What the service should establish
Identify whether the unit is vented and obtain its model and manual. Ask for a professional with appropriate gas-appliance experience and any locally required qualifications. Chimney sweeping and gas appliance servicing are not interchangeable credentials.
Where the scope stops
The visit should define whether it covers venting, appliance servicing or both. Do not adjust gas components or substitute vent parts based on general advice. Suspected gas leaks require leaving the area and contacting emergency services or the gas utility from a safe place.
What changes the work and the quote?
Describe the appliance, fuel, number of flues and last known service before requesting an estimate. Roof height, access restrictions, concealed areas and earlier alterations can affect what can be assessed or completed. Ask the contractor to distinguish a known requirement from an allowance that may change after examination.
Request the investigation or service fee separately from optional repairs. A revised scope should identify the newly documented condition, the proposed response and the change in price before additional work is authorized. Photographs are most useful when they identify the component and location, not just a close-up without context.
Keep a record that the next professional can use
Ask for the date, appliance identification, completed work, access limitations and outstanding recommendations. Keep product information and any written warranty with the report. A completed service invoice does not by itself establish that every part of the system was examined or that every concern was resolved.
Use your Chimney Passport to organize the handover and the Quote Comparison Lab to flag exclusions before choosing a company.
Background and safety references
For inspection and maintenance background, consult CSIA homeowner resources. Product-specific work follows the applicable manufacturer instructions and local requirements. Our official resources page separates government safety advice from industry education.