Infrastructure Minister Liz Kimmins has announced a voluntary scheme allowing property developers to contribute directly towards upgrading Northern Ireland’s overstretched wastewater network, aiming to unblock thousands of homes currently stalled by infrastructure constraints. The initiative, confirmed on 19 March 2026, will enable developers to fund specific capacity upgrades in exchange for new connections, though participation remains entirely optional.
The decision follows a 14-week public consultation that attracted nearly 300 responses, and represents the third element of the Minister’s “three-pronged approach” to tackling capacity issues. Since autumn 2024, an extra £30 million in capital funding has already unlocked connections for 5,300 additional properties—outstripping initial projections—but industry data suggests approximately 15,000 to 19,000 homes across the North remain in limbo awaiting sewerage investment.
Minister’s Three-Pronged Strategy
Announcing the voluntary pathway, Minister Kimmins emphasised the fundamental importance of wastewater infrastructure to public health and economic growth. She said:
“Access to reliable and effective wastewater infrastructure is fundamental to our public health, environmental protection and economic prosperity. However, years of underinvestment have left our system under considerable strain, creating a significant obstacle to progressing ambitions for housing and business growth.
The Minister outlined her broader strategy, stating:
“My three-pronged approach – securing more investment for wastewater infrastructure from Executive colleagues, introducing the Water, Flooding and Sustainable Drainage Bill, and on progressing voluntary developer contributions – underlines my commitment to delivering innovative solutions in partnership with NI Water.”
How the Voluntary Scheme Will Work
The scheme allows developers to pay for upgrades or replacements of NI Water’s infrastructure in areas where capacity constraints currently prevent new connections. Crucially, the Minister stressed that no developer will be forced to participate.
“This new voluntary pathway will give developers, who wish to do so, the opportunity to directly contribute to the costs of upgrading or replacing NI Water’s wastewater infrastructure in areas where existing capacity is preventing new connections. No developer will be required to contribute if they do not wish – the choice will be entirely theirs.”
Minister Kimmins described the policy as offering a “double opportunity”:
“Not only will it offer a route for developers to progress much-needed projects, especially new homes, but it will also create potential for prospective homeowners and tenants to access a greater supply of housing in areas currently held back by wastewater limitations.”
From Consultation to Policy
The Department for Infrastructure launched the public consultation on 21 March 2025, seeking views on whether and how developer contributions should be introduced. The consultation closed on 27 June 2025 and generated almost 300 responses, which have now informed the decision to proceed initially with a voluntary model.
A summary report of the consultation responses has been published alongside the announcement. The Department has confirmed it will continue to explore the potential for a compulsory levy, with any future decisions to be informed by the outcomes and experiences of the voluntary arrangements.
Critical Gaps in the Detail
While the voluntary scheme offers a new pathway for stalled developments, significant questions remain unanswered. The Department has not specified contribution rates, eligibility thresholds, or when the scheme will formally open for applications. Without these details, developers cannot yet assess whether participating represents value for money compared to delaying projects.
The voluntary nature of the scheme also raises concerns about geographic equity. Developers may choose to fund upgrades only in high-value areas where profit margins justify the additional cost, potentially leaving socially necessary but economically marginal housing schemes in limbo. This risk is particularly acute given that the Executive’s Housing Supply Strategy commits to delivering 100,000 homes over 15 years, including substantial numbers of social and affordable properties.
Furthermore, the Minister acknowledges that developer contributions alone will not solve the funding crisis. NI Water faces a cumulative capital funding gap estimated at over £2 billion for the 2027-2033 period, according to analysis by the Northern Ireland Fiscal Council and industry bodies. The £30 million allocated since autumn 2024, while unlocking 5,300 properties, represents a fraction of the investment required to address the 68 wastewater treatment works currently at capacity and the 107 networks with restricted flow.
Questions for Stakeholders
- How will the Department prevent a “postcode lottery” where only developments in affluent areas attract voluntary contributions, while socially necessary housing in less profitable locations remains blocked?
- What specific uptake levels or timeline will trigger the introduction of the compulsory levy, and will this require fresh legislation?
- Will contribution costs be passed directly to homebuyers, potentially inflating house prices in an already strained market?
- How will the voluntary scheme interact with the Water, Sustainable Drainage and Flood Management Bill currently progressing through the Assembly?
- Can the Department guarantee that contributions will be ring-fenced for specific local upgrades rather than absorbed into general NI Water budgets?
What Happens Next
The success of the voluntary scheme will likely determine whether the Department moves to compulsory contributions before the next Assembly election in 2027. In the meantime, the Water, Sustainable Drainage and Flood Management Bill—currently at Committee Stage following its Second Stage passage in September 2025—will provide the legislative framework for sustainable drainage systems that could reduce pressure on the sewerage network.
Minister Kimmins has committed to working with Executive colleagues to secure further capital investment for NI Water, but with competing demands on the Draft Budget 2025-26, significant additional public funding appears unlikely. The Department will need to demonstrate quickly that the voluntary scheme can unlock meaningful housing numbers, or risk facing pressure to accelerate the compulsory levy before the current mandate ends.