Data sources & disclaimers
Realyst uses the following official data sources. Each source has specific attribution and disclaimer requirements. By using our service you acknowledge these terms.
Postcodes & geography (NSPL / ONS)
Postcode lookups, coordinates, LSOA codes, urban/rural classification, and local authority data are derived from the National Statistics Postcode Lookup (NSPL) / ONS Postcode Directory.
Required attribution:
Source: Office for National Statistics licensed under the Open Government Licence v.3.0.
Contains Royal Mail data © Royal Mail copyright and database right 2025.
Contains OS data © Crown copyright and database right 2025.
House prices (HM Land Registry Price Paid Data)
Sale prices, area averages, price‑vs‑average comparisons, and capital growth figures are based on HM Land Registry Price Paid Data.
Required attribution:
Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0.
Disclaimer: HM Land Registry uses reasonable skill and care in providing the data but cannot guarantee it is fit for your intended purpose. Price Paid Data is based on information provided during registration and may not reflect the true value of a property at the time of sale. Our calculations (e.g. area averages, growth rates) are for information only and do not constitute advice or a valuation.
Energy Performance Certificates (EPC)
EPC ratings, floor area, and habitable rooms used for price matching and property analysis come from Energy Performance of Buildings Data – England and Wales (Open Data Communities, Department for Levelling Up, Housing & Communities).
Attribution: EPC data © Crown copyright. Address data within the EPC dataset may contain Ordnance Survey and Royal Mail intellectual property. Use of EPC data is in accordance with the Open Data Communities terms and the Department’s published licence.
Index of Multiple Deprivation (IMD)
Deprivation scores and deciles (e.g. "Least deprived 20%") are derived from the English Index of Multiple Deprivation (Ministry of Housing, Communities & Local Government / DLUHC, ONS geography).
Attribution: Source: Office for National Statistics and DLUHC licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right.
Crime statistics
Crime statistics by area are based on data.police.uk (street-level crime and anti-social behaviour data for England, Wales and Northern Ireland).
Attribution: Crime data from data.police.uk is licensed under the Open Government Licence v3.0. This data does not represent official statistics; it is provided for information only.
Flood risk
Flood risk indicators (surface water, groundwater) are derived from Environment Agency and related flood risk data for England.
Attribution: Flood risk data © Crown copyright. Licensed under the Open Government Licence v3.0. This is indicative data only and should not be relied upon as the sole basis for property decisions; you should use official flood reports and surveys where appropriate.
Census and population
Population and household counts by area are derived from Office for National Statistics Census and related statistics.
Attribution: Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right.
Rental and other estimates
Where we show estimated rents or yields, these may use ONS or other published statistics as inputs. They are estimates only and do not constitute advice or a guarantee of income.
General disclaimer
All data is used in good faith for informational and analytical purposes. Realyst does not guarantee the accuracy, completeness, or fitness for purpose of any third-party data. Property investment and purchase decisions should not be based solely on this site; you should carry out your own due diligence and seek professional advice where appropriate.