What does a Toronto sheet metal contractor charge to fabricate custom duct fittings?

Custom duct fitting fabrication by a Toronto sheet metal contractor typically costs $50 to $300 per fitting, depending on the complexity, size, material gauge, and whether the fitting is fabricated in the shop or on-site. Standard catalogue fittings like 90-degree elbows, tees, and reducers in common sizes are usually available off the shelf at HVAC supply houses for $15 to $60 each, but many residential and commercial ductwork projects require custom fittings that do not exist in standard catalogues — and that is where a skilled sheet metal contractor's fabrication ability becomes essential.

Simple custom fittings — a non-standard-angle elbow, an offset, a transition from one duct size to another, or a rectangular-to-round adapter in an unusual dimension — typically cost $50 to $120 each for shop fabrication. The contractor works from measurements taken on-site, lays out the pattern on flat galvanized sheet metal (typically 26-gauge for residential branch fittings or 24-gauge for trunk fittings), cuts, brakes, rolls, and seams the fitting in the shop, then delivers it to the job site. Complex custom fittings — multi-piece radiused elbows, large rectangular trunk transitions, plenums with multiple takeoffs, or fittings that must navigate around structural obstacles like beams, plumbing, and electrical — can cost $120 to $300 or more each. These require more material, more layout time, and more skilled labour.

For exposed industrial-style ductwork in Toronto lofts and basement renovations, custom fittings command premium pricing because every joint is visible and must be finished to a higher standard. Exposed spiral duct fittings with clean welds, smooth transitions, and precise angles can cost $100 to $250 each, and a typical exposed installation might require 10 to 25 custom fittings. For premium finishes like powder-coated or painted custom fittings, add another $20 to $50 per fitting for finishing.

Shop fabrication versus on-site fabrication affects both cost and quality. Shop-fabricated fittings are made on a proper sheet metal brake, shear, and roller in a controlled environment — they are more precise, cleaner, and typically less expensive per fitting because the contractor works more efficiently in the shop. On-site fabrication is necessary when exact dimensions cannot be determined until the installation is underway, particularly in renovation work in older GTA homes where nothing is square, plumb, or level. On-site fabrication typically costs 20 to 40% more per fitting due to the less efficient working conditions and the need to bring portable tools to the job site.

The material gauge also affects pricing. Standard 26-gauge galvanized steel is the most economical for residential branch fittings. Trunk line fittings in 24-gauge cost 15 to 25% more. Heavy-duty 22-gauge fittings for high-pressure commercial systems cost 30 to 50% more. Stainless steel custom fittings — used in kitchen exhaust, corrosive environments, or high-end exposed installations — cost 2 to 3 times more than galvanized equivalents.

When getting quotes for a ductwork project that involves custom fittings, ask the contractor to itemize fitting fabrication costs separately from straight duct runs and installation labour. A project requiring 15 to 20 custom fittings at $80 to $150 each adds $1,200 to $3,000 to the total project cost — a significant line item that is worth understanding upfront. Experienced sheet metal contractors with their own fabrication shop can often suggest design alternatives that use fewer custom fittings without compromising performance, saving money while maintaining quality.