Knob-and-Tube Wiring Replacement · Portland, OR
Knob-and-Tube Wiring Replacement in Portland, OR
Knob-and-tube replacement removes early wiring (about 1880s to 1940s) that runs on ceramic knobs and tubes without a ground, and replaces it with modern grounded cable. It is commonly done before insulating, during renovations, or when an insurer requires it.
- Call now to check electrician availability in your area
- Independent, licensed electricians
- Serving Sellwood, St. Johns, Hawthorne and more
Why knob-and-tube wiring replacement comes up in Portland
Portland's Craftsman houses and Old Portland foursquares in Sellwood, Hawthorne, Alberta, Irvington and St. Johns were built from the 1900s to the 1920s, and knob-and-tube wiring is still common in their attics and walls. Portland's weatherization push makes it a frequent issue, since insulating over live knob-and-tube is not recommended, and many owners replace it before adding insulation or a heat pump. Basements and attics give the electrician routes for new cable.
Seismic retrofits are another good time. Permits come from the city's permitting office, and PGE or Pacific Power coordinates service changes.
- Portland has a large stock of early-1900s homes, many with knob-and-tube wiring.
- Heat-pump conversions and EV chargers often need service upgrades, and insulation projects require knob-and-tube to be assessed first.
- Knob-and-tube in early-1900s homes.
- Portland has a large stock of early-1900s homes with knob-and-tube wiring, and it usually comes up before an insulation project or a home sale.
- Electricians commonly recommend replacing active knob-and-tube before walls and attics are insulated, and insurers may ask about it.
- Energy-efficiency programs that pay for insulation often require knob-and-tube to be assessed first.
- Portland's older homes, including Craftsman houses and Old Portland foursquares in Sellwood, St. Johns and Hawthorne, often have knob-and-tube still in service, ungrounded outlets and basement conversions wired without permits.
- Weatherization is common in Portland, and insulation packed around active knob-and-tube is a concern worth flagging.
- Craftsman homes in Sellwood, Hawthorne and Alberta may have knob-and-tube or basement wiring added without permits, and months of rain corrode outdoor connections.
- Permits in Portland
- Electrical permits in Portland are issued by the city's permitting office; Oregon requires licensed electrical contractors.
- Electric utility
- PGE (some areas: Pacific Power)
Signs to look for
- Ceramic knobs and tubes visible in the attic or basement
- Two-prong outlets throughout the house
- An insulation contractor or energy program requiring an assessment
- An insurer asking about wiring type
- Fuses or a small service alongside old wiring
How the work is done
1. Trace active circuits
The electrician identifies which knob-and-tube runs are still live and where they go.
2. Plan the routes
New cable routes are planned through attics, basements and walls to minimize openings.
3. Install new circuits
Grounded cable, boxes and devices are installed and the old wiring is disconnected.
4. Inspect and patch
Rough-in and final inspections are completed, and access holes are patched.
What moves the price in Portland
Electricians set their own prices. Heat-pump conversions and EV chargers often need service upgrades, and insulation projects require knob-and-tube to be assessed first.
- How much knob-and-tube is still active
- Plaster versus drywall walls
- Attic and basement access
- Number of floors
- Panel upgrade at the same time
- Wall patching and painting
Knob-and-Tube Wiring Replacement in Portland: questions
Do I need a permit for knob-and-tube wiring replacement in Portland?
Usually, yes. Electrical permits in Portland are issued by the city's permitting office; Oregon requires licensed electrical contractors. The electrician normally pulls the permit and schedules the inspection.
Is the utility involved in Portland?
If the work affects the meter or service, the electrician coordinates with PGE (some areas: Pacific Power), which owns the meter and service drop.
Is knob-and-tube wiring illegal?
Existing knob-and-tube is generally not illegal, but it cannot be extended, and many insurers and lenders treat it as a reason to replace.
Can knob-and-tube be insulated over?
It is not recommended, and many codes and insulation programs prohibit it, because the wiring relies on open air to cool.
How do I know if mine is still live?
An electrician can test it. Many homes have a mix of active and abandoned knob-and-tube.
How long does replacement take?
From a few days for a small home with good access to a few weeks for larger plaster-walled homes.
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