The Seoul Metropolitan Government has announced a plan to supply 310,000 housing units by 2031. The number is large, but for this supply to reach a jeonse tenant's rent bill, it must pass through several stages. There is a sequence of authorization → groundbreaking → completion → move-in, and delays accumulate at each stage. How to read a supply plan is ultimately a question of how you calculate that lag.
The 310,000-Unit Plan: What Does It Contain?
According to the Korea Economic Daily, the Seoul Metropolitan Government set a target of "supplying 310,000 housing units by 2031 to deliver results citizens can feel." Annualized, that is roughly 50,000 units. Given that Seoul's annual average authorization volume has been on the order of tens of thousands of units, this is an exceptionally high target.
The area particularly worth noting in the supply plan is Yongsan. The same outlet reported that redevelopment and reconstruction around Yongsan Station and the Han River are gaining momentum. Yongsan is a transportation node with high Han River accessibility — a location where full-scale development could directly affect jeonse supply conditions for that living zone. However, "gaining momentum" describes the direction of project progress only; actual move-in timing is not confirmed at this stage.
Here is the core issue. The moment the 310,000-unit figure appeared in the press, market participants took that number as a signal of future supply. Expectation psychology can already be reflected in current jeonse contract negotiations. But the point at which actual volume is supplied to the jeonse market is at minimum three to seven years away. This gap is the key variable in "the speed at which supply permeates jeonse prices."
The Path by Which Supply Reaches Jeonse Prices
The relationship between move-in volume and jeonse prices is not a straight line. The routes through which supply affects jeonse prices can be broadly divided into three.
| Route | How It Works | When It Is Felt |
|---|---|---|
| Direct supply effect | New apartment move-ins increase jeonse listings → downward price pressure | Within 6 months of move-in date |
| Relocation demand counter-effect | Redevelopment/reconstruction groundbreaking causes existing tenants to relocate → nearby jeonse demand increases → short-term upward price pressure | 1–2 years around groundbreaking date |
| Expectation psychology front-loading | Large-scale supply announcement → both landlords and tenants adjust bargaining power → preemptive reflection in current prices | Immediately after announcement |
The third route — front-loading through expectation psychology — is the fastest but also the most unstable. If the supply plan does not materialize or schedules are delayed, the front-loaded decline expectation reverses. Past cases in Seoul where large-scale supply plans were announced and then partially delayed support this point. Conversely, the relocation demand generated during the redevelopment/reconstruction groundbreaking process can temporarily lift jeonse prices. In areas with high development density like Yongsan, this counter-effect may be concentrated.
A supply announcement reaches market psychology instantly, but what actually changes jeonse prices is ultimately the number of units a tenant can realistically choose from.
Signals the Transaction Decline Sends to the Jeonse Market
Equally important to the supply side is the change on the demand side. Yonhap News reported that following the capital gains surcharge (yangdo-se jungkwa) that took effect on May 10, Seoul apartment transactions in June fell sharply and wait-and-see sentiment deepened. Wait-and-see in the resale market has the effect of transferring demand to the jeonse market. When end-buyers who were considering a purchase defer, they opt for jeonse instead — jeonse demand rises and downward price pressure weakens.
The capital gains surcharge also operates in another direction. If sellers choose to hold with a sitting jeonse tenant rather than sell — because fewer listings means staying leased — jeonse supply is actually maintained in the market. However, if landlords instead convert jeonse to monthly rent (wolse) or raise the deposit, the situation changes. The outcome depends on the rate environment and landlords' fund management strategies.
Three forces are acting simultaneously. (1) Decline expectation from the large-scale supply announcement; (2) short-term upward pressure from relocation demand accompanying reconstruction/redevelopment; (3) jeonse demand inflow from resale market wait-and-see. The resultant of these three forces will determine the direction of jeonse prices going forward. Looking at any one in isolation risks getting the judgment wrong.
Things to Verify
- Check the redevelopment/reconstruction project stage for the area of interest — track in real time how the number of nearby jeonse listings changes before and after relocation begins (post-management-and-disposition approval, pre-groundbreaking).
- Check in Seoul's housing supply roadmap how the planned annual move-in volumes are distributed year by year — the annual distribution matters more than the total for the jeonse market.
- Identify the list of redevelopment projects scheduled to break ground in the Yongsan living zone and their expected relocation completion dates — jeonse prices in the vicinity may temporarily rise during periods when relocation demand concentrates.
- If your current lease expires between 2027 and 2028, verify how much planned move-in volume exists in your desired area and unit size range for that period.
- Check the monthly trend of transaction volumes in the area after the capital gains surcharge took effect in the Ministry of Land's real transaction price system to gauge the speed at which purchase wait-and-see converts to jeonse demand.