We are seeing the updated National SuDS Standards become a much more important issue in planning applications, particularly where LLFAs are reviewing Drainage Strategies for major development.
The key point is this:
An LLFA objection should not really be framed as “the scheme does not comply with the SuDS Standards” in isolation.
The stronger planning point is:
Because the Drainage Strategy does not properly address the SuDS Standards, the LPA cannot be satisfied that the proposal complies with the NPPF, PPG and local plan policy.
The current NPPF requires development to avoid increasing flood risk elsewhere and expects SuDS to be incorporated unless clearly inappropriate. For major development, SuDS should take account of LLFA advice, have appropriate minimum operational standards, and include lifetime maintenance arrangements. The PPG then points applicants towards technical standards and expects a SuDS strategy to explain things like:
the drainage hierarchy
proposed discharge rates and volumes
climate change allowances
multifunctional SuDS benefits
integration with green infrastructure
exceedance routing
maintenance and adoption arrangements
The new National SuDS Standards are therefore becoming the technical benchmark for whether a Drainage Strategy is good enough.They are not an absolute pass/fail code. Departures may be justified where site constraints mean full compliance is not possible. But those departures need to be evidenced, explained, and agreed, not left for the LLFA to infer. The direction of travel is also clear. The NPPF consultation proposes a dedicated SuDS policy, F8, which would expressly require SuDS to be designed in accordance with the National Standards.
So, for live applications, the practical advice is simple:
Do not treat the SuDS Standards as a late-stage technical issue. Build them into the Drainage Strategy from the outset and make the compliance position clear.