From HMDA: Getting It Right 2013:
Home improvement loan.
A home improvement loan is: (a) any dwelling-secured loan to be used, at least in part, for repairing, rehabilitating, remodeling, or improving a dwelling or the real property on which the dwelling is located; and (b) any loan not secured by a lien on a dwelling—that is: (i) to be used, at least in part, for one or more of those purposes, and (ii) is classified as a home improvement loan by the institution.
There used to be a "50% rule", but that went away some time ago.
So the answer is, Yes, it is HMDA reportable IF your institution codes or identifies non-dwelling secured home improvement loans in any way.
Hope this helps.