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Flood Risk Assessment for Minor Development

RIDA prepares proportionate flood risk assessments for householder and qualifying minor-development proposals in England. You receive a planning-focused technical report addressing your site, proposed works, relevant flood sources and local requirements, ready to support planning validation, an application or a response to a flood-risk information request.
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21+Years Of Experience

When Minor Development Needs a Flood Risk Assessment

In England, minor development for flood-risk policy includes householder development, minor non-residential extensions creating less than 250 square metres of additional floor space, and alterations that do not increase a building’s size.

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The evidence required is set by the proposal, flood zone, other flood sources and local planning requirements. Review the official Flood risk and coastal change Planning Practice Guidance and the Environment Agency Flood Map for Planning. You can check your site on the Flood Map for Planning through RIDA before commissioning.

Standing advice may support a straightforward proposal. Specialist assessment may be needed for deeper flooding, multiple flood sources, cumulative extensions, site-level constraints or a planning authority request for further evidence.

For larger or broader schemes, see RIDA’s flood risk assessments for planning permission.

Prefer to discuss the site first? Call RIDA using the verified number shown in the website header.

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What You Will Receive

Technical deliverableWhat this enables you to progress
Proportionate flood risk assessment reportPlanning validation, application submission or a response to a case officer
Review of relevant flood sources, mapped flood zones and available local evidenceA site-specific risk position based on more than project size
Assessment of the proposal and proportionate mitigation measuresDesign decisions addressing the identified flood risk
Recommendations on levels, access, resilience and surface-water management where relevantDrawings and supporting planning evidence
Identification of further technical workEarly commissioning of modelling, drainage, SuDS or planning-test support

Proportionate Scope and Information Needed to Start

When additional technical work may be needed

Hydraulic modelling, drainage or SuDS evidence, or Sequential and Exception Test support may sit outside a straightforward FRA. RIDA’s flood risk consultants can identify the suitable scope. Fees reflect the site, proposal, available data and requested evidence; see the flood risk assessment cost guidance.

Send these details for a quote

  • Site address — to review the location-specific planning and flood context.
  • Site and proposal plans — to define the works and assessment boundary.
  • Planning correspondence or validation request — to identify the authority’s stated concerns.
  • Available flood or drainage records — to establish the existing evidence base.
  • Target submission date — to confirm the proposed programme.

You can check the long-term flood risk for an area before sending your enquiry.

Relevant Minor-Development Experience

Minor Development FRA FAQs

Do I need a flood risk assessment for a minor development?

An FRA may be required where your site lies within a relevant flood-risk area, another flood source affects the proposal, or the planning authority requests evidence. The project’s small scale does not remove the need automatically.

Can I use Environment Agency standing advice or complete the assessment myself?

Standing advice and official templates may suit straightforward cases. Appointing a consultant is appropriate where site levels, local evidence, mitigation, cumulative development or technical planning comments need professional assessment.

What information do you need to quote for a minor-development FRA?

Send the site address, proposal plans, a description of the works, planning correspondence, available flood or drainage records and your target submission date.

What happens if the planning authority needs modelling, drainage information or further flood-risk evidence?

RIDA will identify the extra work and define a suitable scope. This may include hydraulic modelling, drainage or SuDS evidence, revised mitigation advice, or support for the relevant planning tests.

Request a Minor-Development FRA Quote

Send your site address, plans and planning correspondence. RIDA will review the available information and confirm the proposed scope, fee and programme.

Prefer to discuss the site first? Call RIDA using the verified number shown in the website header.

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