The long-awaited 2026 National SuDS Standards are set to reshape how surface water is managed across the UK. Introduced alongside Schedule 3 of the Flood and Water Management Act 2010, these standards will make Sustainable Drainage Systems (SuDS) a mandatory part of most new developments.

For developers, architects, and homeowners, this means a greater focus on designing drainage that manages rainfall on-site - using systems such as ponds, swales, rain gardens, and permeable paving - to replicate natural water processes and protect local infrastructure.

Key Changes in the 2026 SuDS Standards

1. Runoff control: Strict limits will be introduced on how much rainwater can be discharged from new developments, ensuring that surface water runoff is slowed and controlled.

2. Mandatory approval: Before any construction can begin, drainage plans will need approval from a SuDS Approval Body (SAB) to confirm compliance with national standards.

3. Green infrastructure: Developments will need to incorporate natural drainage features - like green roofs, swales, and rain gardens - to improve biodiversity, water quality, and public amenity.

4. Maintenance and adoption: Every SuDS scheme will require a long-term maintenance plan, ensuring systems perform effectively for years to come.

Regional Impacts

Across East Anglia, London, and Manchester, the new standards will influence how developments are planned and delivered.

• In East Anglia, where flood risk is already high, new housing schemes will likely feature larger attenuation ponds and swales to manage excess rainfall.

• In London, space constraints mean solutions like green roofs, rainwater harvesting, and permeable paving will become increasingly common.

• In Manchester, developers may look to combine underground attenuation with landscaped features to cope with heavier rain events.

Early consideration of SuDS design will be crucial to streamline approvals and future-proof developments against both flooding and regulatory change.

How JMS Engineers Can Help

At JMS Engineers, we specialise in helping clients meet these evolving requirements with practical, compliant drainage solutions. Our services include:

• SuDS Reports and Drainage Strategies - fully compliant designs ready for SAB approval.

• Pre-application advice - helping you understand and plan for 2026 SuDS requirements.

• Hydraulic modelling and calculations - to demonstrate that runoff and water quality targets are achieved.

• Maintenance and adoption planning - ensuring your systems perform for the long term.

The 2026 National SuDS Standards mark a major shift in how developments handle surface water. Planning ahead now will help you stay compliant, protect your investment, and build more resilient, sustainable communities.

Get in touch with JMS Engineers to discuss how we can help prepare your next project for the upcoming SuDS regulations.

JMS Engineers are award-winning Consulting Structural & Civil Engineers with over 25 years experience in providing engineering solutions across residential, commercial and industrial projects.