The answer to 'how much is junction box upgrade' is that the cost can vary significantly depending on several factors. In general, upgrading a junction box typically ranges from $150 to $500 or more. The exact price will depend on the size and complexity of the job, the materials needed, the location of the junction box, and whether any additional electrical work is required.
Some key factors that influence the cost of a junction box upgrade include the type of junction box (metal vs. plastic), the number of circuits it needs to support, whether it needs to be relocated, and if any rewiring or upgrades to the electrical panel are necessary. Larger or more complex jobs, or those requiring permits and inspections, will be on the higher end of the price range.