123 Victoria Street

Substantial glazing replacement for one of central London’s most iconic modern buildings

Located in a prominent position on London’s Victoria Street, 123 is a 231,800 sq ft complex across eleven floors which includes 28,000 sq ft retail area and 199,000 sq ft of prime grade A office space with high profile occupiers including Royal Bank of Scotland, Santander, Boots and Pret–a-Manger.


Owners Land Securities obtained planning permission during 2010 for a comprehensive refurbishment. The redevelopment, designed by Aukett Fitzroy Robinson included replacing all glazing and shop fronts to improve energy efficiency and maximise the internal natural lighting. A new roof was added, and the canopy removed, allowing the original award winning architecture to come back to life. Internally the building was completely stripped out, the service core and reception areas reconfigured and all plant and machinery replaced.

Originally built in the 1970s, the fenestration of 123 Victoria Street is a striking architectural feature, with all elevations dominated by distinctive eight pane glazed bays. As part of the £42 million refurbishment programme, planning restrictions required the retention of existing aluminium frames but the important landmark complex also needed to deliver an improved thermal and acoustic performance.

The retrofit programme by Glassolutions provides an excellent model of delivering sustainability whilst respecting the aesthetics of the original building design and materials.  Working with one of the UK’s leading fit-out companies, Como Group, and contractor Mace Construction, Glassolutions was brought in at an early stage in the design process.

This enabled the team to create a complete mock-up of an existing glazed eight panel bay, but fitted with new high performance double glazed sealed units housed within bespoke insulated frame extrusions in a structure which also featured specially designed gaskets to achieve water tightness.  The design totally replicated the original style of the units but delivers improved thermal and acoustic insulation.

Products used

There are 17 retail units on the ground floor, which were all fully refurbished. The glass system used for the units is full height structural glazing with bespoke stainless steel patch fittings, and internal glass fins with frameless glass doors. All glass used in the units is 15mm toughened DIAMANT (extra clear glass with low iron content) which provides a 91% light transmission as required by the client.

Between each unit there are white EMALIT glass panels (an opaque coloured glass, produced by uniformly enamelling one side of the glass) to cover the existing columns, which are fixed using an aluminium carrier frame system developed by Glassolutions. The columns form an architectural feature on the Victoria Street side of the building.

The retail units on the rear side of the building consist of the same type of glazing system with blue grey anodised louvre frames at the head to provide a link to the mechanical engineering system.

The replacement glazing for the upper floors was mainly a solar controlled specification to meet visual and performance requirements of the building. Solar control coatings decrease the total energy transmission and reduce excessive heat build-up and the need for wasteful and expensive air conditioning, which can also use a considerable amount of energy. They also reduce glare, which results in a more comfortable environment.

COOL-LITE SKN 165 was assembled into the double glazed units to provide enhanced safety and security plus thermal and acoustic comfort.


Important in the achievement of a good BREEAM rating, Glassolutions was able to offer full ISO14001 supply chain tracking. Over 180 tonnes of existing glass from the site was recycled at Glassolutions’ associate company Saint-Gobain’s UK glass float manufacturing facility.



A stylish interior product, created to give the effect of a vintage antique mirror.

Self Cleaning Glass - BIOCLEAN

Low-maintenance self-cleaning glass


CLIP-IN is a revolutionary, patented hinge which is fixed to the glass in such a way as to be practically ‘invisible’

EI Fire Resistant Glass - Contraflam

CONTRAFLAM EI, clear, fire-resistant safety glass, offering 30-120 minutes of protection

E/EW Fire resistant glass - Contraflam Lite

CONTRAFLAM LITE E/EW, clear, fire-resistant safety glass, offering 30-120 minutes of protection

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