Across 171 permits filed since 2025-04-29, the median is $4,500; half of projects fall between $3,500 and $6,500. 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 Norwalk, CT actually reported when they pulled permits.
Recent filings
- INSTALL (26KW) STANDBY GENERATOR-UPGRADE SERVICE FROM 200 TO 400 (1) NEW 200 AMP PANELCity of Norwalk · 2026-10-28$18,000
- INSTALLING 1 TESLA POWERWALL 3 BATTERY WITH TESLA POWERWALL CONTROL PANEL.REPLACING 200 AMP BREAKER WITH 125 AMP BREAKERCity of Norwalk · 2026-10-26$5,100
- SERVICE UPGRADE TO 200 AMPCity of Norwalk · 2026-10-23$2,500
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 electrical panel upgrade permits in Norwalk, CT came in between $3,500 and $6,500. 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
Electrical panel upgrade in New JerseyElectrical panel upgrade in New YorkElectrical panel upgrade in Connecticut