This question appears first for a reason – it is often the most important factor in determining whether solar will work for you.  Unfortunately, it is one of the most difficult questions to answer due to the amount of variables.  Cost will vary depending on your energy goals, the size of your electric bill, the placement of your panels, the type of panels you purchase, if you want battery storage, and so on.
The best way to determine the cost will be to contact us to talk about your specific situation.  You will also want to see what incentives you qualify for: currently businesses in our area can get up to 80-90% of their system paid for through tax credits, grants, and other rebates!