CONSTRUCTION & RENOVATION


How offsite M&E is reshaping sustainability in complex residential projects


Laurie Pomeroy, managing director at Resipoint, explores how offsite M&E delivery is helping high-rise residential projects meet growing sustainability demands


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s sustainability targets tighten across the UK construction sector, attention is increasingly turning to how buildings are delivered. While much of the conversation


has historically focused on operational energy, government guidance now emphasises that reducing embodied carbon – the emissions associated with materials and construction – is just as important. Nowhere is this more evident than in the delivery of mechanical and electrical (M&E) services within residential developments. In high-rise, multi-residential projects, the installation of apartment-level services – including heating, ventilation, metering, electrical distribution and telecoms – is often one of the most complex and resource-intensive stages of the build. These systems must be integrated within tight utility cupboard spaces, while remaining compliant, accessible for maintenance, and consistent across hundreds of units. Traditionally, this work has been carried out onsite, with multiple trades operating sequentially within a confined footprint. However, as system complexity increases and programmes tighten, this approach is starting to show its limits – not only from a coordination perspective, but also in terms of material waste and carbon impact. As a result, offsite M&E is emerging as a practical solution to streamline delivery and support more sustainable construction practices.


Cutting waste at the source


One of the most immediate sustainability benefits of offsite M&E delivery is the reduction of material waste.


Onsite installation typically involves cutting, adapting and assembling components within each individual apartment, which can generate a significant amount of waste. Furthermore, variations in workmanship, late-stage design changes, and coordination clashes can all contribute to material inefficiencies and rework. Multiply that across hundreds of apartments and the impact quickly adds up.


By contrast, offsite manufacturing moves this


process into a controlled factory environment, where materials can be handled more efficiently and their use optimised. Prefabrication specialist Resipoint, for example, manufactures fully assembled utility rooms in its Gloucester facility. Through comprehensive 3D modelling and advanced manufacturing techniques such as CNC pipe bending and panel cutting, the company is able to minimise the number of joints, reduce offcuts, and ensure consistent use of materials across every unit. This level of control creates a template for consistent quality that can be repeated at scale while also significantly reducing the volume of waste generated during installation.


Designing out rework early


Rework is one of the most overlooked factors contributing to construction waste and carbon emissions.


In traditional onsite M&E installation,


coordination between multiple trades working in the same confined space can be difficult to manage. Spatial conflicts between systems, access constraints, and sequencing issues often lead to components being removed, adjusted, or reinstalled, sometimes multiple times. Unfortunately, each instance of rework carries an environmental cost, from additional material usage to increased labour hours and costly programme delays.


Offsite construction helps to mitigate this risk by 14 BUILDING SERVICES & ENVIRONMENTAL ENGINEER JULY 2026


identifying installation challenges early, before any physical work begins. Through an iterative preconstruction process,


prefabricated utility rooms are carefully designed and reviewed before manufacture. Once units are built, they undergo multi-stage quality assurance and testing before leaving the factory, significantly reducing the likelihood of defects or changes onsite. The result is a more predictable installation


process, with fewer surprises, fewer interventions, and less waste. A triple win for all parties.


Streamlining site operation


Beyond materials, offsite M&E delivery also has a direct impact on what’s happening on site, and consequently on the energy, transport, and labour that will be needed.


For instance, traditional installation methods


require multiple trades to access the same utility cupboard at different stages of the programme. Dryliners, plumbers, electricians, and ventilation specialists may all need to return to the same space several times, which can create logistical challenges and contribute to higher energy consumption and inefficiencies across the site. Additionally, on a typical high-rise project, the components required to build utility cupboards are delivered in thousands of individual items: boxes, reels, pallets, and loose materials. Each of these must be transported to site, offloaded, stored, moved vertically via hoists, distributed across floors, unpacked within individual apartments, and finally disposed of as waste packaging – a labour-intensive process that also carries a considerable environmental cost. By reducing the number of site visits required and simplifying installation, offsite solutions help streamline operations, lower energy consumption, and improve overall efficiency. On a recent London high-rise project, Fulton & Fifth, a detailed review of the Bill of Materials was used to quantify this impact. Instead of 1473 pallets, 497 reels of cable, 7510 meters of pipes, and 9737 individual boxes of M&E fittings delivered over a 24–36 month period, Resipoint prefabricated utility rooms reduced this to the delivery of 764 complete units, ready to install. This approach eliminated a substantial amount of packaging waste, reduced the number of transport movements to and within the site, and minimised the need for repeated handling and redistribution of materials.


Sustainability at Elephant & Castle Town Centre Another great example of the benefits of this


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approach can be seen at Elephant & Castle Town Centre, one of London’s most ambitious regeneration developments.


Including 485 new homes alongside new space for local services and a new tube station, the project presented a series of complex M&E challenges at the apartment level. Each utility cupboard needed to accommodate a Mechanical Ventilation with Heat Recovery (MVHR) system with integrated cooling, a Heat Interface Unit (HIU), dual water metering, and washing machine services within a highly constrained space.


Additional challenges included shallow cupboard depths, restricted door heights, and the need to maintain easy serviceability. Under these conditions, traditional onsite installation was not a viable option. Working closely with the project team, Resipoint developed a prefabricated utility room strategy that addressed these constraints through careful design and manufacturing precision. This included relocating key components to optimise space, using CNC pipe bending to ensure compact routing, and bespoke structural solutions to coordinate floor build-up and pipework. The result was smooth M&E delivery and a more efficient, less wasteful construction process.


Towards a more sustainable way of building


While offsite construction is not a new concept, its role in supporting sustainability is becoming increasingly important. By reducing material waste, minimising


rework, and streamlining operations onsite, prefabricated M&E solutions offer a practical way to lower the environmental impact of construction without compromising on quality. Offsite M&E is not a silver bullet, but it


represents a meaningful step towards a more controlled, predictable, and resource-efficient construction process: one that aligns both with commercial priorities and environmental goals.


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