Ontario Breaks Ground on a New Science Centre at Ontario Place After Years of Backlash

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A shovel in the ground at Ontario Place marks more than the start of construction. It turns one of Ontario’s most disputed cultural infrastructure plans from political argument into physical reality.

The province says the new Ontario Science Centre will open in 2029 as a 400,000-square-foot waterfront facility with modern exhibits, updated Ontario Place pods, and a renovated Cinesphere. Supporters frame it as a fresh start for a beloved institution. Critics see it as the latest step in a costly relocation that followed the sudden closure of the Don Mills Road site, a building many families, educators, architects, and community groups still believe could have been saved.

The Groundbreaking Turns a Long-Running Fight Into a Construction Project

Ontario’s groundbreaking at Ontario Place gives the Science Centre relocation a new level of permanence. For years, the debate centred on plans, renderings, audits, petitions, roof reports, and competing claims about cost. Now, the province is moving into the construction phase for a facility it says will anchor the wider Ontario Place redevelopment and bring science programming to Toronto’s waterfront.

The timing matters. The original Ontario Science Centre was not just another public attraction; for many Ontario families, it was a school-trip milestone, a weekend tradition, and a rare place where children were encouraged to touch, test, build, and ask questions. That emotional attachment is why the groundbreaking is likely to feel different depending on where one stands: a milestone for the province, but a painful marker for those still pushing to reopen or repurpose the Don Mills site.

What the New Science Centre Is Expected to Include

The province says the new facility will span about 400,000 square feet and include a new mainland building, integrated Ontario Place pods, new interactive exhibits, and an upgraded Cinesphere. The design is being positioned around hands-on learning, immersive experiences, workshops, and more flexible programming space, with the Cinesphere expected to remain one of the signature pieces of the site.

The Cinesphere gives the project a heritage hook that goes beyond the Science Centre itself. Opened at Ontario Place in 1971, the dome has long been one of Toronto’s most recognizable waterfront structures and is widely known for its IMAX history. The province’s pitch is that the new Science Centre will not simply replace the old building, but combine science programming with existing Ontario Place landmarks. That argument, however, has not erased concerns about whether the move weakens the legacy of the original Don Mills campus.

The Don Mills Site Remains the Emotional Centre of the Debate

The former Science Centre at 770 Don Mills Road opened in 1969 and was designed by Raymond Moriyama, whose work helped make the building part of Ontario’s modern architectural identity. It was commissioned as a Centennial-era project and became known as one of the early major interactive science museums, built around a then-bold idea: learning could be hands-on, messy, loud, and memorable.

That is why the closure of the Don Mills building in June 2024 landed so sharply. The province cited professional engineering advice and concerns related to reinforced autoclaved aerated concrete roof panels. Opponents argued that the closure was too sweeping, too sudden, and too convenient given the earlier relocation plan. For families in Flemingdon Park, Thorncliffe Park, and across the GTA, the shutdown felt like the loss of both a cultural institution and a neighbourhood anchor.

The Auditor General’s Findings Keep Fueling Skepticism

The Auditor General of Ontario has been central to the public debate because the office questioned how the relocation decision was made. A follow-up report said the original decision was based on preliminary and incomplete costing information and proceeded without full consultation from key stakeholders, including the City of Toronto, the Toronto and Region Conservation Authority, and affected school boards.

That finding matters because the Science Centre was never only a tourism asset. It served school groups, suburban families, community programs, and generations of children who may not have had easy access to comparable science experiences. The Auditor General also found little or no progress on studying how the move could affect access for school groups and families with young children. That leaves a major unresolved question: whether a waterfront location can serve the same educational role as the old site.

The Cost Question Has Become Harder to Ignore

The province awarded a fixed-price contract valued at $1.04 billion to Ontario Science Partners to design, build, finance, and maintain the new Science Centre. The broader financial debate is even larger because the Auditor General reported that the estimated 50-year cost of building and maintaining the new Ontario Place Science Centre had increased by $397 million from the earlier business case, bringing the estimate to about $1.444 billion.

That number changed the tone of the debate. The government originally presented relocation as a way to save money compared with maintaining the Don Mills facility over the long term. Critics now argue that the cost advantage has weakened or disappeared. For taxpayers, the issue is not only whether the new building looks impressive, but whether the province has made the strongest financial case for moving a major public institution instead of repairing, renewing, or reimagining its original home.

Ontario Place Is Carrying More Than One Controversy

The new Science Centre is part of a much larger Ontario Place redevelopment. Infrastructure Ontario has said the completed site is expected to include about 50 acres of public park space and draw between four and six million visitors a year. The province’s broader vision is a year-round waterfront destination with public spaces, cultural attractions, entertainment, and upgraded infrastructure.

But Ontario Place has also become a symbol of public distrust over redevelopment decisions. The Auditor General found that projected public costs for the wider Ontario Place redevelopment rose dramatically, reaching an estimated $2.237 billion as of early 2024. Advocacy groups have also challenged aspects of the redevelopment, arguing that public waterfront land should remain accessible and transparent in its planning. That broader controversy has made the Science Centre relocation feel, to many critics, like one piece of a larger fight over who the waterfront is really for.

Temporary Programming Is Trying to Fill the Gap

With the Don Mills building closed and the permanent Ontario Place facility not expected until 2029, temporary programming has become essential. The province announced an interim Science Centre location at Harbourfront Centre, planned to open by summer 2026 and cover about 86,000 square feet. KidSpark had already opened at Harbourfront Centre in late 2024, while Science Centre experiences also appeared at CF Sherway Gardens.

These temporary spaces keep the brand alive, but they do not fully replace what was lost. A mall-based exhibit or waterfront interim space can still excite children, especially with familiar hands-on activities, but the original Science Centre offered scale, ravine-side architecture, school-trip capacity, and a sense of discovery that was difficult to replicate. For parents and educators, the interim years may feel like a patchwork solution while a generation of students waits for a permanent home.

The Province Is Betting on a More Modern Visitor Experience

The government’s case rests partly on the idea that a new facility can do more with a modern layout. Infrastructure Ontario says the project will use a design-build-finance-maintain model, with a 30-year maintenance term intended to create more cost and schedule certainty. The facility is also expected to target sustainability measures tied to energy use, greenhouse gas intensity, thermal performance, and LEED certification.

That could matter if the finished centre delivers flexible exhibit halls, better visitor flow, modern classrooms, improved accessibility, and stronger digital experiences. Museums and science centres increasingly compete not just with other attractions, but with screens, gaming, short-form video, and immersive entertainment. A successful new Science Centre will need to feel alive from opening day, not just architecturally impressive. The challenge is that public trust has been bruised, so the province will need the visitor experience to justify the disruption.

Access for Schools and Families Remains a Major Test

One of the most practical questions is whether the new Ontario Place location will work for school groups and families across the GTA. The old Don Mills location had its own access challenges, but it was familiar to school boards, buses, and families in the east and north parts of Toronto. Ontario Place offers a more central waterfront identity, yet it also raises questions about traffic, bus access, parking, transit connections, and affordability.

This is where the debate becomes less symbolic and more everyday. A Science Centre succeeds when teachers can plan trips without logistical headaches, parents can afford repeat visits, and children from different parts of the province can see themselves in the programming. If the new location becomes more tourism-focused than education-focused, critics will say the province misunderstood the institution’s purpose. If it broadens access and delivers strong school programming, the government will have a stronger case.

The 2029 Opening Date Leaves Years of Scrutiny Ahead

The province says the new Science Centre is on track to open in 2029, but the years between groundbreaking and opening will be closely watched. Construction progress, budget discipline, exhibit planning, accessibility, interim programming, and the fate of the Don Mills site will all remain politically sensitive. The project may have broken ground, but the public argument is not over.

The biggest question is no longer whether Ontario intends to build a new Science Centre at Ontario Place. It clearly does. The question now is whether the finished institution can win back trust from people who feel the old one was taken away before its future was properly debated. A successful opening would require more than a striking building on the waterfront. It would need to prove that Ontario did not just move a landmark, but preserved the spirit that made it matter.

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