Do I need a permit for a sub panel installation?
Many areas require permits and inspections for new panels. Ask your local authority and your electrician which permits and inspections are included in the bid.
Service Guide
Sub Panel Installation
A sub panel is a smaller breaker panel fed from your main electrical panel to add circuits or serve a specific area like a garage, addition, or workshop. It can help organize loads and reduce crowding in the main panel when you add new appliances or spaces.
Typical rangeUS: $600 - $3,000
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Use this forCosts, questions, and project fit
What homeowners should know
A sub panel adds circuit capacity and shortens wire runs for areas that need several new circuits. It is connected to the main panel by feeder cables and distributes power to branch circuits in the area it serves. Homeowners often choose sub panels for additions, EV charging, shops, finished basements, or pools when the main panel still has adequate overall service capacity but lacks breaker space.
Safety and code basics matter. In a sub panel, neutrals and grounds are kept separate, and the neutral bar is isolated from the metal case. You also need clear working space in front of panels, commonly three feet, and proper wire sizes and grounding methods based on the feeder amperage and distance. Local permits and inspections may be required; ask your local authority.
Before booking, ask: Do I need a sub panel or a full service/panel upgrade? What amperage and number of spaces are recommended for future needs? How will grounding and neutral isolation be handled? What permits and inspections are included? How will feeder size and distance affect wire gauge, voltage drop, and cost?
When this service is needed
You are adding circuits for a garage, addition, finished basement, workshop, EV charger, or pool
The main panel has limited breaker space but your overall service capacity is still adequate
You want shorter wire runs and organized circuits for a specific area
You see frequent breaker trips when multiple appliances run and need more dedicated circuits
Repair vs replacement
Decide between adding a sub panel or upgrading the main panel. A sub panel is useful for moderate expansion when the main service has enough capacity but not enough breaker spaces. If your main panel is outdated, unsafe, or undersized for your total load, ask whether a main panel or service upgrade is the better option.
Within a sub panel project, scope choices include amperage (for example, 60A, 100A, or higher), number of spaces, panel location, and feeder route. More amperage and longer feeder runs require larger wire sizes and can increase cost. Ask your electrician to size the panel for future circuits and explain neutral-ground separation and grounding electrode needs.
Common problems to compare
Frequent breaker tripping or dimming lights when several appliances run
Overheating signs: burning smells, warm spots, discoloration, or scorch marks near panels
Outdated or unsafe panel equipment, limited spaces, or obsolete brands in the main panel
Loose or corroded conductors, rust, or moisture issues around electrical equipment
Planning mistakes: installing a sub panel when a full service/main panel upgrade is needed
Questions homeowners often ask
What affects the cost of a sub panel install the most?
Amperage and number of spaces, feeder distance and wire size, panel location and routing difficulty, and permit/labor costs are common drivers. More circuits and longer runs generally increase price.
How big should my sub panel be?
Size it for both current and near-future needs. Ask for a load assessment and consider extra spaces for planned circuits (workshop tools, EV charging, HVAC, or finished areas).
What safety rules are different in a sub panel?
Neutrals and grounds must be separate in the sub panel, with the neutral bar isolated from the metal case. Proper grounding and bonding are essential.
Where can a sub panel be installed?
Choose a dry, accessible location that allows required working clearances in front of the panel. Avoid spaces with moisture risks and confirm clearance requirements with your electrician.