Estimator · Free

Whole-House Generator Installation Cost Calculator

Estimate standby generator installation cost by size, fuel type, and whether gas line work is included.

System configuration

Generator type and fuel

16–18 kW air-cooled, natural gas16–18 kW · Covers HVAC, refrigerator, lights, and well pump in a typical home.22–24 kW air-cooled, whole-house switch22–24 kW · The most common full-home backup configuration.22 kW plus new gas line extension22 kW · Gas line work is frequently the surprise cost on a first quote.Liquid-cooled 27–48 kW, large home27–48 kW · Required when simultaneous HVAC, pool, and kitchen loads exceed air-cooled capacity.Propane with new 250-gallon tank16–22 kW · Common where natural gas is unavailable.

Where

Metro area

Expected in Atlanta

$9,300–$15,500

Most homeowners pay around $12,500 for this configuration.

Typical installed price: $12,500
Generator size: 22–24 kW
Permits (electrical + gas): $398
Regional adjustmentAtlanta labor against national median: 0.99×

Installed price band
Point	Amount
Low end	$9,300
Typical	$12,500
High end	$15,500
Includes permits	$398

Not a DIY project

Standby generators require gas piping, high-amperage electrical work, and transfer switch integration inspected for utility safety. Manufacturer warranties require authorized installation.

What this assumes

Prices include generator, transfer switch, pad, electrical connection, and standard install labor.
Gas line extension and propane tank installs are additive scenarios, not included in baseline.
Manufacturer warranties require authorized installation.

Important

Standby generator installation involves gas piping, high-amperage electrical work, and transfer switch integration. This is not a DIY project — improper installation can injure utility lineworkers.

Understanding the result

Size the generator to your actual loads

A 22 to 24 kW unit handles most 2,000 square foot homes with central HVAC. A 16 kW unit works if you shed the HVAC compressor during an outage. Run a load calculation — do not guess from square footage.

Gas line work is the surprise cost

Natural gas units need adequate line capacity. Extending the gas line frequently adds $500 to $2,000 that does not appear on the generator quote itself. Propane requires a tank install or upgrade.

Common questions

How much does a Generac whole-house generator cost installed?

A Generac 22 kW air-cooled unit with a whole-house transfer switch typically runs $9,000 to $14,000 installed. Gas line extension adds $500 to $2,000.

What size generator do I need for a 2,000 square foot house?

A 22 to 24 kW unit handles most homes with central HVAC, well pump, and kitchen appliances. A 16 kW unit works if you shed the HVAC compressor during an outage.

You may also need

The next decision usually follows directly from this one.

Related trades

ElectricianInstall and maintain the power, lighting and control systems in homes, businesses and industrial plants.

Where to go next

Find a verified local professionalConsent-based listings with a visible verification date.