Flood Risk Assessments & Drainage Strategies in Cardiff
Independent flood risk consultants serving Cardiff and surrounding areas. Planning-ready FRAs and SuDS drainage strategies from £295, delivered within 3–5 working days.
Flood Risk Assessments in Cardiff
Cardiff planning applications require a Flood Consequence Assessment (FCA) under TAN15 (2024) rather than a standard English FRA. We prepare FCAs for all Welsh LPA areas. Learn more about TAN15 FCAs →
Flood Risk Environmental provides Flood Risk Assessments, SuDS drainage strategies and detailed drainage design for planning applications across Cardiff and the wider South Wales region.
Cardiff has significant flood risk from the River Taff and the Severn Estuary, with extensive areas of the city in high flood risk DAM zones under TAN15 (2024). Cardiff Council and Natural Resources Wales (NRW) are the key consultees for flood risk in Cardiff. Planning applications in Cardiff's flood risk areas require a Flood Consequence Assessment (FCA) under TAN15 (2024) rather than a standard English FRA.
Our reports are prepared by a qualified consultant with over 17 years' experience and written specifically to satisfy the requirements of Cardiff Council and Natural Resources Wales (NRW) as the statutory consultee for flood risk in Wales.
Services in London
- Flood Risk Assessments — from £295
- SuDS drainage strategies for planning
- Detailed SuDS and drainage design
- LLFA SuDS proforma completion (Cardiff Council / SAB)
- 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 Cardiff?
Planning applications in Cardiff require a Flood Consequence Assessment (FCA) under TAN15 or 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 Cardiff — 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 Cardiff Council 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 Cardiff 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 Cardiff 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 Cardiff?
Free no-obligation fixed-fee quote for your Cardiff planning application within 24 hours.
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