Across 453 permits filed since 2025-05-04, the median is $12,000; half of projects fall between $4,100 and $19,500. Figures are permit valuations reported to building departments. National cost guides answer this question with averages from other markets; these numbers are what homeowners in Westchester County, NY actually reported when they pulled permits.
Recent filings
- Install gas line for generator BLDG #26-0325Village of Mamaroneck · 2026-11-03$5,000
- DISCONNECT AND REMOVE EXISTING GENERATOR. INSTALLATION OF KOHLER 20 RCA WHOLE-HOUSE, AUTOMATIC-START GENERATOR AND TRANSFER SWITCH. FOR THE INSTALLATION OF A 20 RCA GENERATOR ACCESSORY TO A SINGLE FAMILY DWELLING. GENERATOR TO BE INSTALLEDGreenburgh · 2026-10-30$8,267
- ELECTRICAL: NYEIS: DISCONNECTING EXISTING GENERATOR AND WIRING IN NEW ONE WITH AUTOMATIC TRANSFER SWITCHGreenburgh · 2026-10-30$3,500
How to read these numbers
Permit valuations are the project cost the applicant reports to the building department. They skew slightly low — nobody rounds up for the permit fee — and scope varies, so the middle-half range is the honest picture: half of all standby generator permits in Westchester County, NY came in between $4,100 and $19,500. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.
Same project, other places
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