CH. Karnchang

CH. Karnchang Public Company Limited, commonly known as CH. Karnchang or CK, is a Thai construction and engineering company headquartered in Bangkok. Founded in 1972 by Plew Trivisvavet and his four brothers, it developed into one of Thailand's largest contractors and is associated with major public infrastructure projects in Thailand and Laos. Its work covers civil construction and engineering for transport systems, roads, bridges, railways, water infrastructure, and other large public works. A significant part of the company's profile comes from Bangkok's expanding rail-transit network. CH. Karnchang has participated in the construction of several Bangkok metro lines and related civil works, giving it a prominent role in the development of urban transportation infrastructure. In 2024, the company was awarded the tender for design and civil works for the western extension of Bangkok's MRT Orange Line, extending its involvement in the capital's mass-transit system. The group also has an energy and infrastructure connection through CK Power Public Company Limited, its power-generation subsidiary. CK Power develops and operates power projects, including renewable-energy assets. Projects associated with the subsidiary include hydropower facilities in Laos, such as the Nam Ngum 2 Hydroelectric Power Plant and the Xayaburi Dam on the Mekong River. This relationship broadens the group beyond conventional contracting into infrastructure investment, project development, and power generation. CH. Karnchang operates primarily in Thailand and Laos. Its business model combines construction contracting with participation in infrastructure and energy projects through related companies. The company is publicly listed on the Stock Exchange of Thailand under the symbol CK. Supamas Trivisvavet became president and chief executive officer in 2015. Public reference material identifies CH. Karnchang as the second-largest construction firm in Thailand, although rankings can vary according to the measurement period and criteria used.

CH. Karnchang was established in Bangkok in 1972 by Plew Trivisvavet and his four brothers. The company entered the Thai construction and engineering sector at a time when urbanization, public investment, and national infrastructure development were creating demand for large contractors capable of delivering complex civil works. Over time, it expanded from a construction business into a broader infrastructure group with exposure to transport, water, and energy projects. The company became particularly visible through its participation in Bangkok's rail-transit development. Its construction portfolio has included civil works for various metro lines in the capital. These projects required capabilities in large-scale excavation, structural construction, stations, tunnels, systems interfaces, and coordination with public authorities and other contractors. The rail portfolio helped establish CH. Karnchang as a significant participant in Thailand's modern urban-infrastructure build-out. CH. Karnchang's activities also extended beyond Thailand. The company operates in Thailand and Laos, where its wider group has been connected with major hydropower developments. CK Power Public Company Limited, described as CH. Karnchang's power-generation subsidiary, constructs and operates renewable-energy projects. Its associated Lao projects include the Nam Ngum 2 Hydroelectric Power Plant and the Xayaburi Dam on the Mekong River. These projects illustrate the group's movement from traditional contracting toward integrated infrastructure development and power generation. The company is publicly listed on the Stock Exchange of Thailand under the ticker CK. Its corporate structure links construction expertise with infrastructure and energy interests, allowing the group to participate in projects through both contracting and affiliated operating companies. In 2015, Supamas Trivisvavet became president and chief executive officer. The company is described in reference material as Thailand's second-largest construction firm, a designation that reflects its scale within the national contracting market but may depend on the ranking methodology and reporting period. In 2024, CH. Karnchang secured the tender for design and civil works for the western extension of Bangkok's MRT Orange Line. This award reinforced its continuing role in the country's mass-transit program and demonstrated the strategic importance of rail and public infrastructure to its business. The available reference material does not provide a complete account of all subsidiaries, financial results, contract values, historical projects, or current executive changes, so those areas require additional primary-source verification.

• 2024

  MRT Orange Line western extension tender

  [1]CH. Karnchangen.wikipedia.org

  CH. Karnchang was awarded the tender for design and civil works for the western extension of Bangkok's MRT Orange Line.

• 2015

  Supamas Trivisvavet became president and CEO

  [1]CH. Karnchangen.wikipedia.org

  Supamas Trivisvavet assumed the roles of president and chief executive officer.

• 1972

  Company founded in Bangkok

  [1]CH. Karnchangen.wikipedia.org

  Plew Trivisvavet and his four brothers founded the construction and engineering company in Bangkok.

A major Thai infrastructure contractor and engineering group specializing in complex public works, urban rail systems, water infrastructure, and related energy projects.

• Urban rail infrastructure

  Bangkok rail-transit construction

  CH. Karnchang has constructed civil works for various metro lines in Bangkok. Its involvement places the company in the delivery of major urban transportation infrastructure, including the structural and civil components required for stations, alignments, tunnels, and related rail works. The available source material does not identify every line or contract scope.

• Urban rail infrastructure · 2024

  MRT Orange Line western extension

  The western extension of Bangkok's MRT Orange Line is a major rail-transit civil-works project. In 2024, CH. Karnchang was awarded the tender covering design and civil works. The project represents the company's continuing participation in the expansion of Bangkok's mass-transit network.

• Hydropower infrastructure

  Nam Ngum 2 Hydroelectric Power Plant

  Nam Ngum 2 is a hydropower project in Laos associated with CK Power, CH. Karnchang's power-generation subsidiary. It reflects the group's participation in cross-border renewable-energy infrastructure and in the development and operation of large-scale power assets.

• Hydropower infrastructure

  Xayaburi Dam

  The Xayaburi Dam is a hydropower project on the Mekong River in Laos associated with CK Power. The project forms part of the group's regional energy and infrastructure activities and demonstrates its involvement in major water and power developments beyond Thailand.

• 2024

  Pursuit of MRT Orange Line western extension contractOther

  Background

  Bangkok's mass-transit expansion created demand for major design and civil-works contractors for the western extension of the MRT Orange Line.

  Action taken

  CH. Karnchang won the tender to provide design and civil works for the western extension.

  Aftermath

  The award strengthened the company's position in Bangkok rail infrastructure and added a new major project to its urban-transit portfolio.

  Source

• 2024

  CH. Karnchang awarded design and civil-works tender for MRT Orange Line western extension[1]CH. Karnchangen.wikipedia.org

  Product launch · Other

  CH. Karnchang was awarded the tender to undertake design and civil works for the western extension of Bangkok's MRT Orange Line, adding another major rail-transit project to its Bangkok infrastructure portfolio.

1. 1CH. Karnchangen.wikipedia.org
2. 2CH. Karnchang official websitechkarnchang.co.th