Most contractors should have a list of references available upon request, which includes contact information from past clients who have used their services before. This list should include names, phone numbers, email addresses, as well as any other relevant details about each client’s experience with the company.
If possible, try to reach out directly to these people so that you can ask them more detailed questions about their experiences working with this particular demolition service provider. Additionally, many contractors also post reviews online through sites like Yelp or Google Reviews; reading through these reviews can give you an even better understanding of what kind of service they offer and whether or not they would be suitable for your needs.