
You want to pick a commercial mold remediation company that has experience. Specifically, you want them to have experience doing jobs like yours. Ask to see before and after photos of previous jobs. A good company will have these ready to show you. Ask them what jobs they have done before that are like your job and ask what approach they took.
Credentials
Ask the companies you are considering for their credentials. They should have professional affiliations to show you. They should also be certified to clean up mold. They should also have insurance. If they don’t have insurance, you shouldn’t work with them. They should be able to show you proof of insurance. They should also be able to show you their license. Be able to see proof of these things is important.
Quote
You should be able to get a free quote for your job. They should come to you inspect the work that needs to be done and give you a quote based on that inspection. Any company that says they can give you an accurate quote over the phone is not trustworthy. All the quotes you consider should be quotes you get in person.