This is NOT a construction loan. The home is already built. However, it does sound like 2 phase financing. You don't report the first phase in these situations as it is temporary financing.
When you make the permanent loan, it would not be a refinancing. It would be reported as a HI loan since you didn't report the first phase.
BTW, this is not a "commercial loan" just because it is done by a LO in your commercial loan department. It sounds like a consumer purpose loan.
You may find our article "HMDA Temporary Financing" helpful. You can find it at our website:
http://www.bankerscompliance.com/compliance-resources/free-downloads.htm