Don't just go to buy devices at a big box store and start using them for your customers. Make sure you have your ducks in a row before you offer any of these services.

You should not offer any of these services until you have had proper training and understand the testing protocols. As Corey pointed out, some states require licensing (e.g., for radon testing) and some testing devices may not meet certain standards (e.g., EPA and NEHA approval for radon testing devices).

Even if you use the same devices any homeowner can buy at a big box store you can justify your fee due to training, professional membership and third-party impartiality. You will know the testing protocols much better than a homeowner and how to interpret the results. To truly differentiate yourself from the pack offer testing with devices not available to homeowners and inspectors who use those big box devices.

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"Baseball is like church. Many attend but few understand." Leo Durocher
Bruce Breedlove
www.avaloninspection.com