Professional Flood Risk Assessments for planning applications and compliance
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A Flood Risk Assessment (FRA) is required for developments located in or near flood zones, areas with surface‑water risk, or sites affected by drainage constraints. It evaluates the likelihood of flooding, the impact on your development, and the measures needed to make your project safe and compliant.
Planning World prepares fully compliant FRAs for planning applications, extensions, new builds, conversions, and commercial developments — ensuring your proposal meets Environment Agency and local authority requirements.
When you need a Flood Risk Assessment
An FRA is required when:
Your site is in Flood Zone 2 or Flood Zone 3
Your site is in a surface‑water flood risk area
Your development increases footprint or impermeable area
You are building a basement or extending below ground
You are converting a building into flats
You are creating a new dwelling
Your council requests an FRA as part of validation
You are in a critical drainage area
You are near rivers, streams, canals, or coastal areas
Even small extensions can require an FRA if the site is in a risk zone.
For Flood Risk Assessments (FRA)
What your FRA package includes
A complete Flood Risk Assessment typically includes:
Flood zone classification
Environment Agency data review
Surface‑water flood risk analysis
Groundwater and drainage assessment
Site levels and topography review
Flood depth and hazard mapping
Sequential and exception test (if required)
Mitigation strategy and resilience measures
Safe access and egress assessment
Drainage and runoff recommendations
Full FRA report for planning submission
All reports are compliant with NPPF, Environment Agency guidance, and local policy.
Our process
A clear, structured workflow designed to satisfy planning requirements:
Site assessment We review flood maps, EA data, and local drainage constraints.
Risk analysis We assess fluvial, pluvial, groundwater, and surface‑water risks.
Mitigation strategy We recommend measures such as floor levels, drainage, and resilience.
FRA report preparation A full planning‑ready report is produced with all required evidence.
Submission & liaison We provide the FRA and submit it directly with your planning application.
Fees
Typical fees start from:
£295–£495 for small residential extensions
£495–£895 for new builds or conversions
£895+ for multi‑unit or complex sites
A fixed quote is provided after reviewing your site location and drawings.
Borough‑specific considerations
Flood risk requirements vary significantly between councils. We specialise in:
London boroughs — surface‑water risk, basements, drainage constraints
Kensington & Chelsea — strict basement policies and flood resilience
Westminster — tidal and surface‑water considerations
Camden — groundwater and drainage capacity
Lancashire authorities — river proximity, rural drainage, runoff impacts
Critical drainage areas — mandatory mitigation and runoff controls
Your FRA is tailored to your borough’s specific policy requirements.
Common mistakes to avoid
Applications are often delayed or refused when:
No FRA is submitted for a flood‑zone site
The FRA is generic or lacks site‑specific data
Mitigation measures are missing or unrealistic
Basement proposals ignore groundwater risk
Drainage impacts are not addressed
Access and egress routes are not assessed
Planning World ensures your FRA is detailed, compliant, and planning‑ready.
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Why choose Planning World
Fully compliant FRAs for all development types
Fast turnaround for urgent planning deadlines
Detailed, site‑specific analysis
Coordination with engineers, and drainage consultants
Borough‑specific expertise
Clear mitigation strategies and actionable recommendations
