THE LOUIS-HIPPOLYTE-LA FONTAINE TUNNEL: WHY THIS PROJECT MATTERS MORE THAN WE THINK

19 hours ago
2 min read

If you live in Montréal or on the South Shore, you probably know the tunnel mostly for one thing lately: traffic. But there’s a much bigger story here.

Aerial view of a highway bridge crossing a river toward an industrial city skyline, with autumn trees and light traffic.

Opened in 1967, the Louis-Hippolyte-La Fontaine Tunnel was overdue for major rehabilitation. Once work began, the condition of the concrete structure was found to be more deteriorated than originally anticipated, forcing Québec to significantly expand the work.

This isn’t simply repaving a tunnel. The project involves major structural rehabilitation, reconstruction of walls and roadway, new ventilation, drainage, pumping and fire-protection systems, modernized lighting and technology, plus approximately 13 km of Highway 25 rehabilitation.

And the price reflects that. The project, originally estimated at roughly $1.4 billion, has grown to approximately $2.8 billion. So where are we now? The first tube was completely renovated in 2025 and traffic was transferred into it so work could begin on the second tube. The important date is late fall 2026, when both tubes are expected to reopen with two lanes in each direction. Some work will continue through 2027. Before construction, approximately 120,000 vehicles per day used this connection.

Aerial view of a highway construction site beside a river, with lanes, trucks, cranes, and green trees under a clear sky.

Here’s where I think it gets interesting for real estate. For the past several years, buyers looking at the South Shore have had to mentally add the tunnel into their buying decision. "I love Boucherville, but what about the tunnel? Longueuil makes sense, but what will my commute look like?"

That hesitation matters. Yet despite years of major construction, Boucherville and Longueuil have continued to perform well. In Boucherville, the median single-family home reached approximately $805,000 in Q2 2026, up 3% year-over-year, with active single-family listings down 8%. In Vieux-Longueuil, the median reached approximately $628,000, up 5% year-over-year. And this isn’t only about those two markets.

Better movement through this corridor affects the relationship between Boucherville, Longueuil and the surrounding South Shore, while improving an important connection into Montréal’s east end and the Highway 25 corridor.

My opinion? I think we underestimate how much infrastructure influences real estate. A tunnel reopening doesn’t magically make a house worth 10% more. Real estate doesn’t work that way. But remove a major friction point from a location and people’s perception of that location can change. If a family can get more house, more land and a suburban lifestyle in Boucherville or Longueuil while maintaining a more predictable connection to Montréal, that matters.

And on the Montréal side, better connectivity strengthens the accessibility of the east end. That’s why I pay attention to infrastructure projects just as much as housing statistics. Real estate isn’t only about where people want to live today. It’s about understanding how a city is evolving, where people are moving and what could make an area more desirable tomorrow.

Workers on a vast concrete construction site with cranes and scaffolding around a large rectangular structure.

The Louis-Hippolyte-La Fontaine Tunnel is a $2.8-billion investment in connectivity between two major housing markets. I think that’s worth paying attention to. Thinking about buying, selling or investing in Greater Montréal? Let’s look beyond today’s numbers and talk about where the market could be heading next.

Send me a message. I’m always happy to talk real estate.

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