Generator Installation Cost: Labor, Pad, Gas & Electrical
Installing a home standby generator typically costs $3,500 – $8,500 in labor and materials on top of the unit itself, covering the gas hookup, the transfer switch, the electrical tie-in, the pad, and permits. If you already own the generator or are buying it separately, this page breaks down exactly where that installation money goes.
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| Line item | Typical range | Notes |
|---|---|---|
| Electrical work and wiring | $1,500 – $4,000 | Licensed electrician: panel tie-in, conduit, grounding |
| Transfer switch (installed) | $800 – $2,500 | Automatic switch, often bundled with the unit |
| Gas line or fuel hookup | $500 – $2,500 | Distance from the meter and pipe sizing drive this |
| Concrete or composite pad | $300 – $1,000 | Level base with service clearance |
| Permits and inspection | $100 – $500 | Set by your jurisdiction |
| Crane or set fee (large units) | $0 – $1,500 | Only for liquid-cooled or tight-access sites |
| Generator type | Install labor and materials | On-site time |
|---|---|---|
| Air-cooled standby (10 – 26 kW) | $3,500 – $8,500 | The common residential range |
| Liquid-cooled standby (32 kW+) | $7,000 – $15,000 | Heavier set, larger gas line, more wiring |
| Portable with inlet hookup | $700 – $1,800 | Interlock or transfer switch plus inlet box |
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What the installation price actually covers
When a contractor quotes installation, they are pricing five distinct jobs: connecting the gas (or propane) supply, setting and wiring the transfer switch, running conduit and wire between the generator and your panel, building or placing a level pad, and pulling permits with a final inspection. On an air-cooled unit, those tasks add up to roughly $3,500 – $8,500 even when you have already paid for the generator separately. A portable unit instead uses a simpler generator hookup at a fraction of that, and sizing the unit first with our generator sizing guide keeps you from over-buying.
The single largest line is usually the electrical work, $1,500 – $4,000, because it involves a licensed electrician, the transfer switch wiring, grounding, and the connection into your service panel. The gas hookup is the second swing factor: a generator sitting ten feet from the meter might cost $500 to connect, while a long trenched run with upsized pipe can reach $2,500.
Why two quotes on the same unit differ by thousands
The generator is a catalog price. The installation is site work, and site work varies enormously. The distance from the pad to the gas meter, the distance to the electrical panel, whether the panel has room for the transfer switch, the soil and access for trenching, and local code clearances around windows and AC condensers all move the labor number.
A quote that comes in $3,000 higher than another is usually not padding. It often reflects a longer gas run, an older panel that needs work alongside the install, or a placement that forces conduit around the house. Ask every contractor to itemize the five jobs above so you can compare the actual scope rather than a single bundled figure.
Buying the unit separately vs a turnkey package
Some homeowners buy the generator from a retailer or online and hire an installer for the labor only. That can work, but verify two things first: that your installer will warranty work on a unit they did not supply, and that buying separately does not void the manufacturer warranty, which sometimes requires installation by an authorized dealer. Generac and Kohler both tie certain warranty terms to authorized installation.
A turnkey dealer package folds the unit, transfer switch, and labor into one number, typically $9,000 – $16,000 for a common 22 – 24 kW air-cooled system, the figure our whole house generator cost page details. A Generac install is the common version of that package. Splitting the purchase can save on the equipment markup, but you lose the single point of accountability if something goes wrong between the unit and the install.
Permits, inspection, and the timeline
Nearly every U.S. jurisdiction requires a permit for a standby generator because the work touches both gas and the electrical service. Permit and inspection fees usually run $100 – $500. The gas connection and the transfer switch tie-in legally require licensed trades, so an unpermitted install is both a code violation and an insurance problem.
The on-site work is typically one to two days once the unit is on hand. The full timeline, including the site survey, permit approval, utility coordination for the gas meter, and the final inspection, generally spans two to six weeks depending on how busy your local building department is.
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