A » In the context of new build projects in Leeds, the requirement for a licensed water utility contractor is not merely a matter of best practice but is, in most instances, a legal and regulatory necessity. The United Kingdom’s water supply and drainage infrastructure is governed by stringent regulations, principally the Water Supply (Water Fittings) Regulations 1999, which are enforced by local water undertakers. In Leeds, the statutory water supplier is Yorkshire Water, and any new connection to the public mains supply or significant alteration to the internal plumbing system must comply with these regulations. For new build projects, the process typically involves two distinct phases: the off-site connections (such as a new service pipe from the main) and the on-site internal plumbing. The off-site connection work—excavating, laying pipes to the public main, and installing a meter—is almost exclusively carried out by the water company itself or by a contractor that holds a formal self-lay accreditation, such as the National Water Hygiene Scheme or the Water Industry Registration Scheme (WIRS). While it is possible for a developer to use a self-lay provider (an independent contractor approved by the water company), this contractor must be licensed and accredited to work on the public water network. Without such licensing, the work cannot legally proceed, as it would be an unauthorised interference with the public supply. Regarding the internal plumbing within the building, the regulations do not require the installer to hold a specific water utility licence per se, but they do mandate that anyone carrying out the work must be competent and that the installation must prevent contamination, waste, and misuse. This is often demonstrated by employing a contractor registered with an Approved Contractors' Scheme, such as the Water Industry Approved Plumber’s Scheme (WIAPS) operated by the Water Regulations Advisory Scheme (WRAS) or similar bodies. While not strictly a “licence,” certification from such a scheme is effectively a professional authorisation to work on water fittings. Furthermore, building control approval under the Building Regulations 2010 (Part G for sanitation and Part H for drainage) also applies. Practically speaking, for a new build in Leeds, a developer would engage a contractor that is either directly employed by Yorkshire Water for the connection or a licensed self-lay organisation for the main-to-meter section. For the internal works, a contractor with WRAS approval or equivalent qualification is strongly advised—and often required by project insurers or warranty providers. Failure to use appropriately licensed or accredited contractors can lead to enforcement action by Yorkshire Water, potential disconnection, fines, and significant delays (e.g., if the water supply is refused or a connection agreement is rescinded). Additionally, unlicensed work may invalidate building warranties and cause issues with mortgage lenders. Therefore, while there is no single universal “water utility contractor licence” covering every aspect, the reality is that a new build project in Leeds must involve licensed and accredited professionals at each stage to ensure legal compliance, safety, and successful connection to the public water supply. Engaging a contractor without proper authorisation is inadvisable and potentially costly.