Questions to Ask a Chimney Sweep Before You Book

Before you book: the phone call

A few minutes on the phone tells you a lot. You are trying to learn whether the company knows chimneys like yours, whether the price is clear, and whether the person who shows up will take the time to explain what they see. Have a few facts ready so the answers are specific: what the chimney serves (fireplace, wood stove, oil or gas boiler, water heater), roughly how old the house is, when the chimney was last swept, and anything you have noticed, such as smells, smoke in the room or water.

Then ask the questions below and listen to how they are answered as much as to the answers themselves.

• Is the company licensed for this kind of work where I live, and insured?
• Will your employees do the work, or do you send subcontractors?
• What exactly does the visit include: sweeping, an inspection, both?
• Do I get the price in writing before any work starts?
• Do you work on my type of appliance, such as an oil boiler or a gas insert?
• Does the visit cover every flue in the chimney, or only the fireplace?

What a complete visit should include

Sweeping means removing soot and creosote from the flue, smoke chamber and firebox, but a visit worth paying for also looks at the system. That includes the firebox and its mortar joints, the damper and whether it seals, the smoke chamber above it, the flue liner as far as it can be seen, the cap and crown on top, and the connection where a stove or boiler pipe enters the chimney. NFPA 211 calls for chimneys, fireplaces and vents to be inspected each year, and an annual sweep is the natural time for that look.

Ask whether they go on the roof or work only from below. Many problems, such as a cracked crown, a rusted cap or failed flashing, can only be judged from the top.

About the visit itself

Ask how they keep dust in the chimney and out of the house. Expect to hear about drop cloths from the door to the hearth, a sealed opening or a vacuum running at the fireplace while the brushes work, and debris carried out rather than left in the ash pit. Ask how long a chimney like yours usually takes and whether someone needs to be home, and whether the fireplace, stove or boiler must be cold beforehand.

If the chimney serves both a fireplace and a heating appliance, ask whether both flues are covered and whether the boiler needs to be shut down. Oil flues collect soot and acidic scale at the base, so emptying the cleanout and cleaning the smoke pipe are part of the job.

About repairs

This is where the answers matter most. Ask what happens if they find something wrong. The answer you want is that they will show you the problem, explain it in plain language and give you a written estimate you can think about. Ask whether they do the repairs with their own people and whether you are free to get another opinion.

A sweep who finds an urgent problem, such as a cracked liner on a flue that vents a boiler or a blocked flue, should still be able to show you where it is and why it matters, and leave the decision with you. Saying a chimney should not be used until it is repaired is reasonable; insisting the repair be signed today is not.

It also helps to ask how repairs are scheduled and priced. Some work, like a cap or a damper, is often done on a short return visit; larger work such as a liner, a crown rebuild or flashing needs planning, materials and sometimes a permit. A clear answer about what happens next, and when, is a good sign the company does this regularly.

Licensing, insurance and credentials

Licensing rules for chimney and masonry work differ by state, county and city across New York, New Jersey, Pennsylvania and Delaware. In some places a home improvement contractor registration applies; in others a local license does. Rather than relying on what a company says, ask for the license or registration number and check it with your local licensing office, and ask for proof of insurance naming the business.

Trade group memberships and course badges are worth asking about, but they do not replace a license where one is required, and the rules in your area are something to confirm locally.

Good answers and warning signs

Most of the difference between a careful company and a careless one shows up in how they answer the same handful of questions.

• What does the price cover? Look for a clear list of what is included, not a low teaser price with add-ons on site
• Will I get it in writing? The right answer is yes, before any work starts, not a promise to see once they arrive
• Who does the work? Expect the company's own employees, named before the visit, not vagueness about who shows up
• What if you find damage? You want to hear that they will show you and write an estimate, not pressure to approve on the spot
• Can I see the problem? A careful sweep shows it from the opening or the roof rather than only describing it

Red flags to take seriously

Be careful with a price that sounds far below everyone else, a refusal to put anything in writing, or a sweep who will not let you see the damage they describe. Pressure to sign on the spot, requests for full payment up front, and offers that come from a knock on the door after a storm deserve a second opinion. So does a diagnosis that the whole chimney must be rebuilt when the only symptom you called about was a smoky first fire.

None of this means a large repair is never real. It means a real one can be shown, explained and written down, and will still be there next week when you have had time to compare.

After the visit

Ask for a written record of what was done and what was found, flue by flue. Keep it with your house papers; it helps the next technician, an insurer after a claim, and a buyer's inspector if you sell. If repairs were recommended, note which ones were called urgent and why, and set a reminder for the next annual sweep and inspection.