Those chalk hills around Sevenoaks present unique challenges when laying foundations. Whether you're extending a Victorian terrace in Dunton Green or building a garden room overlooking the Darent Valley, getting the groundwork right matters.
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Foundation work in this corner of Kent demands local knowledge. The mix of clay deposits near Kemsing and chalky terrain towards Otford means every project needs careful ground assessment. Many properties here sit on sloping plots with mature trees - factors that significantly influence foundation design. Years of working across TN13, TN14 and TN15 postcodes have taught us exactly how deep to dig when dealing with Sevenoaks' varied geology.
Modern foundation techniques have evolved beyond simple strip footings. Reinforced concrete rafts distribute loads evenly on problem soils, while mini-pile systems handle those tricky spots near established oak trees. Ground beams link everything together, creating a stable platform that won't shift when clay shrinks in summer. Each pour gets vibrated thoroughly to eliminate air pockets - crucial for long-term stability.
Local structural engineers regularly recommend our groundwork across Sevenoaks. They know we document every stage properly, from initial excavation through to final levels.
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Strip foundations for a single-storey extension usually range from £4,000-£7,000. Raft foundations for larger projects start around £8,000, while specialist piled solutions begin at £12,000. Site access and ground conditions heavily influence final costs.
Absolutely - our crews work daily across TN13, TN14 and TN15. Recent projects include extensions in Otford, new builds near Dunton Green station, and garden office bases throughout Kemsing village.
Standard strip foundations usually complete within 5-7 working days including excavation and curing time. Complex raft systems need 2-3 weeks, particularly on sloping sites common around the North Downs.
Every foundation carries our decade-long structural guarantee. This covers settlement issues, concrete degradation, and waterproofing failures - backed by proper insurance and annual inspection options.
Definitely. Many Edwardian and Victorian homes in Sevenoaks have shallow foundations by modern standards. We carefully underpin existing footings where needed, ensuring new sections integrate properly without causing differential movement.
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