How much does it cost to install a whole house generator?

A whole-house standby generator costs $8,000–$15,000 installed for a typical air-cooled 14–22 kW unit. This includes the generator ($4,000–$7,000), the automatic transfer switch ($800–$2,500), electrical and gas-line work ($3,000–$5,500), a pad ($300–$800), and permits. Liquid-cooled units for large or all-electric homes run $18,000–$30,000 installed.

How much does it cost to install a portable generator hookup?

Installing a safe portable generator hookup costs $400–$1,200 for a manual transfer switch, or $150–$600 for an interlock kit, plus electrician labor. The interlock kit is the most economical code-compliant option. This is a one-time cost that lets you safely power home circuits rather than running extension cords.

Why is standby generator installation so expensive?

Standby installation cost is driven by four factors beyond the unit itself: the automatic transfer switch ($800–$2,500), electrical work to tie into your panel ($1,500–$3,000), gas-line extension to fuel the generator ($500–$2,000 depending on distance), and a concrete or composite pad ($300–$800). Permits and inspection add several hundred more. Labor alone often equals or exceeds the generator's price.

Does generator installation require a permit?

Yes — standby generator installation requires electrical and often mechanical (gas) permits in nearly all jurisdictions, plus a final inspection. A licensed electrician handles the electrical permit; a licensed gas plumber may handle the gas permit. Reputable installers include permit fees in their quote. Skipping permits risks insurance and resale problems.

Can I install a generator myself to save money?

You can place a portable generator and use its outlets yourself, but any connection to your home's wiring — transfer switch, interlock, or standby — must be done by a licensed electrician to be code-compliant and safe. Backfeeding through an improper connection is illegal and can electrocute utility workers. The labor cost buys both safety and code compliance.

How long does generator installation take?

A portable transfer-switch or interlock installation takes a few hours. A standby generator installation typically takes 1–2 days of on-site work once permits are approved, though the full timeline from order to operational can be 4–10 weeks including permitting, gas-line scheduling, and inspection.

What size generator do I need before getting installation quotes?

Determine your required wattage first — it determines the unit price, transfer switch amperage, and electrical work. Use our generator size calculator to get an exact kW figure, then request quotes for that size. This prevents installers from upselling an oversized unit and gives you an apples-to-apples basis for comparing bids.

Generator Installation Cost

Generator Installation Cost by Type

Type	Unit	Install	Total
Portable (no transfer switch)	$400–$1,500	$0	$400–$1,500
Portable + manual transfer switch	$700–$1,500	$400–$1,200	$1,100–$2,700
Portable + interlock kit	$700–$1,500	$150–$600	$850–$2,100
Standby 10–14 kW (air-cooled)	$4,000–$5,500	$3,500–$6,000	$8,000–$12,000
Standby 18–22 kW (air-cooled)	$5,000–$7,000	$4,000–$7,000	$10,000–$15,000
Standby 22 kW+ (liquid-cooled)	$8,000–$15,000	$6,000–$12,000	$18,000–$30,000

What Drives Generator Installation Cost

The Transfer Switch

Every standby generator and every safe portable hookup needs a transfer switch. For standby systems, the automatic transfer switch (ATS) costs $800–$2,500 depending on amperage and features like load management. Consequently, this single component is often the largest line item after the generator itself.

Electrical Work

Tying the generator and transfer switch into your main panel requires a licensed electrician, typically $1,500–$3,000. Furthermore, if your panel needs upgrading to accommodate the generator, costs rise. This labor is non-negotiable — it's what makes the installation safe and code-compliant.

Gas-Line Extension

Standby generators run on natural gas or propane, so a fuel line must reach the unit. The cost ranges from $500 to $2,000 depending on distance from your gas meter and whether the line needs upsizing for the generator's flow demand. Therefore, placing the generator near the gas meter reduces this cost.

Pad, Permits, and Inspection

A composite or concrete pad ($300–$800) supports the generator. Additionally, electrical and gas permits plus a final inspection add several hundred dollars. Reputable installers include these in their quote; be wary of bids that exclude them to appear cheaper.

How to Get Accurate Installation Quotes

First, determine your required generator size using our generator size calculator — this fixes the unit price and transfer-switch amperage. Then request at least three quotes from licensed electricians who are authorized dealers for your preferred brand. Finally, confirm each quote includes the unit, ATS, all electrical and gas work, the pad, permits, and first-year service, so you're comparing complete numbers rather than stripped-down teasers.

Frequently Asked Questions

Generator Installation Cost — Full Breakdown

Key Takeaways