South Korea Infrastructure Construction - Market Share Analysis, Industry Trends & Statistics, Growth Forecasts (2026-2031)

The south korea infrastructure construction market size is projected to expand from USD 58.12 billion in 2025 and USD 60.55 billion in 2026 to USD 74.31 billion by 2031, registering a CAGR of 4.81% between 2026 to 2031. This report is Segmented by Infrastructure Segment (Transportation Infrastructure, Utilities Infrastructure, Social Infrastructure, Extraction Infrastructure), by Construction Type (New Construction and Renovation), by Investment Source (Public and Private), and by Key Cities (Seoul, Busan, Daegu, Incheon, Rest of South Korea). The Market Forecasts are Provided in Terms of Value (USD).

South Korea Infrastructure Construction Market Trends and Insights

Expansion of Rail and Metro Networks

The initial GTX A, B, and C lines are slated to serve 1.2 million daily riders by 2028, trimming many commutes by up to 40 minutes and relieving congestion on the Seoul Metro. GTX-A began service in 2024; lines B and C reached 68% and 52% completion by January 2026, led by Samsung C&T and Hyundai E&C. New feasibility work for GTX-D, E, and F, approved in December 2025, adds a USD 13.5 billion through 2035. KTX extensions to Gangneung and Sokcho, completed in 2024, boosted demand for east-coast tourism construction by USD 1.05 billion in 2025. Busan’s Metro Line 5 link to Gimhae Airport, due in 2027, underpins cargo and passenger integration.

Nation-Wide Smart-City and Urban-Redevelopment Programs

The K-City Network links 18 Seoul districts to a single data backbone that optimizes traffic, lighting, and waste services in real time, lowering municipal operating costs by 11% in 2025.

Busan’s Eco Delta Smart City mirrors the model with 8,400 sensor-equipped homes that cut energy use by 22% relative to standard apartments. The Ministry of Land, Infrastructure and Transport (MOLIT) earmarked USD 638 million in 2025 for retrofitting 120 neighborhoods, with a focus on seismic resilience and rooftop solar. Contractors such as GS E&C and DL E&C lock in multi-year facility-management fees, smoothing revenue between megaproject tenders. Sejong’s autonomous-shuttle corridor, opened in February 2025, demonstrates how new rights-of-way can be future-proofed for Level-4 vehicles from the outset.

Ageing Workforce and Craft-Skill Shortages

Statistics Korea reported that 48% of construction workers were 55 or older in 2025, up from 42% in 2020, while entrants under 30 accounted for only 9%.

The Korea Construction Association warns that 87,000 welders, carpenters, and crane operators will retire between 2026 and 2030, far outstripping the number of graduates from vocational schools. Although E-9 visas for overseas labor increased by 15,000 slots in 2025, language and safety certification hurdles blunt productivity gains. Contractors respond with prefabrication; Lotte E&C’s Asan plant cuts on-site labor hours by 30% through modular bathroom pods and facade panels. A reskilling program launched in February 2025 aims to transition 5,000 senior workers into BIM coordination and drone operation roles by 2027.

Other drivers and restraints analyzed in the detailed report include:

• Government Push for Green and Resilient Infrastructure
• Technology Integration (BIM, Drones, IoT, AI) in Construction
• Fiscal-Budget and Public-Debt Ceilings

Segment Analysis

Transportation infrastructure accounted for 39.2% of 2025 spending, the largest slice of the South Korea infrastructure construction market, and it is projected to advance at a 5.13% CAGR to 2031 as GTX extensions and KTX upgrades move ahead. Government funding of USD 13.5 billion for the three new GTX corridors, together with Busan’s Metro Line 5 and multiple KTX branch lines, locks in a multi-year backlog for tier-1 contractors with tunnel-boring and electrification expertise. Utilities work follows, buoyed by USD 465 million of 2025 wastewater-plant retrofits that drive membrane-bioreactor demand and open design slots for mid-tier civil firms. Social assets such as regional hospitals and schools absorb demographic pressure; fourteen new medical centers approved in 2025 alone will lift healthcare square footage by 1.3 million m² by 2028.

The fastest future growth appears in extraction infrastructure, where domestic lithium and cobalt deposits in Gangwon are under review, while seismic retrofits mandated for pre-2000 public buildings add a fresh USD 3.15 billion renovation stream through 2030. Contractors exploit prefabricated shear-wall modules that cut installation times by 40%, an efficiency gain that offsets labor shortages.

Complete Report Scope:

• By Infrastructure Segment
  • Transportation Infrastructure
  • Utilities Infrastructure
  • Social Infrastructure
  • Extraction Infrastructure
• By Construction Type
  • New Construction
  • Renovation
• By Investment Source
  • Public
  • Private
• By Key Cities
  • Seoul
  • Busan
  • Daegu
  • Incheon
  • Rest of South Korea

List of Companies Covered in this Report:

• Samsung C&T Corporation
• Hyundai E&C
• GS E&C Corp.
• DL E&C
• Daewoo Engineering & Construction
• POSCO E&C
• Lotte Engineering & Construction
• HDC Hyundai Development
• Hoban Construction
• Hanwha Engineering & Construction
• SK ecoplant
• Ssangyong E&C
• Kumho E&C
• Kolon Global
• Tongyang Inc.
• Kyeryong Construction
• Doosan Enerbility
• HanmiGlobal
• Hanshin E&C
• DB E&C

Additional Benefits:

• The market estimate (ME) sheet in Excel format
• 3 months of analyst support