How Much Does a Home Backup Generator Actually Cost in 2026?
Home backup power runs from a few hundred dollars for a battery box to five figures for a permitted, hard-wired standby generator. Here’s what each option costs in 2026, what it actually powers, and which house-connection pieces add to the bill.
The Brofessionals is reader-supported. When you buy through links on this page we may earn a small commission at no extra cost to you. As an Amazon Associate we earn from qualifying purchases. See our full disclosure.
“How much does a backup generator cost?” is really four questions, because “backup generator” covers a battery power station, a portable gas or inverter generator, a portable wired into your panel through an interlock or transfer switch, and a permanent automatic standby unit. Each step up costs more and powers more.
This guide is research-based. We haven’t priced every option by collecting quotes ourselves; the numbers below come from manufacturer list prices and national cost guides, each linked in the sources with the date we checked it.
The Quick Answer: Cost by Backup Option
| Option | Typical cost (September 2026) | Install / connection | What it realistically runs | Electrician + permit? |
|---|---|---|---|---|
| Portable power station (battery) | About $500–$550 for a 1 kWh-class unit like the Anker SOLIX C1000 Gen 2 (October 2026), up to about $2,799 on sale ($3,699 regular) for a 4 kWh EcoFlow DELTA Pro 3 | None; plug devices in | Fridge, lights, phones, CPAP, internet for hours; big units add 240V loads | No (unless wired to the panel) |
| Portable gas or inverter generator | $500 to $2,500 (HomeGuide); a Honda EU2200i lists at $1,199 | None; extension cords | A few appliances via cords | No |
| Portable + interlock kit or manual transfer switch | Generator cost + $400 to $850 (interlock, installed) or $400 to $1,300 (manual transfer switch, installed) | Inlet box outside, interlock or switch at the panel | Selected house circuits, including hardwired items like a well pump or furnace | Yes, in most areas |
| Automatic standby (whole-house) | $6,000 to $11,000 installed on average (HomeGuide); Angi lists $5,000 to $21,000 for 22 to 48 kW units | Pad, gas line, automatic transfer switch, permit, inspection | Most or all of the house, starting automatically | Yes, always |
If you only need to keep food cold and phones charged through a one-day outage, the first two rows cover you. If outages in your area last days, or someone at home depends on powered medical equipment, a well pump or sump pump, the bottom two rows are where the real decision is.
Standby Generator Prices by Size
For whole-house standby units, size drives the equipment price. The table below uses Generac’s “starting at” MSRPs from its standby lineup page (September 2026). The installed range is our arithmetic: the MSRP of the version bundled with a transfer switch plus HomeGuide’s $3,000 to $5,000 national labor range. It is a planning number, not a quote, and it excludes propane tanks, panel upgrades and long gas runs.
| Size (LP rating) | Generac unit only (MSRP) | Generac with transfer switch (MSRP) | Rough installed range |
|---|---|---|---|
| 10 kW | $3,649 to $3,769 | $4,619 | $7,600 to $9,600 |
| 14 kW | $4,569 to $4,889 | $5,389 to $5,949 | $8,400 to $10,900 |
| 18 kW | $5,379 to $5,709 | $6,229 to $6,769 | $9,200 to $11,800 |
| 22 kW | $6,119 to $6,309 | $6,979 to $7,369 | $10,000 to $12,400 |
| 26 kW | $6,989 to $7,159 | $7,899 to $8,219 | $10,900 to $13,200 |
Other brands land in a similar band. Kohler lists MSRPs of $3,946 for its 10RESV, $5,098 for the 14RCA, $6,016 for the 20RCA and $7,546 for the 26RCA, and notes that final pricing is set by the dealer. Champion’s 14 kW aXis unit bundled with a 200A automatic transfer switch was about $4,999 at Norwall in September 2026.
For the full line-by-line version (transfer switch, pad, gas line, meter, electrical, permit and inspection), see our itemized Generac install cost breakdown.
Connecting a Portable to Your House: the Middle Option
The biggest value jump for many homes is not a standby unit. It’s a portable generator you already own, connected properly to a few house circuits. There are three ways people do this, and only two are legal and safe.
- Interlock kit. A sliding plate on your main panel that makes it physically impossible to have the main breaker and the generator breaker on at the same time. HomeGuide puts it at $400 to $850 installed. It’s the cheapest way to run hardwired loads, but you manage which breakers are on. Our interlock kit vs. transfer switch guide covers the trade-offs.
- Manual transfer switch. A small subpanel with pre-selected circuits. HomeGuide lists $400 to $1,300 installed. It’s simpler to operate during an outage, but it only covers the circuits you picked at install.
- Backfeeding with a double-male cord. Never do this. The CPSC says plugging a generator into a wall outlet is “extremely dangerous” and puts utility line workers and neighbors at risk of electrocution.
Which One If…
- You rent or live in an apartment: a power station. No fumes, no permits. See our best power stations for apartment dwellers.
- Outages are short and rare: a portable inverter generator or a mid-size power station, run through extension cords. Check what size generator runs a fridge and freezer before you buy.
- You need a well pump, furnace or sump pump: a portable plus an interlock or manual transfer switch, installed by an electrician. This is usually the best dollars-per-circuit value.
- Multi-day outages, hurricanes, or medical needs, and nobody should have to go outside in a storm: an automatic standby unit.
Still torn between a battery and a gas unit? Our power station vs. generator vs. UPS comparison walks through it.
Don’t Forget Fuel and Upkeep
Standby units burn a lot of fuel under full load. Generac’s spec sheet lists its 22 kW air-cooled unit at 311 cubic feet per hour of natural gas or 3.71 gallons per hour of propane at full load. Worked example: a 500-gallon propane tank is normally filled to about 80%, or roughly 400 gallons. At 3.71 gallons per hour, that’s around 108 hours of full-load running, and more at the partial loads most homes actually draw. That is why homes on propane often size the tank around the generator, and why HomeGuide lists $1,000 to $2,500 to install a 500-gallon tank if you don’t have one.
On natural gas, output drops a bit: Generac rates the 22 kW at 21 kW on natural gas and the 26 kW at 24 kW. Your gas utility may also need to upgrade the meter to handle the added load (see the itemized page).
Plan on maintenance too. HomeGuide puts annual standby maintenance at $200 to $650 per year, or $20 to $110 for DIY kits. Portables need fresh or stabilized fuel; a carburetor gummed up by old gas is the most common no-start. Here’s our fix for a generator that won’t start after sitting.
Why Prices Vary by Region
- Permit fees are local. Houston charges a small electrical permit fee scaled by kW plus a $33.56 administrative fee, with plan review and inspection required. PermitMint lists $150 to $800 for a whole-house standby permit in New York City. One Georgia installer reports $50 in small towns and $200 or more in Atlanta.
- Labor rates follow local wages. HomeGuide lists electricians at $50 to $130 per hour nationally; urban and coastal markets sit at the high end.
- Demand spikes with storms. Interest and installer backlogs build during hurricane season (June 1 to November 30). Getting quotes and permits started in late winter or spring usually means shorter waits.
Portable vs. Standby at a Glance
Pros
- Portable/battery: no permits or electrician if you use cords; works the day you buy it
- Portable/battery: doubles for camping, job sites or tailgating
- Standby: starts automatically within seconds of an outage, even if you’re not home
- Standby: covers most or all of the house, including central AC on larger units
Cons
- Portable gas: you have to set it up, refuel it and keep it well away from the house because of carbon monoxide
- Portable: limited to what cords or a handful of interlock/transfer-switch circuits can carry
- Standby: highest upfront cost by a wide margin, plus yearly maintenance
- Standby: expect weeks, not days, once you add quotes, permitting and inspection
Check Portable Inverter Generator on Amazon → Check Portable Power Station Home Backup on Amazon →
Sizing for the whole house rather than one appliance? Use our whole-house generator size calculator.
FAQ
Read next: Generac Install Costs in 2026 (Itemized) · Interlock Kit vs Transfer Switch · Can You DIY a Standby Generator Install? · all generator guides
Sources
- Generac: Home Standby Generators: starting MSRPs for 10 to 28 kW models, with and without transfer switch
- Generac 22 to 28 kW air-cooled spec sheet: natural gas ratings and full-load fuel use
- Kohler Home Generators: MSRPs for 10RESV, 14RCA, 20RCA, 26RCA
- Norwall: Champion 14 kW aXis + 200A ATS: retail price
- Honda EU2200i: MSRP and output
- EcoFlow DELTA Pro 3: price, capacity and output
- HomeGuide: generator cost (updated Dec. 30, 2025): installed standby, portable, labor and maintenance ranges
- Angi: generator installation cost (updated Sept. 1, 2026): cost by type and size
- HomeGuide: transfer switch cost: interlock and manual/automatic switch ranges
- HomeGuide: propane tank installation cost: 500-gallon tank range
- CPSC safety alert: portable generator hazards: backfeeding warning and outdoor placement
- Houston Permitting Center: generator permit: fee structure and master-electrician requirement
- PermitMint: NYC generator permit (verified May 2026): NYC permit fee ranges
- Premier Generators: permit costs: Georgia and Tennessee permit examples
Checked September 2026. Prices and specs change; confirm on the linked pages before you buy.
