Decking condition may not be fully visible until the existing covering is removed. A proposal should explain how additional work will be documented, priced, and approved. An allowance is a planning mechanism, not proof that the work will be necessary.
What to do next
Ask for the unit basis and authorization process before signing. Request photographs and location records when concealed damage is found. Compare bidders on the same assumptions so an artificially small allowance does not make one proposal appear more complete than it is.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.