Generator Installation Cost in NJ — At a Glance
| Item | Typical Range |
|---|---|
| 7–10 kW generator (small home, natural gas) | $3,500 – $5,500 |
| 14–20 kW generator (avg. home, natural gas) | $5,000 – $8,000 |
| 22–26 kW generator (large home, whole-home) | $7,000 – $12,000 |
| Transfer switch (automatic) | $500 – $1,500 |
| Electrical installation & labor | $1,000 – $2,500 |
| Gas line extension (if needed) | $300 – $1,500 |
| Permit fees (NJ, varies by municipality) | $100 – $400 |
| Propane tank installation (if no gas line) | $1,000 – $3,000 |
Prices vary by generator brand, model, site conditions, and local permit fees. The figures above reflect typical NJ installations in 2025. Get a free on-site estimate for your specific home.
6 Factors That Affect Your Generator Cost
1. Generator Size (kW)
The bigger the generator, the higher the cost. A 10 kW unit protects your essentials — refrigerator, lights, HVAC, and a few outlets. A 20+ kW unit can run your whole home seamlessly. We help you right-size based on your actual load, not the largest option available.
2. Fuel Source
Natural gas generators are the most convenient — they connect to your existing gas line and never run out of fuel. Propane is an option if you don't have natural gas, but adds the cost of a tank. We assess your fuel options during the free estimate.
3. Transfer Switch Type
A manual transfer switch is less expensive but requires you to physically switch it during an outage. An automatic transfer switch (ATS) detects a power outage and starts the generator within seconds — no action needed. We recommend automatic for most homeowners.
4. Electrical Panel Capacity
If your panel is at capacity or is an older 100A service, we may need to upgrade it before installing a generator. We assess your panel during every estimate and tell you honestly what's needed.
5. Distance from Panel to Generator Pad
The farther the generator is from your panel, the more wiring is required. Most installations have a 20–50 foot run. Longer runs increase material and labor costs.
6. Gas Line Work
If your generator is located far from your gas meter, or if you need a larger gas line to support the generator's demand, a licensed plumber may need to extend or upgrade the line. We coordinate this work.
Standby vs. Portable Generator — Which Is Right for You?
Portable Generator
Pro: Lower upfront cost ($500–$2,500 for the unit)
Con: Manual setup required. Runs on gasoline — you need fuel stored. Loud. Can't power your whole home safely. Carbon monoxide risk if used improperly.
Best for: Budget-conscious buyers, occasional use, partial coverage
Standby Generator
Pro: Automatic — starts within seconds of an outage. Runs on natural gas or propane — no refueling. Powers your whole home. Quiet and permanent.
Con: Higher upfront cost. Requires professional installation.
Best for: Homeowners who need reliable, hands-free whole-home backup power
What Brands Do We Install?
Generac
Kohler
Briggs & Stratton
We work with all three major standby generator brands. Generac is the most widely installed and has an excellent service network in NJ. Kohler is a premium option known for quiet operation and build quality. We'll recommend the right brand and size for your home and budget.
Do I Need a Permit for a Generator in NJ?
Yes. In New Jersey, standby generator installations require both an electrical permit and a mechanical/gas permit. Inspections are required by your local municipality.
We handle all permits and schedule all inspections on your behalf. You don't have to deal with the paperwork — we do it as part of every installation.
Free Generator Estimate — Monmouth & Ocean County, NJ
We install Generac, Kohler, and Briggs & Stratton standby generators throughout Central and Shore NJ. Free estimates include a full assessment of your panel, gas line, and ideal generator size — no charge, no pressure.