Have the actual change assessed before assuming it is covered. Identify the operating entity, duties and authority involved, not just the address. Distinguish a change of geography from a change in the employment arrangement. Adding an address to an existing role may require nothing at all; moving the applicant onto another entity's payroll, or into different duties, is a separate question with its own answer.
Explain what the addition changes
A new location may or may not alter the relevant employment arrangement or responsibilities. Provide the facts and intended timing. Do not rely on a general regional title to establish that every future assignment has already been assessed.
Test each addition against three points before concluding it is covered: which legal entity employs the applicant, whether the qualifying relationship reaches that entity, and whether the duties at the new location match the capacity the petition described. A depot operated by an unrelated contractor fails the second test even where the signage is identical. Sequence matters here as much as substance.
Confirm the entity and the duties before travel is booked, since unwinding a start is harder than delaying one. Where the change is substantial, ask whether an amended petition suits the situation rather than waiting for the extension, which will be assessed against what the role actually became.