Why Installation Costs Vary So Much by State

The equipment cost for a Kohler or Generac standby generator is relatively consistent nationwide — a 20 kW Generac Guardian retails for $3,800–$4,400 regardless of where you live. But the total installed cost — which includes labor, the transfer switch, electrical work, gas line extension, concrete pad, and permits — varies by 40–60% depending on your state.

The primary drivers of regional cost variation are: electrician and plumber labor rates, permit fees, local code requirements, and the density of certified installers in your area. States with high labor costs (California, New York, Massachusetts) and states with limited installer networks (rural Mountain West states) tend to have the highest total installed costs.

National Average Installed Cost by Generator Size

Generator Size	Equipment Cost	Installation Cost	Total Installed (National Avg)
14 kW (Generac)	$2,800–$3,200	$3,500–$5,500	$7,000–$10,000
20 kW (Generac)	$3,800–$4,400	$4,000–$6,500	$9,000–$13,000
22 kW (Generac)	$4,200–$4,800	$4,500–$7,000	$10,000–$14,000
20 kW (Kohler)	$4,500–$5,200	$4,000–$6,500	$10,000–$14,500
26 kW (Kohler)	$5,800–$6,500	$5,000–$8,000	$13,000–$18,000
36 kW (Kohler)	$8,500–$10,000	$6,000–$10,000	$16,000–$22,000

Installed Cost by Region

Northeast (CT, MA, ME, NH, NJ, NY, PA, RI, VT)

The Northeast has the highest installed costs in the country, driven by high electrician labor rates ($95–$150/hour), strict permitting requirements, and high demand following major storm events (Sandy, Irene, various nor'easters). A 20 kW Generac installed in New Jersey or Connecticut typically costs $13,000–$18,000. Massachusetts and New York City are at the top of this range. Rural New England states (Vermont, Maine, New Hampshire) are slightly lower at $11,000–$15,000 due to lower labor costs, though installer availability can be limited.

Southeast (AL, AR, FL, GA, LA, MS, NC, SC, TN, VA)

The Southeast has moderate to high demand driven by hurricane season, combined with more competitive labor rates than the Northeast. Florida is the largest generator market in the US by volume, which has created a dense installer network and competitive pricing. A 20 kW Generac in Florida typically costs $10,000–$14,000. Georgia, North Carolina, and Virginia are in the $10,000–$13,000 range. Louisiana and Mississippi, with fewer certified installers, tend toward $11,000–$15,000.

Midwest (IL, IN, IA, KS, MI, MN, MO, NE, ND, OH, SD, WI)

The Midwest offers some of the most competitive installed pricing in the country, with strong installer networks in major metro areas and moderate labor rates. A 20 kW Generac in Ohio, Michigan, or Illinois typically costs $9,000–$13,000. Rural Midwest states (Iowa, Nebraska, the Dakotas) may be slightly higher due to fewer installers and longer travel times for service.

South Central (TX, OK)

Texas became one of the fastest-growing generator markets following Winter Storm Uri in 2021. Demand remains elevated, and installer lead times in Houston, Dallas, and San Antonio run 4–8 weeks during peak season. A 20 kW Generac in Texas typically costs $10,000–$15,000, with Houston and Austin at the higher end due to demand. Oklahoma is slightly lower at $9,000–$13,000.

West Coast (CA, OR, WA)

California has the highest installed costs of any state due to high electrician labor rates ($120–$180/hour), complex permitting requirements (especially in fire-prone areas), and strict air quality regulations that affect generator placement and operation. A 20 kW Generac in California typically costs $14,000–$22,000. Oregon and Washington are lower at $11,000–$16,000.

Mountain West (AZ, CO, ID, MT, NV, NM, UT, WY)

The Mountain West has moderate costs in urban areas (Denver, Phoenix, Salt Lake City) and higher costs in rural areas due to limited installer availability. A 20 kW Generac in Colorado or Arizona typically costs $10,000–$15,000. Rural Montana, Wyoming, and Idaho can run $12,000–$18,000 due to installer travel costs and limited competition.

What Is Included in the Installation Cost?

Cost Component	Typical Cost Range	Notes
Automatic transfer switch	$500–$1,500	Whole-home switch costs more than load-center switch
Electrical labor	$800–$2,500	Varies significantly by state and complexity
Gas line extension	$300–$1,500	Depends on distance from meter to generator
Concrete pad	$200–$600	Required by most codes; some use composite pads
Permits	$100–$800	Electrical + gas + mechanical permits vary by jurisdiction
Gravel/site prep	$100–$400	Depends on site conditions

How to Get the Best Price

Get at least three quotes from certified Kohler or Generac dealers. Prices for the same equipment and installation can vary by $2,000–$4,000 between installers in the same market. Ask each installer to provide an itemized quote that separates equipment cost, labor, transfer switch, gas line work, and permits — this makes comparison straightforward and prevents surprise add-ons.

Avoid purchasing a generator from a big-box retailer and then hiring a separate electrician for installation. Manufacturer-certified dealers typically offer better pricing on equipment (due to dealer discounts), handle all permitting, and provide warranty support that independent electricians cannot.

Frequently Asked Questions

What is the average cost to install a whole home generator?

The national average installed cost for a 20–22 kW whole home standby generator is $10,000–$14,000, including equipment, labor, transfer switch, gas line work, and permits.

How long does generator installation take?

A standard installation takes 1–2 days for the physical work. Permitting adds 1–4 weeks depending on your jurisdiction. Total time from purchase to operational generator is typically 3–8 weeks.

Does homeowner's insurance cover generator installation?

No — generator installation is not covered by homeowner's insurance. However, some insurance companies offer a discount of 1–5% on your premium for having a whole home standby generator, as it reduces the risk of water damage from frozen pipes and food spoilage claims.