Solid ground beneath every Sevenoaks property starts with properly engineered footings. Whether you're extending that Victorian semi or planning a garden room overlooking the North Downs, the right foundation makes all the difference.
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Those chalky slopes around Kemsing and the clay pockets near Dunton Green present unique challenges for foundation work. Local knowledge matters when calculating load requirements for Sevenoaks' varied terrain. From strip foundations for traditional brick extensions to reinforced rafts for contemporary garden studios, each project demands careful assessment of ground conditions specific to your plot.
Modern foundation design goes beyond simply digging trenches and pouring concrete. Ground movement sensors, thermal bridging calculations, and radon protection all factor into today's specifications. Particularly around Otford where the greensand meets clay, engineered solutions prevent seasonal movement that can plague inadequately designed bases. Steel reinforcement placement, concrete mix ratios, and membrane positioning require precision – shortcuts here cost thousands later.
Twenty years working Sevenoaks soil teaches you which areas need extra depth, where water tables fluctuate most. Every foundation carries our structural engineer's certification, backed by comprehensive insurance specific to Kent ground conditions.
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Strip foundations for a single-storey extension typically range £3,000-£5,000, while engineered raft foundations for larger projects start around £8,000. Clay conditions common to parts of Sevenoaks may require piled solutions from £12,000.
Absolutely – from the conservation areas of TN13 through to the newer developments in TN14 and rural properties across TN15. Regular projects in Otford, Dunton Green and Kemsing mean we understand each area's specific ground challenges.
Standard strip foundations typically take 5-7 working days including excavation and curing time. Complex raft or piled solutions may extend to 2-3 weeks, particularly during wet periods when Kent clay becomes challenging.
Each foundation includes decade-long structural coverage, annual settlement monitoring for the first two years, and certification that satisfies building control throughout Sevenoaks District. Documentation includes all calculations and material specifications for your records.
Connecting new foundations to existing structures requires careful assessment and often underpinning work. We'll survey your current foundations, check depths against modern standards, and design compatible solutions that prevent differential settlement between old and new sections.
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