Knob-and-Tube Replacement in Portland, OR & the Metro Area
- Written report for your insurer
- Full or circuit-by-circuit
- Everything tested before we leave
What Our Customers Say
Is There Knob-and-Tube Wiring in Your Portland Home?
Signs to look for in a house built before 1940
Why Knob-and-Tube Replacement Comes Up in Portland
Knob-and-tube replacement for Portland houses built before 1940: original wiring swapped for grounded cable, with a written report for your insurer, across Portland, Oregon City, Vancouver, and surrounding communities.
Knob-and-tube is the wiring system used in most houses built before 1930 and in some into the 1930s. Single conductors pass through ceramic tubes and rest on ceramic knobs, with cloth or rubber insulation and no ground wire. It was adequate for the loads of its day. The problems are age and the way we live now: the insulation dries out and cracks, splices sit in open air rather than inside boxes, and there is no ground for modern appliances or three-prong outlets.
The other problem is insulation of a different kind. Knob-and-tube was designed to shed heat into open air, so it is not rated to be buried in blown-in or batt insulation. Many Portland attics were insulated decades after the wiring went in, which is exactly the condition it was never meant for. With 38.9% of the city's dwellings built before 1940, this is a common find in an attic or basement. A house that looks updated at the panel can still carry its original wiring upstairs, spliced into newer cable somewhere in the basement. When it still feeds most of the rooms, the job is closer to a rewire, and what moves the price and timeline of a whole-house rewire applies.
Many insurers ask about knob-and-tube when a policy is written or renewed, and some want it replaced before they will cover the house; what Portland insurers actually require varies from one company to the next. We can inspect and give you a written report of what is active, what is dead and what has already been replaced. Knob-and-tube replacement means running new grounded cable to the same rooms, adding boxes where splices used to hang in the open, and disconnecting the old wiring. We pull the permit, and the city checks the work before walls close and again at the end. Old wiring left in place is disconnected at both ends so nothing dead can be re-energized later.
Full Knob-and-Tube Replacement vs Circuit-by-Circuit
Full Replacement
Circuit-by-Circuit Replacement
How Knob-and-Tube Replacement Works in Portland
Trace the wiring
Find what is live, dead or already replaced
Written estimate
Full or staged scope, agreed before work
Plan the routes
Attic, crawlspace and wall paths mapped
Rough-in
New cable run and checked before walls close
Final
Old wiring disconnected, every circuit tested
What Affects the Cost of Replacing Knob-and-Tube in Portland
No two old houses hide the same amount of original wiring, and these are the things that decide how big the job is.
How much is still live
A house with a few active old circuits left is a smaller job than one still running mostly on them.
All at once or in stages
Replacing every old circuit and replacing only the rooms you use most are very different scopes.
Attic and crawlspace access
Open attics and crawlspaces let new cable reach rooms without opening walls; tight or insulated ones take longer.
Plaster walls
Where cable cannot be fished from above or below, plaster has to be opened, which adds time.
Rooms and devices
Every outlet, switch and light fed by the old wiring needs new grounded cable and a proper box.
The panel
A full or outdated panel may need replacing so the new circuits have somewhere to land.
Two inspections
The city checks the work before walls close and again at the end.
Every job gets a written estimate before any work starts.
Why Portland Homeowners Call PWR Pro Electric
Written estimate before any work begins
Full or staged, you choose the scope
Financing available
Ask about it when you get your written estimate
Licensed Oregon contractor, CCB #259813
Verify it with the Oregon CCB
Written report for your insurer
What is active, what is dead, what was replaced
Related Wiring & Rewiring Services
Knob-and-Tube Replacement Questions
Can knob-and-tube be repaired instead of replaced?
Can knob-and-tube handle modern appliances?
Do I need a panel upgrade, a rewire, or both?
How long does knob-and-tube replacement take?
Where We Work
Book Knob-and-Tube Replacement in Portland
Written estimate before any work begins.