Mitcham's clay-rich soil demands foundations built with precision. From Victorian terrace extensions to contemporary garden rooms, proper groundwork transforms ambitions into reality.
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Those charming Edwardian semis dotting Figges Marsh weren't built on guesswork. Neither should your extension be. Concrete foundations in this corner of South London require intimate knowledge of local ground conditions - particularly the London clay that shifts with seasonal moisture. Experience matters when you're digging beneath properties that have stood for over a century.
Strip foundations suit most Mitcham Common properties, though raft solutions prove essential where tree roots from mature oaks have dessicated the substrate. Ground investigation determines depth requirements - typically 1.2m minimum here, deeper near the commons. Steel reinforcement mesh prevents cracking as clay expands and contracts through our unpredictable seasons.
Twenty years excavating beneath Colliers Wood's mix of post-war estates and period homes teaches you which corners hide old wells and where Victorian builders cut corners. Local knowledge saves costly surprises.
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Single-storey extensions generally run £4,000-£8,000 including excavation and concrete. Double-storey projects or challenging ground conditions near the common can reach £12,000-£15,000.
Absolutely - from the conservation areas around Cricket Green to new developments off Western Road. Regular projects across CR4 and into SW16 postcodes.
Weather permitting, excavation through pour takes 8-12 days. Building control inspections add time - Merton Council typically responds within 48 hours.
Structural calculations and installation carry decade-long protection. Insurance-backed warranty covers settlement, heave, and material defects - essential given Mitcham's ground movement history.
Rarely. Most conservatory slabs lack adequate depth or reinforcement for habitable spaces. Underpinning existing structures often costs more than starting fresh with properly engineered foundations.
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