One year into the marine nitrates crisis, Hayley Eastment explores how we can balance the vital protection of our natural environment with the equally urgent need to provide safe, affordable homes
It has been a year since Natural Resources Wales (NRW) published its updated conditions assessments and planning advice relating to marine Special Areas of Conservation (SACs) across west Wales. What followed was one of the most significant planning shocks to hit housing delivery in Wales in recent years.
NRW’s advice effectively halted the development of thousands of urgently needed social homes across large parts of west Wales, impacting housing associations, local authorities, developers, supply chains and communities already experiencing acute housing pressures.
A year later, despite considerable work by Welsh Government, local authorities and wider stakeholders, thousands of homes remain stalled, including affordable homes. Against the backdrop of a housing emergency, the question facing Wales is increasingly stark: how do we balance the vital protection of our natural environment with the equally urgent need to provide safe, affordable homes?
What happened?
The issue emerged following updated evidence and conservation advice published by NRW for several marine SACs, including Pembrokeshire, Carmarthen Bay and Estuaries, and Cardigan Bay. NRW concluded that elevated levels of Dissolved Inorganic Nitrogen (DIN) were contributing to unfavourable environmental conditions in these protected sites. Under the Habitats Regulations, local planning authorities are required to ensure that development does not adversely affect the integrity of these protected areas.
In practical terms, the result was immediate uncertainty across affected local authority areas. New housing developments, and in some cases schemes already progressing through planning or construction, were suddenly required to demonstrate nutrient neutrality or provide mitigation to offset their impact before planning permission could be granted or lawfully implemented.
The impact has been profound. As many as 11,000 homes across west Wales have been reported as affected by the advice. For housing associations alone, more than 2,000 affordable homes are currently impacted, and 70 ready-to-go affordable homes risk standing empty this summer if the situation remains unchanged.
This is happening against the backdrop of record pressure on housing need. More than 10,500 people in Wales are currently living in temporary accommodation, including more than 2,000 children, with local authorities facing rising costs and increasing difficulty securing suitable placements. At a time when tens of thousands of people across Wales remain on waiting lists for social housing, it is deeply concerning that affordable homes which could help relieve this pressure are unable to progress. Wales has declared a housing emergency, yet in parts of west Wales the delivery of affordable homes has effectively stopped.
Protecting nature and delivering homes
Housing associations across Wales are deeply committed to protecting and restoring the natural environment. The sector recognises the importance of safeguarding protected habitats and improving biodiversity outcomes for future generations, and many organisations are already going beyond minimum requirements in areas such as energy efficiency, placemaking, biodiversity enhancement and sustainable drainage. The sector fully accepts the need for robust environmental protections.
But there is a growing tension between environmental ambitions and housing delivery. NRW’s own reports indicate that nutrient pollution is driven predominantly by agriculture, alongside contributions from private sewage systems and pressures within the water industry, with agriculture responsible for around 95% of nutrient loads in many catchments. Yet housing development has become one of the most immediate and visible sectors impacted by the planning response. There remains frustration that while housing delivery has slowed dramatically, equivalent visible progress in addressing the largest contributor to nutrient pollution has not followed. This imbalance risks creating a perception that housing delivery is carrying a disproportionate burden for a much broader environmental challenge.
The impact on the wider economy
The impact is now extending far beyond delayed housing schemes alone. Across west Wales, prolonged restrictions are beginning to affect the wider development and construction ecosystem that affordable housing delivery depends upon. Local consultants and contractors are already reporting significant reductions in workload linked directly to the continued planning moratorium in affected areas.
One west Wales architectural practice reported that revenues in the first half of the financial year were down by almost a third compared with pre-restriction levels, following an earlier 20% annual reduction in turnover linked to the slowdown in planning activity. The practice had already been forced to make redundancies as a direct result of halted development activity. Nick Cox, commercial director at RLH Architectural Ltd, said this was “a desperate situation we are all in”, warning that without urgent intervention “jobs will be lost, businesses will close and the building of these much-needed homes will cease”.
Many businesses are now actively seeking work outside affected counties in order to remain viable, while competing against a growing number of firms doing the same. This risks creating a longer-term weakening of local development capacity and supply chains within rural west Wales, precisely at the point when significant housing delivery is needed. Rebuilding lost confidence, expertise and supply chain capacity in rural areas would take significant time, even once solutions are implemented.
The sector is already facing rising construction costs, economic uncertainty and pressure on capacity; the sudden removal of a substantial pipeline of development has created major instability. There are also growing concerns that prolonged disruption to development pipelines could begin to place additional pressure on contractors operating in Wales more broadly. Recent experiences across the construction industry have demonstrated how quickly financial pressures can escalate once workloads reduce and confidence weakens. This is not simply a housing issue. It is an economic issue, a community issue and a workforce issue.
We have seen this before
In January 2021, NRW published evidence showing that a significant proportion of SAC rivers in Wales were failing tighter phosphorus targets. This led to nutrient neutrality requirements being applied across several river catchments, with major impacts on housing delivery in areas including the Wye, Usk, Teifi and Cleddau catchments. Housing developments stalled, LDPs were delayed, planning applications paused, and affordable housing schemes placed at risk. Welsh Government established working groups, river summits and support programmes aimed at unblocking development and identifying mitigation approaches. Significant effort was invested across the sector to understand wastewater treatment capacity, nutrient pathways and potential offsetting mechanisms.
And yet, here we are again, only a few years later, this time with marine nitrates. The recent crisis has left the sector questioning whether it learned enough from the phosphates experience. It raises questions whether early warning systems, clearer regulatory coordination, and faster strategic solutions can be delivered before the current crisis deepens.
There is also frustration that Wales continues to respond reactively to environmental compliance issues after planning systems and housing pipelines have already been severely disrupted, rather than taking a more proactive national approach to environmental capacity, infrastructure investment and catchment management. Without learning from previous experience, there is a real risk that nutrient neutrality becomes an ongoing cycle of uncertainty, delay and stalled housing delivery across different parts of Wales.
The rural challenge
The impact is particularly acute in rural communities, where bringing forward affordable housing is already difficult due to land availability, viability pressures, infrastructure constraints and complex planning requirements. Many communities across west Wales are already facing affordability pressures, ageing populations and the loss of younger people unable to remain in the areas where they grew up. Housing associations play a vital role in sustaining these communities by delivering homes for local people, families and key workers.
The marine nitrates issue compounds these existing challenges and risks making affected areas less attractive for future development investment altogether. There is also growing concern that, with further environmental assessments taking place elsewhere in Wales, similar restrictions could emerge in additional parts of the country. Without a clear long-term national strategy, there is a real risk that these challenges become more widespread and the supply chains that have sustained investment in rural Wales begin to look elsewhere.
The impact on Local Development Plans
The implications extend beyond individual planning applications and stalled housing sites. Marine nitrates are beginning to have significant consequences for LDPs, which are intended to provide certainty about where homes, jobs and infrastructure should be delivered over the coming years. Planning authorities are increasingly having to revisit evidence bases, Habitats Regulations Assessments and site allocations, placing further pressure on already under-resourced planning teams.
This creates major challenges for housing associations attempting to plan long-term development pipelines and investment programmes. The experience mirrors the phosphate crisis, which disrupted LDP progression across multiple parts of Wales. Where uncertainty remains around wastewater treatment capacity, mitigation measures or environmental impacts, authorities may struggle to confidently allocate sites for future housing growth. The result risks delaying plan-making, weakening housing land supply and reducing confidence for future investment, particularly in rural areas where viable development opportunities are already limited.
At a time when Wales has declared a housing emergency and is seeking to accelerate social housing delivery, prolonged uncertainty within the planning system risks achieving the opposite.
Welsh Government’s response
The last Welsh Government moved quickly to establish the Marine Nitrates Development Taskforce, bringing together officials, NRW, local planning authorities and Dŵr Cymru Welsh Water to develop practical solutions to unblock development while remaining compliant with environmental legislation. Progress over the past year includes the development of a Nutrient Calculator and the establishment of a Nutrient Credit Trading Group, which in time will allow developers to offset nutrient impacts through investment in wetland creation, woodland planting and wider environmental improvements. However, many of these solutions are heavily dependent on the availability of suitable land for mitigation, which is itself a finite and increasingly constrained resource, particularly in rural areas where development opportunities are already limited.
Welsh Government also commissioned guidance and case studies to support planning authorities in progressing LDPs and determining planning applications in affected areas. Alongside this, Carmarthenshire County Council led the development of a mitigation handbook for developers. This is a welcome initiative demonstrating strong commitment from local authorities to support delivery wherever possible. However, for many housing associations and developers, the handbook has raised further questions and does not yet provide a clear route map for schemes already on site or nearing completion.
Some authorities are exploring whether affordable housing occupied by existing catchment residents generates any genuinely additional environmental impact – a potentially important route for certain schemes, given that these households already contribute to local nutrient loads. But considerable uncertainty remains around ongoing wastewater treatment capacity assessments by NRW and Dŵr Cymru Welsh Water, and how these will affect development going forward.
What happens next?
A year on, the sector is still searching for practical pathways to unlock delivery. Many pipeline schemes remain on hold pending a clear solution, and the longer that situation persists, the harder it becomes to support local supply chains, investor confidence and development momentum. The Marine Nitrates Development Taskforce dissolved at the end of the last Senedd term, yet many of the issues it was established to address remain unresolved. There is understandable concern across the housing sector about how this work will continue under the new Welsh Government, and whether the pace and urgency required will be maintained.
The reality is stark. Large projects remain stalled. Affordable homes that communities urgently need are delayed. Physically completed homes may stand empty in the middle of a declared housing emergency. The challenge facing Wales is not a choice between protecting nature and delivering homes, we must do both. Environmental restoration is essential. So too is providing secure, affordable housing for the thousands of people currently waiting for a home.
The solutions will require long-term collaboration across government, regulators, the water industry, agriculture, planning authorities and the housing sector. They also require urgency, because while systems, guidance and governance structures continue to evolve, families across Wales remain without the homes they desperately need.
Hayley Eastment is Policy and External Affairs Manager at Community Housing Cymru