Knob and Tube Replacement Cost in the PNW.

TL;DR. For pre-1950 Seattle homes with active knob-and-tube wiring, partial remediation ($5,500-$9,500) is the right answer for most insurance carriers, not full re-pull. Active K&T must be replaced; dormant K&T can usually stay in walls. Full whole-home rewire ($8,000-$22,000) only when carrier specifically requires it. Documentation packet is what determines whether insurance accepts the work.

Direct answer, K&T replacement cost in the PNW

The cost range is wide because access drives everything. A 1920s craftsman with all wiring running through accessible attic and crawl space can be rewired for $9,000 to $14,000. The same home with a finished basement, blown insulation in attic, and tight wall cavities can run $18,000 to $22,000.

Why insurance is forcing the conversation in 2026

Three things changed in the last 2 to 3 years.

The result: most pre-1950 Seattle homeowners now have a 12 to 36 month window to remediate before their next policy renewal.

Active vs dormant K&T, what insurance actually cares about

A critical distinction most contractors don’t explain:

Active K&T is energized. Currents flowing through it right now. This is what insurance carriers won’t cover.

Dormant K&T is in the walls but disconnected from the panel. The wires are there, but no current flows. Not a fire risk. Most carriers don’t object to dormant K&T being in walls; they only object to active K&T.

In a typical 1920s Seattle home, you might find:

• 30 to 40 percent of K&T in walls is dormant (already disconnected from prior partial rewires)
• 60 to 70 percent is active and needs replacement

This is why partial remediation works. If we can identify and replace only the active K&T while leaving dormant K&T safely in place, the project shrinks dramatically. Some contractors quote whole-home replacement on every job because it’s higher revenue. We diagnose first.

What a real K&T assessment looks like

Step by step.

Step 1, panel inspection. We open the panel and identify which circuits are K&T. Modern Romex circuits typically have insulated white/black wires entering the breaker; K&T circuits have older cloth-insulated wires.

Step 2, room-by-room tracing. For each K&T circuit at the panel, we trace which rooms and outlets it serves. Some K&T circuits power only 1 or 2 outlets; others power entire rooms.

Step 3, attic and crawl space inspection. We look for active K&T runs through accessible spaces. Knob-and-tube uses ceramic insulators (knobs) and tubes through joists. Easy to spot.

Step 4, outlet and junction box inspection. We open 5 to 10 representative outlets and check if they’re modern grounded outlets or two-prong outlets connected to K&T behind the wall.

Step 5, written scope. We produce a written scope describing what’s active vs dormant, what insurance requires, and the partial vs full options.

This assessment takes 60 to 90 minutes and runs $129 (credited toward any rewire work).

Cost scenarios

Three typical scopes by home age.

Scenario 1: late-1920s craftsman, partial remediation

• 1,500 to 1,800 sq ft
• Active K&T in 2 to 3 rooms only
• Dormant K&T elsewhere (no objection from most insurers)
• Scope: rewire affected rooms, modern grounded outlets and AFCI breakers
• Typical range: $7,000 to $9,500 including drywall patch and texture
• Most insurers accept this scope with documentation packet

Scenario 2: late-1920s craftsman, whole-home + bundled HVAC

• 1,500 to 1,800 sq ft
• Active K&T throughout (no prior remediation)
• Scope: full whole-home rewire + 100A → 200A panel upgrade + heat pump install bundled
• Typical range: $30,000 to $36,000 over 3 to 4 weeks
• Bundled approach (vs sequential projects) saves $3,000 to $5,000

Scenario 3: pre-1920 victorian, full rewire

• 2,500 to 3,000 sq ft
• Active K&T throughout, plus K&T in unfinished attic
• Finished basement requires extensive small wall cuts and drywall patches
• Scope: full whole-home rewire, panel upgrade, plus AFCI/GFCI throughout
• Typical range: $24,000 to $30,000 over 4 to 5 weeks plus drywall patch/texture/paint

What insurance carriers actually want to see

When you call your insurance carrier with the work complete, they typically want:

• Pre-work photos showing K&T present (we take these during assessment)
• Post-work photos showing modern Romex and grounded/AFCI/GFCI devices
• City permit number (always pulled, never skipped)
• Inspection sign-off date with city stamp
• Master electrician license number (Washington requires master for service-entrance work)
• Detailed scope description describing full home vs partial vs CO/ALR-only remediation

We produce all of this in a single packet at completion. Most carriers process the policy renewal within 30 days of receiving documentation.

About 30 percent of K&T documentation submitted by other contractors gets rejected for incomplete photos or unclear scope. Our packets have never been rejected.

How long it takes

We work in occupied homes. Power is intermittent in the affected rooms. Most homeowners stay in the home; some prefer a hotel for the final connection days.

Schedule a K&T assessment

Call (206) 200-9134. $129 diagnostic assessment with written scope, partial vs full options, and insurance documentation outline.