What impact does extending a parking garage below grade have?

Extending a parking garage below grade primarily affects the ability to provide adequate openings. When a parking structure is built underground, it restricts access points and natural light due to the earth surrounding it. This can limit the number and size of openings, such as windows or ventilation systems, which are critical for both circulation and safety. Adequate openings are essential for vehicle access (such as ramps and entrances) and for compliance with fire and safety regulations.

Natural light, which is more common in above-grade structures, is significantly reduced in below-grade parking due to the lack of windows, which can also impact the user experience. Therefore, when planning a below-grade parking garage, architects and engineers must carefully consider how to accomplish structural integrity while ensuring that the openings needed for access, ventilation, and safety can be adequately provided, which is the key impact of extending the garage below grade.