Commercial Glass Facade Installation London | Subcontract Glaziers | Window Fitters Ltd

Window Fitters Ltd is a Croydon-based labour-only glass facade installation specialist providing CSCS-carded glazier crews for client-supplied stick facades, unitised curtain walling, and structural glass screens across London and Surrey. Backed by £5,000,000 Commercial Public Liability Insurance, £10,000,000 Employers' Liability Insurance, CDM 2015 RAMS, and 15+ years of commercial glazing experience.

Labour-Only Facade Installation for Main Contractors

Main contractors and commercial developers need reliable, skilled glazier labour to fit architect-specified facade systems. Window Fitters Ltd fills that role. You procure the facade materials from your chosen manufacturer (Reynaers, Schueco, Kawneer, Technal, or any other system). We provide the experienced, directly employed fitting crews to install them on site.

This model gives you full control over material procurement and specification. You manage your supply chain and budget. We deliver the installation labour with the safety compliance and trade skill your project requires.

Facade Systems We Install

Stick-Built Facade Systems

Stick facade systems are assembled on site from individual aluminium mullion and transom sections. Our glass facade installation crews bolt vertical mullions to floor slab brackets, fix horizontal transoms between them, and then glaze each panel into the framework.

Stick systems suit low-rise and mid-rise buildings, retail facades, and bespoke architectural elevations where each section may differ in sise. Our fitters work from manufacturer installation manuals and architectural facade drawings to achieve precise alignment across multi-storey elevations.

Installation process for stick facades:

• Laser-guided opening verification against architectural facade drawings
• Floor-slab bracket anchoring using chemical resin fixings or mechanical expansion bolts
• Vertical mullion positioning and plumb-line adjustment across multiple storeys
• Horizontal transom fixing and thermal break gasket installation
• Glass panel glazing using vacuum suction cup lifting equipment
• Perimeter EPDM weatherproofing and structural silicone bonding at joints

Unitised Curtain Walling Installation

Unitised curtain wall systems arrive on site as pre-fabricated, factory-assembled panels. Each panel is a complete module: frame, glass, gaskets, and fixings integrated into a single unit. Our facade installer crews lift each module into position using crane or vacuum suction equipment and lock it onto floor-slab anchor brackets.

Unitised systems offer faster installation than stick systems because most assembly happens in the factory. This reduces on-site labour time and weather exposure risk. We typically achieve installation rates of 15 to 25 panels per day depending on panel sise, floor access, and crane availability.

Store Frontage & Commercial Entrance Screens

We fit heavy-duty toughened glass shopfront screens, commercial aluminium entrance doorsets, and high-traffic retail glazing. Our commercial glazing company teams handle large-format laminated safety glass panels (up to 11.5mm thickness) using vacuum suction lifting equipment. All shopfront glazing is fitted with anti-burglar laminated glass and commercial-grade door hardware.

Structural Atrium Glazing & Overhead Glass Screens

For atrium roofs, overhead glass canopies, and walkway screens, our facade installation crews work with structural engineers to fit overhead glazing panels on steel or aluminium support frameworks. All overhead glazing uses laminated safety glass compliant with BS EN 14449 to prevent glass fall-out in the event of breakage.

Office Glass Partition Installation

We install frameless and framed glass partition systems for commercial office fit-outs. These include single-glazed and double-glazed acoustic partitions with Rw sound reduction ratings of 35 to 45 dB. Glass partitions create separate meeting rooms and private offices while keeping the floor plate open and well-lit.

Site Engineering Rigour

Glass facade installation demands precision engineering at every stage. A misaligned bracket or uneven sealant joint can cause water ingress, thermal bridging, or structural failure. Our site engineering standards include:

• Laser-Guided Opening Verification: We use rotating laser levels and digital spirit levels to verify that floor slab bracket positions match architectural drawings within a tolerance of ±2mm.
• Vacuum Suction Glass Lifting: Heavy double and triple-glazed facade panels (weighing up to 250kg per unit) are lifted using battery-powered vacuum suction cups rated for loads up to 500kg. This eliminates manual handling risks.
• Floor-Slab Bracket Anchoring: Facade support brackets are fixed to concrete floor slabs using chemical resin anchors (typically Hilti HIT-RE 500 V4 or equivalent) tested to the specified pull-out loads in the structural engineer’s calculations.
• Structural Silicone Bonding: At joints between panels and at perimeter interfaces, we apply structural silicone sealant (typically Dow Corning 795 or Sika SG-500) to create weather-tight and structurally bonded connections.
• Perimeter EPDM Weatherproofing: All frame-to-structure interfaces are sealed with EPDM gaskets and backing rods to prevent rainwater penetration and wind-driven moisture ingress.

Contractor Risk Mitigation

Main contractors face commercial and safety risks when engaging glazing sub-contractors. Window Fitters Ltd addresses every risk factor:

Risk Factor	Our Mitigation
Unqualified Labour	100% directly employed CSCS-carded glazier crews. Zero agency workers.
Site Safety Incidents	Site-specific CDM 2015 RAMS prepared before work begins. Full toolbox talks.
Insurance Gaps	£5,000,000 Commercial Public Liability Insurance and £10,000,000 Employers' Liability Insurance covering all commercial project sites.
Programme Delays	Dedicated site supervision by Marian Gheorghe (15+ years active commercial glazing experience). Daily progress reporting.
Defective Installation	10-year structural frame guarantee. Same crew returns for snagging.

Subcontract Pricing: Day-Rate & Fixed-Price Options

We offer two transparent pricing structures for commercial facade installation subcontracts:

• Day-Rate Pricing: Dedicated glazier gangs (2-man or 4-man teams) operating on competitive daily rates. Day-rate pricing suits projects with variable scope or phased delivery schedules where the final quantity of panels is not yet confirmed.
• Fixed-Price Per-Unit Subcontracts: Itemised pricing per square metre of fitted glazing or per panel installed. Fixed-price pricing suits projects with confirmed architectural drawings and final panel schedules.

Both pricing structures include CSCS labour, vacuum lifting equipment, structural sealants, EPDM gaskets, and full RAMS documentation. Material supply remains the responsibility of the main contractor or client.

Learn more about our commercial pricing on our labour-only glazier services page. For JCT subcontract terms, visit our B2B glazing contractor page.

Building Regulations & Compliance

Every glass facade installation we complete complies with current UK Building Regulations:

• Document L (Thermal): Facade panels meet the required curtain wall U-value targets. We verify thermal performance against the architect’s specifications and the approved building control submission.
• Document K (Safety Glass): All glass in critical zones below 800mm from floor level and within 1,500mm of doors uses toughened (BS EN 12150) or laminated (BS EN 14449) safety glass.
• Document B (Fire Safety): Fire-rated glass panels and cavity fire barriers are installed at compartment floor interfaces as specified by the fire engineer.

We coordinate with Local Authority Building Control (LABC) or approved private inspectors for site inspections and completion certification.

Frequently Asked Questions: Facade Installation

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