Residential Electrical in Cornish, Maine

Wiring in Cornish tells the town’s history in layers. Houses built before 1940, about 18 percent of the town, may still carry knob-and-tube in attics and walls, sometimes spliced into newer cable during a later renovation. The 1940s and 1950s houses, another 18 percent or so, often have cloth-covered cable and two-prong ungrounded outlets. Later homes on the hills, from the 1970s through today, generally have modern cable but may be short on circuits, GFCI protection and arc-fault protection. Converted village houses with two to four apartments add another layer: shared basements, separate panels and wiring that crosses between units. Each apartment should be fed from its own panel and meter, and any circuit that wanders from one unit into another should be traced and corrected.

Cornish’s land use ordinance allows accessory dwelling units on lawful single-family lots, attached, internal or detached, no larger than 25 percent of the main house’s floor area and no more than 600 square feet. An in-law apartment over a garage or in a carriage barn needs its own circuits, possibly its own subpanel, and a service large enough for both homes, so the electrical plan should be settled before framing. Remodels are also the right time to replace knob-and-tube and cloth wiring while walls are open, add GFCI protection in kitchens, baths and basements, add AFCI protection to bedrooms, and give home offices and workshops dedicated circuits.

Electrical permits in Cornish come from the state Electricians’ Examining Board rather than the town, while building and land use permits stay with the town code officer, so a remodel or ADU usually involves both offices. Installations begun on or after July 1, 2026 follow Maine’s adopted 2026 National Electrical Code. Goodnow Electric handles troubleshooting, outlets and switches, GFCI and AFCI upgrades, remodel and addition wiring, and complete rewiring of knob-and-tube and aluminum circuits, working carefully through plaster and trim in older houses. Any remodel in the Historic District Overlay that changes the outside of the building also goes through the town. The owner is on site for the work, and estimates are free and written.