Sweep & inspection
Caps & crowns
Flue relining
Masonry repair
Gas fireplace serviceLevel 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
Styles & brands we work with
- Sweep & inspection
- Caps & crowns
- Flue relining
- Masonry repair
- Gas fireplace service
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After
Before
After
Before
AfterHow Much Does Chimney Cap & Crown Cost in St. Louis?
A chimney cap for a typical masonry flue in St. Louis usually runs $250 to $650 installed, and a crown rebuilt or resurfaced with a proper mortar mix typically runs $350 to $1,200 depending on size and how much of the old crown has to come off. A cast or copper cap over a large multi-flue chimney can push higher, and a full crown replacement with an overhang and a bonded seal at the flue edge sits at the top of that range. These are estimates for the St. Louis market in 2026. The written estimate you get after we look at the chimney sets the final price.
The short version: cap and crown are two of the least expensive parts of a chimney system to fix, and they do the most to keep water and animals out. Replacing a cracked crown costs a fraction of what a flue liner repair costs after water has been getting in for a few seasons. That’s the whole reason we push these two items on almost every inspection.
Key Takeaways
- Standard stainless or galvanized single-flue cap: $250-$450 installed
- Multi-flue or custom-fit cap: $400-$750 installed
- Copper cap: $700-$1,600+ installed
- Crown resurfaced with a flexible repair coating: $350-$800
- Crown rebuilt in mortar with a proper overhang: $800-$1,200
- Water coming through a bad crown is the most common cause of liner damage we find on inspections in St. Louis
Chimney Cap & Crown Cost Breakdown (2026)
Chimney cap pricing tracks the size of the flue and the material. A crown’s price tracks the square footage of the chimney top, the amount of old mortar that has to be cut away, and whether the whole crown gets rebuilt or just resurfaced. Here’s where things land in St. Louis this year.
| Item | Typical Installed Range | What It Covers |
|---|---|---|
| Single-flue stainless cap | $250-$450 | Standard 13×13 or round flue, mesh spark screen, anchored to the crown |
| Single-flue copper cap | $700-$1,100 | Solid copper, hand-built, sized to flue, whole cap and legs |
| Multi-flue cap (2 to 4 flues) | $400-$750 | Rectangular cap sized to a full chimney top, divided screens per flue |
| Custom multi-flue copper cap | $1,100-$1,600+ | Fabricated copper hood, sized and brazed to fit an irregular chimney top |
| Crown resurfacing with a flexible coating | $350-$800 | Old crown cleaned, cracks opened and filled, top coat applied and sealed at flue |
| Crown rebuilt in mortar | $800-$1,200 | Old crown cut off, new mortar crown poured or formed with correct slope and 2-inch overhang |
| Crown rebuild with cap install (same visit) | $1,000-$1,800 | Both jobs done together, saves the second setup and seal |
| Chimney inspection to diagnose | Free estimate | Top-to-bottom look at crown, flue, cap, and flashing before any price is given |
A few things move the number up. An irregular chimney top that isn’t square means a custom-fabricated cap rather than a stock one. A crown with a big crack running through the middle, or one that has separated from the flue entirely, has to be cut off and rebuilt rather than coated. Very tall chimneys need more ladder setup time. And if the crown problem has already gotten water into the flue, you may need liner repair too, which we quote separately once we’ve run a camera and seen the extent of it.
Prices come down when the crown is intact enough to resurface. A flexible repair coating takes a third of the labor of a rebuild and, applied properly with a bonded seal at the flue edge, holds for years. We tell homeowners which one makes sense after we’ve looked at the crown up close. Coating a crown that has already separated from the flue is a waste of money, and rebuilding a crown that only has hairline surface cracks is overkill. The estimate reflects the difference.
What Affects Chimney Cap & Crown Pricing in St. Louis
St. Louis weather is hard on chimney tops. Wet winters, freeze-thaw cycles that go through dozens of swings in a single season, and humid summers that hold moisture in a mortar crown all work against you. That drives more crown repairs here than you’d see in a drier climate, and it makes material choice matter.
- Flue count and shape. One flue, one cap. Three flues side by side, one fabricated cap with dividers. Odd angles and irregular masonry tops cost more because the cap has to be built to fit.
- Cap material. Galvanized steel is the cheapest but rusts out fastest in St. Louis humidity. Stainless steel is the mid-range choice. Copper costs more up front but won’t corrode and looks the way a brick home in St. Louis is supposed to look.
- Crown condition. Surface cracks get coated. A crown that has separated from the flue, or that sheds water toward the wall instead of away from it, needs to be rebuilt. The difference is hundreds of dollars.
- Roof pitch and access. A steep roof, a tight alley, or a chimney on a two-story ridge means more setup. We quote from what we see, not from a flat-rate sheet.
- Chimney height and overhang. Code calls for the crown to overhang the masonry by about 2 inches with a slope away from the flue. We build that in. A crown poured flush with the brick is the reason most of these fail in the first place.
- Existing animal guards or screens. If a cap is missing and you’ve had squirrels, birds, or raccoons in the flue, the cap needs to go on with a full mesh that seals the opening, not just a lid. That can add $50-$150 to a standard cap install.
One local factor that comes up more than you’d think: brick chimneys on older St. Louis homes. Bricks that have been in the same wall for many decades have softened, and the crown has to be tied into the flue and the top course in a way that doesn’t crack again next winter. On these chimney tops, a mortar crown built correctly beats a coating every time.
How to Save on Chimney Cap & Crown
Two jobs on one visit always cost less than two separate visits. If a crown needs work and a cap is missing or rusted, do both at once. The setup, the ladder time, and the seal at the flue edge are shared.
- Get the crown looked at before the cap goes on. A new cap installed over a cracked crown is a lid on a leaking bucket. Fix the crown first, then cap it.
- Go stainless instead of galvanized. Galvanized saves a few dollars up front and costs you a replacement cap within a decade in St. Louis humidity. Stainless is the smarter spend.
- Coat the crown while it’s still sound. A flexible coating applied before the cracks open wide costs a fraction of a rebuild and buys years.
- Bundle the crown with a sweep and inspection. If it’s been a while since the flue was cleaned, doing the sweep on the same visit as crown and cap work means one trip, not two.
- Ask for the written estimate before anyone starts. We don’t do verbal pricing. The number on the sheet is the number on the invoice, and there’s no charge for the estimate.
If you’re not sure what you’re dealing with, call (866) 596-7310. Estimates are free, and we’ll tell you honestly whether a crown coating will hold or whether a rebuild is the right call. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
Chimney Caps and Crowns: What Each One Does
A cap sits on top of the flue and keeps out rain, snow, birds, squirrels, and sparks. A crown is the mortar or concrete cap over the whole chimney top, brick and all, and its job is to shed water away from the masonry and away from the flue. The two work together. A bad crown lets water soak the chimney from the top down. A missing cap lets it pour straight into the flue.
On a masonry chimney, the crown takes the brunt of St. Louis weather. Freeze-thaw cycles open hairline cracks, water gets in, the crack grows, and eventually the crown separates from the flue and water starts tracking down beside the clay tile. That’s when a cheap fix becomes an expensive liner repair. The cap is the windshield. The crown is the roof. Neither works if the other is compromised.
On a prefab chimney the calculation is simpler. There’s rarely a crown to rebuild. The cap does the whole job, and the concern is fit and secure anchoring so the wind off the Mississippi doesn’t take it. We size prefab caps to the manufacturer’s flue collar and anchor through the top plate, not through a loose sheet metal screw into whatever’s nearby.
Signs You Need a New Chimney Cap
Cap problems are easy to miss from the ground. From the roof, they’re obvious. Here’s what tips us off during a hawk-eyed inspection.
- Rust streaks running down the outside of the chimney. That’s a galvanized cap reaching the end of its life.
- Birds or squirrels in the firebox, or nesting debris visible in the flue from the top or bottom.
- A cap that’s loose or leaning. Wind gets under a loose cap and eventually it goes off the roof.
- Mesh screens that have rusted through or blown out. An intact cap frame with missing mesh is no cap at all.
- Water stains on the firebox ceiling, or a damp smell on the first cool evening of fall.
If you see any of these, get the cap replaced before the next storm season. A cap is $250-$450 in most cases, and it prevents a repair that runs into the thousands.
Signs a Chimney Crown Needs Repair or Replacement
A crown that’s shedding water properly looks like a smooth, sloped top that projects past the brick and cracks only at the flue edge, if at all. Here’s what a bad crown looks like.
- Cracks wider than a hairline that run out to the edge of the chimney top.
- A crown that sits flush with the brick instead of overhanging. Water runs off directly onto the brick face.
- Spalling on the bricks just below the crown. That’s water from the crown face getting into the top course.
- A visible gap between the crown and the clay flue tile, which lets water run straight down the outside of the tile.
- A crown that’s crumbled or chipped away at the corners, or that’s clearly been patched with the wrong material before.
On a masonry chimney in St. Louis, water through the crown is the number one cause of a failed flue liner we find on inspection. If the crown has been failing for years, the liner likely needs to be assessed too. That’s where our full-system approach matters, because a sweep-only operation doesn’t see the liner damage and a crown-only mason doesn’t fix it.
Chimney Cap and Crown Repairs in St. Louis
We work on chimneys across the city. The older masonry stock in neighborhoods like St. Louis and its surrounding communities means we see a lot of crowns that have been in place for decades and a lot of caps that have never been replaced. Both are fixable. Neither is urgent in the way a flue fire is urgent, but both get more expensive the longer they wait.
Our technicians have up to 12 years of experience, and we install caps and crown materials from professional brands: DuraFlex, HeatShield, Gelco, Olympia Chimney, Famco, and Copperfield. That matters for caps because a custom-fabricated cap has to be sized and sealed properly, and for crowns because a flexible repair coating is only as good as the system it’s applied with. HeatShield resurfacing is a repair method most sweep-only companies aren’t equipped to perform, and it can save a crown that would otherwise need to come off.
We do all three services under one roof: sweep, inspect, and repair. That means one company to call, one estimate, and one responsible party if a crown rebuild or a cap install ever needs a follow-up. No handoff.
FAQs: Chimney Cap & Crown Cost
How much does a chimney cap cost in St. Louis?
A standard single-flue chimney cap in St. Louis in 2026 typically costs $250-$450 installed. A multi-flue cap runs $400-$750, and a custom copper cap can run $700-$1,600 or more depending on size. Call (866) 596-7310 for an exact quote on your chimney. Estimates are free.
How much does it cost to replace a chimney crown?
A crown rebuilt in mortar in St. Louis typically costs $800-$1,200, and a crown resurfaced with a flexible repair coating runs $350-$800. Most crowns can be coated if they’re still attached to the flue. A crown that has separated or is shedding water toward the wall needs to be rebuilt. We tell you which one after we’ve looked at it.
Is it cheaper to repair or replace a chimney crown?
Repair is cheaper when it works, and that means resurfacing a crown that’s still structurally attached to the flue. Expect $350-$800 for a coating versus $800-$1,200 for a full rebuild. The mistake is coating a crown that has already separated from the flue. It looks fixed from the ground and leaks the following winter.
Can you install a chimney cap the same day?
Yes, in most cases. A standard cap sized for your flue can usually go on the same visit as the inspection. Custom-fabricated caps and copper caps need time to build, so those get scheduled after the estimate. Call (866) 596-7310. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
Does a chimney cap or crown problem cause other damage?
Yes, and this is the reason we push both items on every inspection. A failed crown lets water into the brick and the top of the flue, which causes spalling, liner cracks, and eventually a flue liner replacement that starts around $1,500 and climbs from there. A missing or rusted cap lets rain, animals, and debris straight into the firebox. Both are cheap compared to the repair they prevent.
Do I need a chimney inspection before getting a cap or crown priced?
Yes, and ours is free with the estimate. A cap and crown estimate without looking at the chimney is a guess. The hawk-eyed inspection covers the cap, the crown, the flue, the firebox, and the flashing top-to-bottom so the price is built on what’s actually there. Call (866) 596-7310 to get on the schedule.
What Happens When You Call
You call, we ask a few questions about the chimney, and we book a visit. On site, we look at the crown and cap before we quote anything. The estimate is written and free, and it separates the cap, the crown, and any liner or flue work so you can see exactly what you’re paying for. If a crown coating will hold, we’ll say so. If it won’t, we’ll explain why.
We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. A call outside dispatch hours is booked into the next opening, Sunday through Friday, 7am to 7pm. We’re closed Saturday.
One safety note, because a crown and cap put you on a roof: this is not a job to do yourself. Heights, ladders, and roof pitch are the reason chimney work sends people to the emergency room. Get a trained professional on the roof. The cap installs and crown work we do are covered by our workmanship, and you don’t need to be on the roof to get them done.
Ready for a Straight Answer on Your Chimney?
Hawk Chimney Sweep handles the cap, the crown, the flue, and the firebox as one system. From cap to firebox, we inspect, we quote, and we do the work. Our technician experience goes up to 12 years, our materials come from DuraFlex, HeatShield, Gelco, Olympia Chimney, Famco, and Copperfield, and we quote per job from a written estimate.
Call (866) 596-7310 for a free estimate on your chimney cap and crown. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. One call gets you a full inspection, a straight price, and the work scheduled.
Pricing reflects the St. Louis market as of 2026. Hawk Chimney Sweep offers free estimates – call (866) 596-7310.
Written by the team at Hawk Chimney Sweep.
What Our Customers Say
"Swept it, capped it, and installed a proper damper. The downdraft smell in the summer that we'd lived with for years is gone."
- Nathan Schaefer"Work is good and the price was fair. The scheduling was a little loose, the window they gave me was pretty wide and he showed up at the back end of it. Once he was here he was quick and knew what he was doing."
- Jodi Quinn"Good work. The written inspection report took about a week to arrive after I asked for it, which was slower than I expected."
- Danielle Hayes