solar; building permits; approval process

HB 2301 streamlines solar permit approvals for homeowners in Arizona by requiring cities to adopt online permitting systems for residential solar installations (including roof-mounted panels and home energy storage) by January 1, 2026. It mandates that cities provide "instant permitting" for complete applications within two business days, with independent reviewers allowed to handle permits if cities fail to comply. The law specifies detailed documentation requirements for solar plans (like electrical diagrams) and requires municipalities to accept automated software reviews from independent providers. This directly affects homeowners installing solar systems, contractors, and local building departments managing permit processes.