Those narrow Balham gardens between Victorian terraces need solid foundations that won't shift. Getting concrete bases right in SW12's clay soil takes local knowledge and proper groundwork.
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Balham's mix of period properties and modern conversions creates unique challenges for outdoor structures. Whether you're adding a workshop behind your Edwardian semi or need a base for bike storage in a compact courtyard, the foundation determines everything. Clay soil movement, tree roots from mature plane trees, and drainage issues common to SW12 all affect how concrete performs over time.
Proper excavation depth varies dramatically across Balham - some areas hit London clay at 300mm, others need 600mm before reaching stable ground. Reinforcement mesh prevents cracking when neighbouring extensions cause ground movement. Type 1 MOT substrate compacted in layers creates the drainage that stops pooling water undermining your base. Each pour gets calculated precisely for load requirements.
Twenty years working between Wandsworth Common and Streatham Hill means knowing which gardens flood in winter storms. Local builders trust our bases because they've seen them outlast the structures built on them.
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Garden office bases (3m x 4m) generally run £800-£1,200 in Balham. Smaller shed foundations start around £400, while double garage bases can reach £2,500 depending on access and ground conditions.
Every road from Nightingale Lane to Balham Park Road falls within our regular working area. SW12 properties from the Heaver Estate to Wandsworth Common get same-day quotes.
Most residential bases in Balham complete within 2-3 days including excavation. Curing time adds another 48 hours before you can build.
Each base carries decade-long protection against settlement or structural failure. Documentation includes mix specifications, reinforcement details and photographic progress records.
Victorian terraces throughout SW12 often have 900mm passages - we use compact mixers and wheelbarrow concrete where needed. Even properties backing onto the railway cutting get proper bases installed.
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