Welcome to Pro Drainage Group, the United Kingdom’s prime specialists in domestic and commercial sewage treatment plants. We’re proud to be renowned as the country’s foremost authority in installing, repairing, and maintaining all kinds of sewage treatment plants.
When planning a new development in the UK, one of the most important but often overlooked considerations is how waste water will be managed. Whether the project is a single self build home or a larger residential development, drainage and sewage treatment are fundamental to gaining planning approval and meeting legal obligations.
A common question asked by developers and homeowners alike is whether a sewage treatment plant is mandatory for new developments. The answer depends on a range of factors, including location, access to mains drainage and environmental considerations. Understanding the regulatory framework early can prevent costly delays and compliance issues later.
This article explains when sewage treatment plants are required, what alternatives may be acceptable, and how UK regulations shape decision making for new builds.
Contact usAll new developments must demonstrate that waste water can be disposed of safely and legally. Local planning authorities and the Environment Agency are primarily concerned with protecting public health, watercourses and the wider environment.
Waste water from a property includes everything that leaves kitchens, bathrooms and utility areas. This water must be treated to an acceptable standard before being discharged or allowed to soak into the ground. Poorly designed systems can contaminate groundwater, rivers and coastal waters, which is why regulations are strictly enforced.
For developments connected to mains drainage, waste water is treated off site at a central water treatment plant. Where mains drainage is not available, on site treatment solutions must be considered.
Learn MoreSewage treatment plants are not automatically mandatory for all new developments, but they are often required where there is no feasible connection to mains drainage.
Planning authorities generally apply a hierarchy of drainage options. Developers are expected to consider these in order and justify their choice.
The preferred option is connection to the public sewer. If this is not possible or not practical, alternative systems are assessed. These alternatives may include a sewage treatment plant or, in limited cases, a septic tank.
In practice, sewage treatment plants are increasingly favoured for new developments, particularly in rural and semi rural areas. This is because they offer a higher level of treatment and greater environmental protection than older systems.
Get in Touch TodayPlanning permission plays a crucial role in determining whether a sewage treatment plant is required. As part of the application process, developers must provide details of how waste water will be managed.
Local planning authorities will typically require evidence that mains drainage is unavailable before approving an off mains solution. This often involves correspondence with the local water authority confirming that connection is not viable.
Where a sewage treatment plant is proposed, planners will assess its location, discharge method and potential environmental impact. This is especially relevant in sensitive areas such as the South Coast and Dorset, where groundwater protection and coastal ecosystems are key concerns.
Book in TodayOne of the most frequent mistakes is leaving drainage design until late in the planning process. This can result in delays or costly redesigns.
Another common issue is underestimating space requirements. Sewage treatment plants, soakaways and access zones require sufficient land, which must be factored into site layouts from the outset.
Using inexperienced installers is also a risk. Incorrect installation can invalidate warranties and lead to non compliance with Building Regulations or Environment Agency guidance.
Call our TeamNo, they are not mandatory in every case. However, where mains drainage is unavailable, a sewage treatment plant is often the preferred and sometimes the only acceptable solution.
Septic tanks are rarely approved for new developments. They are generally only permitted in exceptional circumstances and must discharge to ground rather than surface water.
Yes, sewage treatment systems are normally assessed as part of the planning application for a new development.
Request a Quote TodayWhile sewage treatment plants are not universally mandatory for new developments, they are increasingly the standard solution where mains drainage is unavailable. Their ability to treat waste water effectively and protect the environment makes them a reliable choice for modern developments.
Understanding planning requirements, Building Regulations and Environment Agency guidance from the outset allows developers and homeowners to make informed decisions. Seeking expert advice early can simplify the process and ensure long term compliance.
For those planning new developments, professional guidance on sewage treatment systems, water treatment plant options and soakaway installation can provide clarity and confidence at every stage.
Book a Visit