House rewiring replaces the branch circuit wiring throughout a home with new grounded NM cable, new device boxes and properly protected circuits, usually because the existing wiring is knob and tube, cloth insulated or damaged aluminum. Electrician Portland Oregon is a licensed, owner operated electrical contractor serving Portland, Oregon since 2011. Diagnosis means mapping what is actually in the walls: we open the panel, check attic and basement runs, pull sample devices, and use a circuit tracer to chart which areas are original wiring and which were updated during past remodels. Most Portland houses are a patchwork, and the map decides whether you need a full rewire or a targeted partial one.
Portland's inner east side and north side, largely built 1900 to 1940, hold some of the oldest housing stock on the West Coast, which is why rewiring is a core service here rather than a rarity. Knob and tube was never designed to be buried in blown-in insulation, and most of these attics have been insulated since. Cloth insulation crumbles when disturbed, so every fixture swap on those circuits gets riskier with time. The houses themselves complicate the work: plaster and lath walls that do not fish like drywall, balloon framing that lets cable drop from attic to basement in outside walls but adds fire blocking surprises, and crawlspaces where the October through May wet season leaves junction boxes damp and corroded.
A rewire is permitted through Portland Permitting and Development and inspected twice: a rough in inspection while the new cable, boxes and splices are still visible, and a final inspection after devices and fixtures are in. The Oregon Electrical Specialty Code drives the design, not just the removal: AFCI protection on the new bedroom and living space circuits, GFCI protection in kitchens, bathrooms, basements, garages and outdoors, tamper resistant outlets, spacing rules that add outlets pre war rooms never had, and hardwired interconnected smoke detectors. If the existing panel is a fuse box or an obsolete brand, the rewire is the natural moment to replace it, and if you are also adding heat pump or EV loads, we fold a service upgrade into the same permit package.
What separates a clean rewire from a wrecked house is knowing where the wire will go before the first hole is cut. We use the balloon frame cavities, closets, floor registers and stacked plumbing walls to fish cable, and we cut small, patchable openings on a plan rather than trenching walls. Two field realities catch people out. First, insurers and inspectors want abandoned knob and tube actually disconnected and its live splices removed, not just left in place, and buried energized splices in attic insulation are the single scariest thing we find. Second, ceiling fixtures on original circuits often have brittle conductors with no usable slack, so we plan junction access instead of hoping the old wire survives one more twist.
Technician insight
The scariest thing we find in Portland attics is not the knob and tube itself, it is energized splices buried in blown-in insulation from a system someone abandoned in place instead of disconnecting. Insurers and inspectors here want the old wiring verifiably dead and its live splices removed, and that difference decides whether an insulation or refinance sign off goes through.
Phased Knob and Tube Rewire in a Sellwood Foursquare
The owners of a 1912 foursquare in Sellwood were denied a renewal by their insurer over active knob and tube, and a weatherization contractor would not add attic insulation until it was signed off as dead. Our wiring survey showed the kitchen and one bathroom had been updated during a 1990s remodel, but the bedroom circuits and everything in the attic were original. We proposed a phased plan starting with the attic and bedroom circuits, fishing new grounded cable down the balloon framed outside walls and through closets to keep the plaster openings small and patchable. The old runs were disconnected, the accessible wire pulled out, and the buried splices removed rather than left under the insulation. The city passed the rough in before anything was closed up, and the final inspection gave the owners the documentation their insurer and the insulation crew both wanted. The remaining first floor circuits are scheduled as a second phase next year, permitted on their own.
House Rewiring Services We Offer
✓Knob and Tube Rewiring
Full replacement of knob and tube circuits with grounded NM cable, including verified disconnection of the old system for insurance and insulation work.
✓Cloth Wiring Replacement
Replacing cloth insulated conductors from the 1920s through 1950s before the insulation crumbles inside boxes and splices.
✓Partial Rewiring
Rewiring the worst areas first, commonly kitchens, bedrooms and attic circuits, on a plan that finishes the house in stages.
✓Aluminum Branch Wiring Remediation
Full replacement of 1960s and 1970s aluminum branch circuits, or COPALUM and AlumiConn connector repairs at every device as a code recognized alternative.
✓Kitchen and Bathroom Rewiring
New dedicated small appliance, disposal, microwave and bathroom circuits with GFCI protection, the rooms where old wiring falls furthest below modern demand.
✓Attic and Basement Circuit Replacement
Replacing the exposed runs most damaged by insulation contact, moisture and past amateur splices.
✓Grounding and Outlet Upgrades
Adding grounded three prong outlets, correcting open grounds and meeting spacing requirements room by room.
✓Remodel Wiring
Rewiring opened walls during a renovation, the cheapest time a rewire will ever be.
How it works
- 1
Wiring Survey And Map
We trace and document what wiring exists where, which circuits are original, and what past remodels changed, then propose full or phased scope with a firm price.
- 2
Permit And Plan
We file with Portland Permitting and Development, sequence the rooms to keep the house livable, and schedule around any insulation or remodel work.
- 3
Rewire And Rough In Inspection
New circuits are fished and secured, old wiring is disconnected and removed where accessible, and the city inspects before anything is closed up.
- 4
Devices, Final Inspection And Patching Handoff
We install outlets, switches, fixtures and detectors, pass final inspection, label the panel, and leave marked, patch ready openings for your drywall or plaster contractor.
Pricing
Whole house rewires in Portland commonly run $8,000 to $25,000, with partial rewires scaling down by area and remodel wiring in open walls costing far less per circuit. The price moves with square footage and story count, plaster and lath versus drywall, attic and crawlspace access, how much of the house has finished ceilings below occupied floors, whether the panel is replaced or the service upgraded in the same project, and how many buried splices and amateur repairs turn up once the old system is traced. Wall patching and painting are quoted separately or handed to your finisher. We price from the wiring survey, room by room, in writing.