MULTI-OCCUPANCY PLUMBING & HEATING
How to approach plumbing and heating specification in multi-occupancy buildings
With the growing trend towards multi- occupancy buildings, David Corner, product support manager at John Guest, explores how effective plumbing specification delivers performance and efficiency
V
isit almost any city in the UK, and you’ll see the rapid growth of multi-occupancy buildings, including high-rise apartment blocks through to purpose-built student
accommodation. These buildings are reshaping not only skylines, but also the demands placed on building services, where higher occupancy, shared infrastructure and system interdependence require a more considered approach to plumbing and heating design. In multi-occupancy buildings, plumbing and heating systems are not only essential for occupant comfort, but also for safety, compliance and wider sustainability goals. Delivering on all these fronts requires more than straightforward product specification. Instead, specifiers must adopt a whole-building approach to specification, beginning in the plant room, rising through distribution networks and culminating in individual dwellings.
Strong foundations are built in the plant room
The plant room is the operational centre of any multi-occupancy plumbing and heating system, housing essential equipment such as boilers, expansion vessels and water treatment. This space is the beating heart of the infrastructure that allows the complete building to operate efficiently and reliably. As the point where mains water supply typically enters the building system, where it can fluctuate significantly, the plant room must be equipped to safely manage water pressure from the outset. Specifiers must ensure the correct solutions are in place to manage this pressure and ensure sufficient supply around the whole building. Here, Pressure Reducing Valves are key, offering vital protection for critical equipment by managing excess pressure at the point of entry. Large-scale systems, which are essential for multi-occupancy buildings, create further complexities in areas such as thermal expansion. As water is heated, it expands, requiring appropriate control measures to prevent
overpressure and long-term stress on the system. Expansion Vessels regulate these pressure fluctuations, ultimately protecting pipework and valves within the system. When designing plant rooms, specifiers also need to consider backflow prevention. The larger the system, the greater the potential for contamination, making the inclusion of reduced pressure zone valves essential within the plant room. These safeguard the mains supply from contamination by preventing water from flowing back into the public network.
Just as important as the initial specification, the plant room must be designed with long- term serviceability in mind. To support reliable
functionality, these valves need to be routinely maintained, so ensuring they’re accessible will support ongoing performance and compliance.
Vertical distribution: designing risers for reliability and control
From a well-designed plant room, utilities must travel efficiently throughout the building to individual apartments. Risers play a critical role here, ensuring water and heating reach each dwelling reliably. In modern buildings, however, space is at a
premium, so risers must remain compact, all while delivering dependable performance. Effective sizing and configuration are therefore key and rely on a comprehensive understanding of anticipated demand. Specifiers must consider the number of dwellings, occupancy patterns and even the volume of outlets across kitchens, bathrooms and utility areas – all of which will help to determine the flow rates required. To deliver this while keeping space to a minimum, compact solutions are increasingly important. Combination valves, such as the John Guest Reliance Tenant Valve Compact, bring multiple functions into a single unit – engineered to reduce potential leak points, speed up and simplify installations, and save space. As with the plant room, serviceability remains critical within the risers. The ability to isolate services on each level supports maintenance without disrupting services across the building.
Delivering performance for every dwelling
It would be easy to focus solely on this stage when specifying plumbing and heating for multi-occupancy buildings, but well-planned plant rooms and risers strengthen and simplify specification at this level. Occupants expect stable pressure, reliable hot water and safe systems. Specifiers must ensure this is achievable, without compromising performance across other dwellings, even when demand across the building is high. The installation of single and double check valves helps safeguard against contamination within individual homes, maintaining system integrity.
18 BUILDING SERVICES & ENVIRONMENTAL ENGINEER OCTOBER 2026 Read the latest at:
www.bsee.co.uk
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