40 Largest construction companies in Canada

Canada’s construction sector is one of the country’s largest employers and a major share of national GDP, and the firms at the top of it build at a scale that reaches from coast to coast — transit lines and airports, hospitals and hydro projects, LNG terminals and data centres. The companies behind that work range from global engineering-and-construction groups operating Canadian arms to employee-owned builders that have worked in the country for a century.

This post ranks the largest construction companies in Canada by their 2024 revenue, as reported in On-Site Magazine’s Top Contractors survey (2025 edition) — the industry’s annual accounting of the country’s biggest contractors, and its most recent edition. Every revenue figure and rank below comes from that list; profile facts and projects are sourced to each company throughout.

The top construction companies in Canada

Here are the 20 largest contractors in Canada on On-Site’s 2025 Top Contractors list, ranked by 2024 revenue in Canadian dollars.

Source: On-Site Top Contractors, 2025 edition (2024 revenue, CAD).

PCL Construction

Headquarters: Edmonton, Alberta 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $11,300.0 million — rank #1

PCL is one of the largest general contracting organizations in North America, founded in 1906 by Ernest E. Poole and 100% employee-owned. The company operates as a family of independent construction companies across Canada, the United States, Australia, and the Caribbean, and employs more than 5,500 people. It leads Canada’s ranking by a wide margin — more than $3 billion ahead of the second-largest contractor — and its 2024 revenue climbed roughly $1.3 billion year over year to $11.3 billion.

PCL’s services include:

• general contracting
• construction management
• design-build
• integrated project delivery
• offsite manufacturing and solar construction

The company has extensive experience servicing the following sectors:

• commercial, institutional, and healthcare buildings
• civil infrastructure, transit, and airports
• heavy industrial and energy
• water and wastewater
• renewable energy and solar

PCL’s recent Canadian work spans landmark buildings and public infrastructure. The firm delivered the Rogers Centre outfield-district renovation for the Toronto Blue Jays, and its mass-timber, net-zero Limberlost Place at George Brown College was named ENR’s Global Best Project of the Year. PCL also completed the new Western Memorial Regional Hospital in Corner Brook, Newfoundland.

EllisDon

Headquarters: Mississauga, Ontario 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $8,100.0 million — rank #2

EllisDon is an employee-owned construction services and technology company founded in 1951 by brothers David and Don Smith — the name combines David Ellis Smith and Don Smith. Today it employs more than 10,000 people and works across Canada and internationally, delivering projects on a cradle-to-grave model that runs from financing through construction, operations, and maintenance. Its 2024 revenue rose to $8.1 billion, holding second place behind PCL.

EllisDon’s services include:

• general contracting and construction management
• design-build
• public-private partnerships and project financing
• civil infrastructure and digital engineering
• facilities management and building operations

The company has extensive experience servicing the following sectors:

• healthcare
• commercial, mixed-use, and residential buildings
• civil and transit infrastructure
• industrial, energy, and data centres
• cultural, education, and institutional

EllisDon’s Peter Gilgan Mississauga Hospital project was named IJGlobal’s PPP Deal of the Year, one of the largest hospital projects in Canadian history. In Calgary, the firm’s M3 tower topped out as Canada’s tallest tower outside Toronto, and its work at Toronto’s Michael Garron Hospital won the OGCA’s Ontario Builder Award.

Pomerleau

Headquarters: Montreal, Quebec (founding roots in Saint-Georges, Quebec) 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $5,261.5 million — rank #3

Pomerleau is one of Canada’s largest general contractors, founded in 1964 by Hervé Pomerleau in Saint-Georges, Quebec, and now run from Montreal with more than 5,000 employees and offices coast to coast. The company delivers building, civil, and infrastructure construction nationwide, and carries out renewable-energy work through its subsidiary Borea. Its 2024 revenue of roughly $5.3 billion moved it up to third on On-Site’s list.

Pomerleau’s services include:

• general contracting and buildings construction
• civil and infrastructure construction
• major complex projects (P3, EPC, design-build)
• specialized works — bridges, deep foundations, earthworks
• renewable-energy construction

The company has extensive experience servicing the following sectors:

• transit, rail, bridges, and highways
• water and wastewater treatment
• energy infrastructure and renewables
• ports and marine works
• institutional buildings — health, education, and culture

Pomerleau was part of the NouvLR consortium that delivered Montreal’s Réseau express métropolitain (REM), the roughly $5-billion, 67-kilometre automated light-rail network. In 2024 the firm also completed the deconstruction of Montreal’s original Champlain Bridge, reusing 96% of the recovered material and earning Envision Gold certification. Pomerleau has been named one of Canada’s Top 100 Employers.

Graham Construction

Headquarters: Calgary, Alberta 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $4,300.0 million — rank #4

Graham is one of North America’s largest construction and construction-services firms, founded in 1926 and employee-owned since the early 1980s. Run from Calgary and marking its centennial in 2026, the company works from more than 20 offices across Canada and the United States, from project inception through lifecycle management, and self-performs a large share of its civil and concrete work. Its 2024 revenue of $4.3 billion moved it up to fourth.

Graham’s services include:

• general construction services
• self-perform civil and concrete work
• pre-construction and early contractor involvement
• project financing and alternative delivery
• digital construction and real estate development

The company has extensive experience servicing the following sectors:

• infrastructure and transportation
• water and environment
• buildings — healthcare, education, and commercial
• industrial, mining, and energy
• defence and security

In July 2026 Graham was awarded the Bridgeland-Riverside Multimodal Pedestrian Bridge project in Calgary. The firm is also building the Dakota Dunes Thermal Spa, billed as Saskatchewan’s first thermal-spa destination, on Whitecap Dakota Nation lands. Graham was named one of Canada’s Best Managed Companies for a 26th consecutive year in 2026.

Aecon

Headquarters: Toronto, Ontario 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $4,243.0 million — rank #5

Aecon is a North American infrastructure development and construction company that traces its roots to 1957 and now runs its head office in Toronto. Publicly traded and active across Canada with a growing US presence, the company builds civil, nuclear, industrial, and urban-transit infrastructure, and develops and finances projects through its concessions business.

Aecon’s services include:

• general and prime contracting
• civil infrastructure construction
• nuclear construction and refurbishment
• utilities and industrial construction
• concessions — development, financing, and operation

The company has extensive experience servicing the following sectors:

• civil infrastructure
• nuclear
• industrial
• utilities
• urban transportation and transit

Aecon is part of the Bridging North America consortium building the Gordie Howe International Bridge between Windsor and Detroit, set to be the longest cable-stayed bridge in North America. The firm built the Oneida Energy Storage Project near Nanticoke, Ontario — described as the largest battery-storage facility of its kind in Canada — and is a construction partner on the Darlington New Nuclear Project, billed as North America’s first grid-scale small modular reactor.

Ledcor Group

Headquarters: Vancouver, British Columbia 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $4,000.0 million — rank #6

Ledcor is one of North America’s largest diversified construction companies, founded in 1947 by William “Bill” Lede, who started with a single bulldozer in Alberta’s Leduc oil patch. Employee-owned and run from Vancouver, the company works from roughly 20 offices across Canada and the United States, spanning building, civil, energy, mining, and telecommunications construction. At $4.0 billion in 2024 revenue it sits sixth on the current list, down from third a year earlier.

Ledcor’s services include:

• building construction
• heavy civil and infrastructure
• pipeline and energy construction
• telecommunications network build
• power, mining, and renewables services

The company has extensive experience servicing the following sectors:

• commercial, institutional, and residential buildings
• infrastructure and transportation
• oil, gas, and LNG
• mining and minerals
• communications and real estate

Ledcor’s Tank Hill project won top honours at the 2026 ACEC-BC Awards. The firm is advancing critical construction phases on the Cedar LNG project in Kitimat, British Columbia, and secured a roughly $1-billion contract for the Bowmanville GO transit extension in Ontario.

Vinci (Canada)

Headquarters: No single Canadian headquarters — operates through regional subsidiaries, chiefly Carmacks (Nisku, Alberta) and Menard (Brossard, Quebec); parent Vinci, France 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $3,450.4 million — rank #7

Vinci’s Canadian presence is the work of a French concessions-and-construction group, carried out through several regionally based subsidiaries rather than one national company. Its Canadian-operation revenue rose to about $3.45 billion in 2024, holding seventh place. The road-building network — largely the former Eurovia Canada operations, including Carmacks in Alberta — handles highways and civil infrastructure, while Menard Canada delivers ground improvement and foundation engineering from Quebec. Carmacks alone employs more than 400 people and maintains over 2,000 kilometres of highway.

Vinci’s Canadian services include:

• highway and road construction and paving
• bridge construction, repair, and maintenance
• municipal and civil infrastructure
• long-term highway maintenance
• ground improvement and foundation engineering

The company has extensive experience servicing the following sectors:

• transportation infrastructure — highways, ring roads, and rail
• aviation and airports
• commercial, industrial, and multi-residential buildings
• mining and energy infrastructure
• municipal and public works

Menard Canada’s recent ground-engineering work includes the YVR Airport Pier D expansion in Richmond, British Columbia, where stone-column densification was used to guard against seismic liquefaction, and the West Calgary Ring Road, where roughly 1,800 vertical drains were installed beneath bridge abutments on a five-kilometre freeway build. The subsidiary also delivered ground improvement for the Metro distribution centre in Terrebonne, Quebec.

Bird Construction

Headquarters: Mississauga, Ontario 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $3,397.3 million — rank #8

Bird is a Canadian-owned construction and maintenance firm founded in 1920 by Hubert J. Bird, with operations that began in Moose Jaw, Saskatchewan. Publicly traded on the TSX and employing more than 6,000 people across 18 Canadian cities, Bird works across industrial, buildings, and infrastructure markets, and expanded significantly through its merger with Stuart Olson. Its 2024 revenue of roughly $3.4 billion moved it up to eighth, one of the larger climbs in the top ten.

Bird’s services include:

• pre-construction and general contracting
• industrial construction and maintenance
• civil and structural infrastructure
• mass timber and modular construction
• BIM/VDC and sustainable construction

The company has extensive experience servicing the following sectors:

• commercial and institutional buildings
• mining and heavy industrial
• energy and renewables
• water, wastewater, and civil infrastructure
• mission-critical facilities and data centres

In July 2026 Bird announced approximately $1 billion in recent project awards and agreements across Canada. Earlier that year, Bell named Bird a construction partner for a 300-megawatt Saskatchewan AI “Fabric” data centre and announced a long-term partnership with the firm.

ACS companies (Dragados/Flatiron)

Headquarters: Operates in Canada as FlatironDragados Canada; parent ACS Group, Madrid, Spain 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $2,527.7 million — rank #9

New to the top ten this year, the “ACS companies” entry is the Canadian heavy-civil work of Spain’s ACS Group, delivered through FlatironDragados — the combined Flatiron and Dragados business brought together under ACS. In Canada the firm builds major bridges, transit, and marine infrastructure; the combined FlatironDragados business reports more than US$7 billion in annual revenue and a backlog above US$17.8 billion globally. Its Canadian-operation revenue of about $2.53 billion places it ninth on On-Site’s 2025 list.

The ACS companies’ services include:

• heavy civil construction and major-project delivery
• bridge construction, including long-span cable-stayed
• rail and transit
• tunnelling and underground works
• marine works and foundations

The company has extensive experience servicing the following sectors:

• roads and bridges
• rail and transit
• aviation
• water, wastewater, and dams
• coastal protection and resiliency

FlatironDragados is part of the Bridging North America consortium delivering the Gordie Howe International Bridge between Windsor and Detroit, completed in 2025 as one of the longest cable-stayed spans in North America. In British Columbia the firm is a joint-venture partner on the Surrey Langley SkyTrain, a 16-kilometre elevated Expo Line extension being built with Ledcor and SYSTRA, and it earlier completed the Port Mann Bridge, a 10-lane cable-stayed crossing in the Vancouver area.

Kiewit Canada

Headquarters: Calgary, Alberta (Canadian operations); parent Kiewit Corporation, Omaha, Nebraska 2024 revenue (On-Site Top Contractors, 2025 edition): CAD $1,951.7 million — rank #10

Kiewit Canada is the Canadian arm of Kiewit Corporation, an employee-owned engineering and construction group founded in Omaha in 1884 by brothers Peter and Andrew Kiewit. The Canadian operations run from offices spanning Western Canada through Ontario, Quebec, and Atlantic Canada, and self-perform most of their heavy-civil and marine work. Its Canadian-operation revenue of roughly $1.95 billion placed it tenth in 2024, down from seventh a year earlier.

Kiewit’s services include:

• self-perform construction
• engineering and construction-focused design
• integrated and design-build delivery
• heavy civil and marine construction
• fabrication and modular yard work

The company has extensive experience servicing the following sectors:

• transportation — bridges, roads, rail, and aviation
• marine
• energy and power, including hydro and LNG
• water and wastewater
• oil, gas, and chemical

Kiewit’s Highway 5 Reinstatement Project in British Columbia — rebuilding six bridge crossings lost in the 2021 floods — won the 2024 TAC Infrastructure Achievement Award. In 2025 the firm delivered the YVR North Runway Modernization Project at Vancouver International Airport, and in Ontario it built the Waaban Crossing, a 1.2-kilometre signature bridge over the Cataraqui River in Kingston.

Notable mentions

Broccolini (#14, Montreal) is a fully integrated construction, development, and property-management firm founded in 1949 by Donato Broccolini, with $864 million in 2024 revenue behind projects such as National Bank Place, the 40-storey Montreal tower completed in 2023. Broccolini plans its workforce with Bridgit — and, in its own account, uses it to forecast its teams’ bandwidth across a busy project pipeline.

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