I agree with Dan. Just for example, the standard secondary market security instrument (FNMA/FHLMC document) Uniform Covenant number 6 is noted below. It would to wise to see what your security instrument says, in addition to checking on your lending policy and any investor requirements.
6. Occupancy. Borrower shall occupy, establish, and use the Property as Borrower’s principal residence within 60 days after the execution of this Security Instrument and shall continue to occupy the Property as Borrower’s principal residence for at least one year after the date of occupancy, unless Lender otherwise agrees in writing, which consent shall not be unreasonably withheld, or unless extenuating circumstances exist which are beyond Borrower’s control.
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Just my opinion, I could be wrong. - Dennis Miller