Understanding the Pyeong (평)
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The pyeong is the unit Korean apartments are still discussed in, at about 3.306 square metres — identical in size to the Japanese tsubo, from which it was administratively imported during the colonial period. It was banned from official use in 2007 and remains in near-universal informal use.
Why a banned unit is still everywhere
Korea's 2007 enforcement of metric-only measurement in official transactions removed the pyeong from contracts, registrations and advertising subject to the rule. It did not remove it from conversation, and it did not change the housing stock: apartment sizes were designed around pyeong bands, so the standard Korean apartment sizes — the 24-pyeong, 32-pyeong and 45-pyeong types — remain recognisable categories.
The result is a dual vocabulary. Listings state square metres, buyers translate back to pyeong, and construction and interior-fitting quotes are still commonly given per pyeong. Any dataset scraped from Korean property listings will contain both, sometimes in the same field.
Supply area versus exclusive area
The larger risk in Korean property figures is not the unit but which area it measures. Gongyong myeonjeok (supply area) includes a share of common corridors, stairs and lobbies; jeonyong myeonjeok (exclusive area) counts only the interior of the unit. A "32-pyeong apartment" conventionally refers to supply area, and its exclusive area is typically around 25 pyeong.
Converting pyeong to square metres without carrying which area definition applies produces figures that look precise and compare nothing. International comparisons of Korean housing size are frequently overstated for exactly this reason, because supply area is the number that circulates.
The regional family
Pyeong, tsubo and ping are the same size, all descending from the square ken of the East Asian modular building tradition. This makes Seoul, Tokyo and Taipei property data directly comparable once the area definition is normalised, which is unusual and genuinely useful for regional market analysis.
Above the pyeong, agricultural land uses the danbo (300 pyeong, about 991.7 m²) and the jeongbo (10 danbo). These persist in rural land records and agricultural statistics even where urban records have fully metricated.
Practical conversion advice
For any figure that will be filed, cited or contracted, use square metres — the pyeong has no legal standing in Korean official transactions. For market comparison and for reading listings, keep the pyeong figure alongside, because the price expectations attached to the standard pyeong bands are the actual market structure.
A useful sanity check: pyeong multiplied by roughly 3.3 gives square metres, and square metres divided by 3.3 gives pyeong. If a converted figure implies a Korean apartment of implausible size, the supply/exclusive distinction is the first thing to check, not the arithmetic.
Interior and renovation work is also quoted per pyeong, and here the relevant figure is usually the exclusive area, since that is the surface actually being fitted out. A quote based on the supply-area pyeong count will therefore overstate the work by roughly a quarter. Asking the contractor which area their per-pyeong rate applies to, before comparing bids, converts an apparently large price difference between two firms into a like-for-like comparison surprisingly often.
For anyone building a dataset of Korean housing, the safest schema stores the square-metre figure, the area definition it refers to, and the source of both. Derived pyeong values can then be generated on demand, which keeps the legal figure authoritative while still producing the numbers Korean readers expect to see.
Common mistakes to avoid
- Pyeong has no legal standing in Korean official transactions since 2007 — file in square metres.
- Apartment pyeong figures usually mean supply area, which includes common space; exclusive area is roughly 20–25 per cent smaller.
- Pyeong, tsubo and ping are the same size, but the areas they measure are defined differently by country.
Sources for this section
- Korean Agency for Technology and Standards — 2007 metric enforcement
- Ministry of Land, Infrastructure and Transport (Korea) — housing area definitions
- Korea Real Estate Board statistical definitions (supply vs exclusive area)