Chimney Animal & Nest Removal in San Francisco, CA

Common Chimney Wildlife in San Francisco

Birds & Chimney Swifts

Chimney swifts are a protected migratory bird species that nest in chimneys. They cannot be legally removed during nesting season (typically April through October). After the nesting season ends, we remove the old nest material and install a chimney cap to prevent future nesting. Other birds including starlings, pigeons, and house sparrows can be removed year-round.

Raccoons

Raccoons commonly denote in chimneys during late winter and early spring. A mother raccoon with kits requires special handling — we coordinate with wildlife control specialists when young are present and handle nest material removal and cleaning afterward.

Squirrels

Squirrels frequently fall into chimneys or enter through uncapped flues. Trapped squirrels can be removed and the chimney cleaned of nest material and debris.

Bats

Bats in chimneys require careful handling as they are a protected species in California. We coordinate appropriate removal procedures and seal the chimney after any bat colony has vacated.

Our Process

1. Inspection to determine species, location, and presence of young
2. Humane removal appropriate to species and season
3. Complete cleaning of nest material, droppings, and debris from chimney
4. Chimney inspection for any damage caused by wildlife
5. Chimney cap installation to prevent future entry

The Fire and Health Hazards of Chimney Animal Nests

It's tempting to think of a bird nest or a pile of leaves in the chimney as a minor annoyance — something you'll deal with eventually. But the reality is that animal nests in chimneys are a significant fire and health hazard, and the longer they're left in place, the greater the risk to your household.

Here's why nests in chimneys are genuinely dangerous:

• Extreme fire risk: Bird nests are made of dry twigs, grass, leaves, feathers, and other highly combustible materials packed tightly into the flue. A single ember from a fire below — or a spark from a neighboring fireplace — can ignite a nest and cause a chimney fire that spreads to the surrounding framing. Raccoon and squirrel nests are similarly combustible.
• Complete flue blockage: A large nest or a nest combined with debris accumulation can completely block the flue. When you light a fire in a blocked chimney, combustion gases — including carbon monoxide — have nowhere to go except into your living space. This is one of the leading causes of CO poisoning from fireplaces in San Francisco.
• Parasites and disease vectors: Animal nests harbor fleas, mites, ticks, and lice. When animals vacate (or die) in the chimney, those parasites look for new hosts — which can mean you, your family, or your pets. Bird droppings carry Histoplasma capsulatum, a fungal pathogen that causes histoplasmosis, a serious respiratory disease. Raccoon feces can contain Baylisascaris procyonis, a roundworm parasite dangerous to humans.
• Structural damage: Raccoons and squirrels don't just nest in chimneys — they scratch and dig at the mortar joints, damaging the flue liner and chimney interior over time. Large animal activity can dislodge clay liner tiles, creating the same fire-path hazard as a cracked liner.
• Persistent odors: Dead animals, urine, feces, and decaying nest material create persistent, extremely unpleasant odors that permeate the home. Activated-odor eliminator sprays don't solve this — the source has to be physically removed and the surfaces sanitized.

If you have any reason to suspect an animal or nest is in your chimney, do not use the fireplace until a professional has inspected and cleared it. The risk is simply too great.

Humane Removal: How We Handle Wildlife

AL Chimney Service takes a humane, species-appropriate approach to all chimney wildlife situations. We don't set traps that can injure animals, and we don't use chemical deterrents that can be harmful to wildlife or leave residues in your home. Our approach depends on the species, the season, and the specific situation.

Birds

For common birds like starlings, house sparrows, and pigeons — which are not protected under the federal Migratory Bird Treaty Act — we can remove nests, clean the flue, and install a cap year-round. The Chimney Swift, however, is a federally protected migratory bird. Chimney swift nests and eggs cannot be disturbed during the active nesting season. We will inspect, confirm the species, and advise you on the appropriate timeline. Once the swifts depart in October, we remove the nest material, clean the chimney, and install a cap to prevent the following year's nesting.

Raccoons

Raccoons — especially mothers with kits — require careful handling. Mother raccoons are fiercely protective of their young, and attempting DIY removal is genuinely dangerous. We assess the situation, determine whether kits are present, and develop a removal plan. In cases involving young raccoons, we may recommend waiting until the kits are mobile enough to leave on their own, then installing the chimney cap once the family has vacated. We coordinate with licensed wildlife removal specialists when direct animal handling is required.

Squirrels

Squirrels typically fall into chimneys accidentally through uncapped flues. A trapped squirrel can often be encouraged to exit upward using a rope or a board as a ramp — if the situation is caught early. If the animal has been trapped for a significant time, it may be too exhausted to climb out and requires direct removal. We handle this carefully and humanely, then clean the chimney of any nest material or debris before installing a cap.

Bats

Bats are protected under California law, and bat colonies cannot be removed or disturbed during their active roosting season (generally May through August). We inspect and advise on bat situations and can install exclusion devices at appropriate times. After a colony has vacated, we perform a thorough cleaning and install the appropriate chimney cap to prevent re-entry.

What to Do If You Hear Animals in Your Chimney

Hearing scratching, chirping, fluttering, or shuffling sounds coming from your fireplace or chimney is unsettling — especially when it happens at night. Here's what to do and, equally important, what not to do:

1. Keep the damper closed. If the damper is open and there's an animal in the flue, it can drop or climb into your fireplace and then into your living space. A raccoon or squirrel loose in your home is a chaotic and potentially dangerous situation.
2. Do not light a fire. The instinct to smoke out the animal is understandable but dangerous. It can cause the animal to panic and force its way through the damper, it may kill or injure the animal, and if there's a nest, it can ignite immediately.
3. Do not pour water down the chimney. This doesn't help and can cause damage to the chimney interior and any appliances at the base.
4. Note what you hear and when. This information helps us identify the species — nocturnal sounds suggest raccoons or bats, while daytime activity suggests squirrels or birds.
5. Call AL Chimney Service. We are available 24/7 for urgent situations. We will advise you over the phone on immediate steps and schedule a service call as quickly as possible.

After Removal: Sanitization and Prevention

Getting the animal out of the chimney is only part of the job. What happens after removal is just as important — both for your health and for preventing the same problem from recurring next season.

After removing the animal and all nest material, we perform a thorough chimney cleaning and sanitization:

• Complete removal of all nest material, feathers, feces, and debris from the flue and firebox
• Application of an enzyme-based sanitizing treatment to neutralize pathogens and eliminate odors at the source
• Video inspection of the flue liner to identify any animal-caused damage — scratched mortar joints, dislodged tiles, or cracked liner sections
• Assessment of the firebox and smoke chamber for debris that has fallen from the flue
• Identification and documentation of any structural repairs needed as a result of animal activity

We provide a written report of everything found and everything done, which is useful for insurance purposes and for any follow-up repair work.

Why a Chimney Cap Is Non-Negotiable After Removal

Installing a chimney cap immediately after animal removal is not optional — it's the essential final step that prevents the problem from recurring. An uncapped chimney is an open invitation to every bird, squirrel, and raccoon in your San Francisco neighborhood. Once an animal has successfully nested in a chimney, that location becomes established as a safe shelter site. Without a cap, you will almost certainly have the same problem again the following season.

A quality chimney cap provides multiple layers of protection:

• A solid top cover keeps rain, snow, and debris out of the flue — San Francisco's coastal weather means your chimney is frequently wet, and moisture infiltration is a major cause of interior deterioration
• A heavy-gauge wire mesh sides prevent animals from entering while allowing combustion gases to exit freely
• Properly sized caps maintain adequate draft without restricting flue draw
• Stainless steel construction resists the corrosion that shortens the life of galvanized caps, especially important given the salt air environment in San Francisco

We stock stainless steel chimney caps in all standard flue sizes and can fabricate custom caps for unusual flue configurations on the spot in most cases. Cap installation is included in our animal removal service at no additional charge — because a removal without a cap isn't a complete solution.

If you're hearing something in your chimney, or if you know your chimney doesn't have a cap, call AL Chimney Service today. We serve all San Francisco neighborhoods and are available 24 hours a day, 7 days a week for urgent situations.