsing slopes, proper foundations matter more here than almost anywhere in Kent.
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Sevenoaks sits on geology that catches many builders off guard. The chalk beneath much of TN14 behaves differently to standard soil, while pockets of heavy clay around Dunton Green create their own headaches. Local knowledge transforms these challenges into straightforward solutions - something we've perfected through hundreds of projects across these postcodes.
Ground investigation comes first, particularly crucial given how water moves through Sevenoaks' varied substrates. Excavation depths depend entirely on what lies beneath - sometimes shallow chalk provides perfect bearing capacity, other times we're digging through fill material left from old quarrying. Modern groundworks here blend traditional techniques with ground source heat pump preparation, soakaway design for sustainable drainage, and foundation systems that handle both shrinkable clay and frost-susceptible chalk.
Fifteen years working these hills means recognising tell-tale signs others miss. That slight slope towards Otford station? It affects your entire drainage strategy. The way established trees influence clay moisture beneath those spacious TN15 gardens shapes our foundation recommendations every time.
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Standard residential groundworks generally range £8,000-£25,000, though chalk excavation can reduce costs while clay stabilisation might increase them. Extensions typically need £12,000-£18,000, drainage solutions start around £5,000.
Absolutely - from the town centre out to rural spots near Kemsing, covering all TN13, TN14 and TN15 postcodes. Regular projects in Otford, Dunton Green, and surrounding villages mean we know every local ground condition.
Most residential foundation projects complete within 2-3 weeks, weather permitting. Chalk areas often progress faster, while properties with access restrictions or complex drainage requirements might need an extra week.
Every groundworks project carries decade-long protection covering structural integrity and drainage performance. Insurance-backed certification provides additional peace of mind, particularly important given Sevenoaks' variable ground conditions.
Hillside properties are our speciality - retaining walls, stepped foundations, and cut-and-fill solutions all form part of regular work here. Those dramatic level changes near the North Downs actually offer creative possibilities when handled correctly.
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