Should you repair or replace your chimney?
Updated August 2026
← Every repair-or-replace call
Repair a chimney that still stands plumb with sound brick, and rebuild only when the brick spalls through, the stack leans, or the flue liner has cracked. Tuckpointing eroded mortar joints costs $500–2,500, a new crown $300–1,000, and a cap plus flashing another $300–1,000 together. Those three items resolve most chimney leaks. A partial rebuild of everything above the roofline runs $1,000–3,500, and a rebuild from the footing up is $4,000–15,000 or more. The liner is the one component where a crack is a safety matter rather than maintenance.
The short version
A masonry chimney is two things stacked together: a structure and a flue. The structure fails slowly and visibly. Mortar joints erode, the crown cracks, water gets in, and freeze-thaw cycles pop the faces off the bricks. Caught at the mortar stage, a repoint at $500–2,500 resets the clock for 20 years or more. Left until the brick faces flake off and the stack shows a lean, the masonry has lost its bond and fresh mortar has nothing to bite, so the section above the roof comes down and goes back up. The flue gets judged on different terms. A cracked clay liner lets heat and combustion gas reach framing and can push carbon monoxide into the house, so stop using the fireplace until it is inspected. Relining in stainless steel costs $2,500–7,000 and usually beats a rebuild.
Your situation, decided
| Situation | Verdict | Why |
|---|---|---|
| Mortar joints crumbling, brick faces intact | Repair (tuckpoint) | A $500–2,500 repoint buys 20+ years on a sound stack |
| Cracked crown letting water into the brick | Repair | A $300–1,000 crown, and the cheapest leak fix available |
| Ceiling stains around the chimney chase | Repair (flashing) | Flashing at $300–1,000 fails long before the masonry does |
| Brick faces flaking off across the stack | Rebuild above the roofline | Spalled brick has no sound face left for new mortar |
| Chimney leaning or separating from the wall | Rebuild | A structural failure; a leaning stack can come down |
| Cracked clay flue liner | Reline, and stop using it now | A fire and carbon-monoxide risk; relining is $2,500–7,000 |
What each path costs
Repairs typically run $500–2,500; a replacement is $4,000–15,000 installed. Brick chimneys last 50–100 years, but the crown, cap, and mortar need attention every 20–30. A clay liner rated for the life of the chimney still cracks after a chimney fire. Price your own number on the home maintenance cost calculator before you commit either way.
The repair-or-replace call is easy when you know the unit's age and service history. OnOtto keeps both, plus the maintenance that delays this decision for years.
Start your home's service log, freeFrequently asked questions
What is spalling, and does it condemn the chimney?
Spalling is brick faces popping off in flakes and chips. Water soaks into the brick through failed mortar or a cracked crown, freezes, expands, and pushes the fired outer surface away from the soft core. It condemns the affected bricks, not always the chimney. A few spalled bricks near the top get cut out and replaced during a $500–2,500 repoint. Spalling across the whole exposed stack means no sound face remains, and everything above the roofline comes down.
How do I know if the flue liner is cracked?
Not from the ground. A Level 2 inspection runs a camera the length of the flue for $200–500, and it is the standard check after a chimney fire, after an earthquake, and before buying a house. Signs visible from below include chunks of clay tile in the firebox, a lingering smoky smell, and heat on the wall beside the chimney. Book that inspection once a year if you burn wood, and stop using the fireplace until a suspected crack is ruled out.
Is a chimney cap worth installing on a fireplace I never use?
Yes, and it may be the best $200–600 you spend on a chimney. An open flue is a funnel: rain drops straight onto the smoke shelf and damper, rusting the steel and soaking the masonry from inside, and birds and raccoons nest in it. A cap with a spark arrestor stops all of that. Pair it with a sound crown and most of the water damage that drives chimney rebuilds never starts. The chimney checklist covers the rest.