Abstract: The invention relates to a portable rooftop guardrail apparatus designed for efficient transportation and deployment on rooftops accessed through narrow hatches. The system comprises modular components, including vertical support members, lateral retaining rails, and adjustment rails, fabricated from hollow structural cross-sections. A reversible, self-closing gate assembly features a U-shaped extension and a receiver for adjustable closure. Each element is dimensioned for ease of passage through standard hatch dimensions, facilitating internal transport and rooftop assembly without the need for external lifting equipment. Optimized for rapid deployment and versatility, the apparatus complies with stringent safety standards and is engineered to withstand high wind loads. This configuration offers a scalable solution for enhancing worker safety in various rooftop environments, circumventing the need for permanent installations and reducing dependence on heavy machinery.