← Electrical Advice & Planning
A detached garage or backyard workshop needs an electrical plan based on its intended use, available supply and distance from the house. A few lights and a garage-door opener create a different project from a heated workshop with large tools and EV charging.
For Toronto, GTA and Simcoe homeowners, planning before excavation and interior finishing helps coordinate electrical work with the building, driveway and landscaping.
Start with an equipment list
List the equipment you expect to use now, plus realistic future additions. Include lighting, door openers, heating or cooling, battery chargers, compressors, dust collection and larger stationary tools.
Provide model information and electrical ratings where available. Explain which equipment operates together. A table saw and dust collector, for example, should be discussed as a working combination rather than unrelated items on a shopping list.
Review the supply before choosing a panel
The electrician needs to assess the existing home’s electrical capacity and the proposed garage loads. Empty spaces in the house panel do not establish how much additional equipment the service can support.
Ask whether the planned use calls for individual circuits or a feeder and garage panel. The answer depends on the load assessment, installation conditions and applicable requirements. A larger garage panel alone does not increase the capacity available from the house.
Coordinate the route before excavation
Review the distance between buildings and proposed cable route with the contractor. Driveways, patios, tree roots, retaining walls and future construction can affect access and restoration.
Before digging, arrange the required utility locates. ESA also distinguishes privately owned underground wiring, such as a garage supply, which may require a private locate. Do not assume a utility locate identifies every buried cable on the property.
Have the contractor specify the installation method, routing and inspection sequence. Avoid selecting a trench depth or cable size from a generic online example.
| Information to provide | What it helps plan |
|---|---|
| Tool models and simultaneous use | Circuit and supply requirements. |
| Heating and future EV charging | Present and future capacity review. |
| Site plan and outdoor obstacles | Routing, excavation and restoration. |
| Workbench and storage layout | Useful receptacle and lighting positions. |
Design the room around actual work
Position receptacles around benches and equipment so everyday use does not depend on extension cords across the floor. Include charging shelves, overhead door equipment and exterior tasks in the discussion.
Plan general lighting and task lighting together. Consider where a parked vehicle, raised door or tall shelving may block light. Agree on switching locations before wall finishes are installed.
Describe dampness, an unheated interior, vehicle movement and other conditions that affect equipment selection and protection.
Leave a practical path for future work
If an EV charger or larger tool is likely, discuss that now. Appropriate spare raceway or an accessible route may be useful, but it must be planned for the intended installation.
Separate the cost of future capacity from the cost of future access. Keeping a route available does not guarantee that the existing service will support every later addition.
Agree on the complete project scope
Clarify who handles excavation, backfill, surface repairs, electrical notification and inspection coordination. Where inspection is required before wiring is concealed, build that step into the construction schedule.
Common questions
Can an existing garage circuit simply be extended?
It needs assessment first. The existing circuit’s condition, capacity and new loads determine whether that is suitable.
Should I buy the garage panel first?
Have the supply and circuit design reviewed before purchasing equipment.
Explore Electric FX electrical renovation services or send us your garage plans and equipment list.
Further reading: ESA guidance on powerlines and underground locates; ESA notifications and inspections.