You can buy business insurance from any of a number of different brokers. Make sure you get multiple quotes before you commit to buying a policy.

General Liability does not cover professional mistakes made by you or your employees. If you're sued over missing a project deadline or going over budget, you'll need Professional Liability Insurance (also called Errors & Omissions Insurance) to cover the claim. General Liability Insurance also doesnt cover damage to your own stuff. So if an il