Transparency · How it works
Data sources and methodology
Every evidence pack for broker review is built from structured, citable data. This page documents what we use and where it comes from — planning data sources UK lenders and developers can verify.
PlanSureAI does not scrape opaque third-party portals or rely on unaudited broker spreadsheets. Each named dataset below feeds the evidence pack where coverage exists. Coverage is England. Sold prices, appeal decisions, whether a council charges CIL and the national flood, heritage and ecology checks cover England. Planning evidence availability varies by council, and each pack identifies what is unavailable or has not been assessed. PlanSureAI does not calculate CIL amounts. Council-published constraints (conservation areas, Article 4, tree preservation, listed-building outlines) depend on what each council has published. Where a source is thin or unavailable for a site, packs say it was not assessed — an empty result is never shown as “none”.
Planning appeals (Planning Inspectorate)
| Records | 199,531 appeal decisions (Oct 2015 – Jul 2026) |
|---|---|
| Source | Planning Inspectorate appeal casework data |
| Coverage | England |
Land Registry transactions
| Records | 2.9M residential Price Paid Data transactions |
|---|---|
| Source | HM Land Registry Price Paid Data |
| Coverage | England and Wales |
CIL charging schedules
| Source | Each council's published charging schedule; whether a council charges CIL from planning.data.gov.uk |
|---|---|
| Last updated | As published by each council |
| Coverage | England: whether a council charges CIL is held for 146 authorities; residential rates for 8. Where no rate is held, the liability is shown as not assessed. |
Planning applications
| Records | Application reference, address, description, decision and dates |
|---|---|
| Source | PlanIt (planit.org.uk), which indexes council planning registers |
| Last updated | Nightly; applications received since 26 August 2026 |
| Coverage | Planning evidence availability varies by council. This pack identifies information that is unavailable or has not been assessed. |
EPC certificates
| Records | Domestic energy performance certificate data |
|---|---|
| Source | api.get-energy-performance-data.communities.gov.uk |
| Last updated | As published by the register |
Build cost
| Records | The developer's or QS's figure, labelled as stated; otherwise a product default |
|---|---|
| Coverage | No licensed build-cost benchmark is held. A product default is labelled "not a benchmark" and is never checked against one. |
How packs are assembled
Postcode and planning status are the inputs. PlanSureAI pulls from the datasets above where they cover the site, structures available evidence for the pack, runs a readiness check, and stamps a SHA-256 snapshot on export. Figures that appear in a pack are intended to trace to a named source; where a source is missing or not yet wired, the pack should surface the gap rather than imply full annex coverage.
PlanSureAI is an observational research tool. Data is used to structure evidence — not to give planning, legal, or financial advice.
See also Disclaimer and Privacy.