| Source | Category | Authority | Refresh | Status |
|---|---|---|---|---|
| Hertsmere planning applications Authorised application and decision exports used to identify stalled, refused, withdrawn and nearby precedent signals. | planning | Hertsmere Borough Council | Weekly upload | manual |
| Hertsmere brownfield register Official brownfield entities inside Hertsmere, synchronised from the national Planning Data API. | public-assets | Planning Data / Hertsmere Borough Council | Quarterly check | connected |
| HMLR INSPIRE title polygons Indicative registered freehold polygon coverage used for parcel matching and gap investigation. | ownership | HM Land Registry | Monthly | configured |
| Corporate proprietor data Corporate-owned titles enriched against company status and ownership history. | ownership | HM Land Registry | Monthly | configured |
| Companies House company status Company status, dissolution and filing signals for corporate proprietors. | corporate | Companies House | Daily for watched companies | configured |
| Planning and environmental constraints Green Belt, flood, heritage and environmental evidence used to reduce false positives. | constraints | Multiple public authorities | Monthly | configured |