Flood risk assessment · London Borough of Hammersmith and Fulham
Flood risk assessment in Hammersmith and Fulham, from £375 fixed
Over 60% of Hammersmith and Fulham is in Flood Zones 2 and 3, and the council asks for a flood risk assessment there, in its surface water hotspots, and for basements where groundwater is high. It rejects assessments that look only at the Thames, so we cover breach, sewer and groundwater risk too.
or email hello@fixedfeeplans.co.uk
No obligation. Nothing is sent until you ask; your enquiry comes to us and nowhere else.
Photo: David Anstiss / Wikimedia Commons, CC BY-SA 2.0
Fixed fee, in writing
Tell us about your project
Send the postcode and what you want to build, and add photos or old plans if you have them. We reply with the fee in writing and the payment stages set out in full.
What Hammersmith and Fulham Council asks of a flood risk assessment
From the council's Planning Guidance SPD, chapter 15, key principles FR1 to FR3 (guidance on Local Plan Policy CC3) (adopted February 2018).
- The SPD says that over 60% of the borough's area and about 75% of its population are in the Environment Agency's Flood Zones 2 and 3, behind defences built to a 1 in 1000 year standard that could still be over-topped or breached. (source, checked 29 October 2026)
- Key principle FR1 asks for a site-specific flood risk assessment for all proposals in Flood Zones 2 and 3, for new development in surface water flooding hotspots in the Surface Water Management Plan, and for new development with a subterranean element where the plan shows elevated groundwater. (source, checked 29 October 2026)
- Flood risk assessments that consider the Thames but not other sources such as surface water, groundwater and sewers, or that leave out a breach of the defences, will be rejected as inadequate. (source, checked 29 October 2026)
- For a house extension that would not significantly increase flood risk, the SPD says a less detailed assessment would generally be acceptable. (source, checked 29 October 2026)
- The council has applied the sequential test and concluded that all parts of the borough are potentially suitable for development, so flood risk assessments there need not include one. (source, checked 29 October 2026)
What Hammersmith and Fulham flood risk assessment drawings have to show
In Hammersmith and Fulham the Thames is only one of the sources we check. The council's own Surface Water Management Plan hotspots, its groundwater map and the sewer flooding records come first for most houses, because the SPD says an assessment that looks at the river alone will be rejected.
Where the house sits behind the defences, the assessment also covers a breach and says how the occupants stay safe if one happens. For an ordinary extension we keep it proportionate, as the SPD allows, and mark the floor level and resilience measures on the drawings.
Hammersmith and Fulham: 506 householder decisions
What it costs in Hammersmith and Fulham
- Flood risk assessment: from £375.
Flood risk assessment across London · Hammersmith and Fulham planning rules · every price
Flood risk assessment · Hammersmith and Fulham
What happens next in Hammersmith and Fulham
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
Hammersmith and Fulham flood risk assessment questions
Do I need a flood risk assessment for an extension in Hammersmith and Fulham?
Why do Hammersmith and Fulham flood risk assessments get rejected?
Does Hammersmith and Fulham need a sequential test?
Start with £150
Your fixed fee is already on this page.
Tell us the postcode and what you want to build. We confirm the fee in writing and book the survey.