Wiring & Rewiring near you

Start with identification, because the answer changes the job entirely. CPSC states that homes built before 1965 are unlikely to have aluminum branch circuit wiring, and that electrical cables installed between 1965 and the mid 1970s in new homes, in additions and as part of rewired or new circuits may contain it. Virtually all of it went in as plastic-sheathed cable with no readily discernible distinction from copper, so the way to tell is to read the printed or embossed markings on the outer jacket where cable is visible in an unfinished basement, attic or garage, using a flashlight at a low angle to raise the embossing. Cable with aluminum conductors carries the marking Al or Aluminum along one side of the jacket every few feet. CPSC adds an important exception: a marking reading CU-clad or Copper-clad alongside it means copper-coated aluminum wire, which its repair recommendations do not cover.

The size gives a second clue. CPSC notes that aluminum and copper-clad aluminum cables are sized at No. 10 and No. 12 AWG for 20-ampere and 15-ampere rated circuits respectively, where copper would be No. 12 and No. 14. It is also explicit that the repairs it describes do not apply to the larger gauge aluminum circuits used for service entrance cables, electric clothes dryers and cooking ranges, which is a distinction a nervous homeowner reading about aluminum online rarely encounters.

On repair, CPSC recognises exactly three permanent methods, judged against criteria it publishes: the method must be safe, effective and permanent. The three are complete replacement of the aluminum branch circuit conductors with copper wire, which it calls the best method available while acknowledging that rewiring is impractical or prohibitively expensive for many homes; the COPALUM crimp method, in which a copper pigtail is joined to the aluminum with a connector installed only by a dedicated power tool and crimping die, forming what is in effect a cold weld, and installed only by electricians trained by the manufacturer; and, where COPALUM is unavailable, the AlumiConn setscrew connector as the next best alternative for a permanent repair. CPSC is equally clear about what does not qualify: pigtailing with ordinary twist-on connectors, which overheated severely in its sponsored laboratory testing, and receptacles and switches labelled CO/ALR, which it describes as at best an incomplete repair because they are not available for every part of the system and have failed in laboratory tests when connected to aluminum wire typical of that installed in existing homes. Both are treated as emergency or temporary measures only.

Concealed knob-and-tube wiring is the other vintage system that drives rewiring decisions, and the collision that usually forces the issue is insulation. The system was designed to run in open air with the conductors separated and free to shed heat, which is exactly what a blanket of blown-in insulation prevents. States handle this differently, and the jurisdiction you live in decides what is allowed.

Washington's rule shows what a careful version looks like rather than a blanket ban. Chapter 296-46B WAC permits loose or rolled thermal insulating material in spaces containing existing knob-and-tube wiring only where a set of conditions is met. The wiring must be surveyed by an appropriately licensed electrical contractor who certifies in writing to the department that it is in good condition, with no evidence of improper overcurrent protection, conductor insulation failure or deterioration, and with no improper connections or splices. The insulation itself must meet Class I specifications with a flame spread factor of 25 or less as tested using ASTM E84-81a, and foam insulation may not be used with knob-and-tube wiring at all. And every knob-and-tube circuit must have overcurrent protection in compliance with the 60 degree centigrade column of NEC Table 310.16, provided by circuit breakers or Type S fuses.

Read that as a checklist of what actually goes wrong with these circuits: oversized fuses that let old conductors run hot, brittle or missing insulation where conductors pass through framing, and decades of splices made outside boxes by people who had no intention of ever being inspected. It is also the reason insurers ask about knob-and-tube on the application rather than after a claim. Confirm the rule at your own address before anyone blows insulation into an attic that still has open conductors running through it.

Rewiring is a range rather than a single product, and the word covers jobs that differ by an order of magnitude. Getting the scope named in writing is what makes two proposals comparable.

For aluminum, this is the whole decision, and CPSC frames it honestly. It calls complete replacement with copper the best method available because it eliminates the primary cause of the hazard, while acknowledging that for many homes rewiring with copper is impractical or prohibitively expensive. Its alternative is a connection repair that reaches every connection and splice involving aluminum wire in the home, including outlets, dimmers, switches, fixtures, appliances and junction boxes, and it is explicit that appliances connected directly to the aluminum branch circuit conductors, such as dishwashers, cooling equipment, heaters, air conditioners and light fixtures, have to be included alongside the wall outlets and boxes. A partial repair is not a repair.

For knob-and-tube the calculation is different, because the conductors themselves are usually intact where they have been left alone and dangerous where they have been disturbed. A house with original circuits running undisturbed through open attic space and a house where forty years of extensions have been spliced into them are not the same project, even if both were built in 1918. This is why the survey comes first.

There is a middle path that gets overlooked in both cases. Running a small number of new, properly grounded circuits to the places that carry real load, and leaving the lighting on the old system for the time being, solves the immediate risk and the immediate inconvenience at a fraction of a whole-house rewire. It is a legitimate plan if it is written down as a plan, with what remains clearly identified, rather than sold as a finished job.

Rewiring is permitted work essentially everywhere, and the permit is worth as much as the wire afterwards. CPSC's own guidance on aluminum repairs ends on exactly this point: all modifications and additions to installed wiring should be performed and inspected in accordance with local regulations. The signed inspection record is what a buyer's inspector, an insurer and the next electrician will ask for, and its absence is what turns good work into a disclosure problem at resale.

Who may do the work is a state question with no national answer. Minnesota licenses at three levels, with a registered unlicensed electrician working under a licensed contractor or registered employer, a journeyworker electrician who must pass a written exam, and a master electrician who must hold an electrical engineering degree from an accredited college or university, a year as a journeyworker, or five years of experience in planning for, laying out, supervising and installing wiring, apparatus or equipment for electric light, heat and power. Both licensed levels renew on a two-year cycle with sixteen hours of approved continuing education, at least twelve of them relating to the National Electrical Code. Other states structure this differently, so ask which licence the person holds, in whose name the permit will be pulled, and verify the number with the board that issued it.

One credential is worth asking about specifically. CPSC states that only electricians trained by the manufacturer to use the tool properly are authorised to install COPALUM connectors, and that the training is necessary to ensure the careful, professional workmanship and thoroughness the repair requires. If a company proposes that method, ask who on the crew holds that training, not whether the company has heard of it.

The gap between two rewiring proposals is almost always a gap in scope rather than in labour rate. What moves the number is how many circuits are being replaced against how many are being re-terminated, whether attic and basement access exists or every run has to be fished blind, plaster over lath against drywall, how many floors sit between the panel and the far bedroom, whether the distribution equipment and service are changing at the same time, whether the repair method chosen requires a specially trained installer, how much wall finish will be opened and who makes it good, and what the inspector adds once the walls are open. A proposal that does not say which rooms and which method cannot be compared with one that does.

LokalMatch handles the first step and nothing beyond it. You describe the house and what you want it to do afterwards, electricians who cover your area receive that description, and the ones interested reach out to you directly. Pros pay for the requests they choose to take and the service is free for homeowners. LokalMatch does not rewire houses, does not set or negotiate prices and does not vet, rank or recommend any contractor, so checking the licence, confirming the permit will be in the contractor's name and keeping the inspection record are steps that stay with you.