Electrical Subpanel
A secondary breaker panel fed from the main panel, used to extend capacity to garages, ADUs, or remote parts of a house.
Quick answer
Electrical Subpanel: A secondary breaker panel fed from the main panel, used to extend capacity to garages, ADUs, or remote parts of a house. Typical cost: $800–$2,500 installed depending on amperage and distance from main..
Why it matters
A subpanel is often cheaper than a full main-panel upgrade when you only need capacity in one area like a garage shop or addition.
Typical cost
$800–$2,500 installed depending on amperage and distance from main.
Pros
- • Cheaper than full panel upgrade
- • Localizes circuits for additions
Cons
- • Still constrained by main service size
- • Must follow strict grounding/bonding rules
Common uses
- • Garages, workshops, ADUs, finished basements
Alternatives
Main service upgrade
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Frequently asked questions
- Do I need a permit for a subpanel?
- Yes — and inspection is required for insurance and resale.
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Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.