Know the Flood Risk Before Your Customer Does
Property-level flood risk for a property in England: pass a UPRN, get back a structured risk score in milliseconds. River flooding, sea flooding, and surface water assessed separately. Standard Low / Medium / High / Very High labels with numeric scores for easy integration.
Pay as you go: 100 tokens = £1. First top-up matched 100%.
One UPRN. Instant flood risk.
Every property in Great Britain has a UPRN (Unique Property Reference Number). Pass it to the flood risk endpoint: you get back structured risk data covering both river/sea flooding and surface water flooding, each with a label, numeric score, and description.
Don't have a UPRN? Use our address lookup endpoint to resolve an address in Great Britain to its UPRN first.
curl "https://api.homedata.co.uk/risks/flood/?uprn=100023336956" \ -H "Authorization: Api-Key YOUR_API_KEY"
{
"risk_type": "flood",
"uprn": "100023336956",
"location": { "lat": 53.4058, "lon": -2.1843 },
"results": [
{
"risk_type": "flood_rivers_sea",
"label": "Low",
"score": 2,
"score_unit": "band",
"intersects": true,
"distance_m": 0,
"search_radius_m": 0,
"count": 1,
"radius_description": "At property",
"properties": {
"description": "Between 1 in 1,000 and 1 in 100 chance of flooding each year",
"confidence": "high"
}
},
{
"risk_type": "flood_surface_water",
"label": "Medium",
"score": 3,
"score_unit": "band",
"intersects": true,
"distance_m": 0,
"search_radius_m": 0,
"count": 1,
"radius_description": "At property",
"properties": {
"description": "Between 1 in 100 and 1 in 30 chance of flooding each year",
"confidence": "high"
}
}
]
}
What the API returns
Two flood risk assessments per property (river/sea flooding and surface water flooding) both mapped to a standard label and numeric score.
River & Sea Flooding
Risk of flooding from rivers or the sea. Based on Environment Agency and Natural Resources Wales modelling. Returns Low, Medium, High, or Very High.
Surface Water Flooding
Risk of flooding from surface water (rainfall that can't drain fast enough). Often affects urban areas regardless of proximity to rivers. Same four-tier labelling system.
Standardised Output
Every risk returns a human-readable label (Low/Medium/High/Very High), a numeric score for sorting, and a properties.description string with plain-English probability, e.g. "Between 1 in 100 and 1 in 30 chance of flooding each year".
Full Risk Suite
Flood is one of 7 risk types available via the same endpoint. Also covers: radon, noise (road/rail), landfill proximity, coal mining, air quality, and invasive plants (Japanese knotweed + 5 others).
National Coverage
England coverage. Any residential or commercial property with a UPRN, from terraced houses to industrial units. Scotland: available for some risk types.
Pre-computed at index time
Risk data is pre-computed and indexed, not calculated on the fly. Safe to embed in customer-facing flows.
Who uses flood risk data
Flood risk is a first-class data point across insurance, conveyancing, and proptech. Here's how teams embed it.
🏠 Conveyancing platforms
Surface water and river flooding are material facts that solicitors must disclose. Embed flood risk directly into your property report generation flow, zero manual lookups required.
🏦 Mortgage & insurance underwriting
Pre-screen properties at application stage. Flag high-risk properties for manual review or specialist terms. Integrate into your risk scoring pipeline via API, no manual map lookups.
🔍 Property search & portals
Show flood risk as a badge or filter on listing pages. Buyers increasingly search by environmental risk: flood risk is a top-3 concern alongside price and transport links.
📊 Portfolio risk management
Assess flood exposure across a property portfolio in bulk. Landlords, REITs, and housing associations use the API to screen acquisitions and model climate risk at portfolio level.
All risk types, one endpoint
Swap flood for any risk type in the path. Same response shape, same labels, same API key.
Coming soon: ground stability (shrink-swell clay, BGS data), listed buildings (Historic England), conservation areas. Not yet callable: API will return an error for these types until released.
Get your API key
Pay as you go — 100 tokens = £1, first top-up matched 100%. From signup to first API call in under 5 minutes.