Confined Space in BC: WorkSafeBC Requirements

Last updated: March 2026

British Columbia takes confined space safety seriously, and WorkSafeBC enforces it with some of the heaviest penalties in the country. If your company runs crews in BC that enter tanks, vaults, manholes, or any enclosed space, you need to know Part 9 of the OHS Regulation, because getting it wrong can cost you six figures or shut down your project.

WorkSafeBC's confined space requirements are found in Part 9 of the Occupational Health and Safety Regulation (B.C. Reg. 296/97). Part 9 covers everything from definitions and hazard assessments to entry permits, atmospheric testing, standby persons, rescue, and equipment standards. BC uses a unique atmosphere classification system, low, moderate, and high hazard, that determines the level of precaution required for each entry.

This guide explains what BC contractors must do to comply with Part 9, how BC's approach differs from Alberta and Ontario, and what the penalties look like when WorkSafeBC shows up and finds problems.

For a national overview, see our complete Canadian confined space guide.

How Does BC Define a Confined Space?

Under WorkSafeBC's OHS Regulation, Section 9.1, a confined space is an area (other than an underground working) that:

1. Is enclosed or partially enclosed
2. Is not designed or intended for continuous human occupancy
3. Has limited or restricted means for entry or exit that may complicate first aid, evacuation, rescue, or other emergency response
4. Is large enough and so configured that a worker could enter to perform assigned work

Note that BC's definition has four elements, while Ontario's has three (and includes "may pose a hazard" as a criterion). BC does not require the space to be hazardous to meet the definition, even a space with clean air and no obvious hazards is still a confined space if it meets the four physical criteria above. The hazard level determines the precautions required, not whether the space qualifies as confined.

Common confined spaces on BC construction sites include utility vaults, catch basins, storage tanks, large-diameter pipes, pits, and marine vessel compartments (particularly relevant for BC's marine and shipyard industries).

BC's Unique Atmosphere Classification System

This is where BC's approach stands out from the rest of Canada. Instead of treating all confined spaces the same, Part 9 classifies the atmosphere into three categories that drive escalating requirements:

The classification must be determined by a qualified person as part of the hazard assessment. This is not a one-time decision, if conditions change during work (e.g., a worker starts welding and the atmosphere shifts from low to moderate hazard), the classification must be updated and additional precautions implemented.

What Must a BC Contractor Do? Step-by-Step Compliance

1. Identify All Confined Spaces (Section 9.2)

The employer must identify every confined space in the workplace and determine whether worker entry will be required, either for planned work or in response to foreseeable emergencies.

2. Secure or Mark Spaces That Do Not Require Entry (Section 9.3)

If a confined space exists but no entry is needed, secure each access point against entry or mark it with a sign indicating the nature of the hazard and the prohibition of entry. Instruct workers not to enter.

3. Develop a Written Confined Space Entry Program (Section 9.5)

Before any worker enters any confined space, the employer must prepare and implement a written program that includes:

• Assignment of responsibilities
• A list of each confined space (or group of similar spaces) with hazard assessments
• Written safe work procedures covering identification, entry permits, lockout, isolation, testing, ventilation, standby persons, rescue, lifelines, PPE, and coordination of work activities

4. Conduct a Hazard Assessment (Section 9.9)

A qualified person must assess the hazards of each confined space. This assessment drives the atmosphere classification and all subsequent precautions.

5. Prepare Written Procedures (Section 9.10)

Written procedures specifying how to eliminate or minimize all hazards must be developed based on the hazard assessment.

6. Issue Entry Permits (Sections 9.13–9.16)

Entry permits are required when the hazard assessment identifies atmospheric or other hazards requiring documented controls. The permit must include the date and time of entry, names of entrants, hazards identified, precautions taken, atmospheric test results, and rescue provisions. Permits must be kept up to date and retained as records.

For details on what must be on the permit, see our confined space entry permit guide.

7. Test the Atmosphere (Sections 9.25–9.26)

This is where BC gets specific. Pre-entry atmospheric testing must be:

• Completed not more than 20 minutes before a worker enters, if all workers leave for more than 20 minutes, testing must be repeated
• Done by a qualified person using calibrated instruments
• Recorded with specific data for each test

For moderate and high hazard atmospheres, additional testing must be conducted while workers are in the space. Continuous monitoring is mandatory if a flammable or explosive atmosphere of more than 20% LEL may develop.

BC defines "clean respirable air" with precise thresholds:

• Approximately 20.9% oxygen by volume
• No measurable flammable gas or vapour
• No air contaminant exceeding 10% of its applicable exposure limit under Part 5 (Chemical Agents and Biological Agents)

For specific gas thresholds and testing procedures, see our guide to confined space hazards and atmospheric testing.

8. Implement Lockout and Isolation (Sections 9.17–9.22)

All energy sources must be locked out per LOTO procedures. Adjacent piping must be controlled through blanking/blinding, disconnecting, double block and bleed, or equivalent alternative measures approved by WorkSafeBC.

9. Establish Rescue Capability (Sections 9.37–9.41)

Rescue services must be provided and available for immediate deployment. The employer must ensure:

• Adequate rescue equipment is available
• Rescue personnel are trained and have practiced the rescue procedures
• WorkSafeBC and emergency services are notified when required
• Rescue procedures are specific to the confined space, generic rescue plans are not acceptable

How BC Differs from Alberta and Ontario

The practical takeaway for contractors working across provinces: BC's 20-minute pre-entry testing rule is the strictest in Canada, and the atmosphere classification system means your procedures must explicitly address which hazard category the space falls into. A program that passes audit in Alberta may not meet WorkSafeBC's requirements without modification.

If you also operate in Ontario, see our Ontario confined space regulations guide.

WorkSafeBC Penalties for Confined Space Violations

WorkSafeBC does not issue warnings for confined space violations. They issue administrative penalties, and they are substantial:

• Metro Vancouver Regional District: $637,415 penalty for confined space violations in a sewer line, including failure to properly assess the space, inadequate controls, and allowing workers to enter without following required procedures
• Arc Resources: $140,615 penalty following a WorkSafeBC inspection of a Fort St. John work site
• Typical range: Administrative penalties for confined space violations commonly range from $10,000 to $200,000+, depending on the severity of the violation, the employer's compliance history, and whether a worker was harmed

Beyond administrative penalties, WorkSafeBC can issue stop-work orders, compliance orders, and refer cases for prosecution under the Workers Compensation Act. In cases involving worker death or serious injury, criminal charges under the Criminal Code of Canada are also possible.

The financial math is simple: the cost of a proper confined space entry program, training, equipment, permits, rescue capability, is a fraction of a single penalty. And the penalty is a fraction of the cost if someone gets hurt.

Practical Compliance Summary for BC Contractors

1. Identify every confined space on your site. Mark or secure those that do not require entry.
2. Write your confined space entry program, responsibilities, hazard assessments, and safe work procedures for each space.
3. Classify the atmosphere, low, moderate, or high hazard, determined by a qualified person.
4. Test the atmosphere within 20 minutes of entry. Re-test if all workers leave for more than 20 minutes.
5. Assign standby persons appropriate to the hazard level, immediate area for low, entry point for moderate, entry point plus rescue team for high.
6. Set up rescue capability, equipment, trained personnel, and practiced procedures specific to each space.
7. Issue entry permits when hazards require documented controls.
8. Lock out all energy sources and isolate adjacent piping.
9. Monitor continuously when the atmosphere may change or when >20% LEL may develop.
10. Keep records. Permits, test results, hazard assessments, training records, all required for audit and inspection.

For more on WorkSafeBC construction requirements beyond confined spaces, see our WorkSafeBC construction requirements guide.

Frequently Asked Questions