In this guide
Identify the part, not just the word “top”
A flue cap, a masonry crown and a metal chase cover have different roles. Flashing belongs at the roof junction. An estimate that says only “repair chimney top” leaves too much open. Ask for the component name, its location and the reason it needs attention. You should be able to match the description to the inspection findings without climbing onto the roof.
Separate the observed defect from the suspected entry path
A rusted cover is an observed condition; identifying it as the only source of an indoor leak requires supporting evidence. Ask what the assessment established and what remains uncertain. A useful explanation can include limitations. If two providers disagree, compare their findings and access limits before assuming that the larger repair or lower price is the better answer.
Check compatibility and the boundaries of the work
For a factory-built system, ask how the proposed component fits the identified fireplace and chimney system. Manufacturer instructions can control details that are not apparent from appearance alone. Then clarify whether the estimate includes adjacent deterioration, roof-junction work, interior finishes or only the named component. Do not treat a replacement cover as a promise to resolve every source of moisture.
Know what happens when the repair is complete
Before approval, ask how completion will be documented and how unresolved concerns will be explained. If additional damage becomes visible during the work, agree on how a revised scope reaches you for approval. Keep the estimate and repair record together. Resolving an exterior water issue does not by itself establish that the fireplace is ready for use; ask about that decision separately.