Warehouse

A warehouse is a building used primarily for the storage and distribution of goods, with limited staff facilities compared to its footprint. Across Greater London, large warehouses cluster in Park Royal (Brent), Heathrow corridor (Hounslow), Enfield and Barking. Drainage characteristics typically include small WC and welfare facilities serving foul drainage and extensive surface water systems handling rainwater from large flat roofs and yard areas. Common issues include surface water flooding from undersized roof outlets during intense rain, silt blockages on yard gullies, and oil contamination from lorry traffic discharging to surface water drains. Some warehouses storing chemicals or hazardous goods require interceptors on yard drainage under environmental permits. Owners should maintain roof outlets, yard gullies and interceptors, with CCTV surveys advisable when planning extensions or change of use.