Whole-Home Standby Generators on Long Island

A: Residential standby generator installation on Long Island runs $9,000–$14,000 for a Generac 20–22 kW unit — the most common size for Nassau and Suffolk homes. That covers the pad, gas line coordination with National Grid, automatic transfer switch, Town permit (Nassau or Suffolk), and commissioning. Larger 26 kW units for bigger homes add $1,500–$2,500. We do a full load calc before quoting, never a guess.

A: Either works. If you have natural gas, we coordinate with National Grid for any line upgrade. Propane installs include tank sizing.

A: Natural gas generators run indefinitely as long as gas flows. Propane depends on tank size — a 500-gallon tank typically runs a 22 kW for 7–10 days.

A: We include the first-year service free. After that it's $285/year for full oil/filter/battery check and run test.

A: Side or rear yard, at least 5 feet from any opening, 3 feet from the property line. We handle the zoning check.

A: Yes. We stage trucks in Ronkonkoma specifically for central Suffolk coverage — Smithtown, Hauppauge, St. James, Kings Park, Commack, and Lake Ronkonkoma are all same-day service areas. Smithtown Town Building Department permits for generators take 7–14 business days, and we pull those in our name on every job.

A: Yes. We install whole house generators across all of Nassau County — Garden City (11530), Hempstead (11550, 11551), Great Neck (11020, 11021), Levittown (11756), Massapequa (11758), Hicksville (11801), Syosset (11791), Manhasset (11030), Mineola (11501), Floral Park (11001), Oceanside (11572), Long Beach (11561), Valley Stream (11580), Westbury (11590), Glen Cove (11542), and every village in between. Nassau County electrical permits for generators typically process in 3–7 business days. We pull permits under our Nassau County master electrician license #E-1194A on every job.

A: The most common install on Long Island is a 20–22 kW Generac air-cooled unit, which powers a typical 2,000–3,000 sqft home including central AC, refrigerators, lights, and electronics. Homes with two AC zones, a pool pump, or EV charger usually need 24–26 kW. We do a full load calculation on every project — never a guess.

A: Generac is the market leader on Long Island — parts are stocked locally at the Deer Park distribution hub, so warranty service turnaround is typically 3–5 business days. Generac Guardian units are reliable and the Mobile Link monitoring app works well. Kohler is quieter (about 3 dB lower) and better-built, but costs 8–12% more and parts availability is slightly less immediate. We install both as a Generac PowerPro Elite and Kohler Authorized dealer. For most LI homeowners, Generac is the right call unless noise is a priority (close neighbors, small lots).

A: Yes. We serve all Nassau County towns and villages for generator installation. Garden City (11530), Great Neck (11020, 11021, 11023), Manhasset (11030), Roslyn (11576), Port Washington (11050), Oyster Bay (11771), Hicksville (11801), Levittown (11756), and every other Nassau community. We coordinate with National Grid for gas meter upgrades and pull all electrical and gas permits under our license.

A: A partial-house generator (10–14 kW, covering essentials like fridge, heat, lights, and internet) runs $6,500–$9,500 installed on Long Island. A whole-house generator (20–22 kW, covering everything including central AC) runs $9,800–$13,500. A large-home unit (24–26 kW for two AC zones, pool, EV charger) runs $12,500–$16,500. All prices include the pad, gas line, transfer switch, permits, and commissioning.