Construction Division
From curtain-wall supply on large construction sites to in-house metal window and door installation — as a licensed metal window and door contractor, we keep materials and installation within a single contract.
From supply to installation,
under one contract
We supply curtain-wall materials to large sites of major Korean construction companies, and our own installation team carries out metal window and door, curtain-wall and panel works. This page is the record of the sites JJTECH has worked on.
Curtain-wall supply covers 42 sites by weight (ton) — 구로 지스퀘어 (800 ton), 아크로 서울포레스트 (700 ton), 송도 센트로드 (603 ton) and further sites for 롯데건설 · 디엘이앤씨 · 포스코건설 · 현대건설 · 대우건설 · GS건설 · 한화건설 · 현대엔지니어링.
In-house installation is carried out under our construction business registration (Dec. 2022 — metal window and door works · roof structure assembly works · 화성22-다-16), 18 projects in total across 2023–2026. The materials that go into each site are produced in house through extrusion → coating → thermal break → machining.
- Curtain-wall material supply — standard curtain-wall bars such as mullions and transoms
- In-house installation of metal window and door, curtain-wall, panel and roofing works
- High-efficiency curtain-wall materials — U-value results for 44 curtain-wall and window models, including models with test reports on file
- Window and door drawing proposals · site surveys · punch-list touch-ups · after-sales service
From consultation to after-sales,
one company accountable at every stage
- Consultation & quoteReply within one business day
- Window & door drawingsDrawings and specifications confirmed
- ContractQuotation confirmed
- Site surveyVisit by our own installation team
- In-house productionExtrusion → coating → thermal break → machining
- In-house installationInstalled by our own team
- Punch list & after-salesAccountable to the end
Two things to prepare for a construction quote
- Drawings
- Floor plans · elevations · window and door schedules
- Bill of quantities
- Items · specifications · quantities
With both, the quote is faster and more accurate. If you do not have them, send us the site details and we will help with the take-off.
Send a construction quote request →Types of work
- Metal window & door works
- AL windows and doors · glazing · window replacement · fire doors · insect screens
- Curtain-wall works
- Curtain-wall material supply · installation
- Panel works
- External cladding panels including 고네식판넬
- Roofing works
- Roof repair · roof structure assembly
- Other · combined
- Metalwork · miscellaneous steel · façade improvement · seismic reinforcement
Transaction type — Construction: licensed metal window and door contractor, in-house installation. Manufacturing, stock-item and finished-product quotes can be selected on the Request a quote page.
High-efficiency curtain-wall materials
U-values for 44 curtain-wall and window models in one place. An in-house-designed system with a KOLAS-accredited grade-1 measured result (0.771 W/㎡K). Insulation grades are secured across the full 92–236 mm width range.
Frame width 200mm (aluminium · insulating spacer) · 43mm triple low-E glazing — 5 LE(SKN 154Ⅱ) + 14 Ar + 5 CL + 14 Ar + 5 LE(SKN 154Ⅱ), argon-filled
Test standards KS F 2278:2017 (thermal insulation) · KS F 2292:2013 (air-tightness) — Hankuk Glass Industries Technical Research Institute (KOLAS-accredited), Aug. 2019.
Models with U-value test reports
These are the representative models with accredited test reports. The originals are issued on request for quotations and submissions.
| Model | System · glazing | U-value (W/㎡K) | Grade |
|---|---|---|---|
| JJ-200PJ-01 | 200mm PJ · 43mm triple glazing | 0.771 | Grade 1 |
| JJ-120PJ-1901 | 120mm PJ · 24mm low-E argon | 1.370 | Grade 2 |
| HW150CW-CP-VENT-43LE | 150mm CP · 43mm low-E argon | 1.319 | Grade 2 |
| JJ-150PJ-02 | 150mm PJ · 24mm low-E argon | 1.348 | Grade 2 |
| HW160CW-CP-FIX-28LE | 160mm CP · 28mm low-E argon | 1.383 | Grade 2 |
| HW180CW-CP-FIX-43LE | 180mm CP · 43mm low-E argon | 1.186 | Grade 2 |
| HW180CW-CP-FIX-24LE | 180mm CP · 24mm low-E argon | 1.273 | Grade 2 |
| JJ-180PJ-1901 | 180mm PJ · 24mm low-E argon | 1.386 | Grade 2 |
When your project depends on an insulation grade — we will recommend a curtain-wall system and the test reports that match your project requirements.
Curtain-wall supply record
Large sites of major Korean construction companies — by weight (ton)
| No. | Site | Contractor | Weight (ton) |
|---|---|---|---|
| 01 | 구로 지스퀘어 | 롯데건설 | 800 |
| 02 | 아크로 서울포레스트 | 디엘이앤씨 | 700 |
| 03 | 송도 센트로드 | 포스코건설 | 603 |
| 04 | 인스파이어 리조트 | 현대건설 | 433 |
| 05 | 판교 G2 업무시설 | 디엘이앤씨 | 369 |
| 06 | 대우 월드마크 | 대우건설 | 350 |
| 07 | 에이스 하이앤드 | 에이스건설 | 350 |
| 08 | 포스코 송도사옥 | 포스코건설 | 347 |
| 09 | 서면 센트럴스타 | 포스코건설 | 344 |
| 10 | 송도 포스코 D3·D4블럭 | 포스코건설 | 307 |
| 11 | 아산배방 한화포레나 천안아산역 생활숙박시설 | 한화건설 | 290 |
| 12 | 마곡 MICE | 신동아건설 | 280 |
| 13 | 고양 향동 DMC 시티워크 지식산업센터 | 대우건설 | 274 |
| 14 | 울산 파크폴리스 | 코오롱건설 | 266 |
| 15 | 남천 엑슬루타워 | 풍림산업 | 255 |
| 16 | 부산 오시리아 메디타운 | 한화건설 | 250 |
| 17 | 대륭 포스트타워 | 대륭건설 | 246 |
| 18 | 가산동 아스크타워 | 대우건설 | 243 |
| 19 | 과천 스마트케이 업무시설 | 현대엔지니어링 | 230 |
| 20 | 송도 하버뷰 | 대우건설 | 213 |
| 21 | 용인 서천 지식산업센터 | 현대엔지니어링 | 200 |
| No. | Site | Contractor | Weight (ton) |
|---|---|---|---|
| 22 | 인천 송도 B5 | 포스코건설 | 195 |
| 23 | 속초 반얀트리 | 현대건설 | 181 |
| 24 | 호반 시흥배곧 상업시설 | 호반건설 | 180 |
| 25 | 경방 K-PROJECT | GS건설 | 178 |
| 26 | 용인 흥덕 유타워 | 극동건설 | 168 |
| 27 | 여의도 IFC SEOUL | GS건설 · 대림산업 | 157 |
| 28 | 용현동 엑슬루타워 | 풍림산업 | 155 |
| 29 | SK케미칼 | SK건설 | 154 |
| 30 | 신문로 흥국생명 | GS건설 | 120 |
| 31 | 다산지금 한강 프리미어 갤러리 지식산업센터 | 엘티삼보 | 119 |
| 32 | 중구 쌍림동 업무시설 | 쌍용건설 | 118 |
| 33 | 백상 드림타워 | 백상건설 | 110 |
| 34 | 강남 백암빌딩 | 태영건설 | 100 |
| 35 | 부산 해운대 LCT | 포스코건설 | 100 |
| 36 | 마곡 오스템 사옥 | 대우건설 | 100 |
| 37 | BIFC | 대우건설 | 100 |
| 38 | 용호만 복합시설 | IS동서 | 100 |
| 39 | 자이S&D 천안자이타워 | GS건설 | 93 |
| 40 | 시화호 라군인테라스 | 현대건설 | 62 |
| 41 | 세종시 마크원애비뉴 | 모아건설 | 60 |
| 42 | 수원 스타필드 | 신세기건설 | 46 |
Installation record
Metal window and door, curtain-wall and panel installation — carried out in house, 18 projects in total across 2023–2026. Hospital and logistics sites are in progress in 2026.
| Period | Project | Client |
|---|---|---|
| 2026.03 ~ 2026.07 | 동탄 여울동 의료시설 금속·잡철공사In progress | 메디피아 · 베스티아건설㈜ |
| 2025.12 ~ 2026.07 | 메디피움 의료시설 신축공사 (동탄)In progress | 베스티아건설㈜ |
| 2025.12 ~ 2026.03 | 김포물류센터 리모델링 창호공사In progress | CJ대한통운 · CJ건설 |
| 2025.03 ~ 2025.08 | 평택 북부경찰서 어린이집·의료시설 AL창호·유리공사 | 평택경찰서 · 씨앤씨종합건설㈜ |
| 2024.09 ~ 2025.03 | 대경정밀 공장 창호·금속공사 | 대경정밀 · ㈜알페가건설 |
| 2024.07 ~ 2024.12 | 대치동 빌딩 창호공사 | 희은 · ㈜메타종합건설 |
| 2024.07 ~ 2024.08 | 호반써밋그랜드파크 1BL 방충망 설치공사 | 호반써밋그랜드파크 |
| 2024.02 ~ 2024.03 | A관사 등 지붕보수공사 | 육군수도군단 |
| 2023.12 ~ 2024.07 | 서정관광특구 공영주차장 고네식판넬 공사 | 경기도 · 씨앤씨종합건설㈜ |
| 2023.11 ~ 2024.08 | 정릉풍림아이원아파트 방화문 교체공사 | 입주자대표회의 |
| 2023.11 ~ 2023.12 | 보령동대동현대아파트 옥상출입문 교체공사 | 입주자대표회의 |
| 2023.10 ~ 2024.02 | 평택중 이전 신축공사 중 금속공사 | 경기도교육청 · 정아산업㈜ |
| 2023.10 ~ 2023.11 | 대치동 업무시설 보수공사 중 창호·유리공사 | 창의융합연구소㈜ |
| 2023.09 ~ 2024.07 | 서정관광특구 공영주차장 신축공사 | 경기도 · 씨앤씨종합건설㈜ |
| 2023.08 ~ 2023.09 | 교내 소방시설 종합정밀점검에 따른 보수공사 | 이화여자대학교 |
| 2023.07 ~ 2023.11 | 인천 청학초 창호교체·외벽개선 및 내진보강공사 | 인천시교육청 · ㈜연성이앤씨 |
| 2023.07 ~ 2023.08 | 양평 숙박업소 신축공사 | ㈜윤민 |
| 2023.06 ~ 2023.07 | 도곡지구대 발코니창호 신축공사 | 서울 수서경찰서 |
Metal window and door works · roof structure assembly works (화성22-다-16)
Applications
Metal window & door works
AL windows and doors · glazing · window replacement · fire doors · insect screen installation.
Curtain-wall works
Curtain-wall material supply · in-house installation — meeting insulation-grade requirements.
Panel works
External cladding panel works including 고네식판넬 — public car parks · factories · logistics facilities.
Roofing works
Roof repair · roof structure assembly — within our registered scope of works.
Other · combined
Metalwork · miscellaneous steel · façade improvement · seismic reinforcement · fire-safety system repair.