Methodology & disclaimer

Data source

Sold prices come from HM Land Registry Price Paid Data (England & Wales), filtered to Welsh transactions using postcode prefixes and local authority / county fields. The data is published under the Open Government Licence. Contains HM Land Registry data © Crown copyright and database right 2026.

What we calculate

• Average — arithmetic mean of sale prices in the selected set.
• Median — middle price when sales are ordered (more robust to outliers).
• Year-on-year — comparison of average prices for completions in the current calendar year vs the previous year within the loaded dataset (requires enough sales in both years).
• Area matching — postcode prefixes and place-name rules defined per area guide (not formal statistical geographies in every case).
• Postcode district — outward code only (e.g. CF10 from CF10 1AA).

Limitations

• Land Registry data lags completion by weeks or months.
• Not all transactions appear immediately; the site may hold a rolling subset (e.g. recent years) rather than the full historic file.
• New-build and cash sales are included when present in Price Paid Data.
• Commercial and non-standard property types may appear as “Other”.
• LTT, SDLT and cost estimators are illustrative and may not reflect your exact circumstances (first-time buyer relief, companies, shared ownership, etc.).

Not advice

Properties.wales is an independent information tool. It is not a substitute for advice from a solicitor, mortgage adviser or surveyor. Always verify figures against primary sources (Land Registry, Welsh Government, HMRC) before making decisions.

Contact

For data corrections or partnership enquiries related to the properties.wales project, use the channels published on the About page.