Rewiring is the job this county's housing stock was built to need. The river cities grew fastest between 1890 and 1930 and again from 1946 into the 1970s, and each of those eras left a wiring method that has since been retired: knob-and-tube in the first, rubber and cloth-insulated cable in the middle decades, and aluminum branch circuits in a narrow window around 1965 to 1973. None of them is a reason to panic. Each is a reason to have someone who recognizes it write a plan.
Knob-and-tube in the river-bluff houses
Open ceramic knobs and tubes carrying single conductors through the joists are still live in more Moline and Rock Island attics than anyone has counted. The system was sound for its time, but it has no ground, its insulation is now brittle, and it was designed to shed heat into open air, which is why insurers and the building codes both object once blown-in insulation buries it. Homeowners typically hear about it from a buyer's inspector or from an insurance company that will not write or renew a policy while any of it remains. A rewire plan starts by mapping which circuits are still on the old system, which were already replaced by a previous owner, and where the splices between the two live — the splices are usually the real hazard.
Aluminum branch wiring in the postwar subdivisions
Houses built in the copper shortage years around 1970 in south Moline, Silvis, Milan, and Coal Valley may have aluminum wire on the fifteen- and twenty-amp circuits. Aluminum expands and contracts with load, loosens under standard screw terminals, and oxidizes, and the result is warm receptacles and the occasional charred device. The remediation is either a full replacement of the branch circuits or, where access makes that impractical, an approved connector at every device and junction that joins a copper pigtail to the aluminum. The electrician quotes both approaches and tells you which the insurer will accept.
Whole house or room by room
A whole-house rewire on an occupied 1910 foursquare is done in stages so the family keeps lights and a refrigerator throughout. Walls are fished from the attic and the basement, plaster is opened only where there is no other route and patched to a paintable surface, and each finished circuit is inspected by the city before the next begins. A room-by-room approach suits a kitchen remodel or a second-floor conversion where the rest of the house can wait. Either way, the plan lists the circuits, the opening locations, and the sequence, and the price follows the plan.
Permits, inspections, and the pre-1978 rule
Every rewire in the county is permitted and inspected by the city or the county building department where the house sits, and the electrician routed to your call is registered with that department. Because nearly every house that needs a rewire was painted before 1978, the federal Renovation, Repair and Painting rule applies to any opening of painted plaster: the work is done with lead-safe practices by a certified firm, and the quote says so. Where a rewire uncovers plumbing or gas piping that needs attention, that is state-licensed plumbing work and gets named separately.