The integration of glazing into precast concrete, commonly referred to as preglazing has moved from an emerging concept to a proven and increasingly essential strategy in contemporary building construction.
What began with cast-in-thin brick and embedded insulation has now evolved into the complete prefabrication of building envelopes – factory-assembled façade units that can incorporate insulation, electrical systems, as well as high-performance glazing.
We specialise in the integration of glazing systems into precast concrete panels. With the continued growth of modular construction and increasing project complexity, preglazing has become a strategic solution in both new-builds and refurbishments across the UK.
We work closely with a trusted network of precast partners to ensure seamless integration and outstanding results. Our collaborations with industry leaders such as Techcrete, Thorps and Grants allow us to align glazing and precast design from the earliest stages, ensuring precision, buildability and efficiency throughout the process. These strong partnerships enable us to deliver fully coordinated, high-performance façade solutions that meet the demands of complex programmes and ambitious architectural intent.
Our Approach
We don’t believe in one-size-fits-all solutions. Every project brings a unique set of challenges – from design intent and sequencing to site constraints and performance targets. That’s why our approach to glazing into precast is highly collaborative and project specific.
Early Engagement
We begin by partnering with architects, precast manufacturers and façade engineers. This ensures glazing strategies are fully embedded into the panel design, structural tolerances are accounted for and interfaces are clearly defined.
Factory-Side Coordination
We work directly with the precast facility to coordinate installation at the casting yard. This includes sequencing, logistics planning, sealing protocols and QA procedures. The result: units that arrive at site fully glazed, tested and ready to install.
On-site Support
While most of the work happens off-site, we provide comprehensive on-site support during installation, to ensure seamless integration from design through delivery. In most cases, we also carry out additional on-site works such as rooftop pavilions, ground floor wraps, glass entrances and terrace glazing packages – making our presence a key part of the construction phase.
Design Flexibility
Contrary to early assumptions, glazing into precast does not limit design creativity. In fact, it can enhance it – allowing for highly expressive façades with precision-built, thermally efficient window systems.
Façade Geometry
From flush-mounted ribbon windows to deeply recessed openings or curtain wall options to facilitate larger glass configurations, systems adapt a variety of architectural styles. They are available with multiple sightline options and frame finishes to suit each project’s vision.
Glazing Options
Precast systems can accommodate a wide range of glass specifications – from solar-control and low-E coatings to laminated acoustic units and spandrel panels. Whether your design demands transparency, privacy or shading, we’ll integrate the right build-up.
Hybrid Systems
In projects where a mix of precast and curtain wall is required, we can offer hybrid façade solutions – coordinating detailing across both systems to deliver visual continuity and technical compatibility.
Benefits of Glazing into Precast
Faster Programme Delivery
Preglazed panels significantly accelerate construction timelines by removing the need for on-site glazing crews, scaffolding, and weather-dependent scheduling. Early enclosure enables quicker internal fit-outs and reduces prelim costs – keeping projects on track and on budget.
Improved Safety Standards
With glazing, sealing, and QA taking place in a factory-controlled environment, the need for working at height or in exposed site conditions is dramatically reduced. This controlled process enhances safety and ensures consistency.
Superior Quality Control
Factory glazing allows for precise detailing – delivering consistent joint spacing, better sealant performance, and reduced risk of on-site damage. Water and air testing are streamlined, ensuring high-performance outcomes that meet and exceed specification.
Cost Efficiency
Preglazed façades simplify sequencing and reduce reliance on multiple trades on-site. Particularly beneficial for high-repetition schemes like student housing and residential blocks, this method offers real value engineering potential without compromising performance or design.
Sustainable Construction
Glazing into precast supports sustainability goals by reducing waste, improving material efficiency, and aligning with BREEAM, WELL, and Net Zero targets. Enhanced U-values, airtightness, and solar control contribute to long-term operational energy savings.
Conclusion
Glazing into precast combines precision engineering with construction efficiency – transforming façades into high-performance, architecturally expressive systems delivered with speed and consistency. It enables design teams to achieve complex aesthetic goals while improving safety, quality, and sustainability throughout the project lifecycle.
At OAG, our preglazed façade solutions are expertly developed, coordinated and delivered through close collaboration with leading precast partners. Each solution is fully integrated and rigorously managed, from early concept to final installation:
- Early-stage design coordination with architects, engineers, and precast manufacturers to define glazing strategy, structural tolerances, and interface detailing
- System specification including thermal performance, acoustic glazing, solar control, fire rating, coatings, and framing design
- Precast panel integration – ensuring glazing is structurally and aesthetically integrated into the panel design with optimal fixings, sealing, and drainage
- Factory-side planning with panel sequencing, quality control, and off-site dry-fix or bonded glazing
- Controlled fabrication in a factory environment using CNC machining, seal testing, and strict QA protocols
- On-site support during panel installation, providing alignment checks, anchoring guidance, and post-installation sealing
- Lifecycle value with robust systems designed for minimal maintenance and long-term durability.
At OAG, we’ve successfully delivered preglazed façade solutions across office and commercial developments, major refurbishments, infrastructure projects, and iconic architectural landmarks. Our portfolio includes standout schemes such as Begbroke Science Park, 1 Victoria Street, and 30 Duke Street – each one demonstrating how intelligent integration and technical precision can elevate both building performance and architectural design.
As the construction industry increasingly embraces off-site methodologies, glazing into precast offers a smarter, safer, and more sustainable way forward. Partner with OAG for façade solutions that are engineered to perform, designed to inspire, and delivered with confidence.
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