Is this a RLOC or guidance LOC?
RLOC - not reportable IMO. The new loan neither satisfied an existing dwelling secured obligation nor did it convert a construction loan to a permanent loan.
Guidance LOC - if the LOC is evidenced by a "master note" then again I would opine not reportable for the same reasons mentioned above. If however each loan is evidenced by an individual note then I would opine the note executed for the construction phase would be a construction loan being converted to a permanent loan and therefore a home purchase for HMDA reporting.
The above opinions are based on the assumption the term loan was made to the builder.
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The opinions expressed are mine and they are not to be taken as legal advice.