Sub-Panel Installation in Las Vegas & Henderson
Need power in the garage, workshop, addition, or detached structure? A sub-panel adds dedicated capacity fed from your main panel — sized, wired, and inspected to code by licensed electricians. Common across Henderson and Las Vegas for RV garages, casitas, and home workshops.
When Does Your Home Need a Sub-Panel?
A sub-panel extends your electrical system to areas where running individual circuits from the main panel is impractical — garages, workshops, ADUs, casitas, and additions that need multiple circuits in one location. It is not a full service upgrade, but it requires NEC load calculations, correctly sized feeder wire, a main breaker in the sub-panel, and permits in Las Vegas or Henderson.
Southern Nevada homeowners often install sub-panels when converting a two-car garage for an EV charger plus workshop tools, when building a detached guest casita in Inspirada or Cadence, or when finishing a basement addition where the main panel is on the opposite side of the house. Running six individual branch circuits across a 80-foot attic crawl is expensive and hard to maintain — a single feeder to a local sub-panel is the standard approach.
Before any sub-panel install, we verify your main panel has enough spare capacity and breaker spaces for the feeder. If the main service is already maxed out, a sub-panel alone will not help — you may need a panel upgrade or service increase first. Penny Electric calculates load honestly and will tell you upfront if the main panel is the bottleneck.
This work is part of our complete electrical panel services for Las Vegas and Henderson homes and businesses — licensed, permitted, and code-compliant.
Reasons to Install a Sub-Panel
Garage or workshop power
Tools, EV charging, compressors, and HVAC mini-splits need dedicated circuits near the load — a garage sub-panel keeps feeder runs short and organized.
Home addition or ADU
New living space in Henderson or Las Vegas needs a local panel for kitchen, bath, and HVAC branch circuits without overloading the main breaker.
Adding high-draw equipment
Workshop machinery, kilns, welders, or multiple EV circuits in one area exceed what a single branch circuit can supply safely.
Detached structure
Guest house, studio, barn, or pool house fed from the main home — one underground or overhead feeder to a sub-panel is code-compliant and inspectable.
Adding power to a garage or addition? We'll calculate load and quote upfront.
What Sub-Panel Installation Includes
- Sub-panel installation (indoor or outdoor rated as needed)
- NEC load calculation for feeder and main panel
- Dedicated branch circuits from sub-panel
- Feeder wiring from main panel (copper, correctly sized)
- City or county permit and inspection
- Grounding and bonding per current code
Part of our electrical panel services — see also panel upgrades, panel replacement, and residential electrical services.
Sub-panel cost in Las Vegas depends on feeder distance, trenching or conduit requirements for detached structures, amperage (30A to 100A+ feeds are common), and whether the main panel needs a new breaker slot or service upgrade first. Garage installs in attached structures are typically less than detached casitas requiring underground conduit. We quote after measuring the run and calculating load — not from a flat online estimate.
Why Penny Electric
A licensed electrical contractor, not a handyman
Sub-panel and feeder work is permit-required — Penny Electric holds NV Contractors License C-2 #74758 for load calculations, panel work, and inspection-ready installs.
Load calculation before we wire
We verify main panel capacity and size the feeder correctly. No guessing on wire gauge or breaker rating — NEC-compliant from the first plan.
Upfront pricing before work begins
Sub-panel projects vary widely by distance and amperage. You get an itemized quote after site measurement, not a phone estimate that changes on install day.
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Trusted by Las Vegas and Henderson homeowners for garage, workshop, and ADU electrical — from Inspirada casitas to Summerlin RV garages.
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How It Works
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01
Assess Load
We calculate demand for the new area, confirm main panel has capacity and breaker space for the feeder, and plan the wire route — attic, conduit, or trench for detached structures.
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02
Install & Wire
We install the sub-panel, run the feeder from the main panel, add branch circuits, and bond/ground per code. Permits filed with the city or county before rough-in inspection.
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03
Inspect & Done
We coordinate final inspection, label all circuits, and verify breakers and outlets before handoff. You receive documentation for HOA or future EV/appliance adds.
Sub-Panel Installation FAQ
What's a sub-panel for?
A sub-panel distributes power to a remote area — garage, workshop, casita, or addition — fed by a dedicated feeder circuit from your main panel. It gives you local breaker control without running every branch circuit back to the main box.
Do I need a sub-panel for my garage or workshop?
If you need multiple circuits in the garage and the main panel is far away or full, a sub-panel is often the cleanest solution. A single EV charger might only need one dedicated circuit; a workshop with tools, lighting, and AC usually needs a sub-panel.
Sub-panel vs. panel upgrade?
A sub-panel adds distribution to a specific area; a panel upgrade increases total home capacity — see our panel upgrades page if your main service is the bottleneck.
Is a permit required?
Yes — sub-panel and feeder installations require permits and inspection in Las Vegas, Henderson, and Clark County. Penny Electric pulls permits and schedules inspection as part of the project.
How much does sub-panel installation cost in Las Vegas?
Attached garage sub-panels often run a few thousand dollars depending on amperage and circuit count. Detached structures cost more when trenching, conduit, and longer feeder runs are required. Main panel upgrades add to scope if capacity is insufficient. We quote after on-site assessment.
What size sub-panel do I need?
Common residential sub-panels are 60A, 100A, or 125A depending on planned load — EV charger plus general garage circuits often needs 60–100A. We size the feeder and main breaker based on NEC load calculation, not guesswork.
Can a sub-panel go in my garage?
Yes — garage sub-panels are one of our most common installs in Las Vegas. We use appropriate enclosure ratings for the location and keep clearances per code for safe access.
Sub-panel for a detached casita or ADU?
Yes — we install sub-panels for detached guest units, pool houses, and workshops across Henderson and Las Vegas. Underground conduit or overhead feeder routes are planned to meet code and pass inspection.
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Contact Us
Fax: (702) 586-3771
Phone answered at our Henderson main office.
Henderson Office (Main Office)
1987 Whitney Mesa Dr
Henderson, NV 89014
All staff, reception, and personnel.
Las Vegas Service Facility
3645 W Oquendo Rd Unit E
Las Vegas, NV 89118
Equipment and parts hub only
Hours
- Mon - Fri: 7AM - 5PM
- Saturday: By appointment
- 24 Hr Emergency Service