Planning and Flood Risk

What this guide helps you do

Use this guide to understand the flood-risk questions a planning proposal must answer. Start with official information for the exact place and decision; county totals, nearby station points and old incidents are context only.

Practical decision path

• Check planning zones and every relevant flood source.
• Read the local strategic flood-risk assessment and validation requirements.
• Confirm whether a site-specific assessment is required and who should prepare it.
• Address access, evacuation, levels, drainage, climate allowances and safe lifetime where relevant.
• Keep written responses from the planning authority and statutory consultees.

Evidence to keep

• The exact address or site boundary, source URL and date checked
• Relevant maps, searches, messages, photographs and professional reports
• Written policy, planning, landlord, contractor or authority responses
• Assumptions, unresolved questions and the next review date

Important limits and mistakes to avoid

• Requirements depend on site, proposal and current policy.
• Do not copy levels or allowances from an old or neighbouring report.
• Planning approval does not guarantee insurability or safety in every event.

Questions to ask before deciding

• Which policy, flood source and development lifetime applies?
• What evidence does the local planning authority require?
• Who owns each technical assumption and design measure?
• How are access, exceedance and residual risk managed?
• Who will inspect and maintain the measures after completion?

When to get specialist help

Use competent professional advice when safety, structure, electrical or gas systems, contaminated water, planning consent, drainage design, insurance cover or a property transaction depends on the answer. During an emergency, follow emergency services and official warning instructions rather than this guide.

Final checklist

• Recheck the official source before acting
• Separate current warnings from long-term and designated-area information
• Confirm who is responsible for the next action
• Keep evidence and advice in writing
• Review after an incident, material change or updated guidance