Those Victorian properties around Sevenoaks High Street weren't built on guesswork - they understood proper foundations matter. Whether your shed sits on chalk hillside in Kemsing or clay soil near Dunton Green station, getting the base right transforms a weekend project into something your grandchildren will use.
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Sevenoaks gardens present unique challenges - steep slopes dropping away from those period homes on Granville Road, waterlogged patches where underground springs emerge, tree roots from mature oaks threading beneath everything. A reinforced concrete base solves these puzzles permanently. Local building regulations require specific depths depending on your postcode's soil type, something weekend warriors often discover too late.
Steel mesh reinforcement sits precisely 50mm from the surface, creating tensile strength that resists ground movement. Proper membrane barriers prevent moisture wicking up through capillary action - crucial given how many Otford gardens sit above underground water courses. Edge shuttering gets positioned using laser levels, ensuring rainwater flows away from structures rather than pooling against walls. This technical precision makes the difference between bases lasting fifty years versus five.
Knowledge of Sevenoaks' geology guides every pour - from the ragstone foundations common in TN14 to the clay expanses around Riverhill. Experience tells us where frost pockets form behind Knole Park's boundary walls, which gardens need deeper excavations due to made-up ground from Victorian landscaping.
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Standard 8x6ft shed bases run £450-650 including excavation and materials. Larger garage foundations (5x3m) typically range £1,200-1,800. Sloping sites common around Ide Hill add roughly 20% due to additional levelling work.
Absolutely - from Shoreham's narrow lanes to new developments off the A25. Regular jobs take us through TN13 (central Sevenoaks), TN14 (Halstead, Knockholt), and TN15 (Otford, Kemsing). Even reached Toys Hill last month despite those challenging access roads.
Excavation and pouring happens in one day for standard sizes. Curing requires 48 hours minimum before light loads, though full strength develops over 28 days. Weather permitting, most Sevenoaks projects run Monday excavation, Tuesday pour, Friday handover.
Each base carries decade-long protection against structural failure - that's ten years of confidence your greenhouse won't sink or your workshop crack. Documentation includes depth measurements, reinforcement specifications, and photographic evidence of membrane installation.
Tree removal sites need special attention - remaining roots decay creating voids, while disturbed soil settles unpredictably. Extra excavation removes organic matter, then Type 1 aggregate creates stable sub-base. Many Sevenoaks gardens have mature trees, so we handle this scenario regularly.
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