The answer to 'generator installation cost in Illinois' is that the cost can vary widely depending on several factors. In general, the typical range for a whole-home generator installation in Illinois is between $3,000 to $15,000, with most homeowners spending around $7,000 to $10,000.
The main factors that influence the cost include the size and type of generator, the complexity of the installation, the accessibility of the installation site, and any necessary electrical upgrades or permits. Larger generators with more power output will cost more, as will installations that require significant electrical work or are in hard-to-reach areas. Getting multiple local quotes is essential to determine the specific cost for your home and situation.