COVER STORY
Twelve months, 306 homes: how Polypipe’s Off-site Prefabrication Service kept the Bowback House project on track
When a 14-storey building has to go from groundworks to occupancy within a year, the build programme sets the rules. This feature highlights how Polypipe Building Services designed and fabricated a water supply and drainage system to support a rapid schedule at Bowback House in Milton Keynes.
A fast build with no room for delay.
Bowback House is a build-to-rent development on the site of a former office block in Milton Keynes city centre. Delivering 306 new homes across 14 floors, including 43 affordable apartments; the project was designed for speed, with prefabricated bathroom pods and utility cupboards built into the plan from the outset. The compressed timeline presented a challenge to the mechanical and electrical (M&E) contractor. Grove Mechanical, working on behalf of HG Construction, needed a partner that was unfazed by new ways of working or tight deadlines. Polypipe Building Services was the ideal fit.
Its Advantage Off-site Prefabrication Service specialises in the design, manufacture and supply of complete water management systems, and is capable of delivering system components on demand - in step with a demanding site schedule. The Advantage Team’s designers can work alongside the contractor’s team, developing the system as the building rises. Meanwhile MecFlow Fusion, one of Polypipe’s water supply systems, uses innovative and rapid jointing techniques that enable the installers to keep pace.
Designing the network as the building went up.
Bowback House’s bathrooms and riser cupboards were prefabricated, but such was the speed of the build that the connecting pipework had to be developed and installed as the project progressed. This was the challenge for Polypipe Building Services: design, fabricate and supply the pipework on a rolling basis. It meant drawings arrived at the start of each installation phase, and components were delivered in step with the site schedule. At Bowback, each floor’s prefabricated utility cupboard connects to a 125mm MecFlow Fusion riser. MecFlow Fusion is the Polypipe water supply system specifically designed for riser, plantroom, header and runout installations. The prefabricated elements are jointed in the factory using specialist welding tools and then installed on-site with Electrofusion couplings – which require no torches, open flames and hot works licenses. The supply is fed from the plantroom via the riser up to each floor where it is split by manifolds into the various outlets. At Bowback House, these manifolds had to be custom-made to
fit the prefabricated utility cupboards and accommodate the valve and metering systems the client had specified. Polypipe’s Advantage Off-site Prefabrication Service produced them to order, arriving on site ready to connect. MecFlow Fusion was used for the whole system
from the plant room and boosted cold water system to the risers and manifold cupboards. Polypipe’s Terrain PVC Soil & Waste was used for the above-ground drainage system.
Close collaboration and deep understanding.
Polypipe’s designers and Grove Mechanical’s engineers worked closely throughout the project. Chris McMullan, Operations Director at Grove Mechanical, said: “MecFlow Fusion’s rapid jointing techniques and the responsiveness of Polypipe’s designers meant we not only had a supply system that was designed to fit perfectly with the prefabricated bathroom pods and utility cupboards; we were also able to develop and fabricate the network that connected them in real time. Polypipe kept the whole project on the move.” Jason Duncan, Regional Sales Director at Polypipe Building Services, also highlighted the project’s collaborative aspect. He said: “Our designers and Grove Mechanical’s engineers are really on the same wavelength. The Advantage Team really enjoy working with Grove.”
What it means for the next fast- track project.
With the government striving to meet new housing targets and investors looking for a quick return, embracing the benefits of innovations in off-site construction will be crucial to achieving rapid on-site gains without compromising quality.
Jason Duncan continued: “The concept of designing, prefabricating and installing water supply and drainage systems ‘on-the-fly’ would have been considered far-fetched a few years ago,” he said. “Today it’s understood that it’s the only way the industry is going to deliver on its targets.
“The combination of MecFlow Fusion’s jointing system and our prefabrication capability means
10 BUILDING SERVICES & ENVIRONMENTAL ENGINEER NOVEMBER 2026
that we can help install teams hit new levels of speed and effectiveness.”
For contractors facing similar programmes, three lessons stand out from the Bowback House project: • Engage a manufacturer with end-to-end capability. Work with a partner who can compress the design, fabrication and installation process.
• Prefabricate the awkward parts. Complex components such as custom manifolds are better built under controlled factory conditions than on a busy site.
• Protect your skilled people. Faster jointing and off-site fabrication free up installers for the work that needs their expertise.
At Bowback House, the result was a water supply and drainage system that matched the pace of the build, with just 12 months elapsing from breaking ground to the first residents moving in - and without compromising the quality and reliability a development of this kind expects. For contractors whose biggest challenge is the pace of the programme, Polypipe Building Services can help from first drawing to final connection.
For more information visit:
polypipebuildingservices.com/advantage, email
buildingservices.technical@
polypipe.com or call 01622 795200.
Read the latest at:
www.bsee.co.uk
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