How do I verify that a parging contractor is properly licensed and insured in Ontario?

In Ontario, parging contractors don't require a specific trade license, but they must carry WSIB coverage and general liability insurance. Here's exactly how to verify their credentials and protect yourself before hiring.

WSIB (Workplace Safety and Insurance Board) verification is the most critical check for any masonry or parging contractor in Ontario. All contractors working on residential projects must carry WSIB coverage — if they don't and someone gets injured on your property, you can be held personally liable for medical costs and lost wages. Request the contractor's WSIB account number and verify their clearance status online at wsib.ca or by calling 1-800-387-0750. A valid WSIB clearance certificate shows they're current on premiums and coverage. Never hire a contractor who claims they don't need WSIB because they're "incorporated" or "work alone" — these are red flags.

General liability insurance protects you if the contractor damages your home, neighbouring property, or causes injury to third parties during the work. Request a certificate of insurance showing minimum $2 million general liability coverage. The certificate should be current (not expired) and name your property address as the location of work. Call the insurance company directly to verify the policy is active — some contractors carry fake certificates. Professional masonry contractors readily provide insurance certificates because they understand the risks involved in foundation work.

Business registration and HST number can be verified through the Canada Revenue Agency's GST/HST registry search online. Legitimate contractors operating above-board will have registered business numbers and charge HST on invoices over $30,000 annually. While not legally required for smaller operators, business registration suggests a professional approach to contracting.

Check references from recent parging projects in the GTA, ideally within the past 2-3 years. Ask to see photos of completed work and speak directly with past clients about quality, timeliness, and cleanup. Pay particular attention to how the parging has held up through GTA winters — properly applied parging should show minimal cracking or deterioration after 2-3 freeze-thaw cycles. Be wary of contractors who can't provide local references or only show photos without allowing you to contact past clients.

Red flags to avoid include door-to-door solicitors offering "leftover materials from another job," contractors demanding full payment upfront, quotes significantly below market rates ($8-18 per square foot for polymer-modified parging in the GTA), no written contract or warranty, cash-only payment requests, or pressure to sign immediately. Quality parging contractors are typically booked weeks in advance during peak season (April-October) and don't need to solicit door-to-door.

Get everything in writing including material specifications (polymer-modified vs. traditional parging), surface preparation steps, number of coats, curing procedures, cleanup responsibilities, timeline, and warranty terms. Professional contractors provide detailed written estimates and contracts because they understand that proper parging application has specific requirements that must be followed for long-term success in GTA climate conditions.

Verify the contractor understands GTA-specific requirements like minimum application temperatures (5°C day and night for 7 days), proper surface preparation including bonding agent application, and the importance of curing in Toronto's variable climate. Ask about their experience with your specific foundation type (poured concrete, concrete block, stone) and housing era, as different substrates require different approaches.

Need help finding a properly insured parging contractor? Toronto Parging can match you with local masonry professionals who carry proper WSIB and liability coverage for your project.