Schedule 3 SuDS approval: what is in force and what is not

Schedule 3 to the Flood and Water Management Act 2010 has not been brought into force in England. It has been in force in Wales since January 2019, which is why English developers keep hearing about SuDS approving bodies from colleagues working across the border and wondering what they have missed. As at September 2026 the English position is unchanged: sustainable drainage is secured through the planning system, through conditions and through the lead local flood authority's consultation response, and the automatic right to connect surface water to a public sewer still exists.

What Schedule 3 would introduce

The schedule sets up a separate approval regime for drainage, running alongside planning rather than inside it.

Three features define it. A SuDS approving body sitting within the county or unitary authority, with power to approve or refuse drainage proposals. National standards for the design, construction, operation and maintenance of sustainable drainage. And a change to the right to connect surface water to a public sewer, which becomes conditional on that approval.

Construction with drainage implications could not lawfully begin until the approving body had approved the proposals. The body would also adopt and maintain approved systems serving more than one property, which removes the management company problem that dogs English schemes.

The last of those is the part developers would notice most. Adoption of above ground SuDS in England remains a negotiation, and a statutory adoption route would change the whole calculation on basins, swales and permeable paving.

The approval body model

The approving body sits with the lead local flood authority, which in England is the county or unitary council. That is the same organisation that already comments on drainage for major applications as a statutory consultee.

The difference is the power. A consultee gives advice that the planning authority weighs. An approving body issues a consent that construction cannot proceed without.

In Wales the regime applies to construction work on sites above a stated area threshold or involving one or more dwellings, with national standards published by the Welsh Government and approval required before work starts. Schemes there run two approvals in parallel, and the practical lesson from Welsh practice is that the drainage design has to be developed to a much later stage before work can begin than English practice requires.

How drainage is controlled in the meantime

In England the levers are all planning levers, and they work reasonably well when used properly.

The weak point is the last two rows working together. A condition can require a maintenance plan. It cannot compel anyone to fund that maintenance in perpetuity, which is why so many English schemes end up with a management company and a service charge. That gap is exactly what Schedule 3 was designed to close.

Minor development is the other gap. The lead local flood authority is a statutory consultee for major development, so drainage on small sites depends on the planning authority asking the right questions, and practice varies widely.

Differences between England and Wales

Do not assume a Welsh precedent transfers. The two systems now differ in ways that matter to programme and cost.

In Wales, approval is a separate consent with its own application, fee and determination period, and construction cannot start without it. Design has to be substantially complete before work begins, and changes on site need further approval. Approved systems serving more than one property are adopted by the approving body.

In England, drainage sits inside the planning decision, details are usually reserved by condition, and adoption is negotiated with the sewerage undertaker or handed to a management company. The design can therefore be developed later, which suits developers and produces more disputes at discharge stage.

The technical design is similar in both. The procedure is not.

Planning conditions as the current mechanism

Because conditions carry the whole weight in England, their wording matters more than it would under a statutory regime.

A workable set covers four things: approval of the detailed drainage design before work starts, approval of a verification report confirming what was built before occupation, approval of a maintenance plan naming the responsible body, and a requirement that the system is retained and maintained in accordance with that plan.

The verification report is the one most often left out and the one that most often matters. Without it nobody confirms that the basin was built to the modelled depth or that the flow control installed matches the one in the calculations. The issues a consultee looks for are set out in the note on what a consultee checks in a drainage model output, and the same items reappear at verification.

Maintenance access is the other recurring failure, covered in the note on trash screens, headwalls and maintenance access.

Designing so a change would not break the scheme

The honest position on timing is that nobody can tell you when or whether Schedule 3 will be brought into force in England. Implementation has been consulted on, announced and reconsidered more than once. Treat any stated date as provisional and check the current government position before you rely on it.

What you can do is design so that a change in regime would not require a redesign.

1. Design to the national non-statutory technical standards now, and document the compliance explicitly rather than by implication.
2. Keep SuDS above ground and within public open space where possible, because those are the components an adopting body is most likely to take on.
3. Avoid designs that depend on an unconditional right to connect surface water to the public sewer.
4. Develop the drainage design earlier than an English programme strictly requires, to the level a separate approval would need.
5. Keep a clear record of the maintenance regime, access arrangements and responsible party from the outset.

None of that costs much on a scheme that was going to be designed properly anyway. It costs a great deal on a scheme where the drainage strategy was left as a condition to be solved later.

What to watch before you commit

Two triggers would change the picture: regulations bringing Schedule 3 into force in England, and the publication of national standards with a transitional provision saying which permissions are caught.

Transitional provisions are where the commercial risk sits. A scheme with outline permission and reserved matters still to come is in a different position from one with a full permission and a start on site. Watch for the transitional wording rather than the headline announcement.

Until then, treat sustainable drainage as a planning matter, get the lead local flood authority engaged before submission rather than after, and cross-reference the Flood Risk Assessment so the two documents tell the same story.

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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.