25 Cannon Street

A central element of MPH’s package was the installation and connection of GRP water storage and variable-speed booster equipment. The mTT strategy placed the principal potable storage and boosting infrastructure at basement level, with distribution rising through the service cores to meet building demand.

MPH coordinated tank, pump and distribution connections within the plantroom, considering isolation, access, valve locations and interfaces with the rising mains. This work formed the starting point for the domestic cold water system serving the refurbished office floors and welfare areas.

The boosted water network was specified in copper, with pipework distributed through vertical risers and branched into toilet cores, showers and future tenant connection points. The design required controlled supply pressures and accessible isolation throughout the building.

MPH installed domestic cold water pipework and connections across the refurbished service zones, integrating the new system with the architectural layout and other mechanical installations. Its work linked the central plantroom infrastructure to the final points of use.

The hot water scheme brought together local unvented electric heaters within the toilet cores and centralised unvented electric storage serving basement shower and changing facilities. The different arrangements had to be integrated with a common domestic cold water supply.

MPH installed the local and centralised hot water equipment and associated water pipework, safety and discharge connections. Distribution, valve access, heaters and sanitary outlets were coordinated within plantrooms and smaller on-floor service spaces.

MPH delivered the above-ground soil and waste drainage package, comprising cast-iron Timesaver main stacks and PVC-U/MUPVC branch connections serving the sanitary areas. The system was designed to operate by gravity, with stack ventilation and drainage continuing to high-level basement collection routes.

The installation required careful setting out around revised cores and retained structure, with attention to gradients, supports, access for rodding and connections at the base of vertical runs. Cast-iron jointing and coordinated service routes were central to the delivery.

The reconfigured architectural scheme required new cast-iron rainwater stacks and adaptations where existing rainwater runs met revised roof outlets and service-core locations. The specified rainwater system collected by gravity before connecting at high level in the basement.

MPH installed the rainwater drainage stacks and associated branch and transition connections, fitting the routes around the building’s existing structure and surrounding services while preserving inspection and maintenance access.

MPH’s work extended to sanitaryware second-fix installations and the associated final water and waste connections. WCs, washbasins and shower areas required accurate alignment of the finished appliances with the installed hot and cold water and drainage infrastructure.

This stage involved close coordination with completed finishes and access requirements, ensuring the final fittings and connections were integrated into the refurbished spaces.

The project linked several public health disciplines through the same service cores: water storage, booster distribution, hot water generation, gravity drainage and sanitaryware. Each relied on compatible pipework routes and careful sequencing with the wider construction works.

For MPH, 25 Cannon Street demonstrates delivery of an integrated public health package within a major City of London refurbishment, where plantroom knowledge, riser coordination and detailed installation workmanship are equally important.