Product Overview

Although a lot more elegant, Glide-On Cassette balconies are like a forklift lifting a pallet, it’s that simple.

What are Cantilever/Projecting balconies?

Projecting balconies, often known as ‘cantilever balconies’, are essentially platforms added to a building which cantilever off of the main building structure and allow residents to step out onto a platform protected by a perimeter balustrade. Traditionally the choice were; Steel framed bolt-on balconies, or concrete balconies. Sapphire’s Rapidly installed, Rigid Glide-On Cassette balconies have fast saturated the market place as the balcony of choice.

What are Glide-On Cassette balconies?

Because of their simplistic yet innovative approach, Cassette balconies are rapidly replacing traditional steel bolt-on balconies. (read about bolt-on balcony disadvantages)

The first part is the bracketry which can be chosen from a range of cast-in or post-fixed brackets to enable the connection to the main building structure or floor slab, each with steel arms protruding from the façade. The balcony Cassette® (the frame structure and balustrade) is a deck made with oversized holes to receive the steel arms when the Cassette® is craned into position. Each Cassette® is delivered preassembled and factory finished to a high quality standard with minimal on site finishing.

Advantages of Glide-On balconies:

Offsite manufactured

Offsite manufacturing avoids the hassle of coordinating multiple trades and site storage of materials as balconies are stored offsite preassembled and delivered when required.

Premium quality

Factory controlled stage by stage quality processes ensure a premium offering.


Aluminium Cassette® balcony decks are approximately half the weight of steel which can reduce the number of brackets required to connect back to the main structure. This reduces the number of façade penetrations reducing the risk of cold bridging, damp etc. which bring both additional costs and hassle.

Discreet fixings

Sapphire Cassette® balconies have been carefully engineered to avoid visible welds and keep fixings discreet. All Cassettes® come with soffits which complete the underside, unlike the photo shown.

Stronger, more rigid

Sapphire have developed specialist cast-in anchors which can achieve three times the strength of common market alternatives meaning less deflection and increased rigidity giving the best resident experience and product confidence.

Always fit

Sapphire provide templates with cast-in anchors. These avoid RC frame casting issues, so that balconies fit first time, avoiding the traditional bolt-on balconies misalignment issues, which cause coordination issues and variations.

More tolerance

+/- 20mm adjustment horizontally and vertically gives far more tolerance than traditional steel bolt-on balconies which need to align holes perfectly. It’s also key for achieving perfect aligning and levelling.

Reduced H&S risks

Glide-On™ balcony technology removes the need for men to connect the balcony underneath, (like traditional installs, as shown in this photo), whilst the crane holds its weight.

Prefitted soffits saves time

Unlike traditional balconies, Glide-On™ Cassettes® are fixed to anchors from above so soffits can be factory installed reducing the finishing works and overall costs.

Top down installation

With the use of Sapphire’s innovative counter-balance lifting equipment, a balcony can be installed beneath another. This allows top down installation, close behind scaffold strike, thus reducing programme and prelim costs.