Flood Risk Assessment for a House-to-Flats Conversion
Flood-risk evidence for your conversion planning application
An FRA is not automatic for every house-to-flats conversion. The requirement and scope reflect the planning route, Flood Zone, site area, local policy, site conditions and proposal. RIDA reviews these factors and prepares evidence to support an informed submission. The report does not guarantee planning permission.
Get A Free No Obligation QuoteSee RIDA’s wider flood risk assessment for planning service for other development types.
Request a conversion FRA scope
Get A Free No Obligation QuoteWhat You Will Receive
| Technical deliverable | What this enables you to progress |
|---|---|
| Conversion-specific FRA scoped to your site and proposal. | Flood-risk evidence for the planning application. |
| Review of relevant flood zones, flood sources and available planning data. | A clear record of the risks requiring assessment. |
| Assessment of use, occupancy, access, floor levels and mitigation where relevant. | Planning and design discussions based on practical recommendations. |
| Identification of any further survey, modelling or technical work. | A defined next step where the available evidence is insufficient. |
The conversion issues we assess
Flood zones, use and occupancy
- Flood Zones 1, 2 and 3, site-specific planning data and local validation requirements.
- Risk from rivers, the sea, surface water, groundwater, sewers and reservoirs where relevant.
- Whether the proposed layout or occupancy affects flood-risk planning considerations.
- Safe access, finished-floor levels, flood resistance, resilience and residual risk where applicable.
You can check the site on RIDA’s Flood Map for Planning and consult the official Environment Agency Flood Map for Planning. Map data is an initial scoping input rather than a complete FRA.
Sequential and Exception Test position
RIDA can identify whether Sequential Test guidance or Exception Test considerations may affect the proposal. The applicable position is established from the planning context and the Flood risk and coastal change Planning Practice Guidance.
What RIDA needs to scope your assessment
- Property address — to review the site-specific flood and planning context.
- Existing and proposed plans — to define the conversion and assessment scope.
- Number, position and use of the flats — to review occupancy and floor arrangements.
- Planning reference or authority correspondence — to check validation points or consultee comments.
- Access details and known flooding, drainage or previous reports — to identify relevant evidence.
- Target submission date — to plan the commission.
You can check the long-term flood risk for an area before sending your enquiry. RIDA reviews your material, confirms a proportionate scope and fee, then sets out any further information needed.
Read about support from RIDA’s flood risk assessment consultants.
Send plans for a fee estimate
Request a QuoteHouse-to-flats conversion FAQs
Do I need a flood risk assessment to convert a house into flats?
The requirement is set by the planning route, Flood Zone, site area, local policy and proposal details. RIDA can review the address and plans to confirm a suitable scope.
Can RIDA work from existing drawings and flood information?
Yes. RIDA can review existing and proposed plans, flood records and prior reports. Further data, survey work or modelling may be requested if the available material cannot support the assessment.
Will the assessment address the Sequential Test or regulator comments?
The agreed scope can cover the Sequential Test position and responses to flood-risk planning comments. Exception Test evidence or separate technical work is quoted where applicable.
How much will a house-to-flats conversion FRA cost and how long will it take?
Request a scope and fee for your house-to-flats conversion
Send the property address, existing and proposed plans, flat numbers and layout, plus any planning correspondence. RIDA will review the information and confirm the proposed scope and fee.
Request your scope and fee
Request a Quote