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Home Rewiring · Pennsylvania
Rewiring replaces old branch-circuit wiring, such as knob-and-tube, ungrounded cloth-insulated cable or 1960s–70s aluminum branch wiring, with modern grounded copper cable. It can be done room by room, and an electrician will tell you which circuits matter most.
Philadelphia and Pittsburgh rowhomes and older suburbs carry original wiring and small services.
Across the Mid-Atlantic, homes deal with humid summers, coastal storms and occasional ice. Permit offices, utilities and housing stock differ by city, which affects how home rewiring is planned and scheduled. These local guides cover the Pennsylvania cities where we have written specific notes.
Philadelphia rowhomes built before 1940 often still have knob-and-tube wiring, and kitchen or bathroom renovations usually expose it. Rewiring a rowhome is complicated by shared party walls and plaster, so electricians fish new cable through walls and floors where they can and open plaster only where they must.
Utility: PECO
Pittsburgh's pre-1940 rowhouses and hillside homes commonly have knob-and-tube wiring, sometimes still in use behind newer circuits. Rewiring is typically done during renovations, before insulating, or when an insurer asks.
Utility: Duquesne Light
Allentown's brick and stone rowhouses in Center City and Old Allentown date largely from the late 1800s and early 1900s, and many still have knob-and-tube or cloth-insulated wiring behind plaster, sometimes alongside circuits added when houses were split into apartments. Shared walls and narrow layouts limit routes, so electricians work through basements, floors and attics.
Utility: PPL Electric Utilities
Scranton's Hill Section and Green Ridge hold large Victorian and early-1900s homes built during the coal boom, and many still have knob-and-tube or cloth wiring, often in houses split into apartments with separate meters. Rewiring usually comes up during renovation, before insulating, or when an insurer asks.
Utility: PPL Electric Utilities
Harrisburg's rowhouses in Midtown, Old Uptown and Allison Hill date from the 1870s to the 1920s, and knob-and-tube or cloth wiring still runs behind plaster in many of them, often in houses divided into apartments. Shared brick walls limit routes, so electricians work through floors, basements and attics.
Utility: PPL Electric Utilities
Lancaster's brick rowhouses in Cabbage Hill, the West End and Chestnut Hill date from the 1800s and early 1900s, and knob-and-tube or cloth wiring still runs behind plaster in many of them, often extended when houses were split into apartments. Shared brick party walls limit routes, so electricians work through floors, basements and attics, usually one floor at a time.
Utility: PPL Electric Utilities
Reading's rowhouses in Centre Park, Callowhill and the neighborhoods around Penn's Common were built during the city's railroad and textile boom, and knob-and-tube or cloth wiring still runs behind plaster in many of them. Centre Park's large Victorians, many converted to apartments, often have old and new wiring mixed throughout.
Utility: Met-Ed (FirstEnergy)
Wilkes-Barre's doubles and single homes in the Heights, South Wilkes-Barre and Parsons were built for coal miners, merchants and railroad workers from the 1880s to the 1920s, and knob-and-tube or cloth wiring still runs through many of them. A double usually means two rewiring jobs, one for each side, with separate panels and services.
Utility: PPL Electric Utilities
1. Assessment
Wiring type, condition and circuit layout are documented.
2. Plan and permit
Circuits are prioritized and the work is permitted.
3. Rewire
New cable is fished through walls and ceilings with minimal openings.
4. Inspection and patching
Rough-in and final inspections, then wall openings are closed.
Electricians set their own prices; local permit fees and utility requirements add to these factors.
Permits come from the city or county where the home is. For example: Philadelphia: Electrical permits in Philadelphia are issued by the Department of Licenses and Inspections (L&I) to licensed electrical contractors. Pittsburgh: Electrical permits in Pittsburgh come from the city's Department of Permits, Licenses and Inspections (PLI); surrounding boroughs and townships handle their own. Allentown: Electrical permits inside the city come from the City of Allentown's building standards and safety office; surrounding townships issue their own. Scranton: Electrical permits come from the City of Scranton's licensing, inspections and permits office. Harrisburg: Electrical permits inside the city come from the City of Harrisburg's codes bureau; surrounding townships issue their own. Lancaster: Electrical permits inside the city come from the City of Lancaster's permits office; surrounding townships issue their own. Reading: Electrical permits inside the city come from the City of Reading's permits office; surrounding boroughs and townships issue their own. Wilkes Barre: Electrical permits inside the city come from Wilkes-Barre's code enforcement office; surrounding boroughs issue their own.
Philadelphia: PECO. Pittsburgh: Duquesne Light. Allentown: PPL Electric Utilities. Scranton: PPL Electric Utilities. Harrisburg: PPL Electric Utilities. Lancaster: PPL Electric Utilities. Reading: Met-Ed (FirstEnergy). Wilkes Barre: PPL Electric Utilities.
No. Many homeowners rewire in phases, starting with kitchens, baths and bedrooms.
Aluminum branch wiring can overheat at connections. Approved repairs (such as rated connectors) or replacement reduce the risk; an electrician can advise which fits.
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