Building relationships with local businesses involves identifying businesses that may require regular dumpster services - this could include construction companies, commercial businesses, event planners, or home renovation businesses. You could reach out to these businesses directly, offering your services and possibly offering discounted rates for repeat business. Networking events and local business associations can also be a good place to meet potential business partners. Remember, these relationships should be mutually beneficial, so consider how you can offer value to these businesses, not just how they can benefit you.