Ask about the process before work starts
The contract should explain how additional work is identified, priced, authorized, and documented.
Common concealed conditions
Decking deterioration, hidden layers, flashing conditions, or other construction details may become visible after removal of old roofing.
Get changes in writing
A written change order can identify the additional work, price adjustment, and effect on the schedule.
Keep copies
Retain approved change orders with the original contract, invoices, and other project records.
How Roof Size Affects a Replacement Estimate • How Roof Pitch Affects Replacement • Roof Replacement Payment Schedule Guide