Commercial Glazing Contractors & B2B Subcontracting
Window Fitters Ltd is an experienced commercial glazing contractor and subcontract fenestration specialist based in Croydon. We provide fully accredited, directly employed CSCS-carded glazier teams for main contractors, housing developers, local authorities, facilities managers, and architectural fabricators across Greater London and Surrey (within our 40-mile operational radius). Whether executing complete commercial glazing packages or supplying specialist labour-only installation gangs, we deliver uncompromised site safety, strict program adherence, and full JCT subcontract governance.
Commercial Subcontracting Scope & Sectors
We operate seamlessly under standard JCT (Design & Build, Minor Works, Intermediate) and bespoke trade subcontracts, providing robust site supervision and directly employed trade labour across diverse commercial sectors:
- Commercial Office Fenestration: High-performance thermally broken aluminium window and door systems designed for low acoustic transmission and solar heat gain control.
- Curtain Walling & Structural Glazing: Installation of client-supplied stick-built and unitised aluminium curtain walling systems, glass atriums, and planar glass canopies. Explore our dedicated curtain wall installation and glass facade services.
- Commercial Shopfronts & Entrances: Heavy-duty ground-floor retail shopfronts, toughened safety glass, automatic sliding doors, and PAS 24 security entrance doorsets.
- Multi-Plot Residential Developments: Scalable window and door fitting teams for new build housing sites, social housing block refurbishments, and student accommodation blocks.
- FD30 & FD60 Fire Door Assemblies: Certified timber and steel fire door installations with intumescent smoke seals for commercial corridors, stairwells, and plant rooms. View our certified fire door fitting.
- Labour-Only Glazier Subcontracting: Direct hire of vetted CSCS glazier gangs on day rates or fixed-price schedules for main contractors with client-supplied frames and glass. Learn more on our labour-only glazier hub.
Commercial Health, Safety & Site Compliance
- CDM 2015 RAMS Governance: Full site-specific Risk Assessments and Method Statements prepared and submitted to the principal contractor prior to site mobilization.
- 100% CSCS-Carded Workforce: Every glazier holds a valid CSCS card (Blue Skilled Worker / Gold Supervisor), with designated operatives holding PASMA (mobile access towers) and IPAF (powered access) licenses. We operate a strict direct-labour policy with zero unvetted agency workers.
- Comprehensive Insurance Coverage: Backed by £5,000,000 Commercial Public Liability Insurance and £10,000,000 Employers' Liability Insurance across all active construction sites.
- Logistics & ULEZ Compliance: Our commercial fleet is fully ULEZ compliant and experienced with London red-route loading restrictions, timed delivery windows, and city-centre logistics management.
Commercial Tendering, Procurement & Day-Rate Structure
We work collaboratively with commercial estimating teams, quantity surveyors, and contracts managers to provide transparent procurement options:
| Subcontract Package | Commercial Scope | Procurement Structure |
|---|---|---|
| Fixed-Price Turnkey Glazing | Full supply, delivery, technical survey, installation, and Building Control sign-off. | Lump-sum tender based on BOQ and architectural drawings. |
| Labour-Only Glazier Gangs | CSCS glazier teams installing client-supplied curtain walling, windows, and doors. | Fixed day rates (from £250/day per operative) or agreed metre-rate price work. |
| Commercial Maintenance & Repair | Emergency glass replacement, misted units, hardware overhaul, and safety audits. | Scheduled framework agreement or reactive call-out rate. |
Our estimating department provides rapid tender turnarounds. Send your architectural drawings (PDF / DWG), bills of quantities, and subcontract requirements for review within 48 to 72 hours.
Discuss your upcoming commercial tender directly with our project team. Contact Window Fitters Ltd on 020 3411 0589, view our standard contract framework, or submit your tender pack via our contact page.
Author & Technical Reviewer: Marian Gheorghe
Head Installer & CEO, Window Fitters Ltd
Marian Gheorghe is the Active Director and Team Leader Installer at Window Fitters Ltd. With over 15 years of hands-on experience, he oversees technical safety and UK Building Regulations compliance for all residential and commercial glazing contracts.
Book a free site survey. No obligation, no pressure.
Window Fitters Ltd installs windows, doors, fire doors, and commercial glass facades across London and Surrey. Croydon head office, 40-mile service radius, 100% directly employed CSCS-carded fitters.
Our estimators respond within 24 business hours with a fixed-price quotation.
Verified Google & MyBuilder Reviews
"Stunning Sash Windows in Croydon"
"Marian and his team replaced our old Victorian sash windows. They were clean, fast, and the double glazing has completely blocked out the street noise. Highly recommended!"
"Excellent Bifold Doors in Bromley"
"Installed beautiful grey aluminium bifold doors for our new kitchen extension. Smooth gliding mechanism and great insulation. The best quote we got in Kent."
"Perfect Front Door Upgrade in Sutton"
"Very happy with our new composite door installation. Excellent lock security and high-quality GRP slab finish. Fast half-day fitting and no mess left behind."