Seoul Aparteu Remodeling — 입주자대표회의 + 전문건설업 + 공동주택관리법

Most AskBaily markets share a common shape: a homeowner owns their unit, hires a licensed contractor, pulls a permit, and starts work. Seoul runs differently in one way foreign owners and returning Korean expats get wrong with regularity. In Korea, aparteu — 아파트 — is not the low-rise walk-up an American would picture when hearing "apartment." It is the dominant housing typology: a high-rise reinforced-concrete tower, typically fifteen to thirty-plus storeys, governed by an Apartment Management Act (공동주택관리법) and overseen by a Resident Representative Council (입주자대표회의 / ipjuja-daepyo-hoeui) whose prior consent is required before you move a wall, re-route plumbing, or replace an exterior window. Sixty percent of Seoul lives in aparteu. A villa (빌라) is the low-rise walk-up; an officetel (오피스텔) is a mixed-use studio block; a detached single-family house (단독주택) is a different animal entirely.

This pillar is for the Seoul aparteu owner, the Korean expat renovating the family Gangnam unit, and the foreign investor holding Seoul property through an agent. Baily's position is narrow: one verified team holding a Korean Specialty Construction Business (전문건설업) registration matching scope, backed by a Korean-licensed electrical contractor and, where structural scope demands, a Korean-licensed architect through the Korean Institute of Architects (대한건축사협회) who can stamp drawings your 입주자대표회의 will accept on first review. Angi sends your information to twelve strangers. Baily sends it to one Korean Construction Industry-licensed (전문건설업) team that handles foreign-investor-friendly aparteu remodeling and has actually done the paperwork dance with a Seoul district office and a resident council before.

The regime is not hostile. It is unforgiving if you fail to understand which walls you own, which you merely use, and which neighbours can object before work starts.

What "aparteu" means in Korea (and what it doesn't)

아파트 is a Korean loan-adaptation of "apartment" but semantically narrower. It refers to purpose-built mid- to high-rise residential buildings — fifteen storeys is common, thirty-plus is routine in Gangnam and the satellite new towns. Developments are typically organised as an aparteu danji (아파트 단지) — a superblock of several towers sharing grounds, parking, and a management office. Samsung Raemian, Hyundai I-Park, Lotte Castle, and GS Xi are the best-known developer brands.

Do not confuse aparteu with 빌라 (low-rise walk-up), 오피스텔 (mixed-use studio), 단독주택 (detached single-family), or 주상복합 (mixed-use tower under a separate chapter). A foreign investor buying Seoul residential property is almost always buying into an aparteu unit governed by the Apartment Management Act.¹ The renovation conversation starts there.

Apartment Management Act + Resident Representative Council (입주자대표회의)

The Apartment Management Act (공동주택관리법 / Gongdong-jutaek Gwalli-beop), in its current form from 2015 and amended since, governs every aparteu of a certain size in Korea. The Act mandates that each eligible building operate a Resident Representative Council (입주자대표회의), composed of one representative per floor or unit line plus an executive chair.¹ The council manages common parts, enforces house rules, approves renovation applications, and contracts with a property management company (관리사무소). Comparable to a condo board but with broader statutory authority rooted in a single national Act.

Renovation workflow: the owner submits a written application (리모델링 공사 신청서) to the 관리사무소 with scope, drawings where required, the contractor's 전문건설업 license number, insurance certificates, proposed working hours, and the neighbour-notification plan. Depending on scope, the management office clears it on delegated authority, escalates to the Council, or — for common-parts-affecting scope — requires a formal Council vote under the Act's two-thirds threshold. A written approval letter is issued with conditions attached.

Review runs two weeks for light interior scopes, four to eight weeks for most mid-scope renovations, and longer when a Council meeting is required. Gangnam-gu and newer Songpa-gu and Mapo-gu danji run tighter processes; older buildings in Yongsan-gu and Seocho-gu often clear faster but enforce stricter working hours. A contractor without a current 전문건설업 registration is rejected on receipt.

Common parts vs exclusive parts (공용부분 vs 전유부분)

Korean condominium law makes the same distinction Japanese law makes and most American condo statutes make, but the line sits closer to the inside face of the unit than foreign owners expect.

Exclusive parts (전유부분 / jeonyu-bubun). Title extends to interior surfaces: finished wall face, upper floor finish, underside of ceiling finish, interior side of entry door, everything inboard. Interior non-loadbearing partitions, plumbing and electrical downstream of common risers, paint, flooring, and fixtures are all exclusive.

Common parts (공용부분 / gongyong-bubun). Everything else: structural concrete walls (including unit-boundary walls), floor and ceiling slabs, exterior walls, exterior windows, entry door exterior face, plumbing and electrical risers, ventilation shafts, corridors, lobbies, elevators, rooftop, building exterior. Balconies carry an exclusive-use right but are legally common parts — which is why balcony enclosure rules are heavily regulated.

The practical consequence: the wall between your bathroom and the corridor is almost certainly a common-part structural wall carrying a common-part plumbing riser. You cannot cut into it, re-route plumbing, or drill substantial anchors without prior Council consent; riser modification requires a supermajority vote. Most Seoul aparteu house rules also prohibit individual owners from replacing exterior windows — the danji performs replacement collectively on a retrofit cycle.

The subtler trap is the internal shear wall. Many Korean aparteu were designed under the wall-type reinforced-concrete system (벽식 구조), where what looks like an ordinary interior partition is in fact a load-bearing shear wall. Removing it to combine rooms is a structural modification affecting a common part even though it sits inside your unit envelope. A structural engineer reads the original 건축허가 (geonchuk heoga) drawings to classify every wall before design starts.

Construction Industry Framework Act + license classes

The contractor side is governed by the Construction Industry Framework Act (건설산업기본법), the foundational Korean construction statute.² It makes licensing mandatory for any construction work above ₩15 million and splits the industry into two main classes.

General Construction Business (종합건설업). For contractors executing large-scope integrated construction — new buildings, major reconstruction, major additions. Higher capital and bonding thresholds. A full aparteu danji is built by a General Construction Business.

Specialty Construction Business (전문건설업). For contractors executing specialty trades and interior remodeling. The Act defines twenty-eight specialty categories covering electrical, plumbing, HVAC, interior finishing, waterproofing, metalwork, and others. Most Seoul aparteu remodeling falls within Specialty Construction Business scope, with the prime contractor holding 실내건축공사업 (interior construction) and subcontractors holding trade-specific licenses.

Both license classes are issued through the Ministry of Land, Infrastructure and Transport (국토교통부) and administered provincially — for Seoul, by the Seoul Metropolitan Government construction administration office.³ Licenses are searchable on the national public registry. Baily pulls the registry record before any introduction.

For a typical Seoul aparteu remodel, your prime contractor should hold a Specialty Construction Business license with 실내건축공사업 registered. For major structural reconfiguration crossing into new construction territory, a General Construction Business license may be required instead.

Specialty Construction Business (전문건설업) requirements

Holding a 전문건설업 license is not a paperwork formality. The Act sets minimum capital (₩150M to ₩500M paid-in depending on category), technical staff (at least one senior engineer registered under the National Technical Qualifications Act), facilities, and guarantees. Violations — including subcontracting to unlicensed parties — trigger suspension or revocation.

Categories relevant to aparteu remodeling include 실내건축공사업 (interior construction, prime for most scopes), 전기공사업 (electrical, separately licensed under the Electrical Construction Business Act), 기계설비공사업 (mechanical/HVAC), 상하수도설비공사업 (water and drainage), 방수공사업 (waterproofing), 도장공사업 (painting), and 가스시설시공업 (gas installation).⁴

A common trap: Korean electrical contracting is separately licensed. A 전문건설업 license does not cover electrical work. You need a subcontractor with a 전기공사업 license for any wiring modification, and the council packet typically requires both license numbers on the face sheet. Korean licensing does not map onto Japanese 建設業法 or US state-licensed contractor status. The Korean Institute of Architects (대한건축사협회) administers the Korean architect license separately, and while architect involvement is statutorily mandatory only when scope triggers a building permit, most 입주자대표회의 require architect-stamped drawings regardless.⁵

Building Permit vs Notification — when each applies

Korean construction law distinguishes two regulatory tiers for existing buildings.

Notification (신고 / singo). A lightweight filing to the district office (구청) for minor interior work not affecting structure, envelope, plumbing risers, or common-part electrical. Paint, wallpaper, flooring, fixture and cabinet replacement, non-structural partition modification within exclusive parts — all typically clear through Notification. Review is administrative, two to four weeks.

Building Permit (건축허가 / geonchuk heoga). Required for structural modification, envelope change, plumbing riser relocation, new rooms or mezzanine, or any work triggering the Building Act's permit thresholds. Submitted to the 구청 or, for larger scopes, the 시청 (city office). Seoul aparteu applications route through the relevant ward — Gangnam-gu, Seocho-gu, Songpa-gu, Yongsan-gu, Mapo-gu, and the 22 others each run their own permit desk. Processing runs 30 to 90 days for straightforward permits, 60 to 120 days for structural scope.

The 건축허가 packet requires architect-stamped drawings under the Certified Architects Act (건축사법) and, for structural work, a structural engineer's analysis and stamp.⁵ A completion inspection (사용승인) is required before occupancy. The foreign owner's error is assuming Notification is always available; in practice, any remodel touching a structural wall, re-routing plumbing, or modifying the balcony envelope falls under Building Permit.

Sound transmission + working hours + neighbor notification cultural reality

Under the 2014 amendment to the Apartment Management Act, Korean aparteu are subject to nationally enforced floor-impact-noise standards — a direct response to a sustained wave of 층간소음 (cheunggan-soeum) disputes in Korean high-rises. Any flooring change requires an impact-sound-rated underlay system, typically T20 EPS (twenty-millimetre expanded polystyrene) or a floating-floor construction delivering an equivalent impact-noise rating.⁶ The specification is cited on the Council application; a product certificate is included in the completion handover pack.

The classic foreign-owner violation is the same as in Tokyo: rip out builder-grade flooring, install hardwood directly over the slab, and discover within weeks that the downstairs neighbour is filing formal complaints with the management office and, in the worst cases, the district 민원 (complaint) office. Remediation runs ₩5M to ₩15M for a typical 30-pyeong unit. Korean aparteu culture takes floor-noise complaints unusually seriously; this is not a soft norm.

Working hours are set by house rule, typically 09:00 to 18:00 weekdays with no work on weekends or Korean national holidays (설날, 추석, and the national public holidays). Older buildings sometimes permit Saturday morning work; newer luxury buildings restrict to 10:00 to 17:00. Buildings with a resident superintendent (경비원) enforce hours by controlling service-elevator access.

Layered on top is neighbour notification. Before construction begins, the contractor visits immediate neighbours — unit above, below, and both sides — with a written notice (공사 안내문) and a small customary gift (선물) worth ₩10,000 to ₩30,000 per household. Not a legal requirement; a strongly-enforced cultural norm. Skipping it is the fastest route to complaints, management-office escalation, and Council reconsideration of approval.

Asbestos in pre-2009 buildings

Korea enacted the Asbestos Safety Management Act (석면안전관리법) in 2011, building on earlier regulatory steps from 2009.⁷ Buildings permitted before 2009 commonly contain asbestos in fireproofing sprays, some ceiling tile products, and vinyl floor tile backings. For buildings over fifty years of age or with known asbestos-containing materials in the national registry, a pre-renovation asbestos survey (석면조사) is required before substantial demolition.

The Korean Ministry of Environment (환경부) administers the framework, with abatement by licensed specialty contractors and hazardous-waste disposal through registered handlers. Budget ₩2M to ₩15M for survey and remediation, add two to four weeks to the schedule, and do not allow demolition until the survey is in hand. A contractor suggesting the survey can be skipped is exposing you to direct liability.

Foreign owner financing reality

Korea imposes no general restriction on foreign ownership of Seoul apartments. A foreign passport holder can buy, hold, rent, and sell on the same legal footing as a Korean citizen. There is no equivalent of Singapore's ABSD or Hong Kong's BSD. Foreign Exchange Transaction Act reporting applies to incoming purchase funds — a reporting step, not a prohibition.

The constraint is financing. Domestic Korean banks (KB Kookmin, Shinhan, Hana, Woori, NH) extend mortgages to non-resident foreigners at roughly fifty percent LTV, compared to seventy percent for residents. Renovation loans (리모델링 대출) from domestic banks are generally restricted to resident Korean borrowers. Non-residents typically fund renovation from equity at closing, a home-country facility against domestic collateral, or a foreign-client desk at a specialised Korean provider. Baily does not originate financing.

Korean construction still runs with a significant cash-payment component. Paying in cash without bank transfer records and tax receipts exposes a foreign investor on tax (not deductible without the trail) and warranty (no paper enforcing contractor obligations). Bank transfer plus Korean tax receipts (세금계산서) is the only workflow Baily partners operate under.

Cost bands: ₩100K-₩2.5M per pyeong by scope + finish

Korean remodeling is quoted per 평 (pyeong ≈ 3.31 sqm). A 30-pyeong aparteu is ~99 sqm; a 50-pyeong unit is ~165 sqm. Korean contractor quotes will almost never quote in sqm.

2026 bands:

Light — ₩100,000 to ₩200,000 per pyeong. Paint, wallpaper, flooring swap with compliant underlay, fixtures, minor cabinet refresh. No structural modification. 30-pyeong unit: ₩3M to ₩6M.

Mid-range full reno — ₩300,000 to ₩600,000 per pyeong. New kitchen, bathroom with waterproofing membrane and impact-rated floor, partition modifications within exclusive parts, electrical refresh. 30-pyeong unit: ₩9M to ₩18M (~US$6,500 to US$13,000).

Premium full reno — ₩600,000 to ₩1,200,000 per pyeong. High-end kitchens (Miele, Gaggenau, Bosch), full-stone bathrooms, structural reconfiguration with Council supermajority, underfloor heating, smart-home, millwork. 50-pyeong unit: ₩30M to ₩60M (~US$22,000 to US$44,000).

Luxury Gangnam / Hannam / Yongsan trophy — ₩1,200,000 to ₩2,500,000+ per pyeong. Hannam The Hill, PH129, Trimage, Galleria Foret, The Classic 500 territory. Full interior design by a named practice, bespoke millwork, imported stone. 60-pyeong units routinely clear ₩150M.

These exclude VAT (부가가치세 / 10 percent), architect fees (5 to 12 percent), and Council-mandated bonds. Korean apartment sales also frequently exclude 빌트인 (built-in) appliances — clarify in the purchase agreement before sizing the renovation budget.

Timeline: 2 to 6 months total

Full-renovation timeline from first contractor contact to handover:

• Council rule review — 1 to 2 weeks.
• Scope definition and schematic design — 2 to 4 weeks.
• Council application and approval — 2 to 8 weeks, longer if a formal vote is needed.
• Building Permit (건축허가) where required — 30 to 120 days, paralleling Council review where scope permits.
• Asbestos survey and abatement for pre-2009 buildings — 2 to 4 weeks, can overlap.
• Pre-construction neighbour notification (선물 visit) — 1 week.
• Construction — 4 to 12 weeks. Light 4 to 6, mid-range 6 to 10, premium 10 to 16.
• Completion inspection and handover — 1 to 2 weeks.

A typical mid-range Seoul renovation clears in three to four months. Premium scope with Council vote and Building Permit runs four to six. Foreign investors targeting a spring move-in should engage design in late autumn, align with the Council meeting calendar, and budget the asbestos survey into the critical path for any pre-2009 building.

What Baily verifies before any Seoul aparteu match

Before introducing a Seoul homeowner to any contractor or design team, Baily verifies:

• Specialty Construction Business (전문건설업) license on the national registry, with categories matching scope.
• General Construction Business (종합건설업) license where scope crosses the reconstruction threshold.
• Electrical Construction Business (전기공사업) license on the prime contractor or a named subcontractor.
• Korean-licensed architect registration through the Korean Institute of Architects (대한건축사협회) when Building Permit scope requires stamped drawings.
• Workers' compensation (산재보험) and general liability insurance valid through construction dates.
• At least one prior Seoul aparteu renovation delivered in the past twenty-four months, with the 입주자대표회의 approval letter and completion certificate available on request.
• For pre-2009 buildings, asbestos survey and abatement capability.
• English-language communication capacity for non-Korean-speaking homeowners.
• Cultural fluency with the 선물 neighbour-notification workflow as a default part of the schedule.

Baily introduces one team per homeowner, matched to scope, budget, and district. The partner receives a single lead with full project context — not a broadcast enquiry shared with eleven competitors — and responds within one business day.

Frequently asked questions

Can I remove walls in my Seoul aparteu to combine rooms?

Maybe — depends on whether the wall is structural and whether it's exclusive or common property. Under the Apartment Management Act (공동주택관리법), interior partition walls in your exclusive part (전유부분) can typically be removed with prior management association notification. But many Korean aparteu walls that look like simple partitions are actually internal shear walls — load-bearing walls that contribute to the building's structural integrity. A licensed structural engineer reads the original 건축허가 (geonchuk heoga) drawings to confirm wall classification before design. The most common foreign-investor mistake is assuming "interior wall = my wall" — Korean apartment law works similarly to Japanese mansion law, not like American condos.

Do I need a 전문건설업-licensed contractor for a light renovation?

Yes for any scope above ₩15 million under the Construction Industry Framework Act. Below that threshold unlicensed crews are legally permitted for minor work, but most Seoul 입주자대표회의 reject applications from unlicensed contractors regardless of scope value, and management offices will often not issue a work permit without a licensed contractor's registration number. A typical Seoul aparteu light renovation clears ₩15 million quickly once paint, flooring, fixtures, and labour combine. Assume you need a licensed contractor with 실내건축공사업 specialty registered.

As a non-resident foreign owner, can a Korean bank finance my renovation?

Domestic Korean banks (KB, Shinhan, Hana, Woori, NH) extend mortgages to non-resident foreigners at around fifty percent LTV, lower than the seventy percent available to residents. Renovation-specific loans (리모델링 대출) are generally not available to non-residents. Most foreign-owner Seoul renovations are funded from equity at closing, through a home-country facility against domestic collateral, or through a foreign-client desk at a specialised provider. Baily does not originate financing; arrange it before you engage the design team.

My aparteu is in a 1985 building. Is it too old to renovate?

No — pre-2009 Seoul aparteu are routinely renovated. Two things to plan for. First, an asbestos pre-renovation survey is mandatory under the Asbestos Safety Management Act for buildings of that vintage; budget ₩2M to ₩15M for survey and abatement. Second, internal walls in earlier wall-type reinforced-concrete designs are more likely to be load-bearing shear walls than in newer column-and-beam buildings, constraining open-plan reconfigurations. Your architect and structural engineer classify the walls from the original 건축허가 drawings before design lines get drawn.

How long before construction should I notify my neighbours, and what should I bring?

Seven to fourteen days before start is standard. Your contractor's site supervisor typically makes the visit. Bring a written construction notice (공사 안내문) showing schedule and contact information, along with a small wrapped gift per household — ₩10,000 to ₩30,000 fruit basket, sweets set, or traditional gift set. Visit units immediately above, below, and on both sides at minimum; for larger projects, visit the full floor and the floor above. Not a legal requirement, but one of the most consequential soft-skill inputs to successful delivery. Skipping it reliably creates noise complaints and council reconsideration of your approval within the first week of work.

Sources

Footnotes

1. Apartment Management Act (공동주택관리법), Act No. 13474 of 2015 as amended. Korean Ministry of Government Legislation statute portal: https://www.law.go.kr/법령/공동주택관리법. English-language summary via the Korea Legislation Research Institute: https://elaw.klri.re.kr/eng_service/lawView.do?hseq=39023. ↩ ↩²

2. Construction Industry Framework Act (건설산업기본법), Act No. 4724 of 1996 as amended. https://www.law.go.kr/법령/건설산업기본법. Ministry of Land, Infrastructure and Transport administrative portal: https://www.molit.go.kr/. ↩

3. Ministry of Land, Infrastructure and Transport (국토교통부): https://www.molit.go.kr/english/intro.jsp. Seoul Metropolitan Government Construction Administration building-permit and licensing information: https://english.seoul.go.kr/. ↩

4. Electrical Construction Business Act (전기공사업법), Act No. 3952 of 1987 as amended. https://www.law.go.kr/법령/전기공사업법. ↩

5. Certified Architects Act (건축사법), Act No. 1536 of 1963 as amended. https://www.law.go.kr/법령/건축사법. Korean Institute of Architects (대한건축사협회 / KIRA): https://www.kira.or.kr/. ↩ ↩²

6. Floor-impact-noise regulation under amendments to the Apartment Management Act and Housing Act (주택법) implementing rules. Ministry of Land, Infrastructure and Transport summary portal: https://www.molit.go.kr/USR/policyData/m_34681/dtl.jsp. Korea Agency for Infrastructure Technology Advancement (KAIA) floor-impact standard documentation: https://www.kaia.re.kr/. ↩

7. Asbestos Safety Management Act (석면안전관리법), Act No. 10613 of 2011 as amended. https://www.law.go.kr/법령/석면안전관리법. Ministry of Environment (환경부) asbestos program: https://me.go.kr/home/web/main.do. ↩