Interactive Glazing Configurator & Energy Savings Calculator
Planning a commercial refurbishment, residential window replacement, or bifold door installation? Use our interactive tools below to estimate annual energy bill savings, or launch our full online Window & Door Survey Designer to map openings, configure profile splits, and prepare technical tender documents.
All Window Fitters Ltd installations conform strictly to UK Building Regulations, including Document L (thermal efficiency), Document K (glazing impact safety), and Document F (trickle ventilation).
1. Property & Window Inputs
2. Projected Performance Impact
Need a professional onsite technical survey by our team?
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."