Knob and Tube Wiring Replacement Cost in Los Angeles:
Complete Pricing Guide [2026]
What it costs to replace knob and tube wiring in Los Angeles in 2026: published whole-home and per-circuit pricing, the LADBS permit path, insurance implications, and how the job actually runs.
Published: October 2026 · Updated: October 2026
What Knob and Tube Wiring Is and Why LA Homes Still Have It
Knob and tube (K&T) wiring was the standard residential electrical method from the 1880s through the 1940s. It consists of single-insulated copper conductors run through porcelain knobs (for support) and tubes (for protection where wires pass through framing). There is no ground wire, and the system was designed for a fraction of today's electrical load.
Los Angeles has thousands of homes — especially in neighborhoods like Highland Park, Echo Park, Angelino Heights, and West Adams — with active K&T wiring. The wiring itself is not automatically dangerous when intact, but it is obsolete: it cannot safely support modern loads (HVAC, EV chargers, large appliances), lacks grounding, and is often compromised by insulation contact, splices, or age.
Many California insurers refuse to write or renew homeowner policies on homes with active K&T, and code requires replacement when walls are opened during renovation. If your home was built before 1950 and has never been rewired, K&T is likely present.
Knob and Tube Wiring Replacement Cost in Los Angeles
Because K&T replacement is a whole-home or partial rewiring, we quote it from the same published cost table as our whole home rewiring cost guide. These are the prices AMY Electric publishes for Los Angeles projects in 2026:
| Scope / Item | Typical Range | Notes |
|---|---|---|
| Whole-Home Rewire (1,500–2,500 sq ft) | $8,000 – $15,000+ | Full replacement of K&T with modern NM cable, new panel if needed |
| Per-Circuit Replacement | $1,500 – $3,500 | Single circuit or room; ideal when full rewire is not yet required |
| Partial Rewire (kitchen/bath) | $3,000 – $6,000 | Targeted upgrade for remodeled rooms |
| Panel Upgrade (if needed) | $2,500 – $4,500 | Often required when K&T service is 60A |
| LADBS Permit & Inspection Fees | $200 – $450 | Included in AMY Electric all-inclusive quotes |
| Federal 25C Tax Credit (Inflation Reduction Act) | Up to -$600 | 30% tax credit for qualifying panel upgrades |
Ranges reflect Los Angeles labor rates, home size, and accessibility. A site visit confirms the exact scope. Estimates are free and provided in writing.
What Moves Your Knob and Tube Replacement Price
Home Size and Layout
Larger homes and multi-story layouts require more wire, more labor, and more time.
Wall and Ceiling Access
Plaster walls, stucco, and finished ceilings add labor for fishing wire. Open attic access speeds the job.
Panel Capacity
Older homes with 60A service often need a panel upgrade alongside the rewire, adding $2,500–$4,500.
Circuit Count
More circuits, dedicated appliance circuits, and EV charger circuits increase scope and cost.
Renovation Scope
If walls are already open during a remodel, rewiring is faster and cheaper. Closed-wall work requires fishing.
Code Upgrades
GFCI, AFCI, and grounding upgrades required by current code add material and labor.
Permit and Code Considerations for K&T Replacement in LA
- Permit required. A whole-home or partial rewiring requires an LADBS electrical permit and a city inspection against the California Electrical Code.
- Permit fees included. LADBS permit and inspection fees ($200–$450) are included in our all-in quotes.
- Code compliance. The new wiring must meet current CEC requirements: grounding, GFCI/AFCI protection, and proper box fill.
- Insurance documentation. The permit and inspection record supports insurance reinstatement and resale.
Los Angeles uses LADBS (Department of Building and Safety) for electrical permitting, with online filing through PermitLA and ePlanLA. Never hire a contractor who suggests skipping the permit on a rewire.
Insurance, Renovation, and Selling a Home with K&T Wiring
- Insurance. Many California carriers refuse to write or renew policies on homes with active K&T, or charge higher premiums. Replacing the wiring can restore standard coverage.
- Renovation trigger. Code requires replacement when walls are opened during a remodel, so bundling the rewire with a kitchen or bath remodel saves money.
- Escrow. Inspectors flag K&T on reports; buyers often demand replacement or a credit. Replacing before listing removes the objection.
- Documentation. AMY Electric provides the permit record and passed inspection report for insurance and resale.
Our Knob and Tube Replacement Process
- Site visit and quote. We assess the full system, check panel capacity, and provide a written estimate with whole-home or per-circuit pricing.
- Permit filing. We file the LADBS permit before work begins.
- Wiring replacement. We replace K&T with modern NM cable, routing through attic, crawlspace, and walls.
- Panel coordination. If the service panel needs upgrading, we coordinate it in the same project.
- Inspection. LADBS inspects the work; we attend and provide the passed inspection record.
- Cleanup. We remove debris and leave the space ready to finish.
Frequently Asked Questions
How much does knob and tube wiring replacement cost in Los Angeles?
Is knob and tube wiring dangerous?
Do I need a permit to replace knob and tube wiring?
Will my insurance cover knob and tube wiring?
How long does knob and tube replacement take?
Can I keep some knob and tube and replace the rest?
AMY Electric provides free written estimates for rewiring across Greater Los Angeles. C-10 #981578 · EVITP #4051604.