Bird-safe glass for Office TowersUniversity CampusesHospitalsGovernment BuildingsHistoric BuildingsPhiladelphia Rowhomes .
Window Film Philadelphia is an authorized Bird Divert installer serving Philadelphia, the Main Line, South Jersey, and surrounding suburbs. ABC-certified UV-reflective film that stops bird strikes on commercial and residential glass — nearly invisible, immediately effective.
Bird Divert is a durable UV dot matrix system — optically clear to the human eye — designed to prevent birds from colliding with windows and glass surfaces. The system applies two sizes of UV-absorbing and UV-reflective dots directly to glass at a precisely engineered spacing. Humans see nothing. Birds see a matrix of UV signals that reads as a physical obstruction and triggers avoidance. That's the whole system — no tint, no visible pattern, no change to how the glass looks from inside or outside your Philadelphia building.
Window Film Philadelphia is an authorized installer of Bird Divert window film in Philadelphia. The system uses 20-nanometer hollow glass spheres that reflect UV wavelengths up to 420 nm — the part of the light spectrum most birds see and humans do not. Applied in a precise dot pattern of 0.25" absorbing dots paired with 0.375" absorbing/reflective dots, Bird Divert is rated for 10-year durability and carries a 6-year warranty. Every installation is documented for ABC certification compliance and LEED credit submissions.
Philadelphia's authorized Bird Divert installer — UV dot matrix system, ABC-certified, 10-year durability
Philadelphia sits at the intersection of the Atlantic Flyway and one of the densest concentrations of reflective commercial glass on the East Coast. During spring and fall migration — when hundreds of millions of birds move through the region — the city's office towers, university campuses, and institutional buildings create a collision gauntlet that kills birds at a rate that is both measurable and preventable. "Building glass kills hundreds of millions of birds every year — it is one of the top direct human-caused sources of bird mortality," according to the Bird Divert manufacturer. As a Bird Divert film installer for Philadelphia properties, Window Film Philadelphia brings a solution that works at the glass level — no structural changes, no replacement glass, no visible impact on the building from the inside.
Every Philadelphia building has different glass, different visibility requirements, and different design standards. Bird Divert window film in Philadelphia is available from Window Film Philadelphia across a full range of ABC-certified bird-safe options — from near-invisible UV markers to architecturally designed patterned solutions.
UV Dot Markers Bird Divert is a durable UV dot matrix system — optically clear to the human eye — designed to prevent birds from colliding with windows and glass surfaces. The system places two sizes of UV-active dots directly on glass: 0.25" absorbing dots and 0.375" absorbing/reflective dots. The technology uses 20-nanometer hollow glass spheres that reflect UV light up to 420 nanometers. Birds see the matrix as a physical barrier. People see ordinary glass. There is no tint, no coating visible in normal lighting, and no change to the appearance of the building from inside or outside.
The near-invisible result makes Bird Divert the right specification for Philadelphia buildings where aesthetics are non-negotiable: Class A office towers, historic buildings in Old City and Society Hill where preservation guidelines restrict visible coatings, and hospitality properties on the Benjamin Franklin Parkway. The system installs on the exterior glass surface, requires no modification to the existing glazing, and is rated for 10-year durability with a 6-year warranty. Note that Bird Divert works best on glass with consistent direct sunlight exposure, and is most effective for species that can see UV light — owls and doves, which cannot, are not deterred by this system.
Retail & Storefronts Ground-floor and lower-level glass is where bird strikes are most concentrated. Birds traveling at shrub and ground level — particularly during dawn and dusk feeding activity — encounter retail storefronts, restaurant windows, lobby glass, and building base facades head-on. In Philadelphia's commercial corridors — Walnut Street, Chestnut Street, East Passyunk, and Old City — ground-floor plate glass without any bird-safe treatment is responsible for the large majority of the city's reported strike events during migration and year-round.
Bird Divert system applied to ground-floor retail glass is a transparent retrofit that installs on the exterior surface without any visible change to the storefront appearance. Customers looking in see normal glass. Birds approaching see the UV-reflective signal at the spacing that triggers avoidance behavior. For Philadelphia retailers concerned about window display visibility, Bird Divert is the only bird-safe solution that genuinely does not affect the appearance of the glass from street level.
Office Towers Philadelphia's Class A office towers represent the highest concentration of bird strike risk in the city — large, reflective glass facades that mirror sky and trees across multiple floors, sitting directly in the path of Atlantic Flyway migration. Bird Divert clear film installs on curtain wall glass at the same UV dot spacing that works on a rowhome window, scaled to cover tens of thousands of square feet of commercial glazing across multiple floors.
For Center City office tower property managers, the near-invisible result matters as much as the performance. Building management agreements, architectural specifications, and tenant lease terms often restrict visible coatings on exterior glass. Bird Divert clear film satisfies all of those constraints: it does not change the reflectance, transmittance, or visible appearance of the glass from outside the building. The UV signal that stops birds is simply not part of the human visual spectrum.
Residential Bird strikes are not only a commercial building problem. Philadelphia's rowhome stock — particularly homes near parks, gardens, tree-lined streets, and green corridors — creates residential strike hazards that homeowners may not recognize until they find a stunned or dead bird on their front step. Large bay windows that reflect sky, rear glass that creates a visual pass-through to a back garden, and windows near bird feeders are all common strike points in residential settings.
Bird Divert residential film applies to any standard residential window and installs quickly without disrupting the home. The UV Dot Marker solution is the most popular residential choice because it is virtually undetectable from the street — maintaining the appearance of the rowhome from the exterior while protecting birds that approach the glass. For homeowners in Chestnut Hill, Mt. Airy, Germantown, and other neighborhoods with significant tree cover and bird activity, residential Bird Divert is a straightforward and permanent solution.
Commercial Program The Commercial Program coordinates Bird Divert film installation across entire buildings — multi-floor office towers, full university campus glass programs, hospital facility complexes, and government buildings with large glass footprints throughout Center City and beyond. The program includes a glass survey and collision risk assessment, film selection and specification for each glazing type in the building, phased installation scheduling coordinated with building management, and complete documentation for Philadelphia bird-friendly building compliance and LEED credit submissions.
For Philadelphia property managers and facilities directors, the Commercial Program converts a complex multi-variable problem into a single managed engagement. Window Film Philadelphia handles measurement, access coordination, film selection, installation, and post-installation documentation. For buildings participating in Philadelphia's Lights Out program during migration season, Bird Divert film installed on lower floors — where the highest concentration of strikes occurs — delivers the most immediate impact on migration-season collision mortality.
A University City research facility had documented dozens of bird strikes per migration season on its south-facing curtain wall — a three-story stretch of floor-to-ceiling glass that reflected the tree canopy across the street.
The building's facilities team had been aware of the problem for years but was constrained by two competing requirements: the architectural specification required the glass to read as clear from the exterior, and the sustainability committee required a certified bird-safe solution. Bird Divert UV Dot Markers satisfied both. The near-invisible UV film maintained the appearance of the curtain wall from the exterior while delivering ABC-certified collision prevention across all three floors of at-risk glass.
Window Film Philadelphia completed the installation across three floors during a single two-day window using lift equipment coordinated with building facilities. Post-installation monitoring during the following fall migration season recorded a dramatic reduction in collisions on the treated glass compared with documented prior-season frequency. The installation documentation was incorporated into the building's LEED recertification submission.
Get a free bird-safe assessment for your building“We had a serious bird strike problem on our university's new science building — floor-to-ceiling glass on two elevations. The Bird Divert UV markers are completely invisible from inside but the collisions stopped almost immediately after installation. Worth every dollar.”
Facilities directors, property managers, and homeowners across Philadelphia and the surrounding region.
★★★★★
"We had a serious bird strike problem on our university's new science building — floor-to-ceiling glass on two elevations. The Bird Divert UV markers are completely invisible from inside but the collisions stopped almost immediately after installation. Worth every dollar."
Dr. Sarah M.
Facilities Director, University City Research Building
★★★★★
"Our Center City office tower had a bad reputation among birders during migration. After Window Film Philadelphia installed Bird Divert film on the lower floors, we went from multiple reported strikes per week during fall migration to essentially zero. The city's Lights Out program plus this film made a real difference."
James T.
Property Manager, Center City Office Tower
★★★★★
"We chose the fritted dot pattern for our new Rittenhouse office because it looked intentional — like the glass was designed that way. Guests always ask about it as an architectural detail. The fact that it also protects birds during migration is just right."
Patricia L.
Principal, Rittenhouse Architecture Firm
★★★★★
"I live in Chestnut Hill and was finding stunned birds on my front step several times a year. Window Film Philadelphia installed Bird Divert residential film on my bay windows in one morning and I haven't had a single strike since. Completely invisible from the street."
Margaret H.
Homeowner, Chestnut Hill
★★★★★
"We manage three buildings on the Schuylkill corridor and Bird Divert was the cleanest solution we found — no visual impact, immediate results, and the ABC certification documentation was exactly what our sustainability committee needed for the LEED submission."
David K.
Portfolio Manager, Schuylkill Corridor Office Buildings
★★★★★
"Our hospital campus had documented bird collisions near the main entrance atrium for years. The trellis pattern film that Window Film Philadelphia specified actually became a design feature our facilities team is proud of — and the collision monitoring shows it's working."
Lisa R.
Facilities Director, Philadelphia Hospital Campus
Honest answers about Bird Divert window film in Philadelphia from specialists with over 15 years of installation experience.
Talk to a SpecialistBird Divert is a UV-reflective window film system that prevents bird collisions with glass. The film uses UV-reflective markers visible to birds — who see into the ultraviolet spectrum — while remaining nearly invisible to human observers. Philadelphia is on the Atlantic Flyway, one of North America's four major migration corridors, making bird-safe glass a meaningful conservation measure for any building in the region.
Birds cannot perceive transparent glass the way humans do — they see a reflection of sky or habitat and fly directly into it. Bird Divert film applies UV-reflective markers to the glass surface at spacings that birds recognize as a physical barrier and avoid. The UV component is visible to birds but falls outside the range of human color perception, making the film effectively invisible from normal viewing distances.
Yes. Bird Divert products are tested and certified by the American Bird Conservancy (ABC) under their Bird-Friendly Building Design standard. ABC certification requires demonstrated collision reduction in controlled studies. Window Film Philadelphia installs only ABC-certified bird-safe film products that meet published bird-friendly design guidelines.
The near-clear UV Dot Marker solution is virtually undetectable from interior viewing distances and has minimal visual impact on the exterior appearance. Fritted and patterned film options are visible — and many architects choose them specifically because they add a design element to the glass. We will show you samples of all options before any installation.
Philadelphia has introduced bird-friendly building design requirements for certain new construction and major renovation projects. Bird Divert film installed by Window Film Philadelphia is an eligible compliance method. We can provide documentation of the product specification and installation for permit and LEED submission purposes.
Yes — Bird Divert film is a retrofit solution that installs on existing glass surfaces without any modification to the window or curtain wall system. Unlike fritted glass or acid-etched glazing, which require glass replacement, Bird Divert film makes any existing Philadelphia building bird-safe without disruption to the building envelope.
Genuinely invisible under normal viewing conditions. Bird Divert clear film does not change the tint, reflectance, or transmittance of the glass in the human visible spectrum. From inside the building, the glass looks exactly as it did before installation. From the exterior, there is no visible change to the appearance of the facade. The UV-reflective coating works in a wavelength range that birds can see and humans cannot — which is precisely what makes it effective without being visible.
Bird Divert uses a dot matrix of 0.25" absorbing dots and 0.375" absorbing/reflective dots at engineered spacing across the glass surface. The dots cover a small fraction of the total glass area, leaving the glass optically clear to human observers. Window Film Philadelphia will assess your glass type, sun exposure, and building context during the free consultation.
Yes. Bird Divert film is compatible with standard single-pane and double-pane insulated glass units when applied to the exterior surface. For buildings with specific glass specifications or Low-E coatings, Window Film Philadelphia will review compatibility before installation to ensure the film does not interact with existing glass treatments.
Philadelphia sits in the heart of the Atlantic Flyway migration corridor, and the city's glass-heavy commercial building stock contributes to significant annual bird mortality during spring and fall migration. "Building glass kills hundreds of millions of birds every year — it is one of the top direct human-caused sources of bird mortality," according to the American Bird Conservancy. Bird Divert reduces bird-glass collisions by up to 75% based on studies cited by the American Bird Conservancy — and works best on glass with consistent natural sunlight exposure.
