developers and architects were seeking. Importantly, lightweight systems helped
address thermal performance concerns because they required fewer penetrations into the slab ie fewer anchors/arms etc to carry the balcony load. Compared to traditional concrete balcony construction, this results in a much smaller connection interface to the slab, rather than a continuous thermal bridge. Balconies also became a valuable marketing tool. Developers recognised they could enhance apartment desirability, offering private outdoor space and providing the potential to increase rental prices, as well as making the development more viable. Grenfell and the fire safety revolution The Grenfell Tower fire in 2017 marked a pivotal moment for balcony design and specification. Following investigations and regulatory
reviews, balconies became part of the wider discussion around external wall fire safety. Particular attention was given to combustible materials and the potential for fire spread between dwellings. The Building (Amendment) Regulations 2018 classified balconies as “specified attachments” to buildings, bringing them within enhanced fire safety requirements. For residential buildings above 18m, the use of combustible materials became significantly restricted. This represented the most significant
regulatory change affecting balcony design in decades. Fire performance moved from being one consideration among many to becoming a fundamental requirement. The industry responded by accelerating the adoption of non-combustible materials and systems capable of meeting both safety and aesthetic objectives. Sustainability shapes specification Alongside fire safety, sustainability has become a major influence on balcony design over the last five to seven years. Developers are increasingly assessing
materials based not only on cost and performance but also on whole-life carbon impact and ESG commitments. Aluminium has emerged as a particularly attractive option. Aluminium balconies are significantly lighter than traditional steel alternatives, often around half the weight, reducing structural loads and potentially lowering the number of connections required. The material is also infinitely recyclable without loss of quality, supporting circular economy principles,
so at end of balcony life the aluminium can be recycled. Its durability also contributes to strong sustainability credentials. Aluminium balcony systems typically provide service lives of 60 years or more, require minimal maintenance and offer excellent corrosion resistance. As a non-combustible material, aluminium also aligns with modern fire safety requirements. As whole-life performance becomes an increasingly important procurement consideration, these benefits are expected to drive continued growth in aluminium balcony specification. The latest development: Remote-locking technology While material innovation has transformed balcony design, installation technology has continued to advance as well. One of the most significant recent
developments is Sapphire’s Remote Locking Device (RLD) balcony systems. Designed to improve both safety and efficiency, these systems change the way balconies are connected to buildings. Installing balconies involves working at height, which carries inherent risks. The RLD enables the balcony to be securely connected prior to installers accessing the structure to complete the remaining fixings, significantly reducing exposure to height-related hazards and enhancing overall site safety. The technology also simplifies installation sequences and helps minimise disruption to other construction activities.
A good example is the Alperton Bus
Garage regeneration project, where three residential buildings utilise a unitised façade system incorporating brick-slip and aluminium cladding. Sapphire’s challenge was to coordinate the balcony installation
with the façade programme while maintaining access for mast climbers. To address this, cast-in brackets were embedded within the reinforced concrete frame before façade installation. The RLD system allowed balcony arms to remain housed within the balcony cassette until installation. This avoided interference with façade works while enabling efficient balcony installation at the appropriate stage of construction. Looking ahead The evolution of the UK balcony over the last 20 years reflects broader changes across the construction industry. Improvements in thermal performance, off-site manufacturing, fire safety and sustainability have all influenced how balconies are designed and delivered. What began as a move away from traditional concrete construction has developed into a sophisticated sector focused on safety, efficiency, environmental performance and resident wellbeing. As the industry continues its drive
towards net zero, balconies will increasingly be judged not just on appearance or cost, but on their whole-life impact. Lightweight, low-maintenance systems that minimise embodied carbon, support circular economy principles and improve construction efficiency are likely to play a growing role in future developments. The balcony has evolved from a simple external platform into a carefully engineered component of the building envelope, and its future will be shaped by the same factors driving the wider industry: safer construction, smarter installation and more sustainable solutions.
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