Schedule 3 SuDS approval and where it stands

Schedule 3 to the Flood and Water Management Act 2010 would create a SuDS approving body, a separate consent for drainage works, and a duty to adopt sustainable drainage serving more than one property. It would also remove the automatic right to connect surface water to a public sewer unless the drainage system has been approved. In England it has never been brought into force. In Wales it has been in force since January 2019, which is why Welsh schemes run through a process English developers do not recognise.

The position described here is as at September 2026, and commencement is a live question that has been announced, reviewed and deferred more than once. Check the current commencement position before you plan a programme around it.

What Schedule 3 would introduce

Three mechanisms, and they work together.

An approval requirement. Construction work with drainage implications could not start until the drainage system had been approved by the SuDS approving body, which would sit within the unitary or county authority rather than the district. Approval would be against national standards for the design, construction, operation and maintenance of sustainable drainage.

An adoption duty. The approving body would be required to adopt drainage systems it has approved where they serve more than one property, taking on their maintenance in perpetuity, with a bond or other security covering the construction period.

A change to the right to connect. The automatic right to connect surface water drainage to a public sewer under the water industry legislation would become conditional on the drainage system having been approved. That is the provision with the sharpest commercial effect, because the right to connect is currently something a developer can rely on.

The approving body role in practice

Where the schedule is in force, the approving body is a technical consenting authority. It reviews drainage design against standards, inspects during construction, and signs off before adoption. It is not the planning authority, and its decision is separate from planning permission.

For a developer the consequences are procedural rather than technical. Another consent in the programme. Another set of drawings at a different level of detail. Another inspection regime with hold points. And another body whose timescales you do not control.

The design itself does not change much, which is the useful thing to understand. A drainage strategy built to current national standards and the industry SuDS manual is broadly the design a SuDS approving body would expect. What changes is when it has to be finalised and who signs it off.

How it would interact with planning permission

The overlap is obvious and it is the reason the schedule has been contentious. Drainage is already controlled through planning for major development, through the lead local flood authority as statutory consultee, and through building control under the drainage approved document. A fourth control needs to displace part of what the others do, or it simply adds time.

The current England arrangement and how it arose

Rather than bringing Schedule 3 into force, the government made sustainable drainage a planning matter through a written ministerial statement, effective from April 2015. That statement expects sustainable drainage in major development unless demonstrated to be inappropriate, and lead local flood authorities became statutory consultees on surface water drainage for major applications.

So in England the control is exercised through a planning condition and a consultee response, with maintenance secured by a planning obligation or a private management arrangement. It works, in the sense that drainage gets designed and conditioned. Its weakness is adoption: many systems end up with a management company, and the long-term maintenance of a feature that nobody inspects is the gap Schedule 3 was meant to close.

The weight a written ministerial statement carries is a question in its own right, which we look at in written ministerial statements and the weight they carry.

The position in Wales, for comparison

Schedule 3 was brought into force in Wales in January 2019. Construction work above a small area threshold, and any scheme involving one or more houses, needs approval from the local authority acting as SuDS approving body, against Welsh statutory standards for sustainable drainage.

Two observations that English developers hear from colleagues working there. Approval timescales are real and need programming, and the level of design detail required at approval stage is higher than an English planning condition usually demands. Second, adoption has changed behaviour: designers specify features that can actually be maintained, because somebody is going to have to maintain them and will say no to a design that cannot be.

Devolved drainage rules differ from the English position throughout, and a Welsh scheme needs its national policy checked by the reviewer rather than assumed from English practice.

Designing now for either outcome

The sensible approach is to build a drainage design that would survive commencement without a redesign.

1. Design to the current national standards for sustainable drainage and to the industry manual, and record which edition you used.
2. Treat surface water quality as a separate demonstration from attenuation, with the comparison set out rather than implied.
3. Take the design to construction-level detail earlier than a planning condition strictly requires, particularly for a scheme that will be built in phases over several years.
4. Settle adoption early. Decide which features go to the sewerage undertaker under an adoption agreement, which go to a management company, and which stay with individual plot owners, and put it on a plan.
5. Specify features that can be maintained by whoever will own them, with access, and price the maintenance rather than leaving it as an unfunded obligation.
6. Keep the right to connect in mind. Where a scheme depends on a surface water connection, get the undertaker's position in writing early, because that is the provision most likely to change.

All of this belongs in the Drainage Strategy submitted with the application, cross-referenced to the Flood Risk Assessment rather than repeated in it.

What to watch for

Commencement of Schedule 3, if it happens, will come with transitional provisions, and those provisions will decide whether your consented scheme falls inside or outside the new regime. Watch for the commencement regulations rather than the announcement, because announcements have been made before without commencement following.

Watch also for national standards in a statutory form, since the current English standards are non-statutory, and for any change to the adoption arrangements in the sewerage sector, which affects the same question from a different direction.

One honest uncertainty: there is no reliable way to predict the commencement date, and a developer who redesigns a scheme in anticipation may be doing it years early. Design well, keep the design capable of approval, and follow the planning law timeline for changes rather than acting on a press notice.

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This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.