Presuming that you identify the loan on your system as a home improvement loan, then the loan may be HMDA reportable. This is dependent on the source of repayment for the loan and whether you consider it temporary financing.
Based on the description you provided, I would call the loan consumer purpose. I agree that the all the early disclosures are due, except the early TIL. This is only required in the event the loan is a residential mortgage transaction. This loan is not an RMT because no first title is being acquired.
This answer is based on the assumption that, if the vacation home is rented, the borrower occupies property more than 14 days per year. If the home is rented and the borrower does not live in the home at least 14 days per year, then the procceds for the home improvement are for non-owner-occupied rental property - an exempt purpose under Reg Z.
The analysis of the proceeds is a good method to determine whether the loan is business or consumer. There is some basic discussion of this in the Commentary to section 226.3.
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The opinions expressed here are personal and do not represent opinions of my employer.