Can I Clean My Chimney Myself, or Should I Hire a Professional?

By the Miles Chimney Sweep team · Published Aug 21, 2026

Yes — you can brush the parts of your chimney you can reach, and that is exactly the problem. The deposits that start chimney fires build up where you can't see them from the firebox: in the smoke chamber, on the smoke shelf, and along the upper flue. A hardware-store brush kit removes loose soot, but it does little against hardened, glazed creosote, and it can't tell you whether the flue liner behind those deposits is intact. So the honest answer is that DIY brushing is a supplement, not a substitute.

Here's the distinction most articles skip: what you're really buying from a chimney professional isn't elbow grease — it's verification. A DIY job ends with "I ran a brush up it." A professional visit ends with someone who has examined the entire system telling you what condition it's actually in. Those are very different things to bet a house on.

What a Brush Kit Cleans — and What It Skips

Chimney brush kits are real tools. Used from the firebox on a straight, accessible flue, they will knock down loose, powdery soot — and if that were all creosote ever was, this article would be three sentences long.

What the kit skips is most of the system. The smoke chamber, the angled area just above the firebox, is awkward to reach and rarely gets fully cleaned in a DIY job. The smoke shelf behind the damper collects everything the brush knocks loose. Offsets and bends hold deposits a straight push slides right past. And the top of the flue, the cap, and the crown can only be reached from the roof — work we deliberately won't give instructions for — a fall is a far more immediate danger than dirty masonry. Professionals bring fall protection, correctly sized rods, and dust containment for exactly that reason.

The Three Forms of Creosote — Only One Brushes Out

Creosote forms when wood smoke cools and condenses inside the flue, and it does not stay one substance:

• First stage: light, flaky soot. This is what brushes remove easily.
• Second stage: crunchier, tar-flecked deposits. Tougher, but still mechanically removable.
• Third stage (glazed): a shiny, hardened layer that looks like poured tar. An ordinary brush essentially polishes it. It's also the most flammable form, and clearing it takes professional creosote removal with specialized equipment.

The catch: from the bottom of a dark flue, you cannot reliably tell which stage sits twenty feet up — or whether the brushing you just finished cleaned the flue or merely burnished the dangerous layer it left behind.

What You Genuinely Can Do Yourself

Plenty — just nothing that requires a roof or a verdict:

• Scoop cooled ashes into a covered metal container and store it outside, away from the house.
• Sweep loose soot from the firebox walls and clean the glass, all at hearth level.
• Burn only dry, seasoned wood — under 20 percent moisture. An inexpensive moisture meter ends the guessing.
• Build hot, active fires instead of long smoldering ones; smolder is what paints the flue.
• Never burn household trash, painted or treated wood, plywood, or glossy paper.
• Keep working smoke and carbon monoxide alarms on every level of the home.
• Shine a flashlight up past the damper occasionally — not to diagnose, but so you notice when something changes.

Signs the Job Is Already Past DIY

• Shiny, black, tar-like buildup visible above the damper, or hard black flakes dropping into the firebox.
• Soot thickness approaching an eighth of an inch anywhere you can see it.
• A strong campfire or asphalt smell indoors — often at its worst during long Puget Sound rainy stretches, because humidity amplifies creosote odor.
• Smoke drifting into the room even with the damper fully open.
• Scratching, chirping, or nesting material in the flue. Stop here: many birds, including chimney swifts, are federally protected, and removal timing and methods are legally restricted.
• Puffy, honeycomb-textured creosote or warped metal — possible evidence a chimney fire already happened without you knowing it.

Any one of these is a reason to book a chimney inspection before your next fire, not after it.

What a Professional Actually Does Differently

A professional visit is not just a bigger brush. The sweep mechanically cleans the full flue, the smoke chamber, and the smoke shelf with the mess contained — then does the part no kit includes: an inspection. Liner condition, cap and crown, flashing, obstructions, evidence of past overheating. The visit ends with a verdict, and some years that verdict is "your flue doesn't need sweeping yet." That's the industry standard working as designed: inspection happens annually; cleaning happens when the deposits call for it.

One honest limit worth knowing: if a sweep suspects a cracked liner or a hidden leak path, nobody can confirm that by eye from the hearth. It takes an on-site examination, often with a camera run the length of the flue. Be wary of anyone who offers a firm diagnosis from the driveway.

What It Costs — Both Ways

A rod-and-brush kit costs less up front than a service visit; that gap is real. What the kit price doesn't include is the inspection — where the problems that actually wreck chimneys, like water intrusion, liner gaps, and failing crowns, get caught while they're still small.

Professional pricing varies by region and changes over time, so treat any figure as a rough guide. The big variables: flue height and accessibility, the creosote stage (glazed removal is far more work than brushing soot), how long the system went between cleanings, and whether repairs turn up. A routine sweep paired with an inspection generally lands in the low hundreds of dollars in most markets; heavy glazed-creosote removal runs more.

The Cheapest Option Nobody Advertises: Slower Creosote

The less creosote you make, the less anyone — you or a pro — has to remove. Burn dry, seasoned wood below 20 percent moisture, which around Puget Sound means stacking it off the ground with only the top covered, because a woodpile left open to a Seattle fall can stay damp for a year. Wet wood burns cool and smoky, and cool smoke is precisely what condenses into creosote. Favor hot, active fires over overnight smolders, skip the trash and treated lumber entirely, and keep the annual inspection appointment. For a deeper look at scheduling, see how often your chimney should be swept.

And when the flue does need attention, have it done properly once instead of half-done twice — call 866-309-2130 and let someone put eyes on the whole system.

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