Most garage and workshop spaces are under-wired for serious tool use. A single 15-amp circuit shared with the garage door opener and overhead light cannot support a table saw. Planning your electrical needs before setting up the workshop prevents tripped breakers, undervoltage damage to motors, and frustrating interruptions.

Important: Any new circuits, subpanel installation, or work inside the breaker panel should be performed by a licensed electrician. This article helps you plan what you need so you can communicate effectively with the electrician.

Workshop Electrical Setup

Assessing Your Current Electrical

Start by identifying what you have:

Check your breaker panel for circuits labeled “garage” — note their amperage
Count the outlets in the workshop space
Test each outlet to confirm they work and are properly grounded
Note which outlets share a circuit (plug a lamp into one, flip breakers until it goes off, then check which other outlets also lost power)

What You Need

Minimum Setup (Light Use)

Two dedicated 20-amp, 120V circuits for power tools
One 20-amp circuit for lighting
GFCI protection on all outlets

Recommended Setup (Regular Woodworking)

Two to four 20-amp, 120V circuits for general tool outlets
One 20-amp circuit dedicated to the dust collector
One 20-amp circuit for the workbench area
Separate lighting circuit
GFCI protection throughout

Full Workshop Setup

30 to 60 amp subpanel dedicated to the workshop
One or two 240V circuits for a table saw, planer, or welder
Four to six 20-amp, 120V circuits for outlets
Dedicated lighting circuit
240V compressor circuit (if applicable)

Outlet Placement

Bench level outlets: Install outlets every 4 feet along the wall behind the workbench at 42 to 48 inches above the floor. This puts them above the bench surface for easy access.

Floor level outlets: Standard 12-inch height outlets for stationary tools against walls.

Ceiling outlets or drop cords: For tools in the center of the shop that would otherwise require extension cords stretched across the floor. A retractable cord reel mounted to the ceiling is the cleanest solution.

Dedicated outlets for stationary tools: The table saw, miter saw, and dust collector each benefit from a dedicated outlet on their own circuit.

Lighting Layout

Overhead lighting: LED shop lights are the current standard — energy-efficient, long-lasting, and available in the ideal 4,000 to 5,000K color temperature. Plan two 4-foot LED fixtures per 100 square feet of workshop space.

Task lighting: Under-cabinet LED strips over the workbench provide shadow-free lighting on the work surface. Adjustable-arm task lights illuminate specific areas for detail work.

Natural light: If possible, add or enlarge windows. Natural light improves mood, color accuracy, and the overall workshop experience. Even one skylight makes a dramatic difference in a garage shop.

GFCI Protection

Building codes require GFCI protection for all outlets in garages and unfinished spaces. You have two options:

GFCI outlets: Install GFCI receptacles at each location
GFCI breaker: Install a GFCI breaker in the panel that protects the entire circuit

GFCI breakers are more convenient because they protect all outlets on the circuit from a single point. However, nuisance tripping from motors (especially dust collectors and compressors) can be frustrating. Discuss this with your electrician.

Subpanel Considerations

If your workshop needs multiple new circuits, installing a subpanel in the garage is often more cost-effective than running individual circuits back to the main panel. A 60-amp subpanel with 12 to 16 spaces provides room for current needs and future expansion.

The subpanel feeds from the main panel via a single large cable. Individual circuits branch out from the subpanel to the workshop outlets and lights. This simplifies the wiring, reduces conduit runs, and gives you a convenient local disconnect.

Planning for the Future

Even if you do not need 240V capability today, having the subpanel in place makes adding it later straightforward. A 240V circuit for a table saw or planer is a common eventual need.

Run at least two more circuits than you think you need today. The cost difference during installation is minimal, but adding circuits after the fact is expensive.

What to Tell Your Electrician

Prepare this information:

Your shop layout drawing with tool positions
The voltage and amperage requirements for each major tool (from the tool’s nameplate or manual)
The number and location of outlets you want
Your lighting plan
Whether you want 240V capability now or in the future

A well-planned electrical setup is the backbone of a functional workshop. Do it right from the start, and you will never be limited by your power supply.