Data catalogue/ Environmental risk/ Invasive plants risk
Invasive plants risk
Schedule 9 invasive plant risk by UPRN: Japanese knotweed, giant hogweed, Himalayan balsam, and four more species. Sourced from the National Biodiversity Network Atlas, searched within a 5-mile radius. Returns a risk label and recorded sighting count per species.
{
"risk_type": "invasive_plants",
"uprn": 200001234567,
"results": [
{
"risk_type": "invasive_plant_japanese_knotweed",
"label": "High",
"score": 12,
"score_unit": "records",
"intersects": false,
"distance_m": 620,
"search_radius_m": 8050,
"count": 12,
"radius_description": "Within 5 miles",
"properties": {
"description": "12 records within 5mi"
}
},
{
"risk_type": "invasive_plant_rhododendron_ponticum",
"label": "Not detected",
"score": 0,
"count": 0,
"distance_m": null
}
// ... 5 more species
]
}Species risk at a glance
Seven results: one per species. Each result includes a proximity-based risk label and the number of recorded sightings within a 5-mile radius from the NBN Atlas database.
+ 3 more species (Floating pennywort, New Zealand pygmyweed, Cotoneaster): all Not detected for this property.
Response fields
Returns exactly 7 results: one per species. Species with no sightings within 5 miles return label: "Not detected" and count: 0 .
| Field | Type | What it is |
|---|---|---|
| risk_type | string | "invasive_plant_japanese_knotweed" (and 6 other species slugs) |
| label | string | Urgent / Very High / High / Medium-High / Medium / Low-Medium / Low / Not detected |
| score | integer | Number of sightings within 5-mile radius |
| score_unit | string | "records" |
| intersects | boolean | True if sightings found within 50m (Urgent band) |
| distance_m | integer | |null Distance to nearest sighting in metres. null if not detected |
| search_radius_m | integer | 8050–5-mile NBN Atlas search radius |
| count | integer | Total sighting records within 5 miles |
| radius_description | string | "Within 5 miles" |
7 species covered
Built for
Mortgage lending
Japanese knotweed within 7 metres of a structure can affect mortgage offers. Most high-street lenders have specific criteria. Pre-screen applications by proximity band before instructing a surveyor.
Surveyors & valuers
Flag high-risk properties before a site visit. The API gives you sighting count and distance: enough context to decide whether a knotweed-specific survey is warranted.
Property search platforms
Surface knotweed risk alongside EPC and flood data in your property detail view. Buyers increasingly research this before arranging viewings: useful signal for engagement.
curl "https://api.homedata.co.uk/risks/invasive_plants/?uprn=200001234567" \ -H "Authorization: Api-Key YOUR_KEY"
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