Commercial Glazing Company & Glaziers London | Window Fitters Ltd

Window Fitters Ltd is a Croydon-based glazing company providing experienced commercial glaziers for JCT subcontracts, curtain walling, shopfront glazing, and office fenestration across London and Surrey. Operating as both a supply-and-fit and installation-only company, all work is delivered by directly employed CSCS-carded teams with £5,000,000 public liability insurance.

Independent Commercial Glazing Company in Croydon

Window Fitters Ltd operates as an independent glazing company based at 139 Wentworth Road, Croydon, CR0 3HZ (Company Registration No. 10415531, VAT No. GB 258 7412 36). Since 2016, our glaziers have delivered commercial and residential glazing projects across Greater London and Surrey.

We are not tied to any single manufacturer or supplier. This independence means we source the best profile systems and glazing specifications for each project, whether that is a Reynaers curtain wall system for a commercial office or a Deceuninck uPVC package for a housing development.

Commercial Shopfront Glazing

Our glaziers install toughened glass shopfront screens, commercial aluminium entrance doorsets, and heavy-duty retail display windows. Commercial shopfront glazing requires different specifications from residential work.

Shopfront glazing specifications:

• Glass type: 10mm or 12mm toughened safety glass (BS EN 12150) for standard shopfronts. 11.5mm laminated safety glass (BS EN 14449) for high-security retail environments.
• Frame system: Thermally broken commercial aluminium profiles with 50mm to 65mm face widths. Polyester powder-coated to any RAL colour.
• Door hardware: Commercial-grade floor springs (Dorma BTS 80 or equivalent), panic exit bars (BS EN 1125), and heavy-duty patch fittings for frameless glass doors.
• Security: Anti-burglar laminated interlayers, commercial-grade multi-point locking, and mag-lock integration for access control systems.

Our glaziers handle complete shopfront fit-outs, from demolishing the old frontage to installing the new aluminium framework, glazing the panels, fitting entrance doors, and applying perimeter weatherproof seals.

Office Glazing & Acoustic Glass Partitions

For commercial office fit-outs, our glazing company installs single-glazed and double-glazed glass partition systems. Glass partitions divide open-plan office floors into meeting rooms, private offices, and breakout spaces without blocking natural daylight.

Acoustic performance ratings:

• Single-glazed partitions: Rw 35 to 38 dB sound reduction. Suitable for visual separation with moderate acoustic privacy.
• Double-glazed partitions: Rw 42 to 48 dB sound reduction. Suitable for boardrooms and private offices where speech confidentiality is required.

We also install back-painted glass wall panels and decorative glass splashback walls for commercial reception areas, hotel lobbies, and restaurant interiors.

Curtain Walling & Structural Glass Systems

As a specialist glazing company, we install aluminium curtain walling systems on commercial office buildings, mixed-use developments, and educational facilities. Our glaziers fit both stick-built and unitised curtain wall systems from all major manufacturers.

We also install structural glass systems including:

• Glass Juliet balustrades: BS EN 1991 compliant structural glass panels fixed with stainless steel clamp fittings or channel shoe systems.
• Frameless glass walls: Full-height structural glass panels bonded with structural silicone for minimal visual obstruction.
• Glass canopy and entrance screens: Overhead toughened laminated glass panels on stainless steel spider fittings or tension rod support.

For detailed facade fitting information, visit our glass facade installation page.

JCT Subcontract Governance

As a commercial glazing company, we operate under standard JCT (Joint Contracts Tribunal) subcontract agreements. JCT terms provide a clear, legally established framework covering:

• Interim valuations: Monthly measurement of completed work for staged payment applications.
• Retention: Standard 5% retention with 50% released at practical completion and the balance at the end of the defects liability period.
• Defects liability period: Typically 12 months. We return to remedy any snagging items at no additional cost during this period.
• Variations: Priced variations for additional scope requested by the main contractor or architect during the project.
• Insurance: £5,000,000 public liability insurance and employer’s liability cover as required by the JCT schedule.

Read more about our commercial contract terms on our glazing contracts page.

Council Housing Glazing Maintenance

Our glazing company provides window and door maintenance services for local authority housing stock, housing associations, and property management companies. Council housing glazing maintenance includes:

• Replacement of failed sealed glass units showing condensation or misting
• Hardware repairs and replacement (hinges, friction stays, handles, espagnolette locks)
• Fire door inspections and FD30 doorset replacements in communal corridors
• Emergency boarding and glass replacement after break-ins or storm damage
• Bulk window replacement programmes across multi-unit blocks

Installation-Only Company: Labour-Only Glazier Teams

Window Fitters Ltd operates as both a supply-and-fit glazing company and an installation-only company. If your development has already procured window frames, doorsets, or facade panels from a manufacturer, our labour-only glazier teams handle the fitting. This installation-only company model is popular with main contractors who manage their own material supply chains but need skilled, insured glazier labour on site.

On-Site Quality Auditing & Structural Glazing Calculations

Before our trade glaziers mobilise to any commercial site, our technical directors review architectural drawings, wind load calculations (BS EN 1991-1-4), and glass thickness stress limits. During installation, our lead glaziers complete quality audits verifying bracket anchor torque settings, glass setting block placement, structural silicone sealant depth, and perimeter EPDM compression.

Health, Safety & Site Environmental Protocols

Working on commercial building sites requires total commitment to environmental safety and waste reduction. Our glazing company enforces strict on-site environmental rules:

• Glass Recycling: 100% of waste glass removed during retrofits is segregated and returned to UK glass reprocessing plants.
• Aluminium & Steel Scrap: Legacy metal frames are fully recycled, reducing landfill impact.
• Hazardous Materials: Safe removal and disposal of legacy putty, mastic, and PCB sealants following HSE guidelines.

Tender Estimating & Commercial Project Sourcing

Our dedicated estimating team prepares competitive, itemised tender returns for main contractors bidding on public and private sector projects. We review bills of quantities (BoQ), architectural elevation drawings, and structural window schedules. Every commercial tender return includes a clear breakdown of material specifications, CSCS glazier labour rates, crane/hoist access requirements, site mobilisation schedules, and JCT subcontract terms.

Whether you require a full turnkey supply-and-fit commercial package or dedicated labour-only glazier gangs for client-procured materials, Window Fitters Ltd provides clear pricing and guaranteed site attendance across London and Surrey.

Quality Standards & Regulatory Compliance

Every commercial glazing project delivered by our glaziers complies with UK Building Regulations:

• Document L: Thermal insulation targets for commercial and residential glazing.
• Document K: Safety glass in critical zones (BS EN 12150 toughened / BS EN 14449 laminated).
• Document Q: PAS 24 security standards for external doors and ground-floor windows.
• Document B: Fire containment using FD30/FD60 fire doorsets in communal and commercial areas.

Our lead glaziers audit every installation against manufacturer specifications and UK Building Regulations before requesting Local Authority Building Control sign-off.

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

Frequently Asked Questions: Commercial Glazing Company

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