Water supply has become a critical issue for residential and mixed-use development. Capacity constraints, increasing regulatory scrutiny and the growth of alternative water providers mean that water can no longer be treated as a routine technical matter to be resolved late in the process.
Securing a lawful and adoptable water supply typically involves a series of interlinked commercial, technical and legal decisions. If not addressed early, these can have a direct impact on programme certainty, cost and plot sales.
Drawing on our recent experience of acting on water adoption agreements and self-lay arrangements, this article considers how developers are currently securing water supply, focusing on three key areas: working with established water companies and NAVs, securing the rights needed to deliver water infrastructure, and the circumstances in which statutory water requisition becomes the default option.
Established water companies and the rise of NAVs
For many sites, engagement with the regional incumbent water undertaker remains the starting point. Where network capacity exists and off-site reinforcement is limited, this route can provide a relatively predictable outcome.
However, the market has evolved significantly with the growth of new appointments and variations (NAVs). NAVs are site-specific water companies which offer an alternative to the regional incumbent. NAV involvement is commonly paired with self-lay providers who design and install the on-site water infrastructure for the development before it is adopted by the NAV.
From a developer’s perspective, NAVs can offer tangible advantages. They are often willing to engage earlier, may be more flexible on design and can offer commercial terms that align more closely with development delivery.
That flexibility should not be mistaken for a lighter legal touch. Water adoption agreements with NAVs frequently require careful amendment before they are suitable for execution. Issues commonly encountered include incorrect identification of developer and landowner parties, uncertainty around ownership and responsibility for installed water apparatus, charging provisions relating to metering and off-site works, and delivery dates and the consequences of delay.
Corporate change within the NAV sector adds further complexity. Rebranding exercises and changes to instructed solicitors can create uncertainty as to which entity is acting, particularly where an application spans a period of transition. Developers should ensure that instructions, cost positions and completion mechanics remain clear throughout.
Self-lay providers and technical approvals
Self-lay arrangements are now well established in the delivery of water infrastructure. Under these models, a third-party provider installs the water apparatus, which is then adopted by the relevant water company or NAV.
Although the technical approval process can feel less formal than that imposed by some incumbent undertakers, legal due diligence remains critical. Even where a certificate of title is not expressly requested, water adoption agreements will typically include warranties confirming that the developer owns or controls the land, that it is free from adverse third-party rights, and that all necessary rights exist to install, inspect, maintain and replace the water infrastructure.
Self-lay providers themselves are also an important stakeholder. While their drafting input is often limited, they will usually want sight of the final form of the adoption agreement. Their approval can therefore affect timing, particularly where changes are introduced late in the process.
Securing easements and rights: a critical path issue
Whatever delivery route is chosen, if the water infrastructure needs to cross third party land, then the ability to secure a water supply in a timely manner may depend on having the necessary rights over that land to lay, use, access and repair those pipes. Water adoption agreements are therefore only the first legal step in a wider process that may include easements or wayleaves for off-site water mains, together with rights for access, inspection and maintenance.
Delays at the adoption stage can have a disproportionate impact on site-wide delivery programme. In recent schemes, delays to and or worst case the absences of water adoption agreements impact on affordable housing and plot disposals.
This reinforces a recurring theme: securing rights is not an administrative afterthought. It is often the first piece of the puzzle and the item most likely to sit on the critical path.
When statutory water requisition becomes the default
Where agreement cannot be reached, or where off-site constraints make negotiated solutions unviable, developers may consider statutory water requisition under the Water Industry Act 1991. While requisition provides a route to secure a water supply, it is rarely quick or inexpensive.
Although water undertakers have statutory powers to lay apparatus across third-party land, there is often reluctance to deploy those powers in practice. Routes are instead adjusted to remain within highways or land where access already exists, which can significantly increase cost and complexity. Requisition is therefore as much a commercial decision as a legal one, and is often pursued in parallel with continued negotiations to secure private rights by agreement.
Key takeaways for developers
- Engage early: water supply strategy should be addressed alongside other primary infrastructure.
- Do not underestimate documentation: NAV and self-lay arrangements still require careful legal scrutiny.
- Secure rights early: water adoption agreements and easements are frequently the critical path item.
- Treat requisition strategically: it can unlock delivery, but it comes with cost and complexity.
As competition in the water sector continues to evolve, developers who understand the available routes, and the legal implications of each, will be best placed to protect programme certainty and site value.
