Why Credentials Matter for Chimney Work
Chimney service in Ontario sits at the intersection of fire safety, insurance requirements, and in some cases, regulated gas work. Unlike painting or landscaping, mistakes in chimney service can have life-threatening consequences — an improperly assessed flue can allow carbon monoxide into the home or contribute to a chimney fire. Hiring someone with the right credentials is not about formality; it is about ensuring the inspection or repair is done correctly and that the documentation you receive is actually accepted by your insurance company.
There are two primary credential streams: WETT certification for solid fuel (wood-burning) systems, and TSSA licensing for gas appliances. A single provider may hold both, or you may need different providers depending on what type of system you have.
Step-by-Step: Hiring a Chimney Service Provider
Confirm WETT certification for wood-burning systems
For any wood-burning appliance — fireplace, wood stove, or insert — look for a technician with current WETT (Wood Energy Technology Transfer) certification. WETT certification is the industry standard in Canada and is required by most Ontario insurers before they will provide coverage for a home with a solid fuel appliance. Ask for the technician's WETT certification number; you can verify it through the WETT Inc. national registry at wettinc.ca.
Verify TSSA licence for gas fireplace work
Gas fireplace servicing — including inspection, cleaning, or any part replacement — requires a licence from the Technical Standards and Safety Authority (TSSA) in Ontario. This is a legal requirement, not a suggestion. Gas work by unlicensed individuals voids home insurance and creates serious safety risk. Ask for the technician's TSSA fuel safety registration number before booking any gas fireplace service.
Book in September–October for pre-season service
Chimney service demand in Renfrew County spikes sharply in late October and November when homeowners realize they need service before using their fireplace or wood stove. Quality providers — especially those offering WETT inspections — book up weeks in advance. Scheduling in September or early October gives you first pick of time slots and ensures your system is ready before cold weather arrives. Avoid lighting fires in an uninspected chimney after a long summer idle period.
Ask about sweep and WETT inspection bundling
Many chimney service providers offer a combined sweep and WETT inspection package, which is typically more economical than booking each service separately. When comparing providers, ask for the bundled price and clarify which level of WETT inspection is included: Level 1 is a visual examination of accessible components (sufficient for most insurance renewals), while Level 2 includes video scanning of the flue interior and is typically required for real estate transactions. A complete service record from a single visit is also more useful for insurance documentation.
Request a written WETT inspection report
The value of a WETT inspection is the formal written report it produces — this is what your insurance company needs on file. The report documents the system type, installation details, clearances, condition of flue components, and any deficiencies found. Confirm in advance that a written report will be issued and ask whether your insurer requires a specific format. Some insurers have their own forms; a reputable inspector will be familiar with common requirements.
Verify WSIB clearance
Chimney work involves roof access, ladder work, and often working at height — all of which carry fall risk. Confirm that your service provider holds current Workplace Safety and Insurance Board (WSIB) coverage by requesting a clearance certificate before work begins. If a worker is injured on your property and the company does not carry WSIB coverage, you may be held personally liable. This step is non-negotiable for any trade that works on your roof.
Ask for photos of any deficiencies found
A thorough chimney inspection should document any problems with photographs. Cracked clay tiles, deteriorated crowns, improper clearances to combustibles, bird or animal nesting, and failing mortar joints should all be photographed and included with the written report. This protects you if there is any dispute about pre-existing conditions, and gives you a clear visual record to share with masonry contractors when obtaining repair quotes.
Red Flags to Watch For
- Cannot provide WETT certification for wood-burning work. This means their inspection has no insurance value. Do not accept uncertified inspections as equivalent.
- No TSSA licence for gas fireplace servicing. Mandatory in Ontario. Walk away.
- Won't provide a written WETT inspection report. An inspection without a report is useless for insurance purposes.
- Pressures immediate "urgent" repairs without documentation. Legitimate inspectors find problems and quote repairs — they don't use fear tactics to push you into same-day emergency work without showing you evidence of the deficiency.
- No WSIB clearance. Suggests the business is operating informally, which creates liability risk for you as the property owner.
- Won't quote in writing before the job starts. Any reputable provider will give a written quote for cleaning and inspection. Structural repair quotes may follow once the extent of damage is assessed, but the initial service price should be confirmed in writing.