Water (Self Lay & NAV)

As the leading self-lay provider in our operational areas, we offer our customers a true choice between self-lay and the OFWAT new appointments and variations (NAV) solutions.

Designing, installing, and connecting self-lay water in-house allows us to streamline the complex processes developers face in trying to manage plot connections in-house.

Our NAV solution provides increased consistency, control and most importantly, additional savings from the host option, which can reverse the recent cashflow pressures caused by the change in charging approach.

You can rely on our knowledge and skills when it comes to water networks and connections. We’re active participants in water market forums and have a strong voice in regulatory consultations and discussions.

When it comes to asset adoption, one of our executives sits as a member of the water code adoption panel, coordinated by Water UK under the guidance of the water regulator.

  • Choice of self-lay or NAV water solutions
  • Highly experienced design and delivery teams
  • WIRS (Water Industry Registration Scheme) registered and actively engaged in water network policy bodies
Speak With Our Team

Project planning support

Our feasibility studies will help you at the early planning stages of your project and avoid unnecessary future costs.

Reduced costs

Our multi-utility approach creates cost efficiencies in the network design and delivery process.

In house design

Our extensive design experience will create optimised network design solutions.

In house delivery

Our operations team ensure your connections are on time every time.


Absolutely we are the largest independent self lay provider where we design install and connect water mains and connections on behalf of the local host water company and we also offer a fully independent service where we pass the installed mains to another asset owner under the new appointment and variation (NAV) process – its your choice.

Independent networks comply with the same stringent standards as the host and are regulated by OFWAT in exactly the same way. Price controls are built into each site license and prevent charging more than the local host for water for ever.

Our dedicated operations manager will work with your site team throughout the project to make sure we know your programme intimately, we then ensure that all of the required stages are complete to make sure that your final connections are on time. With NAV networks 100% of the process is within our control which speeds things up even more.


Since TriConnex has been delivering self-lay, we get our water installed when we need it, fully coordinated with the other services. They have finally broken the hold that the traditional water companies had over delivery of our developments.

Construction Director – Bellway Thames Gateway

Contact our team

For all enquiries or further information regarding our services,
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