Professional Window & Door Glazing Services: London & Surrey
At Window Fitters Ltd, we deliver high-performance glazing installations, specialist subcontracting, and reliable maintenance for residential and commercial properties. From our base in Croydon, our skilled fitting teams serve London, Surrey, and surrounding areas (within a 40-mile radius). We combine premium British-sourced materials with exceptional workmanship to ensure your glazing meets the highest standards of energy efficiency, weather resistance, and building security.
We believe in providing complete operational flexibility for all projects. Homeowners, developers, and commercial main contractors can choose between our two core service pathways:
- Supply and Fit Contracts: A comprehensive, end-to-end service where our team manages the technical site survey, sources premium A-rated frames and safety glass at exclusive trade rates, manages delivery, and executes the professional installation. Find out more on our contracts page.
- Installation Only Services: Professional glazier labour for projects where you have already purchased your own windows, doors, or glass panels. Our skilled installers handle the unloading, precise fitting, and weather sealing on site. Check our installation services for full operational details.
Every window fitting and door replacement we perform conforms strictly to current UK Building Regulations, including Document L for thermal efficiency. Our standard double-glazed systems typically achieve whole-window U-values (Uw) around 1.24 W/m²K-comfortably beating the UK replacement threshold of 1.4 W/m²K and meeting new build targets (1.2 W/m²K). For Passivhaus and ultra-energy-efficient projects, we source premium triple-glazed, timber, and alu-clad systems (including high-performance brands like Norrsken / morsken) that achieve whole-window U-values from 0.64 to 0.94 W/m²K. We can source any window system on the market, focusing on uncompromised quality and durability. Although we do not provide FENSA self-certification, we coordinate directly with local authority building control departments to schedule inspections, submit specifications, and secure legal building control sign-off for your property records. For details on compliance, view our legal documents and guarantee pages.
Our Core Glazing Services
We provide a comprehensive range of glazing services, from minor home repairs to large-scale commercial installs. Explore our primary service divisions:
Window Fitting & Replacement
Expert installation of energy-efficient, A-rated window systems sourced from leading UK manufacturers including Deceuninck, Liniar, Rehau, and Profile 22. We fit traditional vertical sliding sash windows, modern uPVC casements, uPVC windows, tilt-and-turn styles, and architectural aluminium windows. Upgrade to double glazing or high-performance triple glazing to reduce heat loss.
Exterior Door Fitting
Premium entrance and patio door installations designed for maximum security. Our team fits durable composite doors, classic French doors, and slimline aluminium bifold doors. Every door is fitted with advanced multi-point locking systems. Read more about our specialist door fitters.
Glazing Repairs & Maintenance
Extending the lifespan of your existing glazing through targeted repairs. We resolve misty double glazing (failed units), draughty sashes, rotten sills, and replace broken locks, handles, hinges, and install cat flaps. Browse our maintenance guides.
B2B Commercial Subcontracting & Public Tenders
Window Fitters Ltd is a trusted glazing subcontractor for commercial developers, housing associations, and main contractors. We bid for public and private tenders, providing structured pricing, comprehensive material sourcing, and scale of supply for new build estates, office blocks, and education facilities across South London, W2 Queensway, and Surrey.
Our commercial teams work within standard construction contract frameworks (including JCT contracts) and operate under strict site management rules. We draft and provide comprehensive Risk Assessments and Method Statements (RAMS) in advance and maintain close communication with site managers to meet strict building control deadlines. Learn more on our dedicated B2B contracting, compliance-led fire door installation, glass wall panel fitting, and standard commercial glazing pages.
Our Directly Employed Glazing Labour Force
The foundation of our reputation is our dedicated glazing labour force. We believe that professional standards can only be guaranteed by directly employing our workers. Every fitter on our team is fully trained, holds a valid CSCS card, and operates under strict safe working procedures aligned with CDM 2015 regulations.
By avoiding the use of temporary subcontractors, we maintain absolute consistency in quality, cleanliness, and safety. Every team member is fully committed to our customer-first standards, keeping your property clean and tidy throughout the fitting process. Read more about our qualifications on our window fitter team and explore career openings on our careers page.
Why Choose Window Fitters Ltd?
- Decade of Expertise: Local fitters with over 10 years of experience who handle every detail without outsourcing.
- Direct Accountability: Zero reliance on third-party subcontractors. Our directly employed installers manage your project from start to finish.
- Regulations and Compliance: Aligned with Documents L, K, and F. We coordinate directly with local building control to ensure every replacement is legally certified.
- Safety & Risk Management: Full RAMS documentation provided for all commercial subcontracts under CDM 2015. Detail-oriented safety is our priority; read our safety measures.
- PAS 24 & Secured By Design: All our window and door installations meet PAS 24 security standards. Combined with toughened safety glass, multi-point locking, and Document Q compliance, your property is fully protected.
- Comprehensive Protection: Supported by a comprehensive £5,000,000 public liability insurance policy covering all residential and commercial contracts.
- Trade Sourcing: Direct relations with leading UK fabricators allow us to pass significant trade discounts directly to our clients.
Areas We Cover & Local Expertise
Operating from our primary base in Croydon, our mobile glazing units provide prompt coverage across South London, Surrey, and surrounding boroughs. We frequently complete double glazing installations in Bromley, Sutton, Mitcham, and the wider Surrey commuter belt. Whether you require a swift door repair or a complete glazing upgrade, our local teams provide reliable, expert service. View our full coverage details on our location page.
Ready to discuss your glazing requirements? Check out our case studies to see our previous work, read our helpful how-to guides, try our interactive Window & Door Survey Designer to prepare your measurements online, or get in touch with our Croydon office today for a free, transparent quotation.
Frequently Asked Questions
Do you provide glazier labour if we have already purchased our own windows or doors?
Yes. Window Fitters Ltd provides specialised "Installation Only" glazier labour for client-procured and pre-purchased architectural glazing systems across London and Surrey. Our experienced trade glazier teams ensure precision fitting without risking damage to high-spec materials. Visit our installation services page for full details.
What U-values do your window and door installations achieve under UK Building Regulations?
Our standard double glazing delivers whole-window Uw values between 1.20 and 1.24 W/m²K - comfortably beating the UK Building Regulations Document L replacement maximum (1.4 W/m²K) and meeting new-build targets. For Passivhaus and ultra-low energy projects, our triple-glazed 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?
Absolutely. We specialise in B2B JCT-governed glazing subcontracts. We operate with £5M Public Liability Insurance, full CDM 2015 RAMS, direct LABC sign-off capability, and full regulatory compliance across UK Building Regulations Documents L, F, K, Q, and B (FD30/FD60 fire doors). Learn more on our B2B contracting page.
Are client choices limited to specific window brands or materials?
No. We maintain market-wide sourcing flexibility. We can source and fit any window or door system on the market - including uPVC, aluminium, structural timber, alu-clad, and composite systems - focusing strictly on structural durability, high thermal performance, and architectural intent.
Do you offer emergency window repairs, boardups, or locksmith services in Croydon and Surrey?
Yes, we offer emergency window boardups (ranging from £50 to £500 depending on scope), professional glass repair for misted or broken units, commercial locksmith services starting from £100, and fire door repairs across Croydon, Surrey, and Greater London. See our emergency services page for details.
Do you install composite doors and fire doors?
Yes. We are experienced door fitters and door installers specialising in composite entrance doors, FD30 and FD60 fire doors, bifold doors, French doors, patio doors, and internal doors. Every door installation meets PAS 24 security standards and includes multi-point locking systems. Browse our door installation and fire door installer pages.
Do you handle building control inspections and certification?
Yes. Although we do not hold FENSA registration, we coordinate directly with local authority building control departments. We organise the necessary site inspections, submit technical specifications, and secure legal building control sign-off for your property records - ensuring your installation is fully certified and compliant. Read more on our building control inspections page.
What areas do you cover for window and door installations?
We operate from our base in Croydon and cover London, Surrey, and surrounding areas within a 40-mile radius. Our teams frequently complete installations in Bromley, Sutton, Mitcham, Purley, and the wider Surrey commuter belt. View our full coverage on the location page.
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."