Standby generator cost by size (2026)
Typical installed price on natural gas with a whole-house automatic transfer switch, a pad, a 30 ft gas line and a permit, before state adjustment.
| Size | Low | Typical | High | Typically powers |
|---|---|---|---|---|
| 10 kW | $8,000 | $10,600 | $13,800 | Fridge, sump, furnace, lights, outlets |
| 14 kW | $8,800 | $11,500 | $14,800 | Essentials plus a small central AC |
| 18 kW | $9,600 | $12,400 | $15,800 | Most of a 2,000 sq ft home |
| 22 kW | $10,400 | $13,300 | $16,800 | Whole house up to about 3,000 sq ft |
| 26 kW | $11,200 | $14,150 | $17,800 | Large homes, multiple ACs with load management |
What an installation includes
- Generator: the air-cooled unit itself, usually about half the total cost.
- Automatic transfer switch (ATS): disconnects the house from the grid and switches to the generator. A whole-house 200 A switch costs more than a 100 A essential-circuits switch.
- Pad: most units sit on a composite pad; some codes require concrete.
- Gas line: priced per foot from the meter or propane tank. Many homes also need a larger gas meter from the utility, usually at no or low cost.
- Electrical work: wiring between the generator, switch and panel, and sometimes a panel upgrade.
- Permits: electrical, gas and sometimes zoning for placement near property lines.
Portable generator setup cost
A portable generator is the budget route. Beyond the generator, the safe way to connect it is a breaker interlock kit with an outdoor inlet box ($500–$1,200 installed) or a manual transfer switch ($900–$2,500 installed). Both let you power chosen circuits through a single cord without backfeeding the grid.
Running and maintenance costs
- A 22 kW standby generator burns roughly 200–300 cubic feet (about 6–8.5 cubic meters) of natural gas per hour at half load, or about 2 to 3 gallons of propane per hour.
- Standby units run a short self-test every week and need an annual service (oil, filter, spark plugs) costing $200–$450.
- Most standby generators last 15 to 25 years with regular maintenance.
Frequently asked questions
How much does a whole-house generator cost installed?
A 22 kW standby generator on natural gas typically costs $10,400 to $16,800, about $13,300 typical, installed, including the transfer switch, pad, gas line and permit. Propane with a new tank adds $1,500–$3,500.
How much does a 14 kW generator cost installed?
About $8,800 to $14,800 for a 14 kW standby unit with an automatic transfer switch, before state adjustment.
Is a standby generator worth it?
It is worth it where outages are frequent or long, or where someone depends on powered medical equipment, a sump pump or a well. For rare, short outages, a portable generator with an interlock kit costs a fraction as much.
How long does a generator installation take?
The installation itself usually takes one or two days. Permits, utility meter upgrades and inspections can stretch the whole project to several weeks.
Do I need a permit to install a generator?
Yes, almost everywhere. Standby generators need electrical and gas permits, and placement must meet clearance rules from windows, doors and property lines.
These estimates are for budgeting only. Final prices depend on the brand, distance to the panel and gas supply, and local rates.