How much does a whole-house generator cost installed in Connecticut?

A standby whole-house generator installed in CT runs $8,000 to $18,000 for a typical air-cooled Generac or Kohler system. An essential-circuits setup (10–14 kW) is $6,000 to $10,000; a true whole-home system (22–26 kW with a whole-home automatic transfer switch) is $12,000 to $18,000; large liquid-cooled units run higher. Every figure includes the transfer switch, electrical tie-in, permit, and inspection.

What size standby generator do I need?

Most CT homes are well covered by an 18–26 kW air-cooled unit. A 22–24 kW generator with a whole-home transfer switch runs essentially the whole house including central AC; a 10–14 kW unit on a managed or essential-circuits switch covers heat, well pump, fridge, and key outlets for less money. We size it from a load calculation, not a guess.

What drives the price of a generator install?

The biggest factors are: generator size in kW, fuel type (natural gas vs. propane — propane may need a tank, adding $1,500–$3,000), the gas line run and whether the meter or line needs upsizing, the transfer switch type (whole-home automatic vs. managed/essential-circuits), distance from the panel and gas source, and the concrete or composite pad.

Natural gas or propane for a standby generator?

If your home has natural gas, that is usually the simplest and cheapest fuel — no tank, unlimited runtime. If you are on propane or have no gas, we run it off a propane tank (owned or leased), which adds tank cost and means monitoring fuel during long outages. We confirm gas pressure and line size during the site visit.

Do I need a permit for a generator in CT?

Yes — a standby generator needs an electrical permit (and usually a gas/plumbing permit) plus inspection in Connecticut, and the transfer switch tie-in is coordinated with Eversource. We handle the permits, the gas line, the electrical, and the inspection end-to-end.

How long does a generator installation take?

Most residential standby installs are one to two days on site: set the pad and generator, run the gas line, wire the transfer switch and tie into the panel, then commission and test. Permit and inspection scheduling can add a few days to a couple of weeks depending on the town and gas utility.

Guide · Updated June 2026

Whole-House Generator Cost in Connecticut (2026)

A whole-house standby generator installed in Connecticut runs $8,000–$18,000 for a typical air-cooled Generac or Kohler system. An essential-circuits setup costs less; a full whole-home system with central AC on backup costs more. Every number below includes the transfer switch, gas line, electrical tie-in, permit, and inspection. Here’s the honest breakdown, written by Tyler Faye, a CT-licensed master electrician who installs standby generators across storm-prone Eastern Connecticut.

Generac & Kohler Gas Line + Electrical Permit & Inspection Storm-Season Ready

(860) 268-7972

Generator Cost at a Glance

Essential circuits (10–14 kW)

$6,000 – $10,000

Air-cooled unit on a managed or essential-circuits transfer switch — covers heat, well pump, fridge, and key outlets. Best value if you do not need central AC on backup.

Whole-home (18–22 kW)

$9,000 – $14,000

Runs most of the house including one AC system, on a whole-home automatic transfer switch. The most common Generac/Kohler choice for CT homes.

Full whole-home (24–26 kW)

$12,000 – $18,000

Larger homes, multiple AC zones, electric appliances — whole-home ATS, heavier gas and electrical work.

Large / liquid-cooled (32 kW+)

$18,000 – $30,000+

Estate-scale or all-electric homes needing a liquid-cooled unit and heavier service.

Installed prices in Connecticut, including the automatic transfer switch, gas connection, electrical tie-in, pad, permit, and inspection. Propane (vs. natural gas) may add $1,500–$3,000 for a tank.

What Drives the Price

Generator size (kW): Bigger units cost more and need a larger transfer switch and gas supply. Sizing comes from a load calculation — covering central AC roughly doubles the kW vs. essentials-only.
Fuel type: Natural gas is simplest and has unlimited runtime. Propane adds a tank ($1,500–$3,000) and fuel monitoring during long outages.
Gas line run & pressure: A long run from the meter, or a meter/line that needs upsizing to feed the generator, adds plumbing labor.
Transfer switch type: A whole-home automatic transfer switch costs more than a managed or essential-circuits switch — but backs up the whole house.
Distance & pad: Distance from the panel and gas source, plus the concrete or composite pad and any grading, affect labor.

Where the Money Actually Goes

Generator unit

$4,000 – $9,000

The air-cooled Generac or Kohler unit itself, sized to your load.

Transfer switch

$500 – $2,000

Managed/essential-circuits switch up to a whole-home automatic transfer switch.

Gas line & plumbing

$500 – $2,500

Running and connecting the gas line; more for long runs or meter upsizing.

Electrical, pad & permit

$2,000 – $4,500

Panel tie-in, pad, labor, permit, and inspection.

CT-Specific Considerations

Why CT homes buy standby power

Eastern Connecticut ice storms and nor’easters drop trees on overhead lines every season, and homes on well-and-septic lose water, not just lights, during an outage. That is why standby generators are one of our most-requested installs in wooded towns like Willington, Coventry, and Stafford.

Permits, gas & Eversource

A standby install needs an electrical permit (usually a gas permit too), inspection, and a transfer-switch tie-in coordinated with Eversource. We handle the gas line, the electrical, the permits, and the commissioning as part of our whole-house generator and generator installation service. Brand pages: Generac · Kohler.

Generator Cost FAQ

How much is a Generac whole-house generator installed in CT?+

A Generac air-cooled standby installed in Connecticut runs $8,000–$18,000 depending on size and transfer switch, including gas, electrical, pad, permit, and inspection. See our Generac installation page.

What size generator do I need?+

Most CT homes are covered by an 18–26 kW air-cooled unit. A 22–24 kW with a whole-home transfer switch runs the whole house including AC; a 10–14 kW on an essential-circuits switch covers heat, well pump, and fridge for less. We size it from a load calculation.

Natural gas or propane?+

Natural gas is simplest and cheapest if you have it — no tank, unlimited runtime. Propane adds a tank ($1,500–$3,000) and fuel monitoring during long outages. We confirm gas pressure and line size on the site visit.

Do I need a permit for a standby generator?+

Yes — electrical and usually gas permits plus inspection, with the transfer-switch tie-in coordinated with Eversource. We handle all of it end-to-end.

How long does installation take?+

One to two days on site: set the pad and unit, run the gas line, wire the transfer switch and tie into the panel, commission and test. Permit/inspection scheduling adds a few days to a couple of weeks.

Get a Generator Quote From TJF Electric

Tyler sizes the generator from an actual load calculation and quotes the all-in number — unit, gas, transfer switch, pad, and permit. Free same-day estimates across Willington, Vernon, Ellington, Manchester, Coventry, Storrs, and all Eastern CT. Want a ballpark first? Try the free generator cost calculator.

Call (860) 268-7972