The acronym WETT stands for Wood Energy Technology Transfer. It is a Canadian non-profit organization that administers training and certification for technicians who assess solid-fuel-burning systems — fireplaces, wood stoves, pellet appliances, and the chimneys connected to them. A WETT inspection is not a government program, but its certificates are accepted by most Canadian home insurers as evidence that a wood-burning system has been reviewed by a qualified person.
Why the Inspection Matters
Canadian insurers vary in how they handle wood-burning appliances. Some require a current WETT certificate before writing a policy; others ask for one when a claim involving the heating system is filed. In Ontario and British Columbia, several brokers have moved to mandatory WETT documentation for any home with a wood stove or fireplace insert installed after 1990. Getting ahead of that requirement — rather than discovering a coverage gap during a claim — is the practical reason most homeowners book an inspection.
Beyond the insurance angle, the inspection identifies structural problems in the flue that aren't visible from the firebox opening. Cracks in clay tile liners, spalling at the flue crown, mortar deterioration at chimney joints, and animal nesting material inside the flue are common findings that a visual check from inside the home won't catch.
The Three Inspection Levels
WETT follows the same tiered scope framework used by the National Fire Protection Association's NFPA 211 standard, adapted for Canadian appliance types.
Level 1 — Visual Accessible Areas
The technician examines everything reachable without tools or equipment removal: the firebox, smoke chamber, damper, accessible flue sections viewed from above and below, the exterior chimney crown, and flashing. This is the standard annual check appropriate when the appliance and chimney have not changed since the previous inspection and the system has been in normal use.
Level 2 — Includes Video Scan
Level 2 adds a camera scan of the full flue length. The Canadian Standards Association's CSA B365 and WETT training materials recommend a Level 2 when property ownership changes, when the fuel type or appliance type is being switched, after a chimney fire, or after any event — earthquake, flood, structural renovation — that may have affected the chimney. Most home purchase transactions that involve a wood-burning system trigger a Level 2 request from the buyer's insurer or lawyer.
Level 3 — Destructive Investigation
Level 3 applies when a Level 1 or Level 2 inspection reveals a suspected hazard that cannot be confirmed without removing parts of the chimney structure. It may involve opening a section of wall, removing the smoke chamber plaster, or accessing flue areas that are otherwise enclosed. This level is uncommon but warranted when there is evidence of a past chimney fire or when the liner's condition cannot be determined non-destructively.
What Goes Into the Report
A WETT inspection report documents the appliance make, model, and serial number (where available), the liner material and condition, clearance distances measured on site, any deficiencies noted, and whether the system meets the installation requirements of CSA B365 and the local authority having jurisdiction. The technician will also note whether the appliance carries a valid CSA or ULC listing — an important detail for unlisted older units that may not be insurable at all.
Deficiencies are rated by severity. Minor items — a deteriorating rope gasket on a stove door, a slightly damaged cap — are noted but do not necessarily make the system uncertifiable. Structural liner cracks, clearance violations, or missing cleanout access are treated as conditions requiring correction before the system should be used.
How Often to Schedule an Inspection
The WETT organization recommends an annual Level 1 inspection for any actively used solid-fuel appliance. Given that most Canadian homeowners burn wood from October through April, booking in August or September — before the first fire — ensures that any deficiencies discovered can be addressed before the heating season starts. Technician availability tightens considerably in November once cold weather arrives.
Finding a Certified Technician
The WETT website maintains a searchable directory of certified technicians organized by province. Certification levels vary: WETT Registered Chimney Sweep, WETT Site Assessor, and WETT Registered Inspector carry different scopes of authorization. Only a WETT Registered Inspector or Site Assessor can issue a formal inspection certificate accepted for insurance purposes. Asking for the technician's certification number before booking is reasonable practice.
External reference: WETT — Find a Technician
Costs Across Canadian Provinces
Inspection fees are not standardized and vary by region, level of inspection, and whether the technician also offers cleaning. A Level 1 inspection in mid-sized Ontario or Alberta cities typically runs between $150 and $300. Level 2 with video scan adds $75 to $150 to that range depending on the flue length and accessibility. Travel surcharges apply in rural areas. The inspection fee is separate from any cleaning or repair work the same technician may recommend.
Last updated: May 4, 2026
