Dedicated circuit installation cost

A dedicated circuit is priced almost entirely by the hour: an electrician bills $80 to $180, typically $110, and a straightforward 20 amp, 120 volt circuit takes two to three hours plus the visit. The materials, a breaker, a box, a receptacle and a coil of 12 gauge cable, are a small part of the bill.

What moves the hours is the route. A panel in an unfinished basement directly below the outlet is the easy case. A panel at one end of the house, finished walls all the way, and no spare breaker slot is the expensive one.

What it costs

The comparison line is there for a reason. An outlet tapped off a nearby circuit is a short job priced as a unit. A dedicated circuit is a new run all the way from the panel, and it is quoted by the hours that run takes.

Which appliances need their own circuit

A dedicated circuit feeds one appliance or one location and nothing else. Some are required by the National Electrical Code, some by the appliance's installation instructions, which the code says must be followed, and some are simply good practice.

Required in most jurisdictions.

• Two 20 amp small-appliance circuits for the kitchen countertop outlets
• A 20 amp circuit for the laundry outlet
• A 20 amp circuit for the bathroom outlets
• A circuit for a furnace or other central heating equipment
• Under recent code editions, a 20 amp circuit for the garage outlets

Required by the manufacturer, which makes it required. Over-the-range microwaves, built-in microwaves, many dishwashers and garbage disposals, and most wall ovens and induction cooktops. The installation manual states the circuit, and an inspector reads it.

Good practice, and worth the money.

• A refrigerator or chest freezer, so a tripped outlet elsewhere does not spoil food
• A sump pump, for the same reason with higher stakes
• A window air conditioner over about 1,000 watts, or a large space heater
• A home office or gaming setup, a treadmill, or a workshop bench with a table saw

The test is simple. If an appliance draws a large share of a 15 or 20 amp circuit on its own, or if a nuisance trip would cost you something, give it its own circuit.

What the job actually is

The electrician runs one cable, called a home run, from a breaker in the panel to a single box, with no other outlets or lights along the way.

For a 20 amp circuit that is 12 gauge copper cable, a 20 amp breaker of the type the location calls for, a box, a 20 amp receptacle with the T-shaped neutral slot, and a cover plate. In a kitchen, laundry, garage, basement or bathroom the circuit needs GFCI protection. In most living spaces it needs arc-fault protection. Often both come from one combination breaker at the panel, which costs noticeably more than a standard breaker and is the main reason the parts bill varies.

The hours go into three places: getting the cable from the panel to the room, getting it into the wall where the box goes, and making up the panel end. The panel end is predictable. The route is not, and that is why two quotes for the same circuit can differ by a factor of two.

Most jurisdictions require a permit for a new circuit. Ask whether the fee is in the quote; it varies too much by city to state here.

What moves the hours

Distance and route. A cable can rarely go in a straight line. It follows joists, goes up through a top plate into the attic or down through a bottom plate into the basement, and comes back out where it is needed. Each change of level is a hole to drill and a fish to make.

What is open and what is finished. An unfinished basement or attic is where an electrician makes up time. A finished basement ceiling, a slab floor with no crawl space, or a two-story run with a finished room in between can triple the hours. In some houses the only honest route means opening a wall, which is billed as $300 to $1,500 per opening on top of the electrical work.

Exterior walls. Insulated exterior walls are slow to fish through, and fire blocking inside them stops a fish tape halfway.

Panel space. A spare slot makes the panel end a 20 minute job. A full panel means rearranging circuits, using tandem breakers if the panel is listed for them, or adding a subpanel. If the panel is full because the service is at its limit, no amount of rearranging solves it, and the conversation becomes a service upgrade at $1,500 to $6,000.

Plaster and old wiring. Lath and plaster cracks when it is drilled and does not patch invisibly. Old cloth-insulated wiring in the way slows everything down.

A worked example: a dedicated 20 amp circuit for a kitchen

A new over-the-range microwave whose manual calls for a dedicated 20 amp circuit. The panel has a spare slot. Two versions of the same house are priced: one with an unfinished basement under the kitchen, and one where the basement is finished and the cable has to come up through an interior wall.

Unfinished basement below, short run:

• Call-out fee: $100 to $250
• Labor: 2 to 3 hours × $80 to $180 per hour = $160 to $540
• Total: $260 to $790

Finished basement, cable fished through a closed interior wall:

• Call-out fee: $100 to $250
• Labor: 4 to 6 hours × $80 to $180 per hour = $320 to $1,080
• Total: $420 to $1,330

The breaker, cable and receptacle are on top of both, quoted at cost or with a modest markup. The circuit is the same in both houses; the difference of $160 to $540 against $320 to $1,080 in labor is entirely the route. If the electrician has to open the wall rather than fish it, add the patching.

Many firms quote a fixed price for this kind of job from a price book instead of hours. That is fine. Ask what route the fixed price assumes, because a fixed price built for the easy house is the one that gets revised on the day.

How to keep the hours down

Batch circuits. The visit, the permit and the panel work are shared. Two circuits on one trip cost far less than two trips, and three run through the same open basement ceiling less again.

Plan around a remodel. When walls are open for any other reason, a new circuit takes a fraction of the time. If a kitchen or laundry project is coming, put the circuits in the drawings rather than adding them after the drywall.

Clear the route. Empty the closets the cable passes through, move furniture away from the walls, and clear the attic hatch. Time spent moving boxes is billed at the same rate as time spent wiring.

Ask about the panel first. Send a photo of the open panel door with the quote request. An electrician who can see spare slots, or the lack of them, can quote accurately before arriving.

Frequently asked questions

Does a refrigerator need a dedicated circuit?

The code does not require one in most cases, and many kitchen refrigerators share a small-appliance circuit. A dedicated circuit is still good practice, because it means a tripped countertop outlet or a GFCI fault elsewhere cannot quietly switch off the fridge while you are away.

Can I put two appliances on one 20 amp circuit?

Sometimes. If neither appliance's instructions require a dedicated circuit and their combined draw stays well below the circuit rating, sharing is allowed. A microwave and a toaster oven on the same circuit is a classic source of nuisance trips.

How do I know if a circuit is already dedicated?

Switch off the breaker and check which outlets and lights go dead. If only the one outlet or appliance loses power, the circuit is dedicated. If half the kitchen does, it is not.

Is a dedicated circuit the same as a 240 volt circuit?

No. A dedicated circuit is any circuit that serves one load, and most are 120 volt, 15 or 20 amp. A 240 volt circuit for a dryer, range or car charger is also dedicated, but it uses heavier cable and a double-pole breaker, and it is a larger job.

Related guides

• Electrical outlet installation cost — adding to a circuit that already exists
• Electrical panel upgrade cost — when the panel has no capacity left for new circuits
• Appliance installation cost — what the delivery crew will and will not connect
• Electrician cost — the hourly rate behind every line here