A skybridge is an enclosed or open pedestrian walkway that connects two buildings at an elevated level, allowing people to cross between structures without going down to street level. They range from simple covered corridors linking office towers to massive architectural landmarks spanning hundreds of feet in the air. You’ll find them in hospitals, hotels, corporate campuses, and city centers around the world.
How Skybridges Work
At their simplest, skybridges are elevated corridors suspended between two anchor points on separate buildings. But the engineering is more complex than it looks. The two buildings a skybridge connects are never perfectly still. Wind pushes them, temperature changes cause materials to expand and contract, and in earthquake-prone regions, the ground itself shifts. Each building moves independently, which means the bridge has to accommodate two structures swaying in different directions at the same time.
Engineers solve this with expansion joints and sliding connections that allow the bridge to flex and shift without cracking or pulling away from either building. One end of the skybridge is typically fixed to its host building, while the other end sits on a sliding bearing that lets it move freely. This prevents the bridge from becoming a rigid link that would transfer dangerous forces between structures. Some designs also use dampers, similar in concept to a car’s shock absorbers, to reduce the vibration and movement people feel while crossing.
Materials and Construction
Steel is the dominant structural material for skybridges. It offers the best strength-to-weight ratio for spanning long distances without intermediate supports, and it can be fabricated into precise shapes offsite, then lifted into place. Concrete is sometimes used for heavier, shorter spans or for the floor decks within a steel frame. Glass plays an increasingly important role in cladding, letting natural light in and giving occupants views of the city below.
Glass itself is brittle and typically doesn’t serve in load-bearing roles, relying instead on steel or concrete framing for structural support. Researchers at the University of Pennsylvania have pushed this boundary by designing a 30-foot bridge made entirely of hollow glass units. Each piece fits with the next within a 0.1-millimeter margin of error. As the lead researcher explained, individual glass units are quite brittle on their own, but when assembled precisely, they rely on each other and the whole structure gains strength. That approach remains experimental, but it hints at where skybridge design could head as materials science advances.
Why Cities Regulate Them
Skybridges don’t just float between private buildings. They almost always cross over public streets, sidewalks, or other city-owned land, which makes them a zoning and permitting challenge. Seattle’s permitting process is a good example of how seriously cities take this. Applicants must submit a necessity statement explaining why no feasible alternative exists on private property. The city will only issue skybridge permits in very limited circumstances, and even then, the permits are entirely temporary, vest no permanent rights, and can be revoked. If a permit is terminated, the owner must restore the public right-of-way to its original condition.
This tension between private convenience and public space is central to skybridge debates in urban planning. Critics argue that skybridges pull foot traffic off sidewalks, hollowing out street-level retail and public life. Supporters counter that they improve accessibility, protect pedestrians from extreme weather, and make large building complexes more functional. Cities like Minneapolis, which has an extensive downtown skyway system covering roughly 11 miles, have leaned into the concept. Others, like Seattle, treat each new proposal with skepticism.
Access is another point of contention. Some skybridges are fully public, acting like elevated sidewalks. Others are private, restricted to employees of the connected buildings or guests of a hotel. Many fall somewhere in between: technically open to the public during business hours but locked at night. The rules depend on the terms of the permit and the city’s zoning code.
Notable Skybridges Around the World
Petronas Twin Towers, Kuala Lumpur
The most recognized skybridge in the world connects the Petronas Twin Towers at floors 41 and 42. It spans 58.4 meters and sits 170 meters above street level. The 325-ton center section was hoisted into place at a careful speed of 12 meters per hour to ensure it wouldn’t be dropped. The bridge isn’t rigidly attached to both towers. It rests on spherical bearings that let each tower sway independently in the wind without stressing the connection, a textbook example of the sliding-joint approach used in skybridge engineering.
Marina Bay Sands, Singapore
Marina Bay Sands takes the concept to an extreme. Three hotel towers are linked at the 57th floor by a 2.5-acre SkyPark, a rooftop platform holding swimming pools, restaurants, gardens, and a public observation deck. The 151-meter-long infinity pool is the world’s longest, and the observation deck extends 66.5 meters beyond the edge of the building, making it the longest occupiable cantilevered structure in the world. Calling it a “skybridge” undersells it. It’s closer to a park that happens to be 200 meters in the air.
Kingdom Centre, Riyadh
The Kingdom Centre’s Sky Bridge sits at the top of the building rather than between two towers. It’s a 65-meter-long steel structure weighing approximately 300 tons, positioned 300 meters above the ground inside the building’s distinctive parabolic arch. It functions as an enclosed observation deck, offering panoramic views of Riyadh from the city’s highest public vantage point.
Practical Uses Beyond Architecture
Most skybridges aren’t architectural landmarks. They’re functional connectors designed to solve everyday problems. Hospitals use them to link patient towers to parking garages and outpatient clinics, keeping patients and staff out of weather and traffic. University campuses use them to connect buildings across busy roads. Convention centers and hotels link to adjacent retail or transit hubs so guests can move seamlessly between venues.
In cold-weather cities, skybridges become part of larger indoor pedestrian networks. Minneapolis, Calgary, and Hong Kong all have extensive elevated or underground walkway systems where skybridges serve as critical links. For workers in these cities, it’s possible to commute from a parking garage to an office, grab lunch, and return without ever stepping outside. That convenience is the whole point, even if it comes at the cost of the street-level vibrancy that urban planners worry about losing.
In emergency planning, skybridges offer an additional evacuation route between buildings, giving occupants more options if a stairwell is blocked. Fire codes typically require that skybridges meet the same fire-resistance ratings as the buildings they connect, with posted evacuation maps and clear signage at both ends. Some are pressurized to prevent smoke from entering during a fire, functioning as protected corridors between separate fire compartments.