The right steel staircase fabricator for a GTA project is one that can show you certified welding, prepare proper shop drawings, check the stair against the Ontario Building Code before cutting steel, and tell you clearly what is and isn't in the price. Steel stairs are custom pieces built to one opening and one floor-to-floor height, so the shop you choose matters more than it would for a stock product. This guide covers who does what on a steel stair, the questions worth asking, and how to read the quotations you get back.
Who actually builds a steel stair
Searching for "steel staircase builders" or "steel stairs Toronto" turns up several kinds of business, and they do different parts of the job:
- Steel fabricators cut, fit, weld and finish the stair in their own shop from shop drawings. Some also deliver and install; others supply only.
- Stair companies and ornamental shops may design the look, fabricate in house or buy the steel frame from a fabricator, and pair it with wood, glass or stone finishes.
- General contractors and renovators take responsibility for the whole stair but usually subcontract the steel.
- Stair kit manufacturers sell standard spiral or straight stairs in set sizes. We compare that route with a made-to-measure stair in steel stair kits vs custom stairs.
None of these is wrong. What matters is knowing who carries each responsibility: the design, the drawings, the welding, the finish, the installation and the code check. When you call around, ask each company where the stair will be made and by whom.
What to look for in a steel stair fabricator
Certified welding
A stair carries people, and its welded connections between stringers, treads, landings and posts do the work. In Canada, company certification by the Canadian Welding Bureau (CWB) to CSA W47.1 is the recognized way a steel fabricator shows it has qualified procedures, qualified welders and welding supervision. Ask whether the shop that will build your stair holds that certification, not only the company quoting you. We explain what certification covers in why hire a CWB-certified fabricator.
Shop drawings done properly
Every custom stair should be drawn before it is built. Shop drawings show the stringer sizes, tread type and spacing, landing framing, connections at the top and bottom, railing posts and the finish. They are what you, your designer or your engineer approve before fabrication. A fabricator that prepares drawings in house can usually turn revisions around without waiting on an outside drafter. If you are unsure how shop drawings differ from other drawings in the package, see shop drawings vs fabrication drawings.
Code awareness
The Ontario Building Code sets the rise, run, width, headroom, landing, handrail and guard rules for every stair, steel or not. A good fabricator checks the geometry on the shop drawings and raises problems early, for example a headroom conflict with a beam or a run that is too short for public stairs. Our guide to Ontario Building Code rules for steel stairs covers the numbers.
Engineering when the stair needs it
Residential stairs are often built from a detailed drawing without a separate stamped design, depending on the project and the municipality. Commercial, industrial and multi-unit stairs commonly have specifications that ask the stair supplier to provide a design sealed by a professional engineer. Ask whether the fabricator can arrange that, and whether it is included in the quote. Some stairs, such as single-stringer feature stairs, need engineering regardless of building type.
Finish capability
Interior stairs are typically primed for paint or powder coated. Exterior stairs are usually hot-dip galvanized. Most fabricators send galvanizing and powder coating out to specialist shops, which is normal, but it affects scheduling and handling. Ask how the finish is handled and whether touch-up after installation is included. Outdoor stairs have their own considerations, covered in exterior steel stairs.
Site measuring and installation
Steel can't be trimmed on site like wood, so a stair has to match the real opening. Ask who takes the final site measurements, when (ideally after framing, slabs and openings are complete), and who installs. If the fabricator supplies only, your contractor or an installer takes on the fit, anchors and any field welding.
Questions to ask before you hire
Use these when you call or meet a fabricator:
- Will the stair be fabricated in your own shop?
- Is your shop certified by the CWB to CSA W47.1?
- Do you prepare the shop drawings, and will I get them to review before fabrication?
- Who takes the final site measurements?
- Is engineering included, and is it needed for my stair?
- Which finish do you recommend for this location, and who applies it?
- Do you install, and if so, does that include anchors, field welding and touch-up?
- How will the stair be delivered and brought into the building? In one piece or in bolted sections?
- Are the railings and guards included, and are they part of the same drawings?
- What does your quotation exclude?
For work on an active construction site, contractors will also ask for proof of insurance and a WSIB clearance certificate before a fabricator's crew comes on site. Homeowners hiring directly can reasonably ask the same.
Getting a steel staircase quotation or estimate
People search for a "steel stairs estimate" hoping for a quick number, but a steel stair is priced from its layout, not per step. Two stairs with the same number of risers can take very different shop time depending on landings, stringer type, treads and railings. We break down the cost drivers in how much steel stairs cost in Ontario.
To get a useful first estimate, send:
- Floor-to-floor height (finished floor to finished floor) and the opening size
- Interior or exterior, and what the stair serves (house, commercial, service)
- Straight run, L-shaped, U-shaped or spiral
- Tread type you want (steel, wood on steel, concrete-filled pans, grating)
- Railing style on each side, and any landing guards
- Finish
- Photos of the space and of stairs you like
- Architectural or structural drawings, if you have them
A first figure from a sketch is a budget. The firm price follows once the layout is confirmed, and it should not change unless the scope changes after you approve the drawings.
What a good stair quotation spells out
When quotations arrive, check that each one states:
- The layout, number of risers and landings it is based on
- Stringer and tread type and size
- Railings and guards, and on which sides
- Finish system
- Shop drawings, and engineering if required
- Delivery, and whether installation is included
- What is excluded: often floor finishes, wood treads, glass, permits, patching of walls or drywall, and work by other trades
If one quotation is far below the others, compare those lines. It is often missing the railings, the finish or the installation.
Red flags
- No drawings before fabrication. A shop that wants to build from a phone photo and a tape measure is guessing.
- Vague answers on welding certification. "Our welders have tickets" is not the same as a certified shop.
- No mention of the code. If nobody asks about headroom, guard height or what the stair serves, the risk sits with you.
- A single lump sum with no scope. You should be able to see what the price includes.
- Pressure to skip the permit. New or replacement stairs are often part of a building permit. Check with your municipality's building department.
How the process runs once you hire
A typical sequence for a custom steel stair in the GTA:
- Estimate from your sketch or drawings.
- Site measure once the opening and floors are built.
- Shop drawings prepared and sent for your approval (and your designer's or engineer's, where involved).
- Fabrication in the shop: cutting, fitting, welding, grinding.
- Finish: primer, paint, powder coat or galvanizing.
- Delivery in one piece or in sections sized for access.
- Installation and final connections, then railings if they come separately.
Lead times depend on the stair, the finish and the shop's schedule, so ask for a realistic date when you approve the drawings rather than relying on an early promise.
Working with Procut Steel on a stair
Procut Steel fabricates custom stairs, railings, gates and ladders as part of our miscellaneous steel work in Erin, alongside structural steel and rebar. Our shop welding is CWB certified, shop drawings are prepared in house, engineering services are available for projects that need them, and we deliver across the GTA and Ontario. Quotes and take-offs are free. We fabricate and deliver, and installation is by your installer or contractor.
Send your stair drawings or a sketch for a quote, or see our services for the full range of fabrication work.
Frequently asked questions
What is the difference between a steel stair fabricator and a stair builder?
A fabricator cuts, fits and welds the steel stair in a shop from drawings. A stair builder or contractor may design, buy and install a stair but often subcontracts the steel. Ask who will actually fabricate the stair and who is responsible for the drawings and installation.
Should a steel stair fabricator be CWB certified?
For any stair that carries people, yes. Company certification by the Canadian Welding Bureau to CSA W47.1 shows the shop has qualified welding procedures, qualified welders and welding supervision. Many commercial specifications require it.
Do I need drawings before I ask for a steel staircase quotation?
Not for a first estimate. A sketch with the floor-to-floor height, the opening size, photos and the style you want is enough for a budget figure. A firm price needs a dimensioned layout, and the fabricator's shop drawings are reviewed and approved before steel is cut.
Who makes sure a steel stair meets the Ontario Building Code?
The stair's designer sets the geometry and the owner or contractor is responsible for compliance, but a good fabricator checks rise, run, headroom and guard heights on the shop drawings and flags problems before fabrication. Commercial stairs are often designed or sealed by a professional engineer.
