About & data methodology

australianplanning is an independent reference for what Australian property has actually sold for, built entirely from government open data. It sells nothing and lists nothing.

What the data is

Every figure on this site traces to a sale recorded by a state valuation authority — a completed transaction, lodged and published as public record. It is historical fact. It is not an estimate of what any property is worth today, and nothing here should be read as a valuation or as advice.

How it is processed

• Sales with no date, no price, or no suburb are dropped. Roughly 2.6% of the oldest records carry only a legal description (“LOT 286 DP 27040”) with no street or suburb at all. A sale that cannot be placed cannot appear on a suburb page or in a suburb median, and showing nothing beats showing something misleading.
• Transfers of $100 or less are flagged as nominal — family and related-party paper transactions — and excluded from every median, while still being visible in the sales tables.
• A handful of records carry impossible prices (the highest seen was $990,625,000,001, a keying error in the register). Anything above one billion dollars is dropped.
• Medians are only published where there are enough sales to mean something: three or more in a year for a suburb series, twenty or more for a state-level index, fifty or more before a suburb is ranked in the market report.

How it is served

The site is a Cloudflare Worker reading JSON from R2, with no database. Sales are sharded one object per postcode and every aggregate is precomputed at build time, so rendering a page reads a small index and at most one shard — never a scan across the whole corpus.

Coverage, honestly

NSW loaded so far. Australia has no single national sales register: each state publishes on its own terms and some do not publish transaction-level data at all. Sources sets out exactly what is available where.