Twice as expensive and twice as long

There’s a pattern with big municipal projects – they tend to work out as twice as expensive and take twice as long as first projected. Listed here are the sewage ozonation plant, two composting plants, and the Bellechasse bus garage, plus the recently reopened city hall. The article considers others as well.

Isn’t the central problem a tendency to underestimate the scope and cost at the start, in order to get it accepted? Maybe we could stop doing that?