How much would it cost to rewire a 100 year old house?

Rewiring a 100 year old house runs roughly 12,000 to 30,000 dollars in the US. A 1,500 square foot home usually lands near the middle; large homes with plaster walls go past it.

Age is the multiplier. Knob-and-tube removal, no existing grounds, plaster instead of drywall, and a panel that needs replacing all add labor hours, and labor is most of the bill.

Electricians price it per opening or per square foot, commonly 4 to 8 dollars per square foot for a full rewire including a new panel.

Get the load calculation done first. It sets the service size, the circuit count, and therefore most of the quote.

Start with the house load calculator to know what the new wiring actually has to carry before anyone quotes you.