Higher Priced Mortgage loans fall under Regulation Z. Here is the rule that identifies loans that are not considered Higher Priced Mortgage Loans:
Sec. 226.35
(3) Notwithstanding paragraph (a)(1) of this section, the term ``higher-priced mortgage loan'' does not include a transaction to finance the initial construction of a dwelling, a temporary or ``bridge'' loan with a term of twelve months or less, such as a loan to purchase a new dwelling where the consumer plans to sell a current dwelling within twelve months, a reverse-mortgage transaction subject to Sec. 226.33, or a home equity line of credit subject to Sec. 226.5b.
From what you have described, I would consider the loan a temporary or bridge loan.