A property can have several price figures attached to it: an asking price, a recorded transaction and an automated estimate. Label each one before comparing them. Different figures may describe different moments or questions.
What to check.
Label the type of price
Keep advertised prices separate from completed transactions. If a figure is an estimate, look for the provider’s explanation rather than treating it as a recorded sale.
Check address and timing
Confirm that a result concerns the same house or flat and note the event date. A recent sale may not yet appear in an official dataset.
Use the underlying evidence
Where a portal shows Land Registry sale data, compare the address and transaction details with the official source. Retain useful listing context separately from the price record.
What the evidence cannot tell you.
HouseDossier is independent of Rightmove and Zoopla. It does not promise access to their private listing archives or reproduce every transaction; source coverage and update dates matter.