Door Fitters & Professional Door Installation Services
Window Fitters Ltd is a trusted provider of door installation services, employing experienced door fitters and door installers for residential properties, commercial developments, and housing projects across London, Surrey, and Croydon. From solid timber-core composite entrance doors to panoramic aluminium bifold systems and certified fire doorsets, we deliver precise, weatherproof, and secure door fitting.
Comprehensive Entrance, Bifold & Fire Door Fitting Across London & Surrey
Our experienced door fitters handle every stage of the installation process, including site measurement, frame positioning, mechanical fixing, perimeter sealing, and lock alignment.
High-Security Composite Entrance Doors & PAS 24 Locking
We supply and install high-density foam and solid timber-core composite entrance doors engineered for maximum security and thermal efficiency. Equipped with PAS 24 certified multi-point hook locking mechanisms, anti-snap euro-profile cylinders, and heavy-duty adjustable hinges, our entrance doors provide outstanding security against forced entry.
Slimline Aluminium Bifolding & Sliding Patio Door Systems
Our door installers fit thermally broken aluminium bifolding and sliding patio doors featuring ultra-slim sightlines. Designed with stainless steel roller tracks and multi-point locking bars, these door systems open smoothly while achieving low whole-door U-values.
Certified FD30 & FD60 Fire Door Assembly Installation
For commercial offices, communal spaces, and multi-occupancy residential developments, our qualified team installs certified FD30 and FD60 timber and composite fire doorsets. Every fire door fitting strictly follows BS 476 / EN 1634 standards, incorporating intumescent smoke seals, certified door closers, and fire-rated vision panels.
UK Building Regulations & Door Compliance (Document Q & B)
Every door installation completed by Window Fitters Ltd satisfies national standards under UK Building Regulations. We ensure security compliance under Document Q, fire containment under Document B, and energy conservation under Document L.
Low Threshold Integration & Part M Accessibility Standards
We specialise in subfloor levelling and slot-drainage integration to fit weatherproof low-threshold doors. Meeting Approved Document M accessibility rules, our threshold solutions provide flush transitions between indoor rooms and external patio decking while preventing water ingress.
Commercial Subcontracting & Direct Employment Guarantee
Main contractors and property developers choose Window Fitters Ltd for reliable site mobilisation. We guarantee 100% directly employed, CSCS-accredited door fitters with zero reliance on unvetted sub-contractors.
Itemised Quotations & Professional Site Installation
Whether you require supply and fit packages or labour-only door installation teams, we provide fixed, itemised project quotes with dedicated site supervision and full CDM 2015 safety documentation.
Frequently Asked Questions: Door Fitting & Installation
What types of doors do your door installers fit?
Our door fitters install composite entrance doors, uPVC patio doors, aluminium bifolding and sliding doors, French doors, traditional timber doors, and certified FD30/FD60 fire doorsets.
Are your door installations PAS 24 security certified?
Yes. All external entrance doors and ground-floor patio doors are fitted with multi-point locking systems and anti-drill cylinders meeting PAS 24 security standards and Document Q 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. He has spent over 15 years overseeing door fitting teams across London and Surrey, specialising in high-security composite doors, low-threshold aluminium bifolds, and commercial fire door compliance.
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 specialist double glazing installation company serving London and Surrey since 2016. 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
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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."