How Much Does a Home Generator Installation Cost?
Last updated: June 12, 2026 by the How Much Does That Cost? editorial team. Estimates are informational - see our methodology.
Installing a home standby generator costs between $4,250 and $11,900, averaging around $7,500 for a whole-home 16-20kW system with an automatic transfer switch. Generator size, fuel source, and how far the unit sits from your gas line and electrical panel are the biggest factors.
A budget-friendly portable generator with a manual transfer switch costs far less than a standby system, while larger homes with big electrical loads or complex site conditions can push whole-home standby installations well above $12,000.
Quick Answer
Typical range: $4,250 – $11,900
Low end
$2,500
High end
$18,000+
Actual pricing varies by location, project size, materials, labor rates, and job complexity. Use the calculator below for an estimate tailored to your project.
a Home Generator Installation Cost Calculator
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Estimated Project Cost
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Typical estimate: —
This is an estimate, not a quote. Actual pricing depends on your specific project details and local contractor pricing.
Cost Breakdown
How a typical project budget breaks down by category.
| Category | Estimated Cost |
|---|---|
| Generator unit | $2,000 – $6,500 |
| Automatic transfer switch | $500 – $1,200 |
| Labor & electrical | $1,200 – $2,800 |
| Gas line & concrete pad | $400 – $1,000 |
| Permit & inspection | $150 – $400 |
What Affects the Cost
Generator size (kW capacity)
Larger generators that can power your entire home, including HVAC, cost significantly more than smaller units designed to cover only essential circuits.
Fuel type
Natural gas and propane are the most common fuel sources for standby generators. Homes without an existing gas line may need one run to the generator location, which adds cost.
Automatic vs. manual transfer switch
An automatic transfer switch starts the generator and switches your home's power source within seconds of an outage, at added cost, while a manual switch requires you to start the generator and flip the switch yourself.
Distance to gas meter and electrical panel
The farther the generator sits from your gas meter and main electrical panel, the more gas line and wiring needs to be run, increasing labor and material cost.
Local permit and code requirements
Most municipalities require an electrical and sometimes a mechanical permit, and code often dictates minimum clearances from windows, doors, and property lines for generator placement.
Site preparation needs
A level concrete or composite pad is typically required for a standby generator, and additional site prep (like clearing landscaping) can add modestly to the total.
Cost by Generator Capacity
| Generator Capacity | Typical Cost |
|---|---|
| Portable (manual transfer switch), 5,000-10,000 watts | $2,200 – $4,500 |
| 16kW standby (partial-home backup) | $4,500 – $8,500 |
| 20kW standby (whole-home, average size) | $5,500 – $10,500 |
| 24-26kW standby (large home) | $7,000 – $13,500 |
| 30kW+ standby (very large home) | $9,000 – $18,000 |
DIY vs. Hiring a Professional
Doing it yourself
Installing a standby generator is not a realistic DIY project, since it involves connecting to a gas line and tying into your home's electrical panel through a transfer switch, both of which typically require licensed trades and a permit. A portable generator with a pre-installed manual inlet plug is a lighter-weight setup, but the inlet and interlock still should be installed by a licensed electrician.
Hiring a professional
A licensed electrician (often paired with a licensed gas fitter) sizes the generator to your electrical load, runs the gas line and wiring to code, and sets up the automatic transfer switch, typically completing installation in 1-2 days including permit inspection.
Bottom line: Hire licensed professionals for standby generator installation — the combination of gas line work, electrical panel connection, and code compliance makes this a job to leave to licensed trades.
Ways to Save
- Right-size the generator to your essential circuits (refrigerator, well pump, sump pump, some outlets) rather than the whole house to reduce the unit cost.
- Choose the fuel type that matches what you already have at your home — running a new gas line or propane tank adds cost if you don't already have one.
- Ask manufacturers and installers about seasonal rebates or bundled maintenance plan discounts.
- Get at least 3 quotes from licensed installers, since gas line and electrical labor costs vary more than the generator equipment cost itself.
- Consider a manual-transfer-switch portable generator setup if your budget is tight and power outages in your area are infrequent and short.
- Schedule installation in the off-peak season (spring) rather than right before hurricane or winter storm season, when demand and pricing both rise.
How We Estimated This Cost
We model each calculator from public price ranges, labor data, material pricing, industry surveys, and the regional adjustment method explained in our methodology. Estimates are reviewed for consumer usefulness, then shown as ranges because local quotes, site conditions, materials, and timing can change the final price.
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Frequently Asked Questions
How much does a whole-house generator cost installed?
The average whole-house generator installation costs about $7,500, with most homeowners paying between $4,250 and $11,900 depending on generator size and site complexity.
What size generator do I need for my house?
Most average-sized homes need a 16-20kW standby generator to power essential circuits and some or all HVAC equipment. A licensed electrician can calculate your exact load requirements based on your home's electrical panel.
How long does generator installation take?
A standby generator installation typically takes 1-2 days, including running the gas line, setting the concrete pad, wiring the transfer switch, and passing inspection.
Is a whole-house generator worth the cost?
For homeowners in areas with frequent or extended power outages, a standby generator is often worth the investment for food safety, home security, medical equipment needs, and general convenience.
Does a home generator run on natural gas or propane?
Most standby generators can run on either natural gas or liquid propane. Homes with existing natural gas service typically use it directly, while homes without gas service need a propane tank installed alongside the generator.