Sub Panel Installation in Myrtle Beach, SC
A real assessment before the number, a written price before anything opens, and a permit filed as part of the job.
How much does sub panel installation cost in Myrtle Beach, SC?
An indoor subpanel near the main panel runs $900 to $2,400 in Myrtle Beach; a subpanel for a detached garage or workshop, which needs trenching and a new grounding rod, runs $2,500 to $6,000.
The gap between those two numbers is almost entirely trenching and wire run distance, not the subpanel itself. A 60-foot underground run costs meaningfully more than a 10-foot indoor one, even with the same panel on both ends.
What a Subpanel Actually Does
A subpanel is a smaller breaker panel fed from your main panel, giving a specific area (a garage, a workshop, an addition, a rental unit) its own local set of breakers instead of running every circuit back to the main box.
The main service isn't replaced or upsized for this job; the subpanel simply taps into spare capacity your main panel already has. That's an important distinction from a 200-amp upgrade: if your main panel doesn't have spare capacity to give, a subpanel alone won't solve the problem, and the electrician will tell you that upfront rather than install one that starves the rest of the house.
For a detached structure, this is also the practical alternative to running dozens of individual circuits back to the house one at a time: one feeder cable goes out, and the subpanel handles distribution locally from there.
What's Included
- Main panel capacity checkConfirms there's genuinely enough spare capacity to feed a subpanel before any trenching starts.
- Feeder cable and disconnectA detached structure requires its own disconnect switch at the subpanel, sized to the feeder.
- Trenching and conduit (detached structures)The underground run from the main structure to the subpanel location, buried to code depth.
- Grounding rod at the subpanelA separate grounding electrode is required at a detached structure's subpanel, not just a bond back to the main panel.
- Permit and inspectionFiled and scheduled as part of the job with whichever desk covers your address.
When a Subpanel Is the Right Call
- You're wiring a detached garage, workshop or she-shedThe most common reason for this service, and the one that involves the most site work (trenching, conduit, a new grounding rod).
- An addition is walled off from easy access to the main panelA local subpanel avoids running a long individual circuit for every outlet and fixture in the new space.
- You're renting out a unit and want local disconnect capabilityA tenant or short-term rental guest can access their own subpanel without needing access to the main service.
- A pool, hot tub or outbuilding needs its own dedicated circuitsA subpanel keeps those circuits organized and locally accessible rather than crowding the main panel.
How Sub Panel Installation Works
- 01
Main panel capacity check
Confirms there's spare capacity before anything else gets scoped or priced.
Time on site: 30–45 minutes - 02
Permit filed
Required for any subpanel installation in this market.
Time on site: before install day - 03
Trenching and feeder run (detached structures)
The underground conduit run from the main structure to the subpanel location.
Time on site: half a day to a full day - 04
Subpanel mounting and connection
Panel mounted, disconnect installed, grounding rod driven, circuits terminated.
Time on site: 3–6 hours - 05
Inspection
Scheduled with the local permit desk once work is complete.
Time on site: scheduled after install
Finished stateA locally accessible breaker panel with its own disconnect and grounding, fed from confirmed spare capacity on the main service.
Permits, HOA Sign-Off and the Rental Case
A subpanel requires a permit in every jurisdiction here, the same as main-panel work. If it serves a rental unit or condo, exterior conduit runs and any new disconnect equipment sometimes need HOA or association sign-off before the permit will move — a real, checkable extra step in Market Common, Grande Dunes and other HOA-governed communities, not a formality to skip.
What a Subpanel Costs in Myrtle Beach, SC
USD
- Indoor subpanel, near main panel$900–$2,400per subpanelShort run, no trenching. Common for a laundry room, addition or interior workshop.
- Detached garage or workshop subpanel$2,500–$6,000per subpanelIncludes trenching, underground conduit, feeder cable and a new grounding rod.
- Trenching (underground run)$10–$25per linear footThe distance from the main structure to the subpanel is the single biggest cost driver on a detached job.
- Grounding rod at the subpanel$200–$500flatRequired by code at any detached-structure subpanel; not optional.
These are typical ranges for Grand Strand; your exact price is confirmed in writing after the main panel capacity check and a measured distance to the subpanel location.
Adding a subpanel during a main-panel upgrade visit is usually cheaper than scheduling it separately later — see the 200 amp panel upgrade page.
Sub Panel Installation in Myrtle Beach, SC — questions
Yes, in every jurisdiction across this market. It's filed the same way as main-panel work, and the inspector will check the feeder run, the disconnect and the new grounding electrode, not just the panel itself.
That depends on how much spare capacity your main panel already has. This is the first thing an electrician checks, before anything gets trenched or scoped, because if there's no spare capacity, a subpanel alone won't solve the problem.
Not always, but it's common for short-term rentals and multi-unit properties where local disconnect access matters, or where a unit's circuits need to be clearly separated from the rest of the property.
There's no fixed maximum distance in the code itself, but cost rises directly with distance because of trenching and larger feeder-cable gauge on longer runs. Most detached-garage subpanels in this market run 20 to 100 feet from the main panel.
An indoor subpanel near the main panel runs $900 to $2,400. A detached garage or workshop subpanel, which needs trenching and a new grounding rod, runs $2,500 to $6,000.
Related services
- L-100all panel services/services
- L-101200 amp panel upgrade/services/200-amp-upgrade
- L-107electrical panel relocation/services/panel-relocation
- N-02the full panel upgrade cost guide/guides/panel-upgrade-cost
- A-CHEsubpanels for dock and boat-lift wiring in Cherry Grove/service-areas/cherry-grove
- W-001get a sub panel installation quote/contact
Licensed, insured panel upgrades, breaker box replacement and meter base work for Myrtle Beach and Horry County.
- 01Licensed & insuredEvery job is performed by a licensed, insured electrician working to South Carolina electrical code.
- 02Fixed written pricingThe number you see after the load calculation is the number you pay. It doesn't move once the panel's open.
- 03Permits handledThe permit gets filed and the inspection gets scheduled as part of the job, not left for you to arrange.
- 04One focused serviceThis is a panel-focused practice, not a full-service electrical shop. That means less guessing on this one job type, not more upsell.
Request a quote
Tell us what your panel looks like now (age, brand if you know it, any breaker trouble) and we'll call back with next steps.
Ready for a written price?
A quick main-panel capacity check settles whether a subpanel is even possible before you plan the rest of the project around it.