Plumbing and HVAC are late-stage trades. By the time a GC is calling subcontractors for mechanical rough-in, they’ve already decided who they trust and the schedule is set. Getting into a project after that point means negotiating on price and schedule with no leverage.
The contractors who consistently stay busy aren’t waiting for those calls. They’re finding projects at the permit stage, before the GC’s phone list is finalized.
Why permits are especially useful for mechanical trades
For framing and concrete, the permit-to-start timeline is short. For mechanical trades, it’s longer. A plumbing or HVAC rough-in on a new residential build typically starts 4-8 weeks after the permit is issued. On commercial and multi-family projects, it can be 2-4 months.
That gap is the opportunity. A plumber who calls a GC 6 weeks before rough-in starts is a useful contact. A plumber who calls 6 days before is a last-minute backup at best.
What to look for
New construction permits, any new single-family, duplex, townhouse, or multi-family building needs full plumbing and mechanical rough-in. The declared project value in the permit data gives you a rough sense of scale.
Addition permits, additions that expand the heated envelope usually require HVAC modifications. Larger additions ($100,000+) often involve full system replacement.
Commercial alteration permits, tenant improvements in office and retail buildings consistently require HVAC modifications. Bathroom additions require plumbing. These are often fast-turnaround projects where the GC needs a reliable mechanical sub quickly.
Demolition followed by new build, a demolition permit followed shortly by a new construction permit at the same address is a strong signal. The owner is rebuilding, not just clearing land.
The conversation that works
When you call after a permit is issued, you’re not cold calling. You have a reason to reach out.
“I saw you pulled a permit for [address]. We handle plumbing rough-in for new builds in that area, are you staffed on the mechanical side yet?”
That’s a warm conversation. The GC knows you’re paying attention. Most of your competitors are waiting for the GC to post on a bid board or send a mass email. You’re calling before that stage exists.
Volume and concentration
Vancouver: Around 300 new construction and addition permits per month, based on SiteWire’s indexed data as of July 2026. Mechanical demand is spread across single-family in East Vancouver and multi-family downtown and in the Broadway corridor.
Calgary: Large new residential volume in the southeast and northeast. HVAC replacement demand is particularly high in the inner city where homes from the 1970s and 1980s are being renovated or replaced.
Surrey: Consistent townhouse and low-rise construction in Fleetwood, Cloverdale, and Panorama. Mechanical trades are in constant demand in these corridors.
Toronto: The highest volume market in Canada. Commercial HVAC in the 905 suburbs is underserved by large mechanical firms that focus on downtown high-rise.
Ottawa: Steady residential in Barrhaven and Kanata. Federal building renovations generate significant commercial mechanical work throughout the year.
Multi-trade coordination
One advantage of monitoring permits: you can coordinate with other trades. If you know a particular GC consistently uses the same framing crew, and you have a relationship with that framing crew, you can get a referral before the GC’s list even opens.
Permit data tells you who’s active in your area. The relationships you build using that data compound over time.
SiteWire for mechanical trades
SiteWire monitors Canadian permit feeds, filters by work type and project value, and sends alerts when projects matching your criteria are issued. You set the areas you work in, the project types you want, and the minimum value threshold. We handle the monitoring.