A metal handrail is installed by fixing its posts or brackets to solid structure, then fitting and joining the rail at the right height. Posts go into concrete either in core-drilled, grouted holes or on welded base plates with anchors; on steel stairs they are welded or bolted to the stringers; wall rails sit on brackets screwed into studs, blocking or masonry. In Ontario, required handrails on stairs must end up 865 mm to 1,070 mm high, measured from the line of the tread nosings.
This guide walks through how installers do it, so you know what to expect, what has to be ready on site and where things go wrong. For choosing a style or reading the code in full, see our guides to steel stair railings and handrails and Ontario guard and handrail rules.
What has to be ready before installation
Most railing problems start before the installer arrives. A custom steel railing is measured, drawn and fabricated to the site, so the site has to be at its final shape.
- Stairs and landings complete. Treads, risers and landings in place, including any concrete toppings or tile. Handrail height is measured from the finished nosings, so finishes change the numbers.
- Walls ready for brackets. Blocking installed behind drywall before it is closed in, or a plan for anchoring into concrete or block.
- Waterproofing settled. On balconies, terraces and exterior stairs, the membrane installer and the railing installer need to agree where posts go through, or whether they should be side-mounted instead.
- Hidden services located. Concrete may contain rebar, post-tensioning tendons, in-floor heating pipes or conduits. Commercial jobs usually scan before drilling. In a house, check where radiant tubing runs before anyone drills a slab.
- Permit and drawings. Railings that are part of a permitted renovation or new build are inspected with the job. On commercial and multi-unit work the railing usually has its own shop drawings, and guards may need an engineer's design.
Site measure and layout
A good install starts with a field measure, taken once the stair or deck is in. The fabricator records:
- Floor-to-floor heights and the actual rise and run of each step
- The angle of the stair and any turns or landings
- Where posts can land (clear of joints, drains, edges and hidden services)
- Wall locations and what each wall is made of
- Fixed points such as doors, columns and windows that the railing has to clear
Back at the shop, that measure becomes shop drawings showing every post, bracket, splice and fastener. Our post on shop drawings vs fabrication drawings explains what those drawings are for. On site, the installer snaps lines and marks post locations from the drawings before any drilling.
How metal railings are fixed to concrete
Concrete is the most common substrate for steel railings: stairs, slab edges, balconies and exterior steps. There are four main methods.
| Method | How it works | Good for | Watch for |
|---|---|---|---|
| Core-drilled and grouted | Holes cored into the concrete, posts set in and filled with non-shrink grout or anchoring compound | Clean look with no plates, exterior steps, slab tops | Water at the post; slope the grout to shed water. Needs enough concrete depth and edge distance |
| Base plate and anchors | Plate welded to the post, fastened with mechanical or adhesive anchors | Interior stairs, slabs, quick installs | Anchors near an edge can break out the concrete. Plates are visible |
| Fascia (side) mount | Posts or brackets fixed to the vertical face of a stair stringer or slab edge | Keeping walking surfaces clear, avoiding membranes | Needs a solid, thick enough edge; anchors work in a different direction |
| Cast in during the pour | Sleeves or embedded plates set in the forms before concrete is placed | New concrete stairs and balconies | Must be located accurately before the pour |
The core-drilled method, in outline: posts are marked out, holes are cored a little larger than the post, the holes are cleaned out, posts are stood in and braced plumb and at the right height, and the annular gap is filled with a grout or anchoring product made for the purpose. The top of the fill is sloped away from the post so water does not sit there. The railing stays braced until the material has cured to the strength its manufacturer specifies.
The base plate method, in outline: plates are set on the marks, anchor holes are drilled to the anchor manufacturer's diameter and depth, holes are cleaned, anchors are installed and torqued or cured, and the plates are shimmed or grouted level where the floor is uneven. Edge distance, spacing and embedment come from the anchor manufacturer's published data and the designer, not from guesswork.
We compare embedded and plated posts in more depth in embedding steel posts in concrete vs base plates.
Steel stairs, wood decks and walls
On steel stairs the railing is usually the easiest part. Posts are welded or bolted to the stringers, often to tabs or plates added in the shop so the field connection is just a few bolts. Where field welds are needed, they are ground and touched up with the stair's finish.
On wood decks and stairs posts bolt through the rim joist or stringer with solid blocking behind. A steel post is only as firm as the wood frame it is fixed to, so the framing and connection have to be checked. Our article on steel railings for balconies and decks covers deck connections.
On walls, handrails sit on brackets. The code points that matter on site:
- Solid fixing. Brackets go into studs, blocking, concrete or masonry, never drywall alone. For handrails serving a single dwelling fastened to wood, the 2024 Ontario Building Code (Sentence 9.8.7.7.(2)) deems the attachment adequate when brackets are no more than 1.2 m apart, the end brackets are within 300 mm of the rail ends, and each bracket has at least two No. 8 wood screws penetrating at least 32 mm into solid wood.
- Clearance. At least 50 mm between the rail and the wall, or 60 mm if the wall is rough or abrasive (Article 9.8.7.5.). Bracket projection sets this.
- Load. Handrails and their supports must resist a concentrated load of at least 0.9 kN applied at any point and in any direction (Article 9.8.7.7.). Outside a single dwelling, a uniform load also applies.
Setting height, joining rails and finishing
Once posts and brackets are fixed, the rail goes on.
- Height check. The installer measures from a straight line along the tread nosings to the top of the rail and confirms it falls within 865 mm to 1,070 mm (Article 9.8.7.4.) along the full flight.
- Continuity. Required handrails must be continuously graspable from the bottom riser to the top riser, with nothing on top that breaks a handhold. Outside a single dwelling, at least one handrail must also extend horizontally at least 300 mm beyond the top and bottom of each flight.
- Splices. Long rails come in sections. Shops pre-weld as much as they can, then the sections are joined on site with internal sleeves and screws, bolted flanges or short field welds ground smooth.
- Ends. Rail ends are returned to the wall, turned down to a post or capped, so they don't catch clothing or create a hazard.
- Touch-up. Every field weld, drilled hole and scratch is cleaned and coated to match. Painted steel gets primer and paint; galvanized steel gets a zinc-rich repair coating. Bare cut edges outdoors rust quickly.
Guards (the barrier at an open side) follow the same installation steps but have their own height, opening and load rules. Our guard and handrail code guide lists them.
Stainless steel handrail installation
Stainless follows the same mounting methods, with a few extra precautions:
- Keep carbon steel away. Grinding discs, wire brushes or drill swarf from ordinary steel embed iron particles in the stainless surface, which then rust and stain. Installers use tools reserved for stainless.
- Use stainless fasteners and anchors so the fixings don't corrode or stain the rail.
- Plan for fewer field welds. Welding stainless on site discolours the metal, and restoring the finish takes careful cleaning and polishing. Bolted or sleeved splices are often preferred.
- Protect the finish with film or wrapping until other trades are done.
What drives the cost of handrail installation
We don't publish prices, because every railing is different, but these are the factors that move an installation quote:
- Substrate: concrete needing core drilling takes longer than bolting to a steel stringer.
- Number of posts and brackets and how they are spread across flights and landings.
- Field welding vs bolted connections.
- Access: occupied homes, upper floors, tight stairwells and exterior work in winter.
- Waterproofing details at balconies and terraces.
- Finish and touch-up, especially stainless or powder-coated rails.
- Inspection and coordination with other trades.
The way to get a firm number is a quote based on drawings or a site measure. Our guide to getting a custom steel railing quote in the GTA lists what to send.
Getting a steel railing made
We fabricate custom steel railings, along with stairs, gates and ladders, to your drawings, with CWB certified shop welding and in-house shop drawings, and we deliver across the GTA and Ontario. We fabricate and deliver, and installation is by your installer or contractor. Send drawings, photos or measurements, or see our fabrication services.
Frequently asked questions
How do you fix a metal railing into concrete?
Either set the posts into holes core-drilled in the concrete and fill them with a non-shrink grout or anchoring compound, or weld a base plate to each post and fasten it with anchors rated for concrete. The choice depends on slab thickness, edge distance, waterproofing and the look you want.
How high does a handrail have to be in Ontario?
Under the 2024 Ontario Building Code Part 9, required handrails on stairs and ramps must be 865 mm to 1,070 mm high, measured from a line along the tread nosings. Guards have separate, higher requirements.
Can a metal handrail be screwed into drywall?
No. Brackets must reach solid structure such as studs, blocking, concrete or masonry. For a single dwelling, the code deems wall rails adequate when brackets at no more than 1.2 m centres each have at least two No. 8 wood screws penetrating 32 mm into solid wood.
Is a steel railing welded or bolted on site?
Both are used. Shops weld as much as possible in fabrication, then join sections on site with bolted sleeves or short field welds that are ground and touched up. Less field welding means a faster, cleaner install.
What affects the cost of installing a metal handrail?
The substrate (concrete, wood, steel or masonry), how many posts or brackets there are, whether holes must be core-drilled, how much field welding is needed, site access, the finish and any waterproofing details. Ask for a quote with your drawings or photos.
