The addition of extra storeys to existing buildings, commonly known as airspace or top box development, has evolved from a niche architectural concept into a rapidly expanding sector within modern construction. As urban land availability continues to decrease, airspace development offers a smart, sustainable way to unlock new residential and commercial space within existing city footprints.

At its core, the principle is simple. However, the engineering, structural integration and delivery required to achieve it successfully are highly complex.

Frameclad’s light steel framing systems are ideally suited to this form of construction, enabling seamless integration with existing external walls, loadbearing structures, floor systems and roof configurations. This makes our light steel frame systems particularly effective for delivering lightweight, high-performance top box developments with precision and efficiency.