Report an error

If you live somewhere we cover and a number looks wrong, it probably is. Telling us is the fastest way it gets fixed.

Only 36% of a typical budget here traces to a published source — the rest is modelled, and modelled figures go stale or start wrong. We would much rather be corrected than believed.

CityWhat is wrong

What should it say?Where does the right figure come from?Optional, and the single most useful thing you can add — a correction with a source can be acted on the same day. Without one it still gets read; it just waits for someone to confirm it.

The correct figure, if you know it

Your emailOnly used to tell you what happened to this report. Never added to a list.

What happens to it

1. It lands in the review queue. Nothing on the site changes yet. A single report never moves a published figure on its own — otherwise the number would belong to whoever filled the form in most often.
2. It is checked against a source. If you gave a link, against that. If not, against whatever authoritative source covers the field — an operator’s tariff page, a statistics office, a rent index.
3. The change is proposed as a reviewed diff with the source and the size of the change attached, and a person approves it before it ships.
4. The figure carries its new provenance. A corrected number shows where it now comes from and the date it was confirmed, so the next reader can see the work rather than trusting it.

Other ways to help

If you want to add a price rather than dispute one, the contribute page takes figures for a specific city and metric and shows you how they compare with what other people have reported. For anything that is not a data problem, the contact page has the address.