Housing Delays Go Down the Drain: How Wastewater Woes are Stalling New Homes in England.

By Matt Crisp – Director

England’s housing plans are hitting an unexpected blockage: the sewers. Across the country, local authorities have paused thousands of new homes because wastewater infrastructure isn’t keeping up.  

Research by the Home Builders Federation (HBF) has revealed that almost 30,000 planned new homes (including around 7,000 affordable homes) are stuck in limbo due to wastewater capacity. This backlog is feeding into the wider housing crisis, as developments remain stuck on paper instead of being built. Planning permissions have been delayed or refused by councils citing inadequate sewer infrastructure, even where the local water company did not object to the development. Alongside the homes, an estimated £900m in contributions for schools, roads and parks is also on hold. 

Take Norfolk, where Anglian Water has warned its infrastructure can’t cope with new homes in nearly 20 coastal towns and villages, promoting West Norfolk Council to consider blocking developments until upgrades are complete, some not expected until 2035. In Oxford, Thames Water’s delays to sewage treatment upgrades have stalled 18,000 new homes, with developers branding the city ‘un-investable’ until at least 2027. Meanwhile, in East Sussex, Southern Water gave assurances it could handle new homes in Hailsham, but Wealden Council still refused permission, citing a lack of trust after repeated flooding incidents. 

At the heart of the issue is a planning and infrastructure system out of sync. National policy makes water companies legally responsible for ensuring adequate sewer network capacity for developments. Developers already pay substantial fees, more than £2.3bn since 2020, to help fund upgrades. Many also install assets like pumping stations and new pipes, later handed over to water companies. 

Yet many local authorities appear to be losing confidence that infrastructure will be delivered on time. High-profile sewage pollution incidents and strain on ageing networks have put water companies under intense public scrutiny. Local authorities are cautious to sign off new housing if they believe there is a real risk of wastewater networks and water treatment plants unable to accommodate them, leading to a ‘better safe than sorry’ stance. The risks of proceeding without firm infrastructure guarantees are too high – they could face community backlash or environmental damage if things go wrong. For their part, water companies flag risks and request conditions to avoid being blamed later, while operating under Ofwat’s funding cycles and environmental permits that limit how quickly upgrades can happen.  

Developers, meanwhile, are frustrated. They have met their obligations, but projects remain stuck. The HBF has warned that “misalignment between planning authorities, utility companies and national policy is stalling off housing supply.” In short, each party insists it is doing the right thing, but the system as a whole is gridlocked.    

At Cavendish, we believe that better communication and collaboration can bridge the gap between development ambitions and infrastructure realities. Our planning communications team specialises in bringing together developers, stakeholders and communities to find common ground and keep critical projects moving. Whether it’s facilitating stakeholder workshops, crafting clear public messaging on infrastructure plans, or navigating the planning process, we’re here to help.