Tender: Sub-Basement Waterproofing Refurbishment and CAT-B Fit Out – Canada House

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The buyer is seeking a contractor to refurbish and waterproof the existing sub-basement areas at Canada House, delivering a fully tanked, dry, and serviceable environment for long-term operational use within a high-security, heritage-listed building. The scope includes careful strip-out to expose the structure; installation of a proprietary cavity drain and damp-proof membrane system to walls and floors connected to existing sump pits; cleaning and re-commissioning of sump pits with new submersible pumps, float sensors, discharge pipework, and a new control panel interfaced with the BMS; application of cementitious or resin-based tanking to identified areas in line with BS 8102:2022; formation of new internal partitions, raised access flooring, ceilings, joinery, and decorations to reinstate the area; and adjustments to affected building services including power, lighting, fire detection, and PAVA systems. Works must be coordinated with the Landlord’s Facilities Management and ongoing operations to ensure secure access, minimal disruption, and compliance with Canada House site protocols, leading to a CAT-B fit out.