Required Site Signage

Construction Site Signage Requirements in Ontario: What the Law Actually Requires

Checked against O. Reg. 213/91 (Construction Projects) and the OHSA, e-Laws consolidation current to 2026. Section 11 (the old project-sign provision) was revoked by O. Reg. 426/21. General information, not legal advice — verify with the Ministry of Labour and your safety program.

Ontario construction sites are governed by a web of regulations that each impose specific signage and posting obligations. O. Reg. 213/91 covers the project sign, Notice of Project, emergency contacts, and most hazard-specific warnings. OHSA itself requires the green poster and JHSC/H&S rep postings. O. Reg. 860 handles WHMIS labels. O. Reg. 632/05 covers confined spaces. O. Reg. 278/05 covers asbestos. A Ministry of Labour inspector walking your site will check for every one of these. Missing a single required sign can trigger a compliance order, and if a worker is injured in an area that should have been signed, the absence of that sign becomes evidence of non-compliance in the prosecution.

What must be on the constructor's project notice? (s. 13)

Before work begins, O. Reg. 213/91 section 13(1) requires the constructor to post — in a conspicuous place at the project, and keep posted while work is done — a notice showing the constructor's name and business name, the address and telephone number of the constructor's head office or principal place of business in Ontario, and the address and telephone number of the nearest Ministry of Labour office. Within 48 hours of a Health and Safety Representative or Joint Health and Safety Committee being selected, section 13(2) requires the constructor to add each person's name, trade, and employer. This is the posting an inspector looks for first: it tells workers and the Ministry who is responsible for the project and where to direct a health-and-safety concern. A common misconception is that the regulation requires a "project sign" with a WSIB number visible from the street. That was the old section 11, which was revoked in 2021 (O. Reg. 426/21) — the current statutory posting is the section 13 notice, and it does not require a WSIB number. Many municipalities still require a site sign by bylaw, so check with your local building department, but do not confuse a bylaw sign with the section 13 notice, which must be posted regardless.

When do you have to file a Notice of Project? (s. 6)

Not every project triggers a Notice of Project, but many do. O. Reg. 213/91 section 6(1) requires the constructor to file one with the Ministry of Labour before work begins if the project meets any listed trigger. The one most crews hit is cost — a total expected labour-and-materials cost over $50,000 (over $250,000 for a project confined to an automobile factory). But the section also captures a building over two storeys or 7.5 m high; demolition of a building at least 4 m high with at least 30 m² of floor area; a bridge, earth-retaining or water-retaining structure over 3 m, or a silo or chimney over 7.5 m; compressed-air work; a tunnel, caisson, cofferdam or well; a trench over 1.2 m deep and over 30 m long (or over 300 m long); an ice road; and any work an engineer must design. There is no three-month duration trigger — that is one of the most common myths on Ontario sites, and relying on it can leave a qualifying job unfiled. The notice must include the project location, the constructor's name and address, the expected start and end dates, and a description of the work, and a copy must be kept posted or available on site (s. 6(6)). Filing is free and online. If you are close to a threshold, file anyway — there is no penalty for filing a Notice of Project for a project that turns out not to have needed one.

The OHSA poster and why it cannot be in a drawer (s.25(2)(i))

Every employer in Ontario must post the current OHSA poster — formally titled "Health & Safety at Work — Prevention Starts Here" — in a conspicuous location in the workplace. On a construction site, this means the site trailer, the lunchroom, or the main entry point where workers sign in. The poster covers the three fundamental worker rights under OHSA: the right to know about hazards, the right to participate in health and safety through the JHSC or H&S representative, and the right to refuse unsafe work. It also summarizes employer duties, supervisor duties, and worker duties. The word "conspicuous" is doing important legal work here — the poster cannot be in a closed filing cabinet, behind a door that is usually shut, or in a trailer that workers do not regularly enter. It must be where workers can see it during their normal routine. The poster is available free from the Ministry of Labour website and ServiceOntario offices. There is no excuse for not having one, and inspectors cite it frequently as a baseline indicator of whether the employer takes compliance seriously.

Emergency contacts — what must be posted and where (s.17)

O. Reg. 213/91 section 17 requires that emergency contact information be posted at the project and accessible to all workers. At minimum, this includes the telephone number for emergency services (911), the name, address, and telephone number of the nearest hospital or health care facility, the name and telephone number of the employer's designated emergency contact, and the name and telephone number of the site supervisor. On projects in remote areas where 911 service may not be reliable, the contact information for the nearest ambulance service and fire department should also be posted. The emergency contact list should be posted near a telephone or where workers gather — not buried in the site office. If a worker is injured and cannot quickly find the emergency contact information, the posting requirement has failed its purpose. Review and update the contacts regularly, especially on long-duration projects where supervisors and site office numbers may change.

WHMIS labels and SDS — the signage most sites get wrong

WHMIS 2015, implemented through O. Reg. 860, requires that every container of a hazardous product in the workplace bear a GHS-compliant label. This label must include the product identifier, the supplier identifier, GHS pictograms (the red diamond-shaped hazard symbols), the signal word (Danger or Warning), hazard statements, precautionary statements, and a reference to the Safety Data Sheet. When a hazardous product is transferred from its original container to another container for use — a common practice on construction sites with paints, solvents, adhesives, and cleaning products — the new container must have a workplace label that includes the product identifier, safe handling instructions, and a reference to the SDS. The most common violation inspectors find is unlabelled containers: a painter pours solvent into a coffee can, a labourer mixes a cleaning solution into a spray bottle, or a contractor stores diesel in an unmarked jerry can. Each of these is a WHMIS violation and each can draw a compliance order. The SDS binder must be physically accessible to workers at the workplace — not locked in the supervisor's truck or stored only on a computer that workers cannot access. Workers must receive WHMIS training before they handle any hazardous product, and that training must be specific to the hazardous products they will encounter on the site.

Asbestos and confined space warnings — signs that save lives

Asbestos warning signs under O. Reg. 278/05 are required at every approach to an area where asbestos-containing material may be disturbed. The sign must read "DANGER — ASBESTOS" or equivalent and must be posted before any asbestos work begins. For Type 2 and Type 3 asbestos operations, the work area must be enclosed with polyethylene sheeting under negative pressure, and the warning signs must be at every approach to the enclosure. The regulation is strict because even brief exposure to airborne asbestos fibres can cause mesothelioma, a fatal cancer with no cure. Workers who unknowingly walk into an unsigned asbestos abatement area are exposed to a risk they had no opportunity to assess or refuse. Confined space warning signs under O. Reg. 632/05 serve a similar life-safety function. Every entrance to a confined space — manholes, vaults, tanks, silos, pits — must be marked with a sign warning that the space is a confined space and that entry without authorization is prohibited. Confined space fatalities typically involve multiple victims: one worker enters, collapses from oxygen deficiency or toxic atmosphere, a second worker enters to rescue them and also collapses, and sometimes a third. The warning sign is the first line of defence against this cascade. It must be clearly visible before a worker reaches the entrance, not discovered after they have already entered.

What inspectors actually check — a practical signage walkthrough

When a Ministry of Labour inspector arrives at a construction site, the signage check typically follows a predictable pattern. From the street, the inspector looks for the constructor project notice with the constructor's name and the nearest Ministry office contact (s. 13). At the site entrance, they look for barricade and warning signs if the public has access nearby. In the site trailer or lunchroom, they check for the OHSA poster, the JHSC member names or H&S rep name, emergency contact numbers, the most recent MOL inspection report, and the SDS binder. Walking the site, they check for fire extinguisher location signs, first aid station signs, and any hazard-specific signs required by the conditions — confined space signs at manholes, asbestos signs at abatement enclosures, electrical hazard signs near overhead lines, crane warning signs and barricades at hoisting areas, and blasting signs if explosives are in use. They also check whether WHMIS labels are intact on all hazardous product containers. This entire walkthrough can happen in fifteen minutes, and each missing sign is a separate citation. The most common deficiencies that draw orders are: missing or illegible constructor project notice, OHSA poster not posted, JHSC member names not posted, unlabelled hazardous product containers, and missing confined space signs. The fix for every one of these is cheap and fast — the cost of a compliance order and the schedule disruption of a stop-work order is not.

Related tools and next steps

Work through the rest of the WSIB & OHSA compliance tools hub: check whether you need a committee or a representative with the JHSC & Safety Rep Requirements tool, confirm your labels with the WHMIS Label Checker, and size your kit with the First Aid Requirements tool. If you run a crew and want your project details, WSIB number, and safety postings organized alongside your timesheets, jobs, and invoicing, the paid Ontario contractor workspace keeps it all in one place.