Window Fitters for Commercial & Residential Glazing Across London & Surrey
Directly employed CSCS glazier teams for main contractors, developers, and private homeowners across London and Surrey. Book fixed-rate labour-only fitting for client-supplied units or complete trade supply and fit.
Got frames already on order or delivered to site? Hire our directly employed CSCS glazier teams at fixed trade day rates for casements, bifolds, sliding doors, and glazed screens.
Book Labour-Only →Trade-direct factory supply from trusted UK fabricators paired with precision fitting. Backed by a 10-year manufacturer frame warranty, 5-year unit seal cover, and our 12-month labour guarantee.
Explore Supply & Fit →Multi-unit window schedules, structural facades, and shopfronts under JCT or NEC subcontracts. Covered by £5M Public Liability, £10M Employers Liability, and site-specific RAMS.
View Commercial Contracts →Specialist Window & Door Installation Subcontractors
Window Fitters Ltd installs trade-supplied and client-procured windows and doors across London and Surrey to BS 8213-4 standards. Supported by £5M Public Liability and £10M Employers Liability, our directly employed CSCS glaziers carry out labour-only fitting at fixed day rates of £540 local and £580 extended.
Operating an independent glazing company from our Croydon base, you deal directly with working glaziers rather than sales reps. Whether you need experienced installers for housing developments, dedicated window fitters for multi-unit runs, or specialist door fitters for heavy aluminium sliders and bifolds, our teams arrive fully equipped with the right fixings, suction lifters, and site RAMS. Review our complete installation services or check trade labour rates in our installation cost guide.
Specialist Glazing Installation Services
Our directly employed CSCS glazier teams install domestic and commercial glazing systems across Greater London and Surrey. Choose a core service below for technical specifications, profile options, and labour rates:
Fitting uPVC, aluminium, and timber casements across residential extensions, new builds, and commercial blocks. Sized accurately, secured at 600mm fixing centres, and sealed to Part L standards.
View Window Installation →
Multi-leaf aluminium bifold systems fitted on level thresholds with proper toe-and-heel glass packing. Sashes run smooth on stainless tracks with clean perimeter weather seals.
Explore Bifold Doors →
Solid timber core and high-density composite entrance doors hung plumb and square. Fitted with PAS 24 multi-point locks, 3D adjustable hinges, and low Part M access thresholds.
View Composite Doors →
Heavy inline and lift-and-slide patio doors fitted on structural sub-cills. We handle wide glass panels up to 300kg using specialist suction lifting gear on site.
Explore Sliding Doors →
Ground-floor curtain walling, structural glass screens, and commercial shopfront entries installed under JCT or NEC subcontracts with site-specific RAMS and lift plans.
View Commercial Glazing →
Vertical sliding sash windows with spiral balances or traditional weights and cords. Retains authentic sightlines on period properties while delivering modern Part L draught and thermal performance.
Explore Sash Windows →
Double-opening master and slave French doors hung with adjustable flag hinges and top/bottom shootbolts. Glazed with toughened Part K safety glass and fitted to rebated or low thresholds.
View French Doors →
Heavy-duty flush aluminium entrance systems with concealed pivots, multipoint auto-locks, and thermal breaks achieving sub-1.0 W/m²K Ud values.
View Entrance Doors →Why Contractors & Homeowners Hire Us Direct
We work on the tools every day across London and Surrey. You deal directly with Marian Gheorghe and experienced site glaziers, cutting out retail showroom markups and sales commission layers:
No unvetted agency fitters. Every operative on your job is a direct, CSCS-carded glazier working under site-specific CDM 2015 RAMS and lift plans.
Every job complies with UK Building Regulations. We coordinate directly with Local Authority Building Control (LABC) or approved inspectors for Part L thermal, Part F airflow, and Part Q security sign-off.
Clear, fixed trade rates of £540 local and £580 extended for a 2-man installation team. Predictable labour costs for builders and trade clients with zero hidden extras.
Protected by £5M Public Liability, £10M Employers Liability, Environment Agency carrier licence CBDL650268, 10-year manufacturer profile warranties, and our 12-month labour guarantee.
How We Price and Run Your Project
From first drawings to final site sign-off, here is how we keep pricing transparent and jobs running on programme:
Send us your aperture dimensions, architectural window schedules, or clear photos via our quote form or WhatsApp. If you need an on-site survey, we arrange technical measuring visits (£50 local, £80 extended, refunded against the final labour invoice).
We turn around a clear, line-by-line quote breaking down trade day rates, per-unit fitting costs, or complete supply-and-fit packages with no hidden extras.
Our CSCS glazier teams arrive on time with the right fixings and plant. We fit and seal every unit to BS 8213-4 standards, clear all waste under licence CBDL650268, and complete a formal QA handover.
Recent Subcontractor Projects and Case Studies
Explore recent commercial and architectural glazing subcontracts delivered across Croydon, Greater London, and Surrey:
24-Unit Apartment Glazing Package (Croydon)
Full supply-and-fit contract installing 68 acoustic uPVC casements and 24 PAS 24 composite entrance doors on a new residential development.
Spec: Document L 1.2 W/m²K | LABC Completion CertificateStructural Glass & Bifold Installation (Surrey)
Labour-only glazier subcontract fitting floor-to-ceiling Reynaers aluminium bifolds and 180kg static glass screens using hired spider crane suction plant.
Spec: Reynaers Aluminium | Hired Plant & Lift PlanCommercial Shopfront & Facade (Central London)
Subcontract fitting architectural aluminium entrance screens, toughened safety glass, and commercial closers for a ground-floor office refurbishment.
Spec: Commercial Aluminium Facades | PAS 24 Security HardwareRegional Coverage Across London & Surrey
Dispatched daily from 139 Wentworth Road in Croydon, our glazing teams cover domestic and commercial contracts across Greater London and Surrey. For wider capital work, see our London window fitters guide. Our local teams handle window and door fitting daily across Bromley, Sutton, Mitcham, and Purley. Further west, our South West London door installation teams serve projects in Wandsworth, Wimbledon, Kingston, Richmond, and across Surrey. Find our complete dispatch zones and travel tiers on our location page.
Preparing a commercial tender, bill of quantities, or residential replacement? Review our case studies for completed project specs, see our fitting process, or contact our Croydon office for an itemised trade quote.
Frequently Asked Questions for Commercial Clients & Main Contractors
Direct, factual answers to technical, commercial, and regulatory questions regarding trade glazier subcontracting, day rates, and Building Regulations compliance across London and Surrey.
Do you offer labour-only subcontract fitting for client-procured windows and doors? +
Yes. Window Fitters Ltd provides dedicated labour-only glazier subcontracts for main contractors, builders, and developers who buy frames directly from fabricators. Our directly employed, CSCS-carded glazier teams handle site offloading, mechanical fixing to BS 8213-4, and weather-sealing across London and Surrey.
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, beating UK Building Regulations Document L replacement requirements (1.4 W/m²K) and meeting new build standards. For Passivhaus and ultra-low energy projects, our triple-glazed 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 specialise in B2B JCT and NEC glazing subcontracts. We operate with £5,000,000 Commercial Public Liability Insurance, £10,000,000 Employers Liability Insurance, full CDM 2015 site RAMS, direct LABC sign-off capability, and complete compliance with UK Building Regulations Documents L, F, K, Q, M, O, and B.
What is your payment policy for supply-and-fit orders compared to installation labour? +
For supply-and-fit contracts, custom-fabricated frame orders require 100% upfront settlement upon CAD approval and technical survey sign-off, passing factory trade savings directly to the client. Installation labour is invoiced separately in agreed commercial milestones or upon practical completion following QA inspection.
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 our technical UK Building Regulations Guide and our building control inspections guide.
Is sticking aluminium foil on window glass a safe shortcut for thermal insulation? +
No. Taping aluminium foil or solar film onto window glass creates an impermeable moisture trap. Condensation pools inside frame rebates, creating ideal conditions for mould growth, which is a recognised allergen that can trigger respiratory symptoms. Additionally, solar heat absorption can degrade glass units and frame seals. Rather than temporary foil hacks, the safe and effective solution is upgrading to modern Low-E double glazing units. Read our trade guide on aluminium foil window shortcuts and health risks.
What areas do you cover for commercial subcontracting? +
From our Croydon headquarters, we support commercial developments across Greater London, Surrey, and surrounding areas via Croydon HQ travel-time tiers (<15m local at £540/day, 15-45m extended at £580/day, >45m outer Surrey with half-day minimum), including Bromley, Sutton, Mitcham, Purley, and central London.
Author & Technical Reviewer: Marian Gheorghe
Director & Senior Estimator, Window Fitters Ltd
Marian Gheorghe is Director and Senior Estimator at Window Fitters Ltd. With over 15 years on the tools across commercial and residential glazing, he personally prices tenders, runs technical site surveys, and oversees installation quality and UK Building Regulations compliance across London and Surrey.
Ready to discuss your project?
Window Fitters Ltd provides window and door installations across London and Surrey for residential, trade, and commercial projects.
Message our team on WhatsApp or send an enquiry with your drawings, photos, or measurements to receive a free, no-obligation quote.
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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."