Ancillary Services???

I keep seeing “Ancillary Services” mentioned. Can someone tell me exactly what it means?
Are they like “Extra Services that are more specialized and go above and beyond a basic visual inspection”?

Yes.

I offer WDI (wood destroying insect) inspections and Radon tests which are ancillary services.

Yes, services that are beyond the basic home inspection.
What services you may or may not offer largely depends on local conditions.

Being in Los Angeles, I offer pool inspections, as many homes here have them.

Indoor Air Quality and water testing are some others.

Thank you everyone! I appreciate your help!

Yup, I offer radon and mold.

There are other inspections as well for the client to consider.
Chimney, water, well, sewer line video inspection, termite, etc…