Cecile the lending staff at my institution struggle with what you are talking about every day. The distinction I make when I explain it, is that we have a managed construction product that can be sold when a customer is:
Purchasing property and building a house on it,
Refinancing property to build a house on it
Constructing a new house on owned land, or
A home equity loan for improvement to an existing home
We can have any of the TRID purposes, but our product is still the same managed construction product with the same I/O period, term length, UW process, etc.
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Not legal advice. Not the opinion of my employer.