Why Replace Your Windows?
Modern windows deliver comfort, security, and savings that older windows simply can't match.
A-Rated Efficiency
Reduce heat loss and lower energy bills
Enhanced Security
Multi-point locks and toughened glass
Noise Reduction
Acoustic glazing for peaceful homes
Maximum Light
Slim frames for more glass area
Replacement Windows
20 window installations across London & Kent
Window Styles for Every Home
From traditional casement windows to elegant bays and contemporary tilt & turn systems, we offer styles to suit every property type and personal preference.
Free Window Survey
We'll assess your existing windows, discuss your requirements, and provide a comprehensive quote with no pressure.
- Accurate measurements
- Style & colour advice
- No hard selling
Quality Window Replacement Across London & Kent
Whether you're updating tired windows, improving energy efficiency, or enhancing your home's security, NZR Windows & Doors delivers expert window installation across London, Kent, Surrey, and Essex. See our full range of residential installations.
Our FENSA-certified installers work with premium uPVC, aluminium, and timber window systems from leading manufacturers. Every installation includes multi-point locking, toughened safety glass, and energy-efficient sealed units. For window repairs, see our residential repair services.
Materials to Match Your Home
uPVC Windows offer exceptional value, excellent insulation, and virtually no maintenance. Available in white, cream, grey, black, and woodgrain finishes.
Aluminium Windows feature ultra-slim frames for a contemporary look with maximum glass area. Powder-coated finishes in any RAL colour.
Timber Windows provide authentic character for period properties with modern performance through engineered timber and advanced glazing. Contact us for a free quote.
Book a Home Installation Quote
Tell us about your project and we'll arrange a free, no-obligation home survey.
Window FAQs
What's the difference between uPVC and aluminium windows?
uPVC windows are cost-effective and excellent for thermal efficiency. Aluminium windows offer slimmer frames, more colour options, and a contemporary aesthetic. Both are low maintenance and long-lasting.
How long do replacement windows take to install?
A typical house can be fully re-windowed in 1-2 days depending on the number of windows. Each window usually takes 1-2 hours to remove, fit, and finish.
Will new windows reduce my energy bills?
Yes, modern A-rated windows significantly reduce heat loss. Many customers see noticeable reductions in heating costs, especially when replacing old single-glazed or worn double-glazed units.
Can you match windows to period properties?
Absolutely. We offer timber-effect finishes, Georgian bars, decorative glass, and sash-style windows designed to complement Victorian, Edwardian, and heritage properties.
Are your windows FENSA registered?
Yes, all our window installations are FENSA certified, ensuring full compliance with building regulations. You'll receive a certificate for your records and any future property sale.