Sheet Metal Workers Local 397 crestSMART Local 397Sheet Metal · Roofers · Thunder Bay
Sheet metal worker on the tools

Organized in the Lakehead since 1910 · SMART affiliate · Thunder Bay

Live better. Work union.

Sheet Metal Workers & Roofers Local 397 has trained, dispatched and represented the skilled tradespeople behind Thunder Bay and Northwestern Ontario’s biggest builds for generations.

Sheet Metal Workers Local 397 crest

1910

Organized

1946

Chartered

2

Metal & roofing

SMART

Affiliate

Business Manager Dan Krupa · serving Thunder Bay & Northwestern Ontario

Latest

News & events

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Jun 2, 2026SMART Canada

SMART Canada shines at Skills Canada

Apprentices from Ontario, Nova Scotia and Saskatchewan competed at the Skills Canada / Compétences Canada Competition — with Local 30’s Lindsey taking silver and Local 296’s Mitchell bronze.

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May 19, 2026SMART Canada

New resources and support for Canadian members

SMART Canada Director Jack Wall announced three new member supports — a Canadian Facebook page, Enriched Academy financial wellness, and a Canadian Apprenticeship Strategy training-equipment grant.

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Sep 12, 2024Apprentices

Local 397 hosts the 51st Ontario Apprenticeship Competition

Local 397 hosted the 51st Annual Ontario Sheet Metal Workers Apprenticeship Competition in Thunder Bay, welcoming nine Ontario locals to Marina Park.

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Who we are

The hands behind
the Lakehead’s
biggest builds.

Organized sheet metal workers have worked the Lakehead since at least 1910, when the tinsmiths marched with Port Arthur’s unions. Local 397 was chartered in 1946 — founded by sixteen members at the Day Company of Canada plant in Fort William — and the local carried through the 1970 amalgamation of Port Arthur and Fort William into Thunder Bay. Today — as part of SMART, the International Association of Sheet Metal, Air, Rail and Transportation Workers — our members work in HVAC installation and service, architectural sheet metal, welding, sheeting and decking, and flat roofing, on the commercial and industrial projects that shape Northwestern Ontario.

More about Local 397
Architectural sheet metal in golden-hour light

Placeholder · Member photography coming

Resources

Agreements, wages & benefits.

The provincial ICI sheet metal agreement and the roofing agreement, the wage-and-benefit packages, pension and health & welfare — everything membership delivers, in one place.

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The work

In the shop & on the tools.

Full gallery
Outdoor welding on a steel frame
On-site welding
Shop welder mid-cut with sparks flying
Shop fabrication
Rooftop HVAC unit
HVAC installation
Architectural sheet metal roof
Architectural & roofing

Placeholder imagery · Member photography coming

The Sleeping Giant rising over Lake Superior, across the harbour from Thunder Bay

Member help

We’ve got your back.
On and off the job.

The local is here for more than dispatch. Whether it’s a question about your hours, benefits or pension, a problem on a job site, or you just need someone in your corner, the hall is the first call to make.

SMART also provides confidential mental-health and wellness resources for members and their families — support for stress, addictions, financial worries and family pressures. The trade is hard work; asking for help is not. Calls to the hall are private and never tied to your employer.

Sleeping Giant, Thunder Bay — photo by Ken Lund, CC BY-SA 2.0, via Wikimedia Commons