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Data sources

Last updated 11 November 2026

Everything Sagashi tells you about a listing comes from the sources below, or from the alert itself. Sagashi (ABN 53 838 751 348) describes what each source says and never scores a listing or a place. When a source is too old to support an answer, Sagashi says it can't check rather than giving one.

Questions: privacy@sagashi.au.

The listing

  • What the alert said. The address, price as written, rooms and the portal's link are taken from the realestate.com.au or Domain alert sent to your Sagashi address. Sagashi never visits the listing's page. Alerts don't state a property type, so type is not checked.
  • What an agency's site said. Some listings' address, position, property type, rooms, price as written and listing date are read from the agency's own listing page: Ray White's office sites. Pages are fetched nightly by Cloudflare's verified crawler, which follows each site's robots.txt, and a page is fetched at most once a week. Sagashi keeps the facts and a link to the page, never its description or photos. The suburb is the official one at the listing's position, not the agency's. An agency's listing is shown to every buyer it fits, and placed on the map like any listing; one from a buyer's own alert is shown only to them.
  • Question pages. A public question page checks homes the same way, from these same sources, and shows only listings from agencies that agreed to appear on public pages. It never shows a listing from a buyer's own alert. An answer is worked out when the page is read and reused for at most an hour. The page shows no date or time.
  • Suburbs. The suburb list is from G-NAF, © Geoscape Australia, licensed by the Commonwealth of Australia under the Open G-NAF End User Licence Agreement.
  • Where it is. Each listing is placed on the map once, when it arrives: at its address's point on the lot or building in G-NAF, © Geoscape Australia, licensed by the Commonwealth of Australia under the Open G-NAF End User Licence Agreement, or, for an address G-NAF doesn't hold, by Google's Geocoding API. Some answers need the point on the building and say so when a listing was only placed on its street.
  • Maps. Google Maps.

Commute

  • Public transport. Worked out by Sagashi from Transport for NSW's public transport timetable (GTFS), every train, metro, bus, ferry and light rail service, under a Creative Commons Attribution licence (CC BY). The timetable is refreshed every week and not used once it is more than 14 days old; public transport commutes then say they can't be checked yet. Journeys are timetabled, not live running.
  • Walking, in a public transport journey. Worked out as a straight line lengthened by 30% for streets, at 4 km/h. No single walk is longer than 20 minutes, and changing from one service to another allows at least 3 minutes.
  • Driving and cycling. Google's Routes API.
  • The journey on a listing is looked up when you open its commute row and isn't kept. Only a public transport commute is checked in advance, and only it can rule a listing out: its minutes are kept for 30 days, or until a newer timetable replaces the one they came from, and it is then checked again. A driving or cycling journey is shown against your longest trip, and nothing about it is kept.

Family

  • School zones. NSW Department of Education, school intake zones (CC BY). A zone is checked only on the point on the building, because a boundary can run between neighbours. Zones more than 120 days old aren't used. Zones can change: confirm with the school before you buy.
  • School facts. NSW Department of Education, the public schools master dataset and enrolments by head count (CC BY). Catholic and independent schools are from ACARA's school list, via the Digital Atlas of Australia (CC BY 4.0). Sagashi shows only the facts they publish, never results, rankings or ICSEA; each school links to My School for its results.
  • Nearest schools. Measured in a straight line, up to 20 km, not as a journey. If you set how far you'll travel to them, a home with none of your chosen kinds that close is ruled out.
  • Childcare. The Australian Children's Education & Care Quality Authority's National Registers, used with ACECQA's permission. Services are listed by suburb, alphabetically, with ACECQA's overall rating word for word. If you choose kinds of childcare, a home whose suburb lists none of them is ruled out. A list more than 180 days old isn't shown or used.

Planning

  • Zoning is from the NSW Government's planning maps, © State Government of NSW (CC BY 4.0). Sagashi uses it to compare a house with houses in the same zone in Sold nearby, and, if you choose a kind of area, to rule out a home whose lot is zoned for something else.
  • Sagashi checks the point on the building, and checks again every 90 days.

Development

  • The NSW Planning Portal's Online DA data, © State Government of NSW (CC BY), copied daily. If the copy hasn't been updated for 3 days, Sagashi says development can't be checked. If you choose to avoid major development, a home with a major project within 500 m is ruled out.
  • Shown: applications being assessed, or approved, lodged or updated in the last two years, one per address. Small is under $5k, medium $5k to $100k, large over $100k. A major project costs over $5m and is shown up to 500 m away; the others within 200 m. Distances are straight-line.
  • Applications not yet lodged aren't shown.

Sales

  • The NSW Valuer General's bulk property sales information, © Crown in right of NSW through the Valuer General (CC BY-NC-ND 4.0), used in Sagashi with the Valuer General's approval. Sagashi keeps the last 10 years for Greater Sydney and adds each month's new sales. If its copy is more than 45 days old, Sagashi says sales can't be checked.
  • Each sale is shown as recorded: its price, the month it was contracted, and its land or unit. Sagashi never estimates a value, averages prices or compares them with a listing's price.
  • Sold nearby, for a unit: sales in the same building in the last 12 months, the closest unit numbers first. For a house: houses sold in the last 12 months within 1 km in a straight line, in the same zone, with land within 10% of the house's own, from its last recorded sale.
  • Sales are placed using G-NAF, © Geoscape Australia, licensed by the Commonwealth of Australia under the Open G-NAF End User Licence Agreement. Sales appear weeks after contract, once recorded.

Nearby

  • Google's own map and search results (Google's Maps Embed API), loaded in your browser when you open a listing's Nearby row, searching near the listing's address. Sagashi looks nothing up and keeps nothing from it.
  • Places are within 1.2 km in a straight line, about a 15-minute walk, and distances are straight-line, not walking times.

Suburb

  • Who lives here. Australian Bureau of Statistics, 2021 Census (CC BY 4.0), for the few streets around the house where it was placed on its street or building, otherwise the whole suburb, each beside Greater Sydney. A figure with fewer than 30 people or homes behind it isn't shown. Sagashi never shows ancestry, birthplace, language, religion or income.
  • Safety. NSW Bureau of Crime Statistics and Research, recorded criminal incidents by suburb (CC BY): offences recorded by police over five complete years, and the latest year's rate per 100,000 people beside NSW's. Sagashi never calls a place safe or unsafe.

Not checked

  • Flood. No source Sagashi has found covers Sydney reliably. Ask the council, or see the planning certificate.
  • Heritage, bushfire and aircraft noise. Not checked. The council's planning certificate records them.