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 § 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.