When a subpanel is the right answer
A garage, workshop, addition or ADU may need several circuits near the new equipment. A subpanel can provide local distribution from a suitable feeder instead of separate long circuit runs. Whether it fits depends on the existing supply, planned loads, route and cost. We review those details before recommending it.
Sizing and feeder design
The part that matters most happens before anything is mounted. We calculate the load the subpanel will actually carry, check what spare capacity the main service has, and size the feeder conductors for the distance so voltage drop stays inside limits. A long run to a detached structure often needs larger conductors than the breaker size alone would suggest. We also work out the grounding and bonding arrangement, which is different for a detached building than for a subpanel inside the same structure, and is one of the details most often got wrong.
Detached structures
For a detached structure, review the proposed supply route, access, grounding and related construction. Some routes may involve trenching or opening finished surfaces. We identify that work before pricing and assess any existing installation before assuming it can be extended.
FROM OUR PROJECT PHOTOGRAPHS
Panel and lighting-control work
An open circuit-breaker panel is shown beside lighting controls and control enclosures in an electrical room. The photograph records the equipment arrangement during the work.
- Circuit-breaker panel
- Lighting controls
- Electrical room
Common questions
Do I need a subpanel or a bigger main panel?
They solve different problems. A subpanel adds circuit spaces and puts them near the work. A service upgrade adds total capacity. If your main service has spare capacity but no spare spaces, a subpanel is usually cheaper. If the service itself is maxed out, a subpanel will not help and we will say so.
Can a subpanel go in a detached garage?
Yes, and it is one of the most common reasons to install one. It needs a properly sized feeder, a trench and conduit along the route, and its own grounding arrangement. We work all of that out at the estimate stage so the price you see accounts for the trench rather than discovering it later.
How many circuits can I add?
That depends on the subpanel size and, more importantly, on what the circuits will carry. A workshop with a welder and a dust collector demands very different capacity from a garage with lighting and a couple of outlets. Tell us what equipment you plan to run and we will size it for that.
Technical planning notes & references
BEFORE WE QUOTE THE WORK
More breaker spaces do not create service capacity
Review the upstream supply
A subpanel distributes power from an existing source. Its feeder, protective device and loads must suit available capacity. Assess a workshop or addition alongside the service loads, rather than sizing it from empty breaker positions.
Specify the location and route
Length, voltage drop, clearances and exposure affect the design. Grounding and bonding arrangements depend on the installation. Include labels, testing, access and any trenching or surface repairs.