After you accept the offer, notify FEMA before changes involving buildings 45 years or older, ground disturbance, or work in or near water. Routine changes like material substitutions or new floor plans don’t need notice. At closeout, the recipient certifies the work and costs within 180 days, with a final report; you don’t track costs line by line.
The recipient’s closeout certification with a final cost report covering: actual work completed, mitigation achieved, EHP compliance, civil rights compliance, obtain and maintain insurance compliance, total actual costs, procurement compliance, and actual insurance proceeds.
The recipient’s 180-day certification is what lets you keep excess funds, so make sure your final cost report and compliance records are ready well before then.