Typical ranges
Single phase upgrades usually land around $3,000 to $5,000. Three phase residential is commonly $6,000 to $12,000. Commercial scopes vary based on access and continuity requirements.
What moves the price
Distance from point of supply, board condition, asbestos risk, and whether temporary power is needed can all change scope. Any quote without those checks is guesswork.
Next step
Want this scoped for your site, not just in theory?