Knob-and-Tube Wiring Replacement Cost in Phoenix, AZ (2026)

Knob-and-Tube Wiring Replacement in Phoenix, AZ costs $4,891–$13,560 in 2026, with most homeowners paying around $9,226. That’s about 4% below the national average (BLS cost index: 0.96). Licensed electricians in the Phoenix-Mesa-Chandler metro charge $60–$105/hour. Typically takes 3-5 hours per circuit Phoenix typically requires permits for this work, running $100–$400.

Updated April 2026Based on public BLS & industry data

Estimated Cost

$4,891–$13,560

Mid-range estimate for 8 circuit in Phoenix, AZ. Labor: $60–$105/hr.

14/2 & 12/2 NM-B wire: $80–$160/roll
New outlets & switches: $3–$10/each
Junction boxes: $2–$8/each
Staples, connectors & plates: $20–$60/lot
AFCI breakers: $30–$65/each
Drywall patching supplies: $20–$75/lot

Calculate Your Cost

Number of circuits

1–30 circuit

Material Grade

Additional Factors

Plaster & lath (difficult fishing)(+$100–$300)

Insulation around K&T (must remove)(+$200–$600)

Multi-floor home(+$150–$400)

Factors That Affect Cost

1Number of K&T circuits to replace
2Home age, size, and wall construction
3Accessibility (attic, crawlspace, or neither)
4Insulation removal around existing K&T
5Drywall repair needs (separate trade)
6Panel upgrade if needed

Permit Note

Maricopa County permits are required for most construction work. Residential permits run $50–$200. The city offers expedited review for an additional fee.

Why replace knob-and-tube

K&T wiring was standard before 1940 but lacks grounding, can't handle modern loads, and becomes a fire risk when covered with insulation. Most insurance companies require removal.

The replacement process

The electrician traces each K&T circuit, runs new NM-B cable through the same paths where possible, installs grounded outlets, and connects to new breakers. The old K&T is de-energized and left in place or removed.

How We Calculate These Numbers

Our cost estimates are built from publicly available data including the Bureau of Labor Statistics (BLS) Occupational Employment & Wage Statistics, HomeGuide, Thumbtack, and Fixr cost databases. Material prices reflect national averages from major retailers, cross-referenced across 3+ sources for accuracy.

For Phoenix, we apply a regional cost-of-living multiplier of 0.96 (4% below the national average) based on BLS regional data. Labor rates reflect the local Phoenix metro market as of 2026.

QuotrPro Pricing Research Team

AI-powered estimating platform used by contractors across the US. Data reviewed quarterly against BLS and industry benchmarks.

These are estimates for planning purposes. Actual costs vary by project scope, contractor, and market conditions. Always get 2–3 quotes from licensed professionals.

Frequently Asked Questions

Is knob-and-tube wiring dangerous?

K&T wiring isn't inherently dangerous when in good condition, but it has no ground wire, can't be insulated over, and often has degraded insulation after 80+ years.

Will my insurance drop me for K&T?

Many insurers refuse to write policies or charge steep premiums for homes with active K&T. Replacing it can significantly lower your insurance costs.

Do I need to replace all of it at once?

Not necessarily. You can replace circuit by circuit, prioritizing active K&T in insulated areas. However, full replacement is recommended for resale.

How much drywall damage will there be?

Experienced electricians minimize wall openings by fishing wire through existing paths. Budget for some patching and painting, especially at old junction points.