Your question touches on a fascinating intersection of urban design, safety regulations, and multifunctional furniture. The direct answer is: while not common, the concept of a garden bench officially certified as a fire escape does exist in specialized architectural and safety engineering circles.
Typically, a "fire escape" is a permanently affixed system—like a stairwell, ladder, or balcony—designed for emergency egress, governed by strict building codes (like the International Building Code or NFPA 101). A freestanding garden bench would rarely, if ever, meet these rigorous standards as a primary escape route. However, the innovative idea you're describing aligns with the principles of "dual-purpose" or "crisis-object" design.
In practice, you might find heavy-duty, permanently installed benches made from non-combustible materials like steel or concrete that are integrated into a building's exterior safety plan. For instance, a sturdy, bolted-down bench placed beneath a lower-floor window could, in an absolute pinch, provide a vital stepping stone to reach the ground or access a window meant for egress. Some forward-thinking architects and designers, particularly in space-constrained urban environments, have explored embedding functional ladder rungs within the structure of a robust bench, blurring the line between street furniture and emergency aid.
The key term is "certified." For a bench to be formally certified as a fire escape component, it would need to be part of a tested and approved assembly by a recognized testing laboratory (like UL or Intertek) for load-bearing, stability, and fire resistance. This is exceedingly rare for standalone outdoor furniture. A more realistic approach is specifying "safety-compliant" or "egress-assist" furniture during the building design phase, where benches are strategically placed to support emergency plans without claiming to be the escape itself.
So, while you likely won't find a certified "fire escape bench" at your local garden center, the principle is valid in high-design, safety-conscious architecture. It represents a clever approach to making public spaces both welcoming and resilient, ensuring that everyday objects can serve a critical function when seconds count. For homeowners, the takeaway is to consider sturdy, fixed seating near potential ground-floor egress points as a smart, informal safety enhancement, while relying on code-approved primary exits for true emergencies.