How much does generator installation cost?
Setting up a home for a portable generator typically costs $1,500–$5,000, covering a manual transfer switch or interlock, a power inlet box, and wiring — plus the generator itself ($500–$2,500). A permanently installed standby system is a bigger job at $5,000–$18,000.
Ranges are typical planning guides — actual price varies by region, access, materials and your local pro. Always get a written quote.
| Item | Typical cost | Notes |
|---|---|---|
| Interlock kit + inlet, installed | $800–$1,500 | Cheapest safe hookup |
| Manual transfer switch (6–10 circuits) | $1,500–$3,000 | Pick which circuits run |
| Automatic transfer switch | $2,000–$5,000 | Hands-off switchover |
| Portable generator unit | $500–$2,500 | Bought separately |
What affects the price
Interlock vs transfer switch
An interlock kit on the main panel is the cheapest code-legal option. A dedicated transfer switch costs more but makes switchover simpler and can be automatic — the biggest fork in the price.
Circuits you want covered
Powering a few essentials (fridge, furnace, some lights) needs a small switch. Covering most of the house needs a larger switch, heavier inlet and thicker cable.
Portable vs standby
A portable hookup keeps cost down but you fuel and start the generator yourself. A standby unit starts automatically and runs on gas, but the installed price is several times higher.
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How much does generator installation cost?
A portable generator hookup with a transfer switch or interlock typically costs $1,500–$5,000 installed, plus $500–$2,500 for the generator. Standby systems run $5,000–$18,000 installed.
Can I just plug a generator into the house?
Not without a transfer switch or interlock — backfeeding through a dryer outlet is illegal and can electrocute utility workers. A proper inlet and switch is a half-day job for an electrician.
Is a transfer switch worth it over an interlock?
An interlock is cheaper and works fine for occasional outages. A transfer switch is worth it if you want labelled circuits, easier operation, or an automatic changeover.