Budgeting for an Electrical Service Modernization
Upgrading an outdated 60-amp or 100-amp electrical service to 200 amps is among the most common electrical improvements in Connecticut homes and light commercial properties. Because existing physical conditions, utility configurations, and municipal requirements vary significantly, published costs are for general budget planning and require a site-specific written estimate.
Typical Regional Planning Ranges (Connecticut 2026)
| Service Modernization Scope | Illustrative Planning Range | Common Included Components | Key Project Variables |
|---|---|---|---|
|
100A to 200A Overhead Service Upgrade
Single-family dwelling, standard exterior drop
|
$2,800 – $4,200 | 200A main breaker panel, SEU cable, weatherhead, meter socket, ground rods, municipal permit coordination. | Service drop height, meter relocation requirements, panel relocation distance. |
|
100A to 200A Underground Service Upgrade
Trenching, conduit, or pad-mount lateral
|
$4,200 – $6,800+ | 200A load center, Schedule 80 PVC riser, conduit burial, pull line, slip sleeve coordination. | Trench length, rocky soil, pavement cutting, utility lateral ownership boundary. |
|
400A (320A Continuous) Split Service
Large homes, dual EV chargers, heat pumps
|
$5,500 – $8,500+ | Class 320 meter enclosure, dual 200A panels or 400A disconnect, 3/0 copper or 250kcmil feeders. | Utility transformer capacity, CT metering requirements, feeder lengths. |
|
Obsolete Panel Swap (FPE / Zinsco)
Interior panel replacement; existing service cable verified safe
|
$2,200 – $3,200 | Remove hazardous panel, mount commercial-grade load center, transfer circuits, label panel. | Number of branch circuits, AFCI/GFCI breaker retrofit requirements, grounding status. |
Key Factors That Influence Your Final Project Cost
Overhead vs. Underground Service
Overhead services are generally more economical because conductors travel through air from the utility pole to the weatherhead. Underground services require trench excavation, utility-grade conduit, and coordination with Call Before You Dig (CBYD 811).
Grounding & Bonding System
Modern codes require a robust grounding electrode system: two 8-foot copper-clad grounding rods driven at least 6 feet apart, plus bonding to interior metallic water lines and gas piping within 5 feet of point-of-entry.
Meter Socket Location & Clearances
Utility rules (Eversource / UI) dictate specific working clearances and height requirements (typically 4 to 5.5 feet to center of meter). Relocating a meter around a deck, window, or gas meter adds material and labor.
Permit & Municipal Fees
Municipal building department permit fees vary by town in Connecticut, generally scaled to project valuation, and require formal trade licensing verification and inspection scheduling.
Request an On-Site Project Assessment
Because service upgrades involve utility coordination, physical measurements, and municipal code compliance, a reliable quote requires an on-site review of your existing electrical system by a licensed Master Electrician.