What is the cost of whole house generator installation?

Whole-house (standby) generator installation typically costs $5,000–$15,000 including generator, automatic transfer switch, labor, and often concrete pad and gas line. Size (kW) and brand drive the total.

Do I need a permit for generator installation?

Yes. Standby generators usually require electrical and sometimes gas permits. Portable generator connection via transfer switch may require a permit. The installer typically pulls permits.

How long does generator installation take?

Portable with transfer switch: half day to one day. Standby: 1–3 days including pad, gas, electrical, and commissioning.

What size generator do I need for my house?

Essential circuits only: 10–14 kW. Most of house (no AC or electric heat): 18–22 kW. Whole house with AC: 22–48 kW. A contractor can do a load calculation.

What is the difference between portable and standby generator?

Portable runs on gasoline; you plug in or use a transfer switch for selected circuits. Standby is permanently installed, runs on natural gas or propane, and can auto-start during outage.

Are there rebates for generator installation?

Some utilities or states offer rebates for standby generators or battery backup. Medicare/medical need may qualify for assistance. Check local programs.

How much does a Generac installation cost?

Generac (or similar brand) standby 22 kW installation typically costs $6,000–$12,000 including unit, ATS, labor, and pad. Regional and options vary.

Can I install a generator myself?

Portable generator use with a proper transfer switch can be installed by an electrician only; DIY connection is dangerous and often illegal. Standby must be installed by a licensed professional.

What is included in generator installation?

Standby: generator, automatic transfer switch, wiring, concrete pad (if needed), gas connection (if applicable), labor, permit, and startup. Portable: transfer switch and connection only.

How do I get the best generator installation quote?

Get 2–3 quotes. Specify same kW size and fuel (gas vs propane). Ask what is included (pad, gas line, permit). Compare total installed price and warranty.

How long do standby generators last?

Standby generators often last 15–25+ years with annual maintenance. Run them periodically per manufacturer guidelines.

What is an automatic transfer switch?

An ATS detects power loss and switches the electrical panel to generator power, then back when utility returns. Required for standby; optional for portable with a manual switch.

Does a generator add value to my home?

A standby generator can be a selling point in areas with frequent outages. It may not add dollar-for-dollar value but can make the home more attractive to buyers.

How much does it cost to run a generator?

Fuel cost depends on size and load. Natural gas standby: roughly $5–$20/day at moderate load. Portable gasoline: refill every 8–12 hours under load.

Generator Installation Cost Calculator

Use this free generator installation cost calculator to estimate cost by type (portable vs standby), size (kW), and transfer switch. Portable setups run $500–$1,500; standby $5,000–$15,000+. Get a low, average, and high estimate below.

How much does generator installation cost?

Generator installation in the U.S. typically costs $500–$15,000+: portable with transfer switch $500–$1,500, standby 18–22 kW $5,000–$10,000, large standby $10,000–$15,000+. Get 2–3 local quotes for an accurate price.

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These estimates are based on current market data and average costs. Actual costs may vary depending on your location, specific materials chosen, contractor rates, and project complexity. We recommend getting multiple quotes from local contractors for the most accurate pricing.

Average Generator Installation Cost

National averages run $500–$15,000+. Final cost depends on type and size.

Cost by type (installed)

Typical total ranges

Type	Estimated cost
Portable + transfer	$500–$1,500
Standby 10–14 kW	$3,000–$5,500
Standby 18–22 kW	$5,000–$10,000
Standby 24–48 kW	$10,000–$15,000+

Cost factors

What drives the total

Factor	Impact
Concrete pad	$300–$800
Gas line (if needed)	$500–$2,000

What Affects Generator Installation Cost?

Type & size — Standby and higher kW cost more than portable.
Transfer switch — Automatic (ATS) adds cost vs manual.
Pad & gas — Concrete pad and gas line add $500–$2,000+.
Labor — Typically 45–50% of total; varies by region.

Data from contractor quotes

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Generator Installation Cost FAQs

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Disclaimer: Estimates are for planning only. Actual costs depend on size, fuel, pad, and local rates. Get 2–3 written quotes.