- Inquire whether the services are charged per hour, per square foot, or on some other basis, and ask for an estimate specific to your project. 3. **What is your experience and what kind of equipment do you use?

- Inquire whether the services are charged per hour, per square foot, or on some other basis, and ask for an estimate specific to your project. 3. **What is your experience and what kind of equipment do you use?