Those Victorian terraces around Mitcham Common deserve foundations that match their century-old stability. Whether you're planning a garage extension or need a base for that long-awaited garden room, getting the concrete right matters more than most homeowners realise.
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Mitcham's mix of clay soil and London's unpredictable weather creates particular challenges for any groundwork project. Properties from Figges Marsh to the edges of Colliers Wood often sit on ground that shifts with the seasons. A properly engineered concrete base prevents future headaches - cracked walls, uneven floors, doors that won't close properly. Local experience counts when you're dealing with the specific ground conditions found between the Common and Lower Mitcham.
Modern concrete technology has moved far beyond the basic sand-cement-aggregate mix your grandfather might have used. Today's reinforced bases incorporate steel mesh or rebar grids, waterproof membranes, and precise aggregate ratios calculated for load distribution. Thickness varies from 100mm for lighter structures up to 200mm for substantial buildings. Proper curing takes patience - rushing this stage leads to weakness that shows up years later.
Twenty-three years working across South London teaches you which corners matter and which specifications actually make a difference. Every base gets treated like it's supporting our own family's building.
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Standard shed bases (3m x 2.4m) generally run £800-£1,200, while larger garage foundations (5m x 3m) range from £2,000-£3,500. Site access and ground conditions around your specific CR4 or SW16 property affect final costs.
Absolutely - from the conservation areas near Cricket Green through to the newer developments towards Phipps Bridge. Both CR4 and SW16 postcodes fall within our regular working area.
Smaller bases typically need 2-3 days including excavation and pouring, with walking access after 48 hours. Larger projects might stretch to 5-7 days, especially if we hit unexpected ground issues.
Each base carries decade-long coverage against structural failure. This includes protection against cracking, subsidence, and water penetration - documented with photos and specifications kept on file.
Sometimes existing hardcore can be reused as sub-base material after proper assessment. Old concrete needs breaking out completely - partial removal creates weak points where new meets old.
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