Bangkok Building Atlas

Registered condominiums and rental apartment buildings in Bangkok, Nonthaburi and Samut Prakan, from open government data and open map data, October 2026

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About this data · Data quality: Fair, about half the counts exact

Sources

  • Treasury Department condominium appraisal list: every condo with unit title deeds, with name, district, buildings and floors. This is the master list. Published on gdcatalog.go.th as "Open Data Common".
  • Department of Lands condominium search (dol.go.th/building): name, buildings and exact unit count for every registered condo, matched by name to 2,079 of the Treasury condos.
  • National Housing Authority: registered condo projects with unit counts (public housing), a 2021–22 survey of low-rent apartments with room counts, and project location maps.
  • OpenStreetMap (ODbL) and Overture Maps: locations, English names and most apartment buildings.

Quality

  • The list of condos is authoritative. 45% now have an exact unit count from the Department of Lands register, plus 34 public-housing condos from the National Housing Authority. The rest are estimates (floors with flats × typical flats per floor): right on average, but often off by a third or more for a single building.
  • Condos are placed by matching their Thai names against open map data in the same district. 63% matched; some matches are loose and marked as such. The rest are listed by district but are not on the map.
  • Apartment buildings come from crowd-sourced map data. Only low-rent ones from the housing survey have room counts.
  • The licence named on the government files ("Open Data Common") could not be found, so its terms are unconfirmed.

How complete is the data?

Registered condos are close to complete: only very new projects whose unit deeds are not yet issued should be missing. Only about two-thirds of them are on the map, though, and just under half have an exact unit count. Rental apartments are the weakest part of any of these maps: only what people have put on OpenStreetMap and Overture, plus the low-rent survey, which is probably under half of the area's rental buildings. The Department of Lands also publishes monthly lists of condo juristic persons; those are not included yet.

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Sources: Treasury Department condominium appraisal list (every condo with unit title deeds: names, buildings, floors) · National Housing Authority registered condos and 2021-22 low-rent rental survey (unit and room counts) · Department of Lands condo registrations (calibration) — via gdcatalog.go.th, Open Data Common · © OpenStreetMap contributors, ODbL (boundaries, basemap, outlines, names) · Overture Maps places, CDLA-Permissive-2.0 (names and locations). Most unit counts are estimates. Condos are placed by matching their names, so some are missing from the map or placed loosely.