Subpanel & Dedicated Circuit Installation in Lakewood, CO

Garage and Workshop Power

Garages with significant electrical demand, multiple outlets for power tools, lighting, electric heaters, EV charging, welders, air compressors, typically benefit from dedicated subpanels. A 60-amp or 100-amp subpanel in the garage provides the capacity for varied workshop use without overloading circuits shared with the main house. Subpanels also simplify wiring by providing local breaker access rather than running multiple circuits across the entire house.

Finished Basements

Finished basement remodels typically add significant electrical demand: bedrooms, bathrooms, kitchenettes, entertainment systems, possibly home offices or theaters. Rather than running 6-12 individual circuits from the main panel, installing a basement subpanel consolidates the feed and provides local breaker access. Particularly valuable when the main panel is full or distant from the basement.

Accessory Dwelling Units (ADUs)

ADUs, whether attached garage conversions, detached cottages, or basement units, typically have their own electrical needs (kitchen, bathroom, HVAC, lighting, multiple outlets) that warrant dedicated electrical infrastructure. A subpanel feeding the ADU provides clean electrical separation, supports separate metering for rental applications if desired, and simplifies maintenance.

Additions and Bonus Rooms

Home additions typically need new electrical work for the added space. A subpanel feeding the addition is often more practical than running individual circuits back to the main panel, particularly for additions on opposite sides of the house from the main panel.

Detached Structures

Detached garages, sheds, workshops, pool houses, and barns typically need electrical service. Underground feeder runs to a subpanel at the detached structure provide adequate capacity in a single installation, with the subpanel then serving outlets, lighting, and dedicated circuits at the destination.

Main Panel at Full Capacity

When your main panel has no available breaker spaces but you have remaining service capacity, a subpanel can expand the number of available breakers. The subpanel is fed from a single breaker in the main panel, and the subpanel itself contains multiple breaker slots for distribution. This is often less expensive than full main panel replacement when amperage isn't the limiting factor.

60-Amp Subpanels

Appropriate for smaller applications: detached sheds with lighting and a few outlets, small workshop areas, basic garage power. 60-amp subpanels are typically the minimum recommended size, smaller subpanels often run out of capacity sooner than expected as actual use develops.

100-Amp Subpanels

The standard size for most subpanel applications: significant garage power, finished basements, ADUs, additions, well-equipped workshops. 100-amp service is similar to the original main service of mid-century homes, enough for substantial loads in the area being served.

125-Amp or Larger Subpanels

Used for substantial installations: large ADUs with full kitchens and HVAC, well-equipped workshops with welders and high-power tools, detached structures with significant loads, or installations where future expansion is anticipated.

Four-Wire Feed (Not Three)

Modern code requires four-wire feeds to subpanels: two hot conductors, one neutral, and one separate ground. This is different from the three-wire feeds (no separate ground) that were sometimes installed historically. Subpanels with three-wire feeds typically need to be corrected during major electrical work, and new installations must use four-wire feeds to be code-compliant.

Separated Grounds and Neutrals

Inside a subpanel, the neutral and ground busbars must be separated and isolated, neutrals connect to the neutral busbar, grounds connect to the ground busbar, and the two are not bonded together at the subpanel (they bond together only at the main panel). This is essential for fault current path integrity and proper operation of GFCI/AFCI protection.

Feeder Wire Sizing

The feeder wire from the main panel to the subpanel must be sized for the subpanel's amperage rating and the run length. For a 100-amp subpanel within 50 feet, 3 AWG copper or 1 AWG aluminum is typical. Longer runs require larger wire to compensate for voltage drop. Conduit installations protect underground or exterior runs.

Grounding Electrode at Detached Structures

Subpanels in detached structures (separate garages, barns, ADUs) typically require their own grounding electrode (ground rod) at the subpanel location, in addition to the equipment ground conductor brought from the main panel. Specific requirements vary by code edition and local interpretation.

Dedicated circuits serve only one specific device and prevent other loads from sharing capacity. Modern code requires dedicated circuits for many specific appliances and uses:

Code-Required Dedicated Circuits

• Refrigerator (typically 15-20A)
• Microwave (typically 20A)
• Dishwasher (typically 20A)
• Garbage disposal (typically 20A)
• Laundry, washer (typically 20A)
• Bathroom, receptacles (typically 20A)
• Sump pump (typically 15-20A)
• Whirlpool/jetted tub (typically 20A)

Major Appliance Dedicated Circuits

• Electric dryer (240V, 30A typically)
• Electric range/cooktop (240V, 40-50A)
• Electric water heater (240V, 30A)
• Hybrid heat pump water heater (240V, 30A)
• Wall oven (240V, 30-40A)
• Furnace/air handler (typically 15-20A 120V or 240V dedicated)
• Central AC (240V, 30-50A depending on capacity)
• Heat pump (240V, 30-60A)

Specialty and Optional Dedicated Circuits

• EV charger (240V, 40-60A), discussed in detail on our EV charger installation page
• Hot tub (240V, 50-60A), discussed in detail on our hot tub wiring page
• Pool equipment, discussed in detail on our pool wiring page
• Workshop tools (welders, large air compressors, planers), typically 240V, varying amperage
• Sauna, typically 240V, 30-40A
• Standby generator transfer switch, discussed on our generator installation page
• Home office equipment requiring isolated power
• Medical equipment requiring uninterrupted power
• Aquariums with significant equipment loads
• Wine cellars with cooling systems

Beyond code requirements, dedicated circuits solve several practical problems:

• No nuisance breaker trips from simultaneous load, the microwave runs without affecting the refrigerator, the dishwasher runs without interrupting the disposal
• Better appliance performance, appliances receive full voltage without drop from shared loads
• Easier troubleshooting, when an issue occurs, the source is obvious
• Easier service, appliances can be safely disconnected without affecting other equipment
• Higher resale value, homes with proper dedicated circuits inspect better and serve modern buyers' expectations
• Capacity planning, adding dedicated circuits is the right way to expand electrical capacity rather than overloading existing shared circuits

• Licensed electrical contractor with full residential electrical capability, backed by 27 years of Colorado mechanical experience
• Multi-trade in-house team, electrical, plumbing, mechanical, and HVAC under one roof for integrated projects
• Established in 1998, over 27 years serving the Denver metro area
• Trusted by Denver Health, EPA Region 8, NREL, and the Denver Public Library
• Holds Colorado plumbing (P.C.0003362) and mechanical (M.P.00179722) contractor licenses
• BBB Accredited Business
• 24/7 emergency electrical service across the Denver metro area
• Free in-home estimates on installations, panel upgrades, and major projects
• Financing options available on qualifying installations
• Comprehensive permitting and inspection coordination, all work meets current NEC and Lakewood, CO-area code
• Coordinated installations for whole-home electrification, EV charging, and HVAC electrical work
• Same-team service and follow-up, no subcontractors juggling responsibility

How much does subpanel installation cost in Lakewood, CO?

60-amp subpanel installations within 30 feet of the main panel typically run $1,200-$2,200 installed. 100-amp subpanels in finished spaces typically run $1,800-$3,500. Longer runs, underground feeds, detached structures, or installations requiring trenching typically run $2,500-$5,000+. Pricing includes the subpanel, feeder wire, breakers, all required permits, and inspections.

How much does adding a dedicated circuit cost in Lakewood, CO?

Standard 120V dedicated circuit installations typically run $250-$500 per circuit. 240V dedicated circuit installations typically run $450-$800 per circuit. Pricing depends on wire run length, accessibility, and whether new breaker space is required in the panel. Multi-circuit projects performed together are more cost-effective per circuit than individual installations.

Can I have multiple subpanels in one house?

Yes. Larger homes routinely have multiple subpanels, main panel plus garage subpanel plus basement subpanel plus ADU subpanel. The main panel's service capacity limits total simultaneous load across all subpanels, but proper sizing accommodates this.

Will a subpanel reduce my main panel capacity?

No, but it allocates capacity. A 100-amp subpanel fed from your 200-amp main panel reserves up to 100 amps of capacity for the subpanel's loads. The remaining 100 amps remains available for direct main-panel loads. Total simultaneous draw across the entire home cannot exceed the main service capacity.

Do I need a permit for subpanel installation?

Yes. All subpanel installations and most dedicated circuit installations in Lakewood, CO-area jurisdictions require permits and inspections. MSI handles all permitting as standard practice.

How long does subpanel installation take?

Most subpanel installations complete in 1 day. Installations involving long feeder runs through finished walls, trenching for detached structures, or significant main panel work may take 2 days. We provide specific timeline estimates in writing with every quote.

Whether you are remodeling a basement, building an ADU, equipping a workshop, or adding specific dedicated circuits for appliances or specialty equipment, MSI provides licensed installation across the Denver metro. Call to schedule a consultation.