Data sources
We use UK public datasets. Every report cites the source for each data point.
Planning data
Designations, brownfield register, local plan policies (where available).
Update cadence: Varies by authority.
Environment Agency flood layers
Flood zone (river/sea) and surface water (pluvial) mapping.
Update cadence: Updated periodically by EA.
Historic England
Listed buildings, scheduled monuments, conservation areas (where provided).
Update cadence: National list updated regularly.
Natural England
SSSI, AONB, and other designations.
Update cadence: Updated periodically.
HM Land Registry Price Paid Data
Local context and comparable transactions where relevant.
Update cadence: Monthly updates.
How we separate facts from AI
In every report, the "facts layer" is built from the sources above. Each constraint is labelled with its source. The "AI commentary" section is clearly headed and separated — it interprets for planning-risk context but does not present interpretation as primary data.
Disclaimers
- SiteSift does not provide legal or planning advice. Obtain professional advice for specific sites and decisions.
- Data accuracy depends on upstream providers. We do not guarantee completeness or currency.
- Confirm with the local authority and relevant bodies for final decisions.