For commercial properties across Washington State, seagulls and swallows are more than a nuisance — they’re a source of real damage, health concerns, and liability. Gull droppings corrode roofing and equipment and create slip hazards, while swallow colonies plaster mud nests across building faces, entryways, and signage. The solution is exclusion: physically denying birds access to the ledges, roofs, and surfaces they want, using humane, professionally installed deterrent systems. There’s a critical catch, though — both gulls and swallows are protected under federal law, so timing and compliance aren’t optional.
Bird exclusion is a specialty service at Sasquatch Pest Control, and we provide it throughout Bellingham, Ferndale, Lynden, and the wider Whatcom County area — coastal territory where gulls and swallows are a constant pressure on commercial buildings.
Why are seagulls and swallows such a problem for commercial buildings?
On a commercial scale, a bird problem isn’t a few droppings — it’s an ongoing operational and liability issue. It comes down to the damage they cause, the health and safety risks they create, and the sheer persistence of the birds.
Property damage
Bird droppings are highly acidic and corrode roofing membranes, metal, paint, and building materials over time, shortening the life of expensive assets. Droppings and nesting debris clog gutters, drains, and rooftop equipment, and swallow mud nests damage and stain facades, signage, and entryways. Left unchecked, the cumulative damage translates into real repair and maintenance costs.
Health and safety risks
Accumulated droppings create genuine slip-and-fall hazards on walkways, entrances, and rooftops — a liability concern for any business with employees and customers. Droppings and nesting materials can also harbor pathogens and attract secondary pests that feed on the debris. In food-related or public-facing settings, visible bird activity is a serious hit to reputation and cleanliness standards.
Aggression and persistence
Nesting gulls can become territorial and even aggressive toward people near their nests, and both species return to the same successful nesting sites year after year. Without exclusion, the problem doesn’t resolve on its own — it compounds each season.
Why does the law matter here?
This is the single most important thing for a property manager to understand: seagulls and swallows are protected under the federal Migratory Bird Treaty Act. In practical terms, that means it is generally illegal to harm these birds, and once a nest is active — containing eggs or young — it typically cannot be disturbed or removed. Trying to solve a bird problem by destroying active nests or harming the birds isn’t just unethical; it can expose a business to serious legal consequences.
This is exactly why professional, exclusion-based bird management matters. Exclusion works by preventing birds from establishing in the first place and deterring them humanely — it doesn’t harm the birds. And because active nests are protected, timing is everything: the work has to be done outside of active nesting periods, before birds settle in or after young have fledged.
Once swallows or gulls have an active nest, your options narrow dramatically and legally. The window to install exclusion is before nesting begins — which is why planning ahead, rather than reacting after birds have moved in, is the difference between a straightforward solution and a season-long problem you can’t legally touch.
What does bird exclusion actually involve?
Exclusion is a toolkit, not a single product. The right solution depends on the building, the surfaces the birds are using, and which species you’re dealing with. Common professional methods include:
- Bird netting — heavy-duty netting that physically blocks birds from entering or roosting in courtyards, under eaves, loading docks, and structural voids. Highly effective for swallows and for enclosing larger spaces.
- Bird spikes — stainless steel or polycarbonate spikes installed on ledges, signage, beams, and railings to prevent landing and roosting. Effective for gulls on flat perching surfaces.
- Wire and post systems — tensioned wire deterrents that make ledges and parapets uncomfortable for larger birds like gulls to land on.
- Slope or exclusion barriers — physical modifications that eliminate the flat surfaces birds prefer.
- Surface deterrents — products that make ledges and other surfaces unappealing for landing.
For swallows specifically, netting under eaves and along the surfaces where they attach mud nests is often the go-to, installed before nesting season so they can’t establish. For gulls, spikes and wire systems on roofs, parapets, and signage deny them the perches they favor.
Can’t I just remove the nests or use scare devices myself?
It’s tempting, but it rarely works and can create legal exposure. Removing active nests can violate federal protections, as covered above. And DIY scare tactics — plastic owls, reflective tape, noise devices — tend to fail because birds habituate to them quickly; within days or weeks, they learn the fake predator never does anything and return to their preferred spot. These measures might provide brief relief, but they don’t solve a committed bird problem on a commercial building.
Effective, lasting bird management is physical exclusion, properly designed and installed for your specific building and compliant with the law. That’s a job for a professional who knows both the deterrent systems and the regulations that govern this work.
How does professional bird exclusion protect my property?
Done right, exclusion delivers protection on every front that makes birds a problem in the first place. It stops the ongoing corrosion and staining that shorten the life of your roof, facade, and equipment. It eliminates the droppings that create slip hazards and liability. It removes the debris that clogs drainage and attracts secondary pests. And because it’s built on prevention rather than reaction, it breaks the year-after-year cycle of birds returning to the same successful sites — protecting both your building and your reputation.
How Sasquatch handles commercial bird exclusion
Bird exclusion is a specialty for us, and we approach it the way serious commercial work demands: with a thorough assessment of your building to identify which species you’re dealing with, the surfaces they’re using, and the right deterrent systems for the job — planned around the legal timing constraints so the work is both effective and compliant. We handle gulls, swallows, and other problem birds on rooftops, ledges, signage, entryways, loading docks, and structural spaces.
Whether you manage a commercial building, warehouse, retail property, or other facility in the Whatcom County area, our approach is straightforward and honest: no scare tactics, no hidden fees, no contracts, and a 100% service guarantee behind the work. If birds are damaging your property, the best time to plan exclusion is before nesting season.
Frequently Asked Questions
Why are seagulls and swallows such a problem for commercial properties?
They combine real property damage with health, safety, and liability concerns. Their acidic droppings corrode roofing, metal, and paint and clog gutters and rooftop equipment, while swallow mud nests damage and stain facades, signage, and entryways. Accumulated droppings create slip hazards and can harbor pathogens and attract secondary pests. Both species also return to successful nesting sites year after year, so without exclusion the problem compounds every season rather than resolving on its own.
Is it legal to remove seagull or swallow nests myself?
Generally no, and this is the most important thing to understand. Seagulls and swallows are protected under the federal Migratory Bird Treaty Act, which means it’s typically illegal to harm the birds, and once a nest is active — containing eggs or young — it usually cannot be disturbed or removed. Attempting to solve a bird problem by destroying active nests can expose a business to serious legal consequences, which is exactly why professional, exclusion-based, legally compliant bird management matters.
Why is timing so important for bird exclusion?
Because active nests are legally protected, the window to install exclusion is before nesting begins — or after young have fledged. Once swallows or gulls have an active nest, your options narrow dramatically and legally, and you may be stuck with the problem until the season ends. That’s why planning ahead rather than reacting after birds have moved in is the difference between a straightforward solution and a season-long problem you can’t legally address.
What methods are used for professional bird exclusion?
Exclusion is a toolkit tailored to the building and species. Bird netting physically blocks birds from eaves, courtyards, loading docks, and voids — often the go-to for swallows. Bird spikes on ledges, signage, and beams prevent gulls from landing and roosting. Tensioned wire-and-post systems make parapets and ledges uncomfortable for larger birds, and slope barriers or surface deterrents eliminate the flat perching surfaces birds prefer. The right combination depends on which surfaces the birds are using.
Do scare devices like fake owls actually work?
Rarely, at least not for long. DIY scare tactics such as plastic owls, reflective tape, and noise devices tend to fail because birds habituate to them quickly — within days or weeks they learn the fake predator never does anything and return to their preferred spot. These measures might give brief relief but don’t solve a committed bird problem on a commercial building. Lasting results come from physical exclusion, properly designed and installed.
How does bird exclusion protect my building long-term?
It addresses every front that makes birds a problem: it stops the corrosion and staining that shorten the life of your roof, facade, and equipment; eliminates the droppings that create slip hazards and liability; removes the debris that clogs drainage and attracts secondary pests; and breaks the year-after-year cycle of birds returning to the same sites. Because it’s built on prevention rather than reaction, exclusion protects both the physical building and your business’s reputation.
Do you provide commercial bird exclusion in Whatcom County?
Yes — bird exclusion is a specialty service for us. We handle gulls, swallows, and other problem birds on rooftops, ledges, signage, entryways, loading docks, and structural spaces for commercial properties throughout Bellingham, Ferndale, Lynden, and the surrounding Whatcom County area. We assess your building, identify the species and surfaces involved, and install the right deterrent systems — planned around the legal timing constraints. No scare tactics, no hidden fees, and a 100% service guarantee.
Get Ahead of Your Bird Problem
If seagulls or swallows are damaging your Whatcom County property, the best time to plan exclusion is before nesting season. Call Sasquatch Pest Control at 360-410-2199 for a free inspection and an honest, compliant plan.
Sasquatch Pest Control offers honest, local, no-contract pest control — backed by our 100% service guarantee.Get a Free Quote