Trade-Specific Licensing in Ontario

Who This Guide Is For

You've incorporated (Guide 1), registered with CRA (Guide 2), and set up your WSIB account (Guide 3). You have your corporation number, your Business Number, your HST account, and your WSIB clearance certificate. Now you need to figure out whether your specific construction activities require trade-specific licences, and if so, from which regulatory bodies.

Here's the thing most people get wrong: Ontario does not have a general "contractor's licence." There is no single licence that says "you are now allowed to do construction." Instead, certain trades and certain activities are regulated by specific bodies, each with their own requirements, exams, fees, and renewal schedules. If your work falls into a regulated category, you need that licence. If it doesn't, you don't.

This guide maps out every regulatory body and licensing requirement that applies to Ontario construction companies, so you know exactly what you need and what you can skip.

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The Regulatory Landscape: Who Regulates What

Ontario construction licensing is spread across multiple regulatory bodies. There is no one-stop shop. Here's the map:

Let's go through each one.

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Skilled Trades Ontario: Compulsory Trade Certification

How It Works

Ontario has 23 compulsory trades under the Building Opportunities in the Skilled Trades Act, 2021 (BOSTA). If a trade is compulsory, only people who hold a valid Certificate of Qualification (C of Q), a Provisional Certificate of Qualification, or a registered apprentice working under a Registered Training Agreement can legally perform that work.

This is about individual workers, not companies. Your corporation doesn't hold a trade certificate; your employees do. But as an employer, you are legally prohibited from employing or allowing anyone to perform compulsory trade work unless they hold the proper certification. If an inspector finds an uncertified person doing compulsory trade work on your job site, both you and the worker face penalties.

Construction-Related Compulsory Trades

Here are the compulsory trades that directly affect construction companies:

What This Means for Your Company

If you're starting an electrical contracting company: Every electrician on your crew must hold a 309A or 309C C of Q (or be a registered apprentice working under someone who does). You also need an ESA/ECRA electrical contractor licence (see next section) and at least one Master Electrician.

If you're starting a plumbing company: Every plumber must hold a 306A C of Q or be a registered apprentice.

If you're starting a general contracting company: You don't need trade certification yourself (general contracting is not a compulsory trade), but any worker on your crew who performs compulsory trade work must be certified. If you sub out all electrical and plumbing work to licensed subs, this is their problem, not yours. But if your own employees do any compulsory trade work, they must be certified.

If you're a general contractor who only does framing, concrete, drywall, painting, or other non-compulsory trades: You don't need any Skilled Trades Ontario certifications. Carpentry, painting, roofing, drywall finishing, tiling, and concrete finishing are all voluntary trades in Ontario, meaning anyone can legally perform this work.

Apprenticeship Ratios

If you employ apprentices, Ontario sets apprenticeship ratios, which determine the number of apprentices you can have per certified journeyperson. For most construction trades, the ratio is 1:1 (one apprentice per one journeyperson). Some trades allow higher ratios. Exceeding the ratio is a violation.

Verification

You can verify anyone's trade certification status through Skilled Trades Ontario's Public Register at skilledtradesontario.ca/public-register. Do this for every hire. If someone claims to have a C of Q, verify it before they start work.

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Electrical Safety Authority (ESA/ECRA): Electrical Contractor Licensing

If your company performs any electrical work in Ontario, you need an Electrical Contractor Licence from the Electrical Safety Authority (ESA), which administers the Electrical Contractor Registration Agency (ECRA) program.

This is a company-level licence, separate from your individual electricians' trade certifications. Even if every electrician on your crew has a 309A C of Q, the company itself needs an ECRA licence to legally contract for electrical work.

Requirements

To obtain an Electrical Contractor Licence, your company must:

1. Employ at least one Master Electrician (ME). This person must be employed by your company at all times. If your ME leaves, you must replace them or suspend electrical operations.

2. The Master Electrician must hold a valid ME licence, which requires:

   • A valid Certificate of Qualification in one of the electrical trades (309A, 309C, or Industrial Electrician 442A)
   • OR registration as a P.Eng. with PEO or a C.Tech. with OACETT
   • Passing the Master Electrician examination (within the previous 12 months at time of initial application)

3. Carry liability insurance: minimum $2,000,000 in public liability and property damage insurance

4. Be registered with WSIB (if required, which it is for construction)

5. Have filed returns with the Ministry of Finance and CRA. They check compliance.

6. Maintain a service address in Ontario

How to Apply

• Where: ESA's online Licensing Platform at esasafe.com
• Cost: Application fee approximately $400 (annual renewal approximately $300-$400)
• Processing: Typically 2-4 weeks after all documentation is submitted
• Renewal: Annual. Your licence must be renewed each year, and you must demonstrate continued compliance (valid ME, valid insurance, WSIB in good standing).

What You're Responsible For

Once licensed, your company must:

• Pull permits for all electrical work through ESA's online system
• Have work inspected by ESA inspectors before it's energized
• Use only certified electricians (309A, 309C, or registered apprentices under supervision)
• Display your ECRA licence number on vehicles, invoices, contracts, and advertisements
• Notify ESA of any changes to your Master Electrician, insurance, or company information

Penalties

Operating without an ECRA licence is an offence under the Electricity Act. Penalties include fines of up to $50,000 for individuals and $100,000 for corporations per offence. ESA actively enforces this, investigating complaints and conducting compliance audits.

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TSSA: Fuels, Elevators, and Pressure Vessels

The Technical Standards and Safety Authority (TSSA) regulates several categories of equipment and work that affect construction companies.

Gas/Fuel Systems Contractors

If your company installs, services, or repairs natural gas, propane, or oil-burning equipment (furnaces, boilers, water heaters, gas fireplaces, gas piping, etc.), you need:

1. TSSA Contractor Registration

• Your company must be registered with TSSA as a fuels contractor
• Where: tssa.org/licensing-and-registration
• Cost: Registration fees vary; approximately $300-$600 annually
• Requirements: Must employ properly certified gas technicians

2. Certified Gas Technicians on Staff

TSSA issues individual technician certifications at three levels:

Important 2026 change: Starting January 1, 2026, G3 certificate holders who earned certification through the challenge process must provide proof of 450 hours of G3 work experience before enrolling in a G2 program.

3. Oil Burner Technicians (OBT) If you work on oil-fired equipment, you need OBT certification, which has a similar structure to gas technician levels but applies to oil systems. Also regulated by TSSA.

Elevator Contractors

If your company installs, maintains, or repairs elevators, escalators, or lifts, you need:

• TSSA registration as an elevator contractor
• Certified Elevator Constructor mechanics on staff (this is a compulsory trade, designated 636T)
• Compliance with the Technical Standards and Safety Act and O. Reg. 209/01 (Elevating Devices)

This is a highly specialized field with significant barriers to entry. If you're starting an elevator company, you already know who TSSA is.

Pressure Vessel / Boiler Work

If your company works on pressure vessels, boilers, or compressed gas systems, TSSA regulates this through design registration, installation permits, and ongoing inspections. You'll need:

• TSSA registration
• Certified operators/mechanics as required by the Operating Engineers Regulation (O. Reg. 219/01)

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HCRA and Tarion: New Home Construction

If your company will build or sell new homes in Ontario (including detached houses, semi-detached houses, townhouses, or condominium units), you need two separate approvals from two separate bodies.

1. HCRA Builder/Vendor Licence

The Home Construction Regulatory Authority (HCRA) was established in 2021 to regulate the conduct of new home builders and vendors in Ontario. Every builder and vendor must be licensed by HCRA before they can offer, agree, or begin to build or sell a new home.

Who needs this:

• Anyone building new homes for sale (builder)
• Anyone selling new homes built by someone else (vendor)
• This applies to both freehold and condominium construction

Who does NOT need this:

• Contractors doing renovations only (not building new homes)
• Subcontractors working on new homes (the builder holds the licence, not each sub)
• Homeowners building their own home for personal use (owner-builder exemption, with conditions)

Requirements:

1. Competency requirement. First-time applicants must demonstrate knowledge and skills to operate a home building business and construct new homes. HCRA has an approved competency program.

2. Criminal Record and Judicial Matters Check. Required for all principal(s), directors, and officers.

3. Credit check. HCRA assesses financial responsibility through a third-party credit check.

4. Financial requirements. You must demonstrate adequate financial resources to build homes and honour warranty obligations.

5. Application and annual fees. Approximately $600-$800 for the initial application; annual renewal fees vary based on your volume of construction.

How to apply:

• Where: HCRA's Builder Portal at hcraontario.ca
• Processing: Average 8 weeks for a complete new application
• Important: You cannot offer, market, or agree to build or sell a new home until your licence is issued. This includes putting up "coming soon" signs or taking deposits.

2. Tarion Warranty Enrolment

Tarion Warranty Corporation administers Ontario's new home warranty program under the Ontario New Home Warranties Plan Act. Every new home built in Ontario must be enrolled with Tarion before construction begins, and the buyer receives statutory warranty coverage.

The process:

1. Qualification for Enrolment (QFE): Before you can enrol any homes, Tarion reviews your application and sets terms and conditions, typically including a security deposit (amount varies based on your financial position, experience, and the number/value of homes you plan to build). Security can range from $20,000 to hundreds of thousands, depending on your proposed volume.

2. Home enrolment: For each home or condominium project you plan to build, you must enrol it with Tarion and pay an enrolment fee before entering into a purchase agreement or beginning construction. Enrolment fees range from approximately $750 to $1,500+ per unit depending on dwelling type.

3. Warranty obligations: You are responsible for warranty coverage on each enrolled home:

   • 1 year: defects in work and materials, unauthorized substitutions, Ontario Building Code violations
   • 2 years: water penetration, defects in work/materials on electrical, plumbing, and heating systems, Ontario Building Code health and safety violations
   • 7 years: major structural defects

Cost impact: Between the HCRA licence, Tarion security deposit, and per-unit enrolment fees, new home building has a significant upfront capital requirement beyond the cost of land and construction. Budget accordingly.

2025 change: Starting July 1, 2025, homebuyers are encouraged to register their purchase with Tarion within 45 days. Starting April 1, 2026, buyers who register within 45 days of signing qualify for maximum deposit coverage, while late registrants may receive lower coverage. This doesn't directly affect you as a builder, but your buyers will be more aware of Tarion and more likely to file warranty claims.

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City of Toronto: Building Renovator Licence

This one catches people off guard. The City of Toronto (and only Toronto, not other Ontario municipalities) requires a Building Renovator Licence for anyone engaged in the business of altering, repairing, or renovating buildings or structures within the city.

Who Needs This

If you are a renovation contractor, general contractor, or specialty trade contractor performing renovation/alteration/repair work within the City of Toronto boundaries, you need this licence. This includes anyone who solicits for such work in Toronto, so even marketing your renovation services in Toronto without a licence is technically a violation.

Who Does NOT Need This

• Contractors working only outside Toronto (Mississauga, Brampton, Vaughan, Markham, etc. do not have this requirement)
• New home builders (covered by HCRA/Tarion instead)
• Contractors performing work that doesn't involve altering, repairing, or renovating buildings (e.g., site work, excavation, landscaping)

Requirements

1. All applicants, partners, officers, directors, and shareholders must be at least 18 years old

2. Trade examination. Applicants must pass an oral trade examination (administered in English; you may bring an interpreter). The exam tests knowledge of your trade and industry standards.

3. Application and fees. Approximately $200-$400 for the initial licence; annual renewal required.

4. Insurance. You must carry adequate liability insurance (City of Toronto specifies minimum requirements).

5. WSIB clearance. Must be in good standing.

How to Apply

• Online or in-person at the Licence and Permit Issuing Office, 850 Coxwell Avenue, 3rd Floor, Toronto
• Processing: Varies. Book the trade exam, pass it, then the licence is issued.
• Website: toronto.ca/services-payments/permits-licences-bylaws/building-renovators

Enforcement

Toronto Municipal Licensing & Standards enforces this. They conduct inspections and respond to complaints. Operating without a licence can result in fines and an order to stop work. Repeat offenders face escalating penalties.

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Ontario Building Code: Building Permits

Building permits are a licensing-adjacent requirement that every construction company must understand, even though they differ from a traditional "licence."

Under the Ontario Building Code Act, any construction, renovation, demolition, or change of use that affects the structural integrity, fire safety, health, or accessibility of a building requires a building permit issued by the local municipality. You don't need a permit to paint a room, but you need one for virtually everything structural, mechanical, electrical, or plumbing-related.

What You Need to Know

• Building permits are project-specific. You pull a permit for each job, not a blanket annual permit.
• The property owner is technically the permit applicant, but in practice, contractors often apply on behalf of the owner with proper authorization
• Permit fees vary by municipality and project scope, typically calculated as a rate per square metre or per $1,000 of construction value
• Inspections are required at various stages (footings, framing, insulation, plumbing rough-in, electrical rough-in, final). You cannot proceed past each stage without a passing inspection.
• Occupancy permits are required before a new building or major renovation can be occupied

Qualified Designers

For anything beyond minor renovations, the Building Code requires that drawings and specifications be prepared by a qualified designer: either a licensed architect (OAA), a professional engineer (PEO), or a person qualified under the Building Code Act (a BCIN holder, which stands for Building Code Identification Number).

If your company prepares its own drawings for permit applications, you need a BCIN-qualified designer on staff or retained as a consultant. BCIN registration is obtained through Humber College's examination program.

Why This Matters for New Companies

You won't get far in construction without understanding the permit process. Projects done without permits are a liability nightmare. They can't be insured, they can't pass a home inspection for resale, and the municipality can order demolition of unpermitted work. Always pull permits for work that requires them.

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Summary: What Licences Do You Actually Need?

Here's a quick-reference matrix. Find your company type and see which licences apply:

The pattern: If you're a general contractor who subcontracts all compulsory trade work to properly licensed subs, your own licensing burden is relatively light, consisting primarily of building permits and potentially the Toronto renovator licence. If you're a specialty trade contractor in a regulated field (electrical, plumbing, HVAC, new home building), you have trade-specific licensing on top of the universal requirements.

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What This Costs (Summary)

Some of these are zero for many companies. A general contractor doing commercial renovation in Mississauga needs: building permits (per project) and nothing else from this list. An electrical contractor in Toronto needs: ESA/ECRA licence ($300-$400/year), a Master Electrician, certified electricians on staff, and building permits per project. Know which ones apply to you and ignore the rest.

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Common Mistakes to Avoid

1. Assuming you need a "contractor's licence." Ontario doesn't have one. People waste time looking for something that doesn't exist. Your requirements depend entirely on what type of construction you do and where you do it.

2. Hiring uncertified workers for compulsory trade work. The penalties fall on the employer, not just the worker. If an inspector finds an uncertified person doing electrical or plumbing work on your site, you face fines, and the work may need to be ripped out and redone by a certified person.

3. Forgetting the Master Electrician requirement. You can't just get an ECRA licence and hire electricians. You must have a licensed Master Electrician employed by the company at all times. If they quit, you need a replacement immediately or you must stop doing electrical work.

4. Starting to sell new homes before your HCRA licence is issued. You cannot offer, market, advertise, or take deposits on new homes without an HCRA licence. HCRA actively monitors for unlicensed activity and can issue compliance orders and penalties.

5. Not checking subcontractor licensing. If you're a GC and your electrical sub doesn't have an ECRA licence, the work they do is technically illegal, and you could be held responsible for allowing unlicensed work on your project. Verify before they start.

6. Ignoring the Toronto renovator licence. Many contractors who work across the GTA don't realize that Toronto has a separate municipal licence requirement. The City of Toronto does enforce this, and getting caught without it can delay your project and result in fines.

7. Not budgeting for Tarion security deposits. First-time new home builders are often blindsided by the security deposit requirement. It can be tens of thousands of dollars, tied up for years. Factor this into your startup capital planning.

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What Happens Next

With your trade-specific licensing sorted, you've addressed all the regulatory requirements specific to your type of construction work. The next steps are universal, as every construction company needs them regardless of trade:

• Guide 5: Insurance: CGL insurance is your next mandatory requirement. Every project owner, GC, and client will demand proof of insurance before you start work. Many of the licences in this guide (especially ESA/ECRA) require insurance as a prerequisite.
• Guide 6: Safety Compliance: Ontario's safety requirements under the OHSA apply to all construction, plus there are construction-specific regulations that every company must follow from Day 1.