Yonge North Subway Tunnel Launch Shaft Complete, TBM Work Begins
Excavation of the tunnel launch shaft for the Yonge North Subway Extension is complete, Daily Commercial News reports, marking a shift into active tunneling for the $1.44 billion advance tunnel project.
Market Impact
Crews removed nearly 70,000 cubic metres of soil to prepare the launch shaft, which extends 10 metres below ground and required 11,000 cubic metres of concrete and 860 tonnes of steel reinforcement to build, according to a government release cited by Daily Commercial News. Two tunnel boring machines will now begin digging the extension’s twin 6.3-kilometre tunnels from the site.
The Ontario government awarded North End Connectors, a team led by Aecon Infrastructure Management Inc., Fomento de Construcciones y Contratas Canada Ltd. and Ghella Canada Ltd., with design support from EXP Services Inc. and TYPSA Inc., a $1.4 billion contract in August 2025 to design and build the twin tunnels. The province has since issued a request for proposals to qualified teams for design and construction of the extension’s stations, tracks and support systems. The Government of Canada is contributing $2.24 billion to the project, which will extend TTC Line 1 nearly eight kilometres north from Finch Station into Vaughan, Markham and Richmond Hill, adding five stations: Steeles, Clark, Royal Orchard, Bridge and High Tech. The release states construction supports 4,300 jobs per year.
What It Means for Subcontractors
- Utility relocation crews have active work now: the release confirms teams are relocating utilities ahead of tunneling and station construction, a scope that typically involves electrical, gas and water line contractors working under tight sequencing with TBM launch schedules.
- Excavation support and shoring firms should note the launch shaft’s scale, 70,000 cubic metres of soil removed and 11,000 cubic metres of concrete poured, as a benchmark for the excavation-support subcontracts likely to repeat at future station sites along the eight-kilometre corridor.
- Concrete supply and steel reinforcement subcontractors can look to the 860 tonnes of reinforcement used in the launch shaft as an early indicator of material volumes needed once station construction packages go out under the newly issued RFP.
- Firms qualified for civil, structural or systems work should track the RFP for design and construction of stations, tracks and support systems, since this is the next major procurement stage following the advance tunnel award to North End Connectors.
- General contractors and trade firms in York Region and the GTA should factor the stated 4,300 jobs per year into workforce planning, as station builds at Steeles, Clark, Royal Orchard, Bridge and High Tech move from design toward construction.
