A restaurant that loses its plumbing on a Friday night is $8,000 of revenue gone down the drain. An office that closes its washrooms Tuesday morning is 40 employees sent home. Commercial plumbing isn't just bigger — it's an operational concern that demands a partner, not a handyman.
Here's what a restaurant manager, office operator, retailer, or building owner in Montreal should demand from a commercial plumber in 2026 — from realistic SLAs to preventive maintenance programs, plus grease trap management and the CMMTQ/RBQ compliance your insurer will check.
The SLAs that matter — beyond "we'll come when we can"
A serious commercial plumber operates with written service level agreements. Here's what we consider industry standard in Montreal:
- Phone response: 15 minutes in business hours, 30 minutes after hours. If you leave three messages with no callback, your partner isn't one.
- Non-urgent intervention: 24 business hours. Leaky undersink, dripping faucet — nothing stopping operations.
- Urgent intervention: 2 hours, 24/7. Active leak, blocked toilets, clogged drain. A plumber on the way within the hour of the call.
- Full restoration: under 48 hours for any major incident, with a contingency plan (tarps, portable toilets, operational workaround).
Ask for these numbers in writing. An annual contract runs $1,500 to $5,000 depending on the size of the establishment — and the first avoided emergency pays it back.
Preventive maintenance — the 4 pillars
Commercial preventive maintenance isn't a soft annual visit. It's a structured calendar:
- Quarterly inspection of critical points — shut-off valves, pressure regulators, commercial water heaters, grease traps.
- Annual hydrojet of the main drain and stacks — especially for food service (grease) and clinics (miscellaneous residue).
- Biennial camera inspection of the main drain, documented. Tracks evolution — we see the problem coming before the incident. See our detailed guide to camera inspection.
- Annual pressure test of hot water systems (tanks, recirculation loop, thermostatic mixing valves).
CMMTQ, RBQ, insurance — the trio that saves the big claims
For a plumbing-related incident to be covered by your commercial insurance, the work that preceded it must have been done by a licensed contractor. In practice:
- RBQ licence with active subcategory 15.9.2 (plumbing).
- CMMTQ membership (Corporation des Maîtres Mécaniciens en Tuyauterie du Québec) — competency assurance and Qualité Habitation warranty plan.
- Civil liability insurance of at least $2M — ask for the certificate.
- CNESST up to date for every worker on site.
Our guide how to choose a good plumber covers the exact questions to ask during selection — apply them to commercial with even more rigour.
Grease traps — the restaurant constraint
The City of Montreal requires a grease trap (grease interceptor) for every food-service establishment. Mandatory maintenance includes:
- Pump-out every 30–90 days depending on volume — documented in an inspector-verifiable log.
- Full annual cleaning with compliant waste disposal (Environment Canada, hazardous waste).
- Inspection of the main drain upstream of the trap — traps overflow when the drain slows.
A municipal fine for non-compliant traps starts at $500 and can reach $2,000 per infraction. Our team manages the schedule, pump-outs, and documentation — you never have to think about the trap.
After-hours access — the detail that makes the difference
To minimize operational impact, most commercial work happens outside operating hours: a restaurant at 2am, an office on Sunday, a clinic in the evening. Demand a partner who works nights and weekends without punitive surcharges and can be trusted with keys and alarm codes.
We operate with documented access protocols for each commercial client — assigned plumber when possible, qualified backup second, never an unknown sub in your building at 3am.
Commercial pricing — what changes from residential
Three notable differences:
- Annual packages bundling maintenance + X emergency hours at preferred rate. Predictable. Budgetable.
- Project billing for renovations (rather than hourly) — avoids unpleasant surprises.
- Volume discount for multi-site chains — one contract, every location covered.
Sectors we serve in Montreal
- Food service — grease traps, hot water networks, industrial dishwashers, recurring drain unclogging.
- Offices and commercial buildings — public washrooms, water fountains, leak detection, backwater valves.
- Retail — light installations, quarterly maintenance, emergencies.
- Clinics and medical offices — sterile water, specialized interceptors, health code compliance.
- Condos and co-ops — shared stacks, syndicate management, co-owner communication.
Summary — the commercial partner checklist
- Written SLAs (15 min response, 2 hr emergency)
- Structured preventive program, not just one visit per year
- CMMTQ + RBQ + $2M liability, certificates on file
- Grease trap management if food service
- After-hours access, assigned plumber
- Flat-fee billing for projects
Plomberie PSF has been the commercial partner for restaurants, offices, retailers, and syndicates in Montreal and Lanaudière for over ten years. CMMTQ member, RBQ licence, insurance up to date, team available 24/7. For an annual contract proposal — or to talk about an active emergency — call (514) 655-6560 or go through /contact. We call back within the hour.