With the UK Government pushing ahead with its ambition to deliver 1.5 million new homes over the course of this Parliament, equating to 300,000 per year, attention is turning to how and where these homes can be built.
While the focus remains on a ‘brownfield-first’ approach, there is growing discussion around the introduction of so-called grey belt land - areas within the Green Belt that are underused or of limited environmental value - in a bid to boost housing delivery. Together, these initiatives form part of a wider reimagining of planning and land use policy designed to get the country building again.
However, developing previously used or lower-quality land brings its own set of challenges, not least when it comes to ensuring that new homes have a safe and reliable water supply.
James Roper, Head of Product Portfolio at Aliaxis UK, explains why barrier pipe systems, such as GPS Protecta-Line, are helping housebuilders navigate these issues efficiently and compliantly.
The challenge of brownfield and grey belt land
Brownfield sites are often central to regeneration plans and can help reduce pressure on greenfield areas. The Government’s ongoing investment, including almost £2bn to unlock more than 1,500 hectares of brownfield land, demonstrates how vital these areas are to meeting housing targets.
At the same time, the conversation around grey belt land signals a shift in the planning landscape. By reclassifying underused parts of the Green Belt that offer limited community or environmental benefit, the Government aims to balance the need for new homes with the preservation of genuinely valuable green spaces.
However, both brownfield and grey belt sites can bring hidden complexities for developers. Brownfield land in particular often contains contaminants such as hydrocarbons, solvents, or heavy metals from previous industrial use. These substances can remain in the ground for decades and pose a serious risk if they permeate traditional water pipes, potentially compromising drinking water quality.
Overcoming contamination risks
While remediation work can help to address some contamination issues, it can be expensive, time-consuming, and may not always guarantee complete removal of pollutants. A more efficient approach is to use a barrier pipe system that is designed specifically to prevent contaminants from migrating through the pipe wall and into the water supply.
Guidance from UK Water Industry Research (UKWIR) sets out which pipe materials are suitable for use on contaminated land. Standard single-layer polyethylene pipes do not offer sufficient resistance, whereas materials such as wrapped ductile iron, wrapped steel, copper, or aluminium-lined polyethylene (ALPE) provide proven protection.
The UKWIR project steering group has confirmed that a PE-Al-PE barrier pipe provides sufficient protection for all brownfield sites, eliminating the need for costly soil sampling and analysis in many cases. This makes barrier systems both practical and cost-effective for developers navigating complex planning and environmental conditions.
A proven and trusted solution: Protecta-Line
Protecta-Line is our barrier pipework solution. It is a tough, multi-layer system approved to BS8588 and WRAS approved. It has been utilised by water companies and housebuilders for more than 25 years to deliver a clean and safe water supply to homes built on contaminated land or any site that may have a future contamination concern.
Protecta-Line offers a complete and fully approved barrier system, individually kitemarked as a complete barrier system. Further development has also seen the introduction of the Protecta-Line barrier boundary box. Designed to house the water meter at the boundary between the water main and the domestic supply, which can provide a shield against all known contaminants.
By removing the need for extensive soil sampling and simplifying installation, Protecta-Line helps projects stay on budget and on schedule, while safeguarding the long-term quality of drinking water for residents.
As the Government’s planning reforms and land-use strategy evolve, systems like Protecta-Line will continue to play a critical role in ensuring the safe, sustainable growth of new housing across both brownfield and emerging grey belt land.