Do I Need a Chimney Inspection Before Selling My House?

A general home inspection covers the whole house in a few hours, and the chimney is one item on a long list. The inspector looks at it from the ground, sometimes from the roof edge, and sometimes from inside the firebox with a torch. That is the standard, and it is not a criticism — it is simply what a general inspection is.

What that vantage point cannot reach is the inside of the flue. The liner, which is the part doing the actual safety work, is not visible without a camera. Neither is the condition of the smoke chamber above the damper, nor what the crown looks like from above, nor whether the flashing is sealed or merely caulked over.

So the chimney line in the report tends to read the same way on house after house: some variation of recommend evaluation by a qualified chimney professional. It is not the inspector hedging. It is an honest statement that this part of the house was outside what they were able to assess.

By the time the buyer's inspection report exists, there is an accepted offer, a timeline, and a buyer who has started imagining living there. A sentence recommending further evaluation lands into that situation as an unknown, and unknowns get priced defensively.

What follows is familiar to anyone who has sold a house here. The buyer asks for an evaluation or a credit. There is no time to shop around, so whoever can come this week sets the number. And because nobody knows yet whether the job is a sweep or a reline, the figure that gets negotiated is usually the pessimistic one.

The same chimney, looked at before the house went on the market, is a scheduled appointment with time to get a second opinion and time to do the work properly. The difference is rarely about the repair. It is about who is holding the clock.

In the City and the older inner suburbs — Tower Grove, University City, Webster Groves, Maplewood — most chimneys were built before 1940 with soft lime mortar, and many are unlined or lined with clay tile that has cracked with age. Freeze-thaw cycling here is severe, and the crown is usually where it shows first. A great many of these homes also have several flues in one stack, with only one of them ever relined.

In the post-1985 subdivisions — Chesterfield, Ballwin, the St. Charles County side — the chimney is usually not masonry at all. It is a framed and sided chase with a metal firebox and metal flue inside it, and its service life is roughly 20 to 30 years. A large number of them are reaching that now, and the part that fails first is the flat metal chase cover, which lets water run down inside the chase where nobody can see it until a ceiling stains.

Neither of those is visible from the ground, and both are the sort of thing that reads alarmingly in an inspection report when discovered late and reads as routine maintenance when discovered early.

The same logic runs in reverse. If you are buying a house with a fireplace, the chimney is one of the few systems where the general inspection genuinely cannot tell you what you are taking on, and it is one of the more expensive things to discover afterwards.

A separate chimney inspection during the option period costs a fraction of what a reline costs, and it either gives you a clean report or gives you a specific number to negotiate with rather than an unknown. Sellers respond very differently to a photograph of a cracked liner than to a general worry.

Our inspection is a flat 69 dollars anywhere in the St. Louis metro, with no trip charge. It covers the flue with a camera, the crown, the cap, the flashing, the firebox and smoke chamber, and the draft, and you get a written report with photographs.

The report is written to be handed to somebody else. That matters more than it sounds: a report an agent or a buyer can read and understand is what turns a vague worry into a settled item. If work is needed you get one fixed price in writing, and the 69 dollars comes off it in full.

If nothing is wrong, the report saying so is the thing you actually paid for. A buyer's inspector writing recommend evaluation is much easier to answer when you can hand over photographs of the inside of the flue taken last month.