First off, FAQ p21 states:
1) Q: If a transaction involves new construction in which the loan may not close for months, how does this affect the issuance of a GFE?
A: In transactions involving new home purchases, where settlement is anticipated to occur more than 60 calendar days from the time a GFE is provided, the loan originator may provide the GFE to the borrower with a clear and conspicuous disclosure stating that at any time up until 60 calendar days prior to closing, the loan originator may issue a revised GFE. If no such separate disclosure is provided, the loan originator may not issue a revised GFE in the absence of changed circumstances or another event as provided in 24 CFR ยง 3500.7(f).
If you haven't locked the rate yet, you must redisclose and can capture any costs that change as a result of the rate lock.
Otherwise, if no costs are changing, I'm at a loss as to why you'd want to redisclose.