Window and Door Fitting Company & Commercial Installation Team
Window and door installers for commercial contractors, developers, and homeowners across London and Surrey. Supply and fit or labour-only glazing services.
Commercial Glazing Subcontracting & Architectural Fenestration
Window Fitters Ltd operates as a dedicated B2B glazing subcontractor and specialist installer for property developers, principal main contractors, architectural practices, and housing associations across South London, Surrey, and Greater London. Based in Croydon, our directly employed fitting force delivers multi-unit residential developments, commercial office fit-outs, and structural glass installations within strict project schedules and budget parameters.
To support main contractor procurement and estimating requirements, we offer two primary commercial contract structures:
- Supply and Fit Packages: Comprehensive turnkey contracting covering technical site surveys, direct sourcing of A-rated frames and safety glazing at trade rates, site delivery logistics, crane/lifting ops, and final installation sign-off. Learn more on our contracts page.
- Specialist Labor-Only Glazier Subcontracts: Experienced glazier teams available for main contractors who have already procured high-spec architectural glass, aluminium curtain walling, or specialist window systems (including Reynaers, Schueco, Velfac, and Norrsken). Our teams handle safe offloading, mechanical positioning, fixing, and EPDM weather-sealing on site. Review details on our installation services page.
Every fenestration package we install satisfies UK Building Regulations. Our standard double-glazed systems comfortably achieve whole-window U-values (Uw) between 1.2 and 1.4 W/m²K, easily exceeding the UK replacement threshold of 1.4 W/m²K and satisfying new build standards. For Passivhaus and ultra-low energy specifications, we supply and fit triple-glazed timber and alu-clad systems reaching whole-window U-values down to 0.64 W/m²K. We work directly with Local Authority Building Control (LABC) to arrange site inspections, submit technical drawings, and secure legal completion certificates. View full compliance details on our legal documents and guarantee pages.
Core Service Pathways for Commercial & Architectural Projects
We structure our operational teams into three targeted B2B divisions to serve the fenestration needs of commercial clients:
Commercial Contractors & Developers
Structured JCT subcontracts, structural curtain wall systems, certified FD30/FD60 fire door assemblies, and multi-unit window packages for new builds and commercial refurbishments. Target keywords: Commercial Glazing Contractor London, JCT Glazing Subcontractor Surrey.
Explore B2B Contracting →Main Contractors (Materials Procured)
Specialist labor-only glazier hiring for pre-purchased architectural glass, aluminium frames, shopfront screens, and high-performance fenestration systems. Target keywords: Subcontract Glazier Labor Only, Commercial Window Fitters Croydon.
View Glazier Labor Options →Architectural Residential Builds
High-end slimline bifold doors, structural glass wall panels, floor-to-ceiling sliding glass, composite entrance systems, and custom aluminium or uPVC profiles. Target keywords: Architectural Window Installers, Structural Glass Fitting London.
Explore Architectural Glass →Commercial Subcontracting Capabilities
Window Fitters Ltd bids on public and private commercial tenders across South London and Surrey. Our project management team prepares itemized tender returns based on architectural specifications, window schedules, and bills of quantities (BoQ).
Our fitters operate under standard JCT subcontract terms and strict site governance rules. We issue detailed Risk Assessments and Method Statements (RAMS) in advance of site mobilization, maintain dedicated site supervisors, and ensure seamless progress alongside main contractor schedules. Explore our dedicated B2B contracting, fire door compliance, and curtain wall installation pages.
Directly Employed CSCS Glazing Operatives
Our workforce model relies entirely on directly employed, experienced glazing operatives. We do not use unvetted temporary sub-laborers. Every fitter on site holds a valid CSCS card, undergoes regular health and safety training, and operates strictly in compliance with CDM 2015 regulations.
This direct employment structure guarantees quality control, site cleanliness, and strict adherence to technical installation manuals. Read more on our window fitting team page and review current opportunities on our careers portal.
Why Partner with Window Fitters Ltd?
- Over a Decade of Glazing Experience: Specialist trade knowledge in multi-unit fenestration and commercial glass installations.
- 100% Directly Employed Workforce: Full accountability with zero reliance on unvetted third-party sub-contractors.
- Building Regulations Rigor: Direct alignment with Document L, Document F, Document K, and Document Q, supported by LABC certification.
- Comprehensive RAMS & CDM 2015 Safety: Site-specific risk assessments and method statements provided prior to site mobilization. Read our safety measures.
- PAS 24 & Fire Security Standards: High-security multi-point locking, toughened safety glass, and certified FD30/FD60 fire door fitting.
- £5,000,000 Commercial Insurance: Comprehensive Public Liability Insurance protecting all commercial and multi-unit projects.
- Direct Trade Sourcing: Sourcing agreements with UK fabricators (Deceuninck, Liniar, Rehau, Profile 22, Schueco) passing trade cost savings to our clients.
Recent Subcontractor Projects & Case Studies
Explore recent commercial and architectural glazing contracts completed across Croydon, London, and Surrey:
24-Unit Apartment Glazing Package - Croydon
Supply and fit subcontract featuring high-performance acoustic uPVC windows and PAS 24 composite doorsets for a new residential development.
Spec: Document L 1.2 W/m²K | LABC Sign-OffStructural Glass & Curtain Wall - Surrey
Labor-only glazier subcontract for a high-end architectural residence featuring floor-to-ceiling glass panels and aluminium bifold systems.
Spec: Reynaers Aluminium | Structural GlazingCommercial Fire Door Assembly - London
Installation of certified FD60 fire door assemblies and fire-rated vision panels across an office redevelopment in central London.
Spec: FD60 Certified | BS 476 Compliance
About the Author: Marian Gheorghe
Head Window Fitter & Active Director, Window Fitters Ltd
Marian Gheorghe is the Head Window Fitter and Active Director of Window Fitters Ltd. With over 15 years of hands-on experience in the glazing and fenestration industry across London, Marian leads the direct-employment labour force and oversees technical safety compliance for all residential and commercial JCT contracts.
Regional Coverage & Service Areas
Operating from our base in Croydon, our mobile glazing units support commercial projects across South London, Surrey, and Greater London. We complete multi-unit installations and architectural builds in Bromley, Sutton, Mitcham, Purley, and surrounding areas. Review our full regional coverage on our location page.
Preparing a commercial tender or architectural specification? Review our case studies for technical references, explore our fitting process, or contact our Croydon commercial team for an itemized quotation.
Frequently Asked Questions for Commercial Clients & Main Contractors
Do you offer labor-only subcontract glazier fitting for pre-procured architectural glass systems? +
Yes. Window Fitters Ltd provides specialist labor-only glazier subcontracts for main contractors and developers who have procured windows, doors, or curtain walling directly from manufacturers. Our directly employed, CSCS-accredited teams handle safe unloading, positioning, mechanical fixing, and EPDM weather-sealing across London and Surrey. Visit our installation services page for operational details.
What U-values do your commercial window and door assemblies achieve under UK Building Regulations? +
Our standard double-glazed window packages deliver whole-window Uw values between 1.2 and 1.4 W/m²K, easily surpassing UK Building Regulations Document L replacement requirements (1.4 W/m²K) and meeting new build standards. For Passivhaus and ultra-low energy developments, our triple-glazed timber and alu-clad systems achieve whole-window Uw values ranging from 0.64 to 0.94 W/m²K.
Are you equipped to handle commercial JCT subcontracts and site safety compliance? +
Yes. We specialize in B2B JCT-governed glazing subcontracts. We operate with £5M Public Liability Insurance, full CDM 2015 site RAMS, direct LABC sign-off capability, and complete compliance with UK Building Regulations Documents L, F, K, Q, and B (FD30/FD60 fire doors). Learn more on our B2B contracting page.
Can you supply and install certified FD30 and FD60 fire doorsets for commercial redevelopments? +
Yes. We supply and fit certified FD30 and FD60 timber and composite fire door assemblies for multi-unit residential developments and commercial offices. Every installation complies with BS 476 / EN 1634 fire safety standards and PAS 24 security criteria. Explore details on our fire door installer page.
Are client choices limited to specific window brands or profile systems? +
No. We maintain market-wide sourcing flexibility. We source and fit systems from leading fabricators including Deceuninck, Liniar, Rehau, Profile 22, Schueco, Reynaers, and Velfac, focusing on structural durability, thermal rating, and architectural specification.
How do you handle Building Control certification and compliance sign-off? +
We coordinate directly with Local Authority Building Control (LABC) or approved inspection bodies. We manage the submission of technical drawings and glazing specifications, schedule site inspections, and secure official completion certificates for project records. Read more on our building control inspections page.
What areas do you cover for commercial subcontracting? +
From our Croydon headquarters, we support commercial developments across Greater London, Surrey, and surrounding areas within a 40-mile radius, including Bromley, Sutton, Mitcham, Purley, and central London. View our location page for full coverage details.
Contact us today to schedule a free survey.
We will work with you to choose the right door and window for your needs and budget, and then we will professionally install it.
Window Fitters Ltd is a double glazing company. We've been doing this for over 10 years in the UK, and we're good at it. With our services, you can rest assured that you're getting the best value for your money.
We would be happy to discuss your needs and provide you with free advice.
Our team will answer any questions you may have or help you choose the right installation service for your home or business.
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."