The data covers single residential property sales in England and Wales sold for full market value which have been duly lodged with the Land Registry. Notable exclusions include repossessions, auctions, part sales and corporate transactions. For full details see the Land Registry Price Paid FAQ.
Currently January 1995 - May 2017. Data for all sales lodged each month is released by the Land Registry in the last week of the following month, along with any corrections or late submissions for earlier months. The new data is incorprated in houseprices.io on the same day. To register for an email alert as soon as the next batch is available, please contact us.
.com and .co.uk were already taken! The .io country code top level domain is assigned to British Indian Ocean Territory, which with a population of about 3,000 hasn't made as much native use of its domain as most. A long time favourite with computer folk as a play on the term Input/Output it has lately found favour with startups in general and has recently begun to be treated as a global domain in Google search results.
Please contact us in the first instance and we'll check if it's something we've done wrong. If it turns out to be an error in the raw data provided by the Land Registry, they'll need to change it at source so the correction can propagate to all users of this data.