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Excavation has been advancing at the Peter Gilgan Mississauga Hospital<\/a> site following the official ground breaking ceremony in June, 2025<\/a>, which marked the start of major construction for Ontario\u2019s largest hospital project ever. Rising at 100 Queensway West on the southwest corner of Hurontario Street and Queensway West, the project will deliver a 22-storey acute-care hospital alongside an 8-storey above-grade parking structure. The facility is being developed by Trillium Health Partners<\/a> and designed by a multi-firm team of Stantec<\/a>, <\/span>Adamson Associates Architects<\/a>, <\/span>Parkin Architects Limited<\/a>, and <\/span>Jodoin Lamarre Pratte Architectes Inc<\/a>.\u00a0<\/p>\n Concerns around cost have featured prominently in public reporting, particularly following the release of findings from Ontario\u2019s Auditor General. Media coverage has cited an all-in project cost of roughly $14 billion, a figure that reflects not only design and construction, but also financing, lifecycle maintenance, hospital outfitting, and long-term operations over 30 years, rather than construction alone, as outlined in the Auditor General\u2019s report.<\/p>\n Construction costs alone are estimated in the range of $7 billion to $8 billion, translating to a very high cost per square foot for the approximately 2.8 million ft\u00b2 facility. The Auditor General highlighted risks associated with the project\u2019s procurement model, noting that the hospital advanced with a single bidder.<\/p>\n So far, work has been limited to ground preparations. In October, 2025, as seen below, excavation was well underway, with a substantial below-grade pit carved out across the northern portion of the site. Multiple shoring rigs indicate active installation of drilled shoring. In the foreground and central staging area, stockpiled materials are organized, while dump trucks and excavators circulate through the site. To the south, a portion of the former surface parking lot remains temporarily intact, accommodating site trailers and parked vehicles.<\/p>\n At grade, looking north, perimeter shoring is visible in the form of regularly spaced steel soldier piles installed along the excavation edge. These vertical members have been drilled into pre-bored shafts rather than driven, to limit vibration impacts on nearby buildings and ongoing operations at the existing hospital, just to the west. The exposed pile tops, marked for identification and alignment, define the retained excavation line that will later receive lagging.\u00a0<\/p>\n This November, 2025 image captures temporary road realignments and access reconfiguration adjacent to the existing hospital buildings. Newly paved internal roadways, fresh curb lines, and marked drop-off and service zones are nearing completion, enabling the opening of replacement routes so existing roads can be closed and absorbed into the expanding construction zone. Temporary fencing, jersey barriers, and controlled pedestrian corridors separate live hospital operations from active work areas.<\/p>\n This comprehensive drone shot in December, 2025 shows the excavation progress across the full site, with Mississauga City Centre’s skyline seen on the distant horizon to the northwest. Temporary dirt paths slope into the pit from both the north and south ends. Multiple excavators are seen across the centre of the site. Along the perimeter, orange tarp lines the shoring system, with segmented retention elements particularly visible along the west edge, while the southeast corner at grade remains active with staged materials.<\/p>\n A few days later, this closer view shows the broad earthen ramp descending from grade at the north end. At grade, we see smaller blue tracked excavators, while larger green and yellow excavators are seen in the pit. Along the right-hand perimeter, a clearly defined row of tiebacks anchors the shoring system.<\/p>\n Excavation currently continues across most of the site for the two underground levels. A newly opened internal driveway and drop-off area is now in service, allowing the closure of the former access road to accommodate continued construction of the new hospital. In the southwest corner at grade, we see concrete barriers, staged materials, and temporary site infrastructure.<\/p>\n Once complete, the new hospital will deliver more than 950 beds.<\/p>\n UrbanToronto will continue to follow progress on this development, but in the meantime, you can learn more about it from our Database file, linked below. If you’d like, you can join in on the conversation in the associated Project Forum thread or leave a comment in the space provided on this page.<\/p>\n * * *<\/p>\n UrbanToronto’s research and data service,\u00a0UTPro<\/a>, provides comprehensive data on construction projects in the Greater Golden Horseshoe\u2014from proposal through to completion. Other services include\u00a0Instant Reports<\/a>, downloadable snapshots based on location, and a daily subscription newsletter,\u00a0New Development Insider<\/a>, that tracks projects from initial application.\u200b<\/p>\n <\/imgx><\/imgx><\/imgx><\/imgx><\/imgx><\/imgx><\/imgx><\/div>\n