What you are paying for in a chimney inspection

The yearly check NFPA 211 describes

Under NFPA 211, the yearly inspection comes down to three questions: is the chimney sound, is it free of deposits, and does it keep its required clearances to anything that can burn? Cleaning, maintenance and repair follow when the answers call for them.

Those three checks are what a chimney inspection price pays someone to do. A fireplace inspection cost covers the same ground, since the same standard covers fireplaces alongside chimneys and vents. Everything else on this page is about how long they take on your particular house.

What gets checked, from cap to hearth

On a wood-burning masonry fireplace, the visit follows two paths at once: the path smoke takes up and out, and the path water takes down and in.

• Cap and spark arrestor: present, fastened, with the mesh intact.
• Crown: cracks, slope, and the sealed joint at the flue tile.
• Flue liner: cracked, shifted or missing tiles, open joints and deposits.
• Masonry above the roof: loose brick, open joints and spalled faces.
• Flashing: gaps, lifted steps, and sealant standing in for metal.
• Smoke chamber and damper: the parging, rust, and whether the damper closes.
• Firebox and hearth: cracked firebrick, open joints and the hearth extension in front.
• Clearances: framing and trim near the chimney, wherever the attic or the room gives a view of it.

What widens the scope

The checklist stays the same from house to house. The time it takes does not, so the honest reply to 'how much is a chimney inspection?' depends on the things that stretch it.

• More flues. Each flue is checked along its own length, from its own opening.
• More appliances. A chimney that serves a fireplace and a second appliance is checked at each connection.
• Prefab units. The check follows the installation manual for the listed chimney, the firestops and the chase top, which starts with finding the unit's model information.
• Roof access. A tall stack, a steep pitch, or a tile or metal roof takes more setup to reach safely.
• Attic and crawlspace access. Clearance checks need a way to see the chimney where it passes through framing.
• A leak history. A reported leak means tracing the water path, on the roof and in the attic.

Clearance checks, and why they can take the longest

Clearance is the part of the yearly check that homeowners see least. For a masonry chimney, FBC Residential R1003.18 calls for an airspace of at least 2 inches between the chimney and combustible framing for any part of the chimney inside the building or built into an exterior wall. A chimney standing wholly outside the exterior walls needs at least 1 inch. That gap hides behind drywall, trim and insulation.

Checking it means finding the places where the chimney can actually be seen: the attic where it passes the ceiling framing, a closet behind the fireplace wall, a crawlspace below. A house with those spaces open and reachable takes less time than one where the hatch is painted shut or the attic is packed with stored boxes.

A prefab unit's clearances are printed in its installation manual and on its label. Those come from the listing, not from the masonry rule, so the model number decides what the check measures.

Findings and the work they point to

An inspection ends in findings, and each finding points to a specific kind of work. Seeing the pairs ahead of time makes the written estimate easier to read.

• Heavy deposits in the flue point to a sweep, or to creosote removal if the deposit has glazed.
• A cracked crown points to a sealer or a recast, depending on how deep the cracks run.
• A gap at the flashing points to a reset or a full reflash.
• Cracked flue tile points to a choice between tile repair, a listed resurfacing system and a new liner.
• A rusted or warped damper points to freeing, re-hanging or replacing it.
• Missing clearance points to a stop-use note and a plan to correct it.

Inspecting on a home-sale clock

A purchase adds two things to an inspection: a deadline, and readers who do not live in the house. The system checked is the same, but the findings have to be written clearly enough for a buyer, a seller and their agents to act on inside the contract dates.

Book it early in the inspection period. If the flue needs sweeping before it can be seen, or a finding needs a second look, the schedule still has room. The chimney inspection before buying a house guide covers the questions to ask during a purchase.

Inspection visits ranked by the time they take

From the shortest visit to the longest, with the same checklist applied to each:

• One flue, one wood-burning fireplace, an easy roof and a recent sweep.
• One flue that needs sweeping first so the liner can be seen.
• Any factory-built unit, with the chase top and the listed pipe checked against the maker's instructions.
• A chimney with two or more flues, or a fireplace plus another appliance.
• A leak investigation that follows water from the roof into the attic.
• A pre-purchase inspection on a tight deadline, with findings written for several readers.

Why an inspection is not a sweep or a repair

An inspection finds and explains. It does not remove deposits and it does not fix anything. When a flue is too dirty to see, sweeping comes first so the tile can be judged, and that sweep is priced separately. Repairs work the same way. A cracked crown or a loose flashing step becomes a written estimate naming the failed part, the cause and the proposed fix. Keeping the inspection apart from the repair price is what lets you weigh the finding on its merits.

What you should have in hand when the visit ends

By the end you should know what was checked, what was found and what each finding means for using the fireplace. We walk you through it on site and show you the problem wherever that is safe, such as the firebox, the damper or a crack visible from a ladder.

Any repair then goes on a free written estimate, with each line marked fix now or can wait. Nothing on it is scheduled until you say so.

The first inspection builds the record

A chimney seen for the first time has nothing on file: no record of its liner type, flue sizes, clearances or past repairs. The first inspection builds that record. Later yearly checks compare against it, which makes them quicker and makes any change easier to spot.