Barhale, Galliford Try, Glanua, Kier, Mott MacDonald Bentley, Tilbury Douglas, and Ward & Burke will deliver on the utility’s increased investment in non-infrastructure clean and wastewater assets over the next five years.

This framework forms part of Yorkshire Water’s AMP8 investment programme, its largest-ever environmental initiative, which has been approved by regulator Ofwat at £8.3bn.

The firms will provide a mix of civil engineering, mechanical, electrical, instrumentation, control and automation and building capability.

Rachael Fox, head of programme delivery at Yorkshire Water, said: “We’re looking forward to working with our chosen partners as we embark on an ambitious investment programme from 2025.

“There’s a big challenge ahead – not only to meet new regulatory requirements, but to meet customer expectations too – and effective collaboration will be key to our success.”

Mark Wood, Regional Director (Yorkshire) at Barhale, said: “There is a very large and exciting plan for the next five years and beyond.

“The programme will continue Yorkshire Water’s focus on value, innovation and improved environmental performance. It will build on the legacy established in AMP7 of delivering large-scale improvements to existing infrastructure alongside groundbreaking projects – such as Clifton Wetlands where we were proud to play our part in the creation of a sustainable and low-carbon, nature-based solution that replaced a conventional wastewater treatment facility.

“The long contract term will allow Barhale to continue to grow as a business and to invest in our team. Our graduate programme will have a strong base to build on and as we move into the full design and build sector for civil and mechanical and electrical projects and provides us with the opportunity to become a full multi-disciplinary principle contractor construction business.”

Andy Lingham, managing director for Kier’s water business, added: “This appointment builds on the strong, collaborative relationship we’ve developed with Yorkshire Water over the past five years since the start of AMP7.

“This continued partnership reflects the trust we’ve built and our shared commitment to delivering resilient and sustainable water infrastructure.”