Ask plain-English questions about the London property market. Every figure comes from HM Land Registry public data — every calculation is published so you can verify it yourself.
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Type your question naturally — median prices, borough comparisons, affordability trends, planning evidence.
Every figure is sourced from HM Land Registry. Charts and planning evidence reports included.
OpenProp runs on HM Land Registry Price Paid Data (Crown copyright, open licence). Our validation notebook and calculation scripts are published on Kaggle — the same logic that powers this tool. Open scripts, open methodology, open results. We're not hiding anything.
View our open validation notebook on Kaggle →
Professional users are encouraged to verify results independently. Found a discrepancy? Report it via the Kaggle link above.