An apartment with 84㎡ of exclusive area is called a 34-pyeong unit because that 34 pyeong is the supply area, not the exclusive area. Converted directly, 84㎡ is 25.4 pyeong (1 pyeong = 3.3058㎡). The remaining eight or nine pyeong are shared residential space — stairs, corridors, lifts.
The confusion is not only that four different area terms exist. The bigger issue is that apartments and officetels use different bases as their marketed floor area. For the same 84㎡ of exclusive space, the pyeong figure in the listing and the space you can actually live in move in opposite directions.
Where the four area definitions divide
The terms stack in order of widening scope. Using the breakdown published by IBK Bank and KB Real Estate:
- Exclusive area (jeonyong myeonjeok) — everything inside your own front door: rooms, living room, kitchen, bathroom. This is the figure recorded in the property register and the building ledger, and the one that governs acquisition tax, property tax and housing subscription eligibility.
- Shared residential area — stairs, corridors and lifts used by residents of the same building.
- Supply area (gonggeup myeonjeok) — exclusive area plus shared residential area. This is the number behind the pyeong figure quoted for apartments.
- Other common area — the management office, senior centre and underground car park serving the whole complex.
- Contract area (gyeyak myeonjeok) — supply area plus other common area; the broadest measure of all.
One more sits outside the stack: service area, meaning the balcony. A balcony counts toward neither exclusive, common nor contract area, is excluded from the sale-price calculation, and appears in neither the property register nor the building ledger. It does not exist on paper, yet it becomes living space in practice.
Once a balcony is enclosed in a conversion, it is absorbed into the living room and bedrooms. Asia Economy reported that balcony extensions in Korean apartments add anywhere from 25㎡ to 40㎡ of service area. Against an 84㎡ exclusive area, that is more than 30% added entirely off the books.
Why 84㎡ becomes 34 pyeong
Converting exclusive area straight to pyeong, then deriving supply area at assumed exclusive-area ratios of 75% and 80%, shows exactly where the marketed pyeong figure comes from.
| Exclusive area (㎡) | Pyeong (exclusive) | Supply area at 75% (㎡) | Pyeong | Supply area at 80% (㎡) | Pyeong |
|---|---|---|---|---|---|
| 59 | 17.8 | 78.7 | 23.8 | 73.8 | 22.3 |
| 74 | 22.4 | 98.7 | 29.9 | 92.5 | 28.0 |
| 84 | 25.4 | 112.0 | 33.9 | 105.0 | 31.8 |
| 114 | 34.5 | 152.0 | 46.0 | 142.5 | 43.1 |
For 84㎡ to be called 34 pyeong, the exclusive-area ratio has to sit around 75%. In a complex reaching 80%, the same 84㎡ is marketed as a 32-pyeong unit. The familiar shorthand of 25 pyeong and 34 pyeong meaning 59㎡ and 84㎡ comes out of this same arithmetic.
Two practical consequences follow. First, the same 84㎡ label carries a different supply area in every complex. A lower exclusive-area ratio means more shared space, which changes the denominator when comparing price per pyeong. Second, subscription eligibility, taxation and loan assessment all run on exclusive area — including the 85㎡ national housing size threshold. The component-by-component breakdown of subscription scoring sits in the guide to cheongyak (housing subscription) point calculation.
Why an officetel feels smaller at the same 84㎡
Apartments and officetels advertise different area bases. The Hankook Ilbo notes that apartments market the supply area while officetels market the contract area — which folds in the underground car park and management office as other common area. Identical numbers, different scope.
The exclusive-area ratio makes the gap plainer. Both Asia Economy and the Hankook Ilbo put officetels at roughly 50% and apartments at roughly 80%. Applying each to 84㎡ of exclusive area produces this split.
| Item | Apartment | Officetel |
|---|---|---|
| Marketed area basis | Supply area | Contract area |
| Typical exclusive-area ratio | ~80% | ~50% |
| Marketed area for 84㎡ exclusive | 105㎡ (31.8 pyeong) | 168㎡ (50.8 pyeong) |
| Service area (balcony) | 25–40㎡ | Effectively none |
| Usable area after extension | 109–124㎡ | 84㎡ |
On paper the officetel is a 50-pyeong unit and the apartment a 32-pyeong one. In lived space the ranking reverses: 109–124㎡ against 84㎡. That structure is why the industry comparison cited by Asia Economy holds that a 59㎡ apartment offers usable space comparable to an 84㎡ officetel.
The pyeong figure in the listing is the result of what was added; the space you live in is the result of what was taken away.
Management fees follow the same logic. The Hankook Ilbo points out that officetels are structurally bound to charge higher common-area fees, since a larger share of common space means more upkeep distributed across households. Comparing only sale prices and monthly rent, while leaving the fee line out, produces a total-cost figure that does not hold. Tax and subscription questions specific to officetels are covered in the guide to when an officetel counts toward your housing tally.
What to check
- Whether the listing quotes exclusive or supply area. The same number 84 means more than eight pyeong of difference in usable space depending on which basis it uses.
- Exclusive area on the building ledger. The registered figure is always the exclusive area. Cross-checking the ledger or property register before signing exposes any gap with the advertised figure.
- Calculate the exclusive-area ratio yourself. Divide exclusive area by supply area. For an apartment, dropping below 70% signals an unusually large share of common space.
- Balcony extension status and scope. Confirm whether the extension is already done and whether its cost sits outside the quoted sale price — service area is excluded from that calculation.
- For officetels, confirm the contract-area basis. Divide the marketed pyeong figure by a 50% ratio to recover the real exclusive area, then compare it against an apartment in the same budget.
- The common-fee share on recent bills. This line is driven by common-area proportion, not exclusive area. Compare recent bills across units of similar size.
