A corner of yellow-brick Victorian terraced houses with red brick arches over the windows on Pearman Street in Lambeth, a white van and bare trees
Floor plan drawings, pencil sketches of a house, a scale rule and a protractor spread across a desk
Photo: Tima Miroshnichenko / Pexels

Flood risk assessment · London Borough of Lambeth

Flood risk assessment in Lambeth, from £375 fixed

Lambeth's local list asks for a flood risk assessment with every proposal in Flood Zones 2 and 3, and in Flood Zone 1 wherever its own flood studies show surface water, groundwater or sewer flooding. Surface water risk can also bring a sequential test, so we check your address on both maps first.

Flood risk assessmentfrom £375
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A red clad outbuilding with a white window standing in brown floodwater among bare trees
Flood-resistant materials are specified to a height above the estimated flood level. Photo: Serge Lavoie / Pexels.

What Lambeth Council asks of a flood risk assessment

From the council's Local Information Requirements (the Local List) 2024, item 34, under Local Plan Policy EN5 (adopted 2024 edition, published December 2025, read 29 October 2026).

  • A site-specific flood risk assessment must be submitted with all development proposals in Flood Zones 2, 3a and 3b, as a requirement of Policy EN5 of the Lambeth Local Plan 2021. (source, checked 29 October 2026)
  • In Flood Zone 1, one is needed for residential sites over 0.5 hectare or with 10 or more homes, sites under 1 hectare with a critical drainage problem, and other proposals with evidence of risk from surface run-off, groundwater or sewer flooding in the Lambeth SFRA or Local Flood Risk Management Strategy. (source, checked 29 October 2026)
  • Sequential testing is required for sites at high or medium risk of surface water flooding on the Environment Agency's maps, and for developments in Flood Zones 2, 3a and 3b, in line with Annex 5 of the Local Plan. (source, checked 29 October 2026)
  • The assessment should show how flood risk will be managed over the development's lifetime, with an allowance for climate change and regard to the vulnerability of its users. (source, checked 29 October 2026)

What Lambeth flood risk assessment drawings have to show

In Lambeth the question is often not the Thames at all but surface water, groundwater or sewer flooding recorded in the council's own flood studies, which can bring an assessment in Flood Zone 1. We check the flood zone and those studies for your address before we write a word.

The assessment then gives the flood level with climate change, the finished floor level and the measures for the extension, and it flags early where surface water risk means the council will expect a sequential test.

PS2 · at a glance

Lambeth: 595 householder decisions

Lambeth
Approvals, prior approvals included83.4%

496 of 595 granted. London: 85.8%.

Decided within 8 weeks94.1%

333 of 354 applications, prior approvals excluded.

Source: MHCLG PS2, 1 July 2025 to 30 June 2026. Dark tick: London.
Two hands holding a printed floor plan over a desk of drawings, with a pen and notebook beside it
Checking the drawings with you before anything goes to the council. Photo: Tima Miroshnichenko / Pexels.

What it costs in Lambeth

  • Flood risk assessment: from £375.

Flood risk assessment across London · Lambeth planning rules · every price

Flood risk assessment · Lambeth

What happens next in Lambeth

We check your address on every map the council uses, take the flood level with climate change, set the floor level and resilience measures, and mark them on the drawings.

Photo: Helena Jankovičová Kováčová / Pexels

Answers

Lambeth flood risk assessment questions

When does Lambeth require a flood risk assessment?
For all development in Flood Zones 2, 3a and 3b, and in Flood Zone 1 for larger sites, sites with a critical drainage problem, and proposals with evidence of surface run-off, groundwater or sewer flooding in the Lambeth Strategic Flood Risk Assessment or Local Flood Risk Management Strategy. It is a requirement of Local Plan Policy EN5.
Will Lambeth ask for a sequential test on my extension?
The local list says sequential testing is required for sites at high or medium risk of surface water flooding on the Environment Agency's maps, and for developments in Flood Zones 2 and 3, in line with Annex 5 of the Local Plan. National guidance exempts minor development such as householder extensions; we confirm which applies.

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02
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£175
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£225
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Total, planning application£795
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