Whole Home Generator Cost: The Direct Answer

A whole home standby generator costs $7,000–$25,000 installed in 2026, with the average homeowner paying $10,000–$16,000 for a 20–22 kW natural gas unit. Kohler generators run $500–$2,000 more than comparable Generac units. Installation — including labor, transfer switch, gas line work, permits, and site preparation — adds $3,500–$8,000 to the equipment cost.

Cost by Home Size

Home Size	Recommended Size	Low Estimate	Typical	High Estimate
Under 1,500 sq ft	10–14 kW	$7,000	$9,500	$13,000
1,500–2,500 sq ft	18–22 kW	$9,500	$13,000	$18,000
2,500–4,000 sq ft	22–26 kW	$13,000	$17,500	$23,000
Over 4,000 sq ft	26–38 kW	$17,000	$22,000	$28,000+

What's Included in the Installation Cost

The total installed cost of a whole home generator breaks down into five components. Understanding each one helps you evaluate quotes and avoid surprises.

1. Generator Equipment: $3,500–$15,000

The generator unit itself — the engine, alternator, and enclosure — is the largest single cost. A 14 kW Generac unit retails for approximately $3,800–$4,500. A 22 kW Kohler unit retails for approximately $5,500–$7,000. Prices vary by dealer and region; factory-authorized dealers typically offer competitive pricing with full warranty support.

2. Automatic Transfer Switch (ATS): $500–$1,500

The automatic transfer switch is the brain of the system. It monitors utility power, detects an outage within seconds, and automatically starts the generator and transfers your home to backup power. A standard 200-amp ATS costs $500–$900. Whole-house load management systems that prioritize critical circuits cost $900–$1,500. Most modern Kohler and Generac generators include an ATS in the package price.

3. Labor and Installation: $1,500–$4,000

Installation labor covers the physical placement of the generator, electrical connections, ATS installation, and system testing. Labor rates vary significantly by region — expect $75–$150 per hour for licensed electricians. A standard installation takes 8–16 hours. Complex installations involving long gas line runs, difficult electrical panel access, or concrete pad work take longer and cost more.

4. Gas Line Extension: $300–$2,000

Most whole home generators run on natural gas or liquid propane. If your home has natural gas service, the installer will run a dedicated gas line from your meter to the generator location. Short runs (under 20 feet) cost $300–$600. Longer runs or installations requiring trenching can cost $1,000–$2,000. LP installations require a dedicated propane tank, which adds $800–$2,500 for tank rental or purchase.

5. Permits and Site Preparation: $200–$1,000

Most jurisdictions require an electrical permit and inspection for generator installations. Permit fees typically run $150–$400. If your generator will be placed on a concrete pad (recommended for most installations), pad work adds $200–$600. Some HOAs require specific placement or screening, which can add cost.

Cost by State: How Location Affects Your Price

Labor rates are the primary driver of regional cost variation. States with higher costs of living — California, New York, Massachusetts, Connecticut — have labor rates 20–40% above the national average. Southern and Midwestern states tend to have lower labor costs. Here are typical installed costs for a 20 kW generator by region:

Region	Typical Installed Cost (20 kW)
Northeast (NY, CT, MA, NJ)	$14,000–$19,000
Southeast (FL, GA, SC, NC)	$11,000–$15,000
Midwest (OH, IN, IL, MI)	$10,500–$14,000
South (TX, LA, MS, AL)	$10,000–$14,500
West (CA, WA, OR)	$13,000–$18,000
Mountain (CO, UT, AZ, NV)	$11,000–$16,000

Factors That Increase Your Installation Cost

Distance from gas meter: Every additional 10 feet of gas line adds $50–$150 in materials and labor. Generators placed far from the meter or requiring underground runs are significantly more expensive to connect.

Electrical panel upgrades: Older homes with 100-amp service or outdated panels may require an upgrade to 200-amp service before a generator can be installed. Panel upgrades cost $1,500–$4,000 and add a day to the project timeline.

Concrete pad: While some installers place generators on composite pads, a poured concrete pad is more durable and often required by local codes. Expect $300–$700 for a standard generator pad.

HOA requirements: Some homeowners associations require specific generator placement, screening, or enclosures. Decorative screening or landscaping to conceal the unit can add $500–$2,000.

Is a Whole Home Generator Worth the Cost?

For most homeowners in outage-prone areas, a whole home generator is a sound investment. Consider these factors:

Power outage frequency: If your area experiences more than 2–3 significant outages per year, the convenience and protection value of a standby generator is substantial. A single extended outage can cost $1,000–$5,000 in spoiled food, hotel stays, and property damage (frozen pipes, sump pump failure).

Home value: Multiple studies have found that whole home generators add 3–5% to home resale value. On a $400,000 home, that is $12,000–$20,000 — potentially exceeding the installation cost.

Medical necessity: Households with medical equipment that requires power (oxygen concentrators, home dialysis, powered wheelchairs) have a clear safety imperative for backup power.

Remote locations: Homes in rural areas where utility restoration takes longer than average benefit most from standby generation.

How to Get the Best Price on Generator Installation

Get at least three quotes from factory-authorized dealers. Prices for the same unit can vary $1,500–$3,000 between dealers in the same market. Ask each dealer to itemize the quote — equipment, ATS, labor, gas line, permits, and pad work — so you can compare apples to apples.

Timing matters: spring and fall are slower seasons for generator installers, and you may be able to negotiate better pricing or faster scheduling. Avoid scheduling during hurricane season (June–November in the Southeast) when demand spikes and lead times extend to 6–12 weeks.