If you hear scratching, chirping, or fluttering inside your chimney, the solution depends on whether the bird is trapped or nesting. A trapped bird needs immediate help getting out. A nesting bird, most commonly a chimney swift, is federally protected and cannot legally be removed until the young have left on their own. Here’s how to handle both situations and prevent birds from returning.
Figure Out What You’re Dealing With
The sounds tell you a lot. A single bird frantically flapping and scratching is likely trapped and can’t find its way out. This happens when birds fall down the flue or enter through an uncapped chimney and end up stuck above the damper. Starlings, sparrows, and pigeons are common culprits.
If you hear chattering, high-pitched begging calls during the day, and the sound of wings coming and going, you almost certainly have chimney swifts nesting. These small, cigar-shaped birds arrive in the U.S. in March or April to breed and leave by August or September, migrating to South America for the winter. They build tiny nests of twigs glued to the inside chimney wall with saliva. The loud begging calls from nestlings only last about three weeks before the young birds fledge and leave.
Knowing which species you have matters because it determines what you can legally do.
Chimney Swifts Are Federally Protected
Chimney swifts are covered under the Migratory Bird Treaty Act, which makes it illegal to remove or disturb them, their nests, eggs, or young during the breeding season. This isn’t a technicality. Violations carry real penalties. No licensed wildlife professional will remove an active chimney swift nest, and you shouldn’t attempt it yourself.
The good news is that swift nests are temporary. The entire noisy period, from egg-laying through fledging, wraps up within a few weeks. If the begging calls bother you, stuff foam rubber (not fiberglass insulation) above the damper in your fireplace to muffle the sound. Just remember to remove it once the birds have gone.
Are They a Safety Risk?
Less than you’d think. Chimney swift nests measure only about four inches across and are made of a few small twigs. They contain very little combustible material. Even if one somehow ignited, it would likely just drop harmlessly into the fireplace. The birds themselves don’t carry histoplasmosis. That fungus grows in soil or areas where large amounts of droppings have composted over years, like barns or caves. A single season of swift droppings in a maintained chimney poses essentially no disease risk.
The real fire hazard in any chimney is creosote buildup from burning wood. Annual chimney cleaning removes both creosote and old swift nests, keeping everything safe.
How to Free a Trapped Bird
A bird that’s fallen into the flue and can’t get back out needs a different approach. Don’t light a fire or try to smoke it out. That will kill the bird and could push dangerous fumes into your home if the flue is partially blocked.
Try this instead: close all the curtains and turn off every light in the room with the fireplace. Open a door or window to the outside, then open the flue damper. The bird will see the bright rectangle of the exit and fly toward it. This works surprisingly well, especially during daylight hours.
If the bird comes down into the fireplace but won’t leave the room, you can gently guide it toward the open door. Stay calm and move slowly. A panicked bird that’s been trapped for hours may be weak or disoriented.
If the light trick doesn’t work and the bird remains stuck above the damper, contact a licensed wildlife rehabilitator or nuisance wildlife control officer in your area. Don’t try to reach into the flue yourself. The space is tight, the bird is stressed, and you risk injuring it or getting scratched and bitten.
What Professional Removal Costs
Standard bird removal from a chimney runs between $100 and $300. If there’s an active nest involved (from a non-protected species like a pigeon or starling), costs can climb higher, sometimes up to $2,000 depending on the complexity. Chimney-specific removal jobs typically fall in the $180 to $560 range. Species matters too: pigeon removal can range from $100 to $3,000 for large infestations, while sparrows and robins usually stay under $500.
When hiring a professional, look for someone licensed for nuisance wildlife control in your state. A general pest control company may not have the right permits or experience with birds.
Cleaning Up After the Birds Leave
Once you’re sure all birds have left your chimney, schedule a professional chimney sweep before your next fire. The sweep will remove old nesting material, droppings, and any creosote buildup. This is especially important if you burn wood, since old nests combined with creosote create unnecessary fire risk. Do not use your fireplace until the chimney has been inspected and cleared.
Preventing Birds From Coming Back
A chimney cap is the single most effective prevention measure. It covers the top of your flue with a metal hood and mesh screen that keeps birds, squirrels, raccoons, and debris out while still allowing smoke and gases to vent properly.
The industry standard mesh size is 3/4 inch, which is tight enough to block birds and most animals but open enough to maintain good airflow and draft. In drier climates, particularly California and Oregon, local codes require a tighter 5/8-inch mesh. Going tighter than that can restrict draft too much. When installed, the cap’s hood should sit about six inches above the top of the flue to allow adequate ventilation.
Caps come in stainless steel, galvanized steel, and copper. Stainless steel lasts the longest and resists corrosion. A basic cap costs $50 to $200 for the hardware, with professional installation adding another $100 to $300 depending on your roof’s pitch and accessibility. It’s a one-time investment that eliminates the problem permanently.
The key timing detail: install the cap after the birds have left, not while they’re still inside. For chimney swifts, that means waiting until September or later. Capping a chimney with birds still inside traps them, which is both inhumane and, in the case of protected species, illegal.