# The Price Machine

> Thirty years of London getting further away.

- Category: Housing
- Cadence: monthly
- Status: Published on a monthly cadence.
- Dataset key: `price-machine`
- Source: [Land Registry](https://www.gov.uk/government/collections/price-paid-data)
- Licence: Open Government Licence v3.0 — [terms](https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/)
- Canonical page: [https://londongraph.com/g/the-price-machine](https://londongraph.com/g/the-price-machine)
- Machine-readable record: [https://londongraph.com/data/the-price-machine](https://londongraph.com/data/the-price-machine)

## Methodology

HM Land Registry's UK House Price Index for Greater London, one average price per month since January 1995. The Price Paid release covering individual sales runs to several gigabytes of CSV; UK HPI publishes the monthly aggregate as linked data, which is the same figure without the download.

## Visualisations

- [Average price](https://londongraph.com/g/the-price-machine): Follow the official London average house price from 1995 onward.
- [Monthly change](https://londongraph.com/g/the-price-machine?view=change): Show each published month's change from the preceding month.
- [Cash vs mortgage](https://londongraph.com/g/the-price-machine?view=cash-mortgage): Compare average prices for cash-financed and mortgage-financed purchases.
- [Indexed](https://londongraph.com/g/the-price-machine?view=indexed): Set the first visible average to 100 to make proportional change readable.

## Citation guidance

Attribute the original publisher named above and identify LondonGraph as the visualisation and methodology layer. Do not describe live values as a historical census, and do not present placeholder values as observations.