Basement Electrical: Two Different Projects Under One Name
Are you looking at that unfinished space downstairs and wondering what it actually takes to power it up? Many property owners ask this exact question.
As a Toronto electrical contractor, we deliver safe, code-compliant basement electrical projects every single day. An expert plan is the secret to a smooth renovation.
Our team splits basement electrical work into two main categories. These two scopes might look similar on the surface.
The costs and code requirements, however, are completely different.
Finished Basement Renovation
You are finishing the basement for your own personal use. This includes spaces like a rec room, home gym, home office, or a kids’ play area.
The scope here is typical residential branch-circuit work. You usually need 8 to 12 receptacles, standard lighting, and maybe a wet bar or sump pump.
Sometimes, a project requires a 240V circuit for a sauna or workshop tool. We typically see the electrical portion of this work costing between $3,000 and $5,000.
Legal Basement Apartment (Secondary Suite)
You are creating a completely separate, legally rented unit. A full basement renovation for a suite in 2026 Toronto often costs $80,000 to $150,000.
The electrical scope is a major part of that budget. This project requires several specific additions to meet local bylaws:
- A separate unit kitchen with full code-required circuits.
- Separate laundry hookups.
- Interconnected smoke and carbon monoxide (CO) detection.
- Fire-rated penetrations between the unit and main house.
Our installations usually include a separate sub-panel for billing or service separation. You must follow full City of Toronto secondary-suite bylaw compliance.
The electrical portion alone typically runs $7,000 to $14,000. We handle both types of projects.
The information below focuses on the legal apartment scope. This is the more intensive project, and it is where most local property owners have questions.
Legal Basement Apartments in Toronto
Toronto actively encourages secondary suites to boost housing supply. Ontario’s Bill 23 makes adding these units to your property easier than ever.
The city’s secondary-suite bylaw and similar bylaws in North York, Scarborough, and Etobicoke define what a legal apartment looks like. Electrical compliance forms a massive chunk of those rules.
Our licensed electricians strictly follow the Ontario Electrical Safety Code (OESC). You need to meet several major requirements to pass your inspections.
Kitchen and Laundry Power Needs
Unit kitchens require heavy power to meet safety standards. They need at least two split-circuit countertop outlets.
You must install a dedicated circuit for a dishwasher, a dedicated microwave or microhood circuit, and a fridge circuit. Most living-area circuits also require Arc Fault Circuit Interrupter (AFCI) protection.
Unit-side laundry equipment demands its own power supply. You need a dedicated 240V dryer circuit and a separate 120V washer circuit.
HVAC, Smoke Detectors, and Fire Separation
Heat pumps or electric baseboards add significant load to your system. Mini-split installations always need a dedicated 240V circuit.
Interconnected smoke and CO alarms are a massive priority. Alarms in the unit and the main house living areas must be wired together.
If one alarm sounds, they all sound. We run this specific interconnect wire during the rough-in stage.
Fire separation is another critical safety factor. Any spot where an electrical cable passes through a fire-rated wall or ceiling needs special sealing.
Our team coordinates directly with your framing contractor. This guarantees the sealing system meets fire code requirements.
The Sub-Panel Advantage
Most legal apartments get a separate sub-panel. This setup is highly practical for tenant-billable separation if you plan on metering.
The building code also requires clear service separation between the rental unit and the main house. A standard 100A main panel simply lacks the breaker space for an entire kitchen, laundry, and HVAC scope.
| Sub-Panel Benefit | Why It Matters |
|---|---|
| Tenant Billing | Allows for clear separation of electrical usage if sub-metering is installed. |
| Code Compliance | Meets exact OESC rules for distinct service separation between units. |
| Breaker Capacity | Provides the physical space needed for the heavy 240V kitchen and laundry circuits. |
Rough-In, Inspection, and Final
The work happens in three distinct phases. These phases perfectly match your building permit inspection schedule.
An Electrical Safety Authority (ESA) permit typically costs between $200 and $800 in Ontario. A licensed contractor must pull this permit for you.
- 1. Rough-in (before drywall): Your electrician mounts boxes, runs cables, and installs the sub-panel. We also place the vital smoke and CO interconnect wire. An ESA rough-in inspection verifies all wiring before insulation or drywall closes the walls. You cannot skip this step.
- 2. During drywall: No active electrical work happens during this phase. Our electricians coordinate with the framing and drywall trades to handle penetration sealing.
- 3. Final: Your contractor installs devices, hangs fixtures, and completes the panel directory. We test AFCI and GFCI breakers using their self-test functions. The smoke and CO alarms are fully commissioned at this stage.
The ESA final inspection issues the Certificate of Acceptance. This certificate is the exact document the City needs to close your building permit.
It is also non-negotiable for your home insurance.
Bundling With a Panel Upgrade
About 60% of the legal apartment projects we do bundle an panel upgrade into the scope. The standard 100A main panel usually cannot support the new sub-panel feed alongside the existing main house load.
Sometimes, the existing main panel is an outdated brand like Federal Pacific or Zinsco. You simply cannot add new circuits to these older, unsafe models.
Bundling the work brings three massive benefits to your basement electrical renovation:
- Single Permit: You only pay for one ESA permit for the entire project.
- One Certificate: You receive a single Certificate of Acceptance for your records.
- Maximum Safety: Your sub-panel runs cleanly from a brand new 200A main service.
For North York and Scarborough post-war housing, this is almost always the right move. The original panels in these homes are simply too small.
Our pricing data shows that a panel upgrade costs the same whether you do it now or wait two years. The entire project, however, is significantly cheaper when bundled together today.
If you are ready to start planning your basement electrical project, reach out today.
We can walk you through the permit process and ensure your new space is completely code-compliant.
Taking the right steps now protects your home and your investment.
