THAILANDSICThailand Standard Industrial Classification

TSIC Activity

42101

Construction of streets, roads, bridges or tunnels

ประกอบกิจการ ให้บริการรับจ้างขุดลอกคูคลอง งานกำจัดวัชพืชทั้งทางน้ำและทางบก งานซ่อมแซมถนน งานวางท่อระบายน้ำ และ งานก่อสร้างและ ซ่อมแซม ทุกชนิด ทุกประเภท

What this activity covers

Companies in this sector construct roads, bridges, tunnels, and related infrastructure.

  • Road construction — Building and surfacing roads and highways
  • Bridge construction — Constructing various types of bridges
  • Tunnel construction — Boring and building tunnels, including subways
  • Asphalting — Applying asphalt to roads and surfaces
  • Road marking — Painting road markings for traffic guidance
  • Pedestrian walkways — Constructing walkways for pedestrians

What companies here also do

Seen in real company registrations under this code — beyond the official definition, so licensing may differ.

  • Concrete production — Operating plants for asphalt and concrete
  • General contracting — Providing broad construction services

Not included here

  • Installation of street lighting and signal systems. See activity 43210.
  • Architectural and engineering activities, see subgroup 7110
  • Project management work related to civil engineering. See activity 71102.

Foreign ownership

List 3: Restricted, FBL/BOI route availableinherited from 42

Construction, except construction of infrastructure providing basic public services in public utilities or transport that requires special apparatus, machinery, technology or expertise, and except other categories prescribed in ministerial regulations

The infrastructure carve-out is subject to a minimum foreign capital requirement, subject to capital thresholds, verify current figures.

FBA B.E. 2542, List 3 (10)Routes: Foreign Business Licence, BOI promotion, US Treaty of Amity

Auto-mapped, verify against the Act. These TSIC mappings are indicative, not legal advice; the schedules of the Foreign Business Act B.E. 2542 are the authority. See the full foreign ownership reference.

Industry at a glance

as of 23 ก.ค. 69

The whole registered industry under this activity, every registration year, from the DBD DataWarehouse.

3,553
active companies operate here
฿79.1Bregistered capital, combined
฿230.9B
Sector revenue · 2025
+11% since 2023
฿9.0B
Net profit · 2025
1,639 profitable
202320242025

net profitrevenue

Foreign investment

new registrations · 2026 YTD
0%of new registered capital is foreign-held
฿2.0M foreign฿502.6M Thai

Almost entirely Thai-held — little foreign capital enters here.

New in 2026

287+386.4%

registrations, YTD

Registered capital

฿79.1B+6.5%

since year-end

Largest by registered capital

  1. 1Asia Era One Co., Ltd.Bangkok฿7.8B
  2. 2Thanomwong Service Co., Ltd.Bangkok฿2.5B
  3. 3Ch. Karnchang Public Company LimitedBangkok฿1.7B

Source: Department of Business Development DataWarehouse. Financial figures are combined totals of companies that filed statements; revenue and profit shown for the latest three reporting years.

Companies registered since 2022

Browse all

New DBD registrations under this activity since 2022, the period the registry snapshot covers, not the full historical register.

760
Registered
since 2022
716
Still active
44
Dissolved
฿1.0M
Median capital
of active

New registrations per year

2022peak 207 in 20262026

Largest active companies by registered capital

Source: Department of Business Development (DBD) new-registration records, 2022 to present. Counts cover companies first registered in that window, reflect the latest snapshot load, and may lag the live register.

Emerhub

Restricted activity? There is usually a route.

Emerhub structures foreign-owned companies around FBA restrictions: Foreign Business Licence applications, BOI promotion, and compliant shareholding structures. Talk through your case before you commit to one.

Talk to Emerhub Thailand