How Much Does a Backup Generator Cost | Whole-Home Pricing

A backup generator costs $3,769 to $6,499 for the unit alone, but installed whole-home systems typically run $6,500 to $15,000+.

That gap surprises most homeowners, and it’s the single biggest mistake in budget planning. The price on the manufacturer’s page is just the machine sitting in a crate. The real cost — the one that shows up on the contractor’s invoice — includes transfer switch, wiring, concrete pad, permits, and labor. If you’re pricing a backup generator before a storm season, here’s the breakdown you actually need.

The Unit Price: What Generac Lists Today

Generac’s home standby generator page currently lists three residential units: $3,769, $4,619, and $6,499. These are the generator prices only — the bare equipment before anything is connected to your house.

What determines which price you land on:

• Wattage output — smaller units (around 11–14 kW) power just the essentials; larger units (20 kW+) handle more of the home.
• Fuel type — natural gas models connect to your existing line; liquid propane requires a tank and delivery schedule.
• Enclosure style — aluminum and composite housings cost more than steel but resist rust better in coastal or humid climates.

The lower-priced units keep the lights, fridge, and furnace running. The top-tier units come closer to whole-home coverage including central air or a well pump.

What Installation Actually Adds

The equipment is roughly half the story. That’s a big spread, and it comes down to site-specific work.

The line items that move the total:

• Automatic transfer switch — this is the device that senses an outage and switches your home off the grid and onto the generator. It’s not optional for standby systems and typically adds $500 to $2,000.
• Electrical panel work — older panels or ones with limited breaker slots often need a sub-panel or a service upgrade, which can run $1,000 to $3,000 alone.
• Concrete pad — the generator needs a level, stable base; pouring one runs a few hundred dollars.
• Permits and inspections — most jurisdictions require them; figure several hundred dollars.
• Fuel line connection — tapping into a natural gas line requires a licensed plumber or gas fitter.
• Labor — a licensed electrician’s time for a job this size is a meaningful chunk of the total.

Portable vs. Standby: Two Different Price Worlds

There’s a portable option that changes the whole conversation. Portable generators cost $400 to $1,500 and plug into individual appliances with extension cords, or connect to a manual transfer switch you flip yourself during an outage.

Portable units are dramatically cheaper, but they carry real trade-offs:

• They run on gasoline or propane you must store and refuel during extended outages.
• They power selected circuits, not the whole house — no central air, no electric water heater, no well pump.
• They require you to be home to start them and manage them through the outage.
• They must be run outdoors away from windows and doors, never inside a garage or basement.

A standby generator starts automatically within seconds of an outage and runs on your existing natural gas line with no refueling. That convenience is exactly what the extra $6,000 to $10,000 buys.

If you’re ready to see which systems fit your budget, our backup generator cost breakdown for homes compares the models worth buying at each price point.

What Most People Get Wrong When Budgeting

The most common mistake is comparing a unit-only price to an installed price as if they were the same figure. A $3,769 Generac isn’t a $3,769 project — it’s a $7,000 to $9,000 project once you add the transfer switch, pad, wiring, and labor.

The second mistake is assuming one price fits all homes. Cost changes sharply with kW output and whether you’re protecting a few circuits or the entire house. A larger whole-home system that powers central air, an electric range, and a well pump will push toward the $13,000 to $15,000+ end of the range.

Third, buying the generator alone doesn’t guarantee compatibility with your electrical panel. If your service size is too small or your panel is full, the upgrade work adds cost you didn’t plan for. A licensed electrician can tell you what your home needs before you commit to a specific unit.

FAQs

Does the generator price include installation?

No. The prices on Generac’s product pages cover the generator unit only. Installation adds transfer switch, electrical work, concrete pad, permits, and labor, which typically brings the total installed cost to $6,500 to $15,000+ for a standby system.

How much does a portable generator cost compared to a standby?

Portable generators run roughly $400 to $1,500 and handle a few circuits or appliances during an outage. Home standby generators cost $3,769 to $6,499 for the unit and $6,500 to $15,000+ fully installed, but they start automatically and power the whole house.

Can I install a standby generator myself to save money?

Professional installation is strongly recommended. Standby generators require electrical panel connection, a transfer switch, fuel line hookup, and permits — work that must be done by licensed electricians and gas fitters. DIY installation risks code violations, voided warranties, and safety hazards.