Hertfordshire is one of the busiest development counties in the East of England, and every new housing scheme, commercial site, and infrastructure project needs a water supply before anything else can happen. For decades, the only route was to wait for the regional water company to install the mains and services. Self-lay changed that. Under the self-lay model, an accredited provider installs the new water mains and service connections independently, and the water company adopts the assets once the work is signed off.
The catch is that not anyone can do it. Self-lay providers (SLPs) must be accredited under the Water Industry Registration Scheme (WIRS), administered by LRQA, before a water company will allow them to work on infrastructure that will join the public network. In Hertfordshire, where Affinity Water is the principal statutory undertaker, developers choosing the self-lay route need a WIRS-accredited provider who can coordinate with Affinity’s developer services process from application through to adoption.
These are the providers worth knowing about.
McFadden Utilities
McFadden Utilities is a family-run water utility and civil engineering contractor based in Welwyn Garden City, right in the heart of Affinity Water’s supply area. Established in the early 1980s, the business has been delivering water infrastructure across Hertfordshire and the surrounding counties for over 40 years.
McFadden operates as a WIRS accredited self-lay provider, covering both onsite and offsite self-lay works. The company delivers an end to end service for developers, taking schemes from excavation and pipe laying through testing, chlorination, and commissioning, with the completed mains handed over to the water company for adoption. Because McFadden also carries out reinstatement, tarmac and road surfacing in house, developers can appoint one contractor for the water infrastructure and the making good, rather than coordinating separate firms.
The accreditation stack runs deeper than WIRS alone. McFadden holds ISO 9001, ISO 14001, and ISO 45001 certification, Constructionline Gold membership, and Achilles UVDB Audited status, and the firm works within the supply chains of Tier 1 contractors including Balfour Beatty and Skanska.
Cascade Water Services
Cascade Water Services is a Hertfordshire-based water supply specialist with more than 30 years of experience. The company is accredited under WIRS through LRQA and is authorised to carry out new water service connections, self-lay installations, and supply pipe replacements up to and including 63mm. Cascade serves Hertfordshire, Bedfordshire, and London, and is a strong option for smaller connection packages and supply pipe work.
Cascadia Water
Cascadia Water is an accredited self-lay provider based in Ruislip, specialising in new water main installation and self-lay connections for new-build properties and commercial developments. The company works across London and the Home Counties, installing new mains to industry standards before handover to the local water company.
M&S Water Services
M&S Water Services is a self-lay provider based in Luton, operating across the Affinity Water and Anglian Water regions that cover Hertfordshire and the surrounding counties. The firm offers a complete self-lay package, from assisting with the water company application through to commissioning the new main and making the final service connections.
What to look for in a self-lay provider
Whichever provider you shortlist, check the following before appointing:
- WIRS accreditation and scope. Every legitimate SLP appears on the WIRS register maintained by LRQA. Check the provider is currently accredited and what their accreditation actually covers, since scopes differ between firms.
- Water company coordination. In most of Hertfordshire, the new mains will be adopted by Affinity Water, so the provider needs a working relationship with Affinity’s developer services team and a track record of clean adoptions.
- Breadth of delivery. Some providers only handle the pipework. Others carry out the reinstatement, surfacing, and highway works as well, which can simplify the programme and reduce the number of contractors on site.
- Track record and accreditations beyond WIRS. ISO certification, Constructionline, and Achilles membership all indicate a contractor that larger clients have already vetted.
Self-lay exists to give developers choice, speed, and cost control. With the right WIRS-accredited provider, the water infrastructure stops being the item that holds the programme up.
