I will throw in here as well Chuck.
This board will give you a wide variety of answers. Some questions though, are very local or regional.
I would go to a trusted insurance agent, I would use an independent reccomended to me by others in similar businesses (Lawncare, plumbers, etc.) and talk to a couple of independent agents.
I have had more then my share of confusion betwixt my insurance agents and myself, and have left very dissastisfied more then once from an agents office.
If you THINK, your homeowners insurance covers it, and your Agent SAYS homeonwners covers it, then I would have him SHOW me in the policy where it says it, or write it in simple english and have him sign it (bet he wont)
For anyone to say that someone else's homeowners policy will cover it is just not good advice. Unless that person happens to be their insurance agent as there are many different coverages etc.
There will be many folks on here telling you they got XXXX policy for XXXX dollars and it covers XYZ, but really when it comes down too it, it will be you, and your insurance agent working out what is covered and the type and price etc.
I will warn you that it is easy to drive yourself out of business by buying insurance.
The next thing you will hear is about someone telling you too form a LLC. Then you will not be responsible, but it is funny, one of the classes I attended with a bunch of other folks doing contracting work (landscapers mostly) and the instructor stood up and said, how many of you are LLC's? 75% of the class raised their hands, and how many of you LLC's have used a personal credit card for a business purchase, and 90% of those raised thier hands, and how many of you have used a business Credit card to purchase something for personal use and not shown it as a payment too yourself, then a purchase, and pretty much all LLC's had been identified. Now, do you think that will show a co-mingling of financial resources between yourself and the LLC??????????
Short translation. Don't think just because you are an LLC they wont come after your personal resources.
There were a lot of really long, long faces in the crowd.
Running a business, working at others houses, with equipment often translates into running a business, even if it did not start that way, involves risks. How you manage those risks and how your luck runs will determine a lot.
I have just gotten to where I hate to look at our insurance bills lately.