House Rewiring Cost: When to Rewire and What It Costs

A full house rewire is one of the largest electrical investments a homeowner can face. It’s also one of the most important from a safety standpoint. Old wiring systems can be fire hazards, prevent home sales, and make it impossible to add modern circuits. This guide explains when rewiring is necessary and what you should budget.

When Is Rewiring Necessary?

Your home likely needs rewiring if it has aluminum branch circuit wiring from the 1960s-70s (a fire risk due to expansion/contraction issues), knob-and-tube wiring (found in pre-1940s homes, lacks ground and insulation often deteriorates), cloth-insulated wiring that’s fraying or crumbling, two-prong ungrounded outlets throughout, or frequent breaker trips and flickering lights that can’t be resolved by panel upgrades alone.

Cost to Rewire a House

Whole-house rewiring typically costs $8,000-$20,000 for a 1,500-2,500 square foot home, with an average around $12,000-$15,000. Cost per square foot ranges from $3.50-$8.00 for labor and materials. Larger homes and older homes requiring more demolition and restoration work cost more proportionally.

What Affects Rewiring Cost

• Home size — More square footage means more wire and labor
• Number of circuits — Each dedicated circuit adds cost
• Accessibility — Finished walls require more labor for fishing wire
• Panel upgrade — Often needed simultaneously, add $1,500-$3,500
• Drywall repair — Electricians typically don’t patch holes; budget $1,000-$5,000 for patch and paint

Partial vs Full Rewiring

Sometimes a partial rewire addresses the most critical safety concerns at lower cost. Replacing aluminum branch circuits in the kitchen and bathrooms, or adding grounding to circuits in specific areas, can improve safety without the full investment. However, insurance companies and buyers often want documentation of full rewiring when old wiring is present.

Insurance and Resale Implications

Some insurance companies refuse to insure homes with knob-and-tube or aluminum branch wiring, or charge significant premium increases. At resale, outdated wiring often shows up in home inspections, leading to price reductions or required repairs. Rewiring before listing can improve both insurability and sale price.

Estimate your rewiring project. Use the Wire Size Calculator on electricalcalcpro.com to verify proper conductor sizing for all new circuits during your rewiring project.