Flood Risk Assessments & Drainage Strategies in London
Independent flood risk consultants serving London and surrounding areas. Planning-ready FRAs and SuDS drainage strategies from £295, delivered within 3–5 working days.
Flood Risk Assessments in London
Flood Risk Environmental provides Flood Risk Assessments, SuDS drainage strategies and detailed drainage design for planning applications across all 33 London boroughs and surrounding areas.
London has significant tidal flood risk from the Thames, substantial surface water flooding in many inner-city boroughs, and complex drainage requirements. The Thames Barrier protects central London from tidal flooding, but residual risk behind defences must still be addressed in FRAs. Surface water flooding affects many boroughs including Lewisham, Croydon and Southwark.
Our reports are prepared by a qualified consultant with over 17 years' experience and written specifically to satisfy the requirements of your London Borough and the Thames Regional Flood and Coastal Committee as the Lead Local Flood Authority.
Services in London
- Flood Risk Assessments — from £295
- SuDS drainage strategies for planning
- Detailed SuDS and drainage design
- LLFA SuDS proforma completion (London Boroughs)
- Sequential and Exception Test submissions
- S23 Ordinary Watercourse Consent
- EA Flood Risk Activity Permit applications
- LLFA drainage objection responses
When Do You Need a Flood Risk Assessment in London?
Planning applications in London require a Flood Risk Assessment in the following circumstances:
Development in Flood Zone 2 or 3
Any development in London's Flood Zone 2 or 3 areas requires an FRA. The LLFA will object to applications in flood risk areas without a robust FRA and drainage strategy.
Major Applications (10+ dwellings)
Major planning applications in London — 10 or more dwellings, sites over 0.5ha, or non-residential floorspace over 1,000m² — require an FRA in any flood zone.
Sites Over 1 Hectare in FZ1
Large sites in Flood Zone 1 may require an FRA if over 1 hectare, to demonstrate that drainage is adequate and runoff won't increase downstream flood risk.
LLFA Drainage Conditions
Where a London Borough has imposed a pre-commencement drainage condition, we prepare the detailed SuDS design package needed to satisfy the condition and secure approval.
LLFA Drainage Objections
If your London planning application has received a flood risk or drainage objection from the LLFA, we can review it and prepare a technical response to resolve it fast.
Change of Use
Converting commercial buildings to residential use in a flood risk area in London typically requires a new Flood Risk Assessment to confirm future occupiers will be safe.
Frequently Asked Questions
Trusted by Developers, Architects & Planning Consultants
“Antony was great to work with when we needed a Flood Risk Assessment and Emergency Flood Plan. As an architect I would definitely use FRE Consultants again — professional and produced reports within a good time frame.”
“The service received was great and at a competitive cost. We were granted planning after first submission.”
“Fast, technically thorough and understood exactly what the LLFA needed. Approved without any queries. Highly recommended for any flood risk or drainage work.”
Need a Flood Risk Assessment in London?
Free no-obligation fixed-fee quote for your London planning application within 24 hours.
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