When Does a Housing Lease Become Effective Against Third Parties, and How Is That Protection Maintained?

Based on 214 consultation cases · Updated October 4, 2026 · Translated from the Korean original.

A housing tenant may assert the lease against third parties starting the day after taking delivery of the home and completing resident registration. However, the registered address must identify the leased home, and the scope of protection may vary if the requirements for enforceability are interrupted or if senior rights or other interests are extinguished in an auction.

Tenant and other parties → Tenant → Landlord → Third party or auction purchaser → Tenant moves into a leased home and files a move-in report → Have delivery and resident registration both been completed? → Yes — Housing Lease Protection Act Article 3(1) → Can others identify the leased home from the registration? → No → Protection has not yet arisen or may be limited → Yes → Has protection been interrupted or extinguished in an auction? → Lease is enforceable against third parties from the day after both requirements are met → Yes — Housing Lease Protection Act Article 3-5 → Check the address and unit details → Registration must identify the home Building and unit details generally matter for apartment-style housing → Check for a registration change → If the whole family moves registration, protection may end; re-registration starts protection anew → Check senior rights and auction resu…

Key points

Enforceability against third parties arises on the day after both delivery of the home and resident registration have been completed. Resident registration is deemed complete when the move-in report is filed (Housing Lease Protection Act, Article 3(1) (주택임대차보호법 제3조 제1항), Cases 1 and 6).
Resident registration must serve as a means of public notice by which third parties can identify the leased home and the existence of the leasehold right. For multi-unit buildings and other apartment-style housing, the building and unit numbers must generally be stated accurately (Enforcement Decree of the Resident Registration Act, Article 9 (주민등록법 시행령 제9조), Cases 18 and 19).
For a detached house used as a multi-household dwelling, resident registration may be valid even without a unit number if the lot number is stated accurately. The determination may vary depending on the type of building and the circumstances shown in the building register, land register, and other records (Cases 4 and 6).
If the entire family transfers its resident registration to another address, existing enforceability may be extinguished. Even if they register again at the leased home, enforceability arises anew only from the date of the new registration (Case 21).
If the tenant subleases the home with the landlord’s consent and the subtenant takes delivery of the home and completes resident registration, the requirements for enforceability may remain satisfied through the tenant’s indirect possession, even if the tenant does not live there personally. Even without consent, the matter may be viewed differently if special circumstances show that the sublease did not constitute an act of betrayal toward the landlord (Cases 9 and 15).
Foreign registration or a report of change of place of stay, or a domestic residence report or report of change of domestic residence by an overseas Korean, may have the same legal effect as resident registration if the statutory requirements described in the cases are met. A report made by a cohabiting family member, rather than the tenant, may also be at issue (Immigration Control Act, Article 88-2 (출입국관리법 제88조의2); Act on the Immigration and Legal Status of Overseas Koreans, Article 10 (재외동포법 제10조); Cases 13 and 14).
In an auction, enforceability alone does not always allow the tenant to assert the lease against the purchaser. The leasehold right may be extinguished depending on senior rights and the auction outcome. A tenant with both enforceability and a preferential right to payment may, in some cases, assert the lease against the purchaser for the remaining deposit after deducting the amount the tenant could have received from the distribution (Housing Lease Protection Act, Article 3-5 (주택임대차보호법 제3조의5), Cases 1, 3, and 11).

Frequently asked questions

Q. When does enforceability against third parties arise if I have filed a move-in report and moved in?

You may assert the lease against third parties starting the day after taking delivery of the home and completing resident registration. Resident registration is deemed complete when the move-in report is filed (Housing Lease Protection Act, Article 3(1) (주택임대차보호법 제3조 제1항)).

Case 1, Case 6, Case 18

Q. Will I lose enforceability if I leave out the building or unit number when filing a move-in report for a multi-unit building?

Under the rule described in the cases, the building and unit numbers must be specified for a multi-unit building or other apartment-style housing. Resident registration stating only the lot number may not allow third parties to identify the tenant of a particular unit. However, it is necessary to examine the specific circumstances to determine whether the leased home can be identified by considering the building description and resident registration together (Cases 17 and 18).

Case 17, Case 18

Q. Can I still be protected if I enter the wrong unit number when filing a move-in report for a multi-household dwelling?

For a detached house used as a multi-household dwelling that is not separately registered by unit, resident registration may be valid if the lot number is accurate, even if the floor or unit number commonly used for convenience is incorrect. The determination may vary depending on whether the building is a multi-household dwelling or apartment-style housing and on how it is recorded in the separate registration and building register (Cases 4 and 6).

Case 4, Case 6

Q. If I temporarily transfer my resident registration elsewhere and then register again at the home, does my existing enforceability continue?

If the entire family transfers its resident registration elsewhere, existing enforceability may be extinguished at the time of the transfer. The cases explain that registering again does not retroactively restore the former enforceability; instead, new enforceability arises from the date of the new registration (Case 21).

Case 21

Q. Is enforceability maintained if the tenant moves out and a subtenant lives in the home?

If the tenant lawfully subleases the home with the landlord’s consent and the subtenant takes delivery of the home and completes resident registration, the requirements for enforceability may be satisfied even where the tenant retains indirect possession. If the landlord did not consent, the issue may be whether special circumstances show that the sublease did not constitute an act of betrayal toward the landlord (Cases 9 and 15).

Case 9, Case 15

Q. Can I assert the lease against an auction purchaser if the lease agreement has no fixed date?

If the requirements for enforceability have been met and there is no right that takes priority and remains in effect, the tenant may in some cases assert enforceability even without a fixed date. However, without a fixed date, the tenant cannot claim the preferential right to payment that depends on having one. Whether the leasehold right remains in effect after an auction must also be considered in light of senior rights, the distribution of proceeds, and other matters (Cases 1 and 11).

Case 1, Case 11

Q. If I receive only part of my deposit through the auction distribution, can I claim the rest from the purchaser?

According to the precedent described in the cases, when a tenant with both enforceability and a preferential right to payment does not receive the full deposit through the distribution, the tenant may assert the lease against the purchaser for the balance after deducting the amount the tenant could have received under the correct order of priority. If the actual distribution was calculated incorrectly, the relevant amount may be the amount payable under the correct priority order, rather than the amount actually received (Cases 1, 3, and 24).

Case 1, Case 3, Case 24

Q. Can foreign nationals and overseas Koreans also obtain enforceability for a housing lease?

Foreign registration or a report of change of place of stay under the Immigration Control Act, and a domestic residence report or report of change of domestic residence under the Act on the Immigration and Legal Status of Overseas Koreans, may have the same legal effect as resident registration, as described in the cases. Whether a report made by a cohabiting family member of a Korean national residing abroad who is the tenant satisfies the requirements for enforceability must be determined by examining the applicable laws described in the cases, the family relationship, and the specific circumstances (Cases 13 and 14).

Case 13, Case 14

Relevant laws

Housing Lease Protection Act, Article 3(1) (주택임대차보호법 제3조 제1항)
Housing Lease Protection Act, Article 3(2), (3), and (4) (주택임대차보호법 제3조 제2항·제3항·제4항)
Housing Lease Protection Act, Article 3-2 (주택임대차보호법 제3조의2)
Housing Lease Protection Act, Article 3-3 (주택임대차보호법 제3조의3)
Housing Lease Protection Act, Article 3-5 (주택임대차보호법 제3조의5)
Housing Lease Protection Act, Article 4(2) (주택임대차보호법 제4조 제2항)
Housing Lease Protection Act, Article 8 (주택임대차보호법 제8조)
Housing Lease Protection Act, Article 12 (주택임대차보호법 제12조)
Enforcement Decree of the Resident Registration Act, Article 9 (주민등록법 시행령 제9조)
Immigration Control Act, Articles 31, 32, 36, and 88-2 (출입국관리법 제31조·제32조·제36조·제88조의2)
Act on the Immigration and Legal Status of Overseas Koreans, Article 10 (재외동포의 출입국과 법적 지위에 관한 법률 제10조)
Civil Act, Articles 365, 366, 575, 578, and 629 (민법 제365조·제366조·제575조·제578조·제629조)
Civil Execution Act, Articles 88, 91, 127, and 135 (민사집행법 제88조·제91조·제127조·제135조)
Act on the Registration of Real Estate under Actual Titleholder’s Name, Articles 4 and 8 (부동산 실권리자명의 등기에 관한 법률 제4조·제8조)
Act on Security for Provisional Registration, etc., Articles 2, 3, 4, 5, and 12 (가등기담보 등에 관한 법률 제2조·제3조·제4조·제5조·제12조)

Watch out for

Enforceability does not arise from moving in or resident registration alone; both requirements must be met, and enforceability arises starting the following day.
If the address does not identify the leased home, or if resident registration is transferred elsewhere, enforceability may not be recognized or existing enforceability may be interrupted. Confirm the building and unit numbers and the actual address for apartment-style housing.
Whether enforceability and the preferential right to payment remain in effect in an auction, and the amount of any remaining deposit, may depend on senior rights, distribution priority, filing a claim for distribution, and whether delivery of the home and resident registration have been maintained.
The cases refer both to provisions as numbered before amendments and to current provisions. For an actual matter, check the laws applicable at the relevant time and the specific facts.

The Address Trap: Why Skipping 'Unit Numbers' in a Detached House Could Cost Your Deposit

Source cases

This guide was compiled by AI from the following Korea Legal Aid Corporation consultation cases (in Korean).

This guide is general legal information about Korean law, not legal advice for your situation. For a specific case, consult a lawyer or the Korea Legal Aid Corporation (call 132 in Korea).