- Product Overview
- Features & Benefits
- Energy
- Quality Assurance
- Colour Finishes
- Security
- Guarantee
- FAQs
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Decorative Lead Windows
Choose John Williams decorative lead windows and create an elegant, warmer and more secure home.
Quality craftsmanship, high standards of service, and exceptional value for money through competitive prices have been the hallmarks of John Williams for more than 40 years.
From initial survey through to design and manufacture, installation and aftercare, we'll improve your home with durable yet beautiful double-glazed Lead Windows, delivering quality every step of the way.
Decorative Lead Windows - Features & Benefits
Choose double-glazed decorative windows from John Williams and you will enjoy all these home improvement benefits:
- Make your home warmer: John Williams windows use advanced glass technology designed to minimise draughts and heat loss, making your home warm and cosy
- Enjoy peace of mind with improved security: All John Williams decorative lead windows incorporate corrosion resistant multi-point locking mechanisms and the glazing is fitted from the inside, so your home is more safe and secure
- Relax in peace and quiet: Make your home a peaceful sanctuary with John Williams decorative windows, designed to significantly reduce the impact of outdoor noise
- Add long-lasting value to your property
- Enhance the look of your home with beautifully designed double-glazed decorative windows
- Benefit from decorative lead windows unique to you - tailor-made in size, shape, function and character to your exact requirements
- Reduce heating bills thanks to our energy-efficient windows
- Spend less time and money cleaning and repairing - our decorative windows won't rot, flake, rust or fade
- Enjoy peace of mind with our 10-year guarantee
Decorative Lead Windows - Energy
Improve the energy efficiency of your home, reduce your carbon footprint and save money on heating bills with double glazed decorative lead windows from John Williams.
All our casement window products are “A”-rated as standard - the highest energy efficiency rating available. By fitting John Williams decorative lead windows you will reduce heat-loss and minimise draughts, and so you'll be less reliant on your heating.
If your heating is on less or at lower temperatures, you're cutting down on the amount of fossil fuels needed to heat your home, reducing the carbon dioxide that goes into the atmosphere and so minimising your carbon footprint.
Latest glazing technology such as soft coat low emissivity glass offers even more energy-saving benefits by reflecting heat back into the room. For a warm, cosy home and reduced heating bills choose John Williams double glazed decorative lead windows.
Decorative Lead Windows - The qualifications for the job
From the products we manufacture to the installation and customer services we provide, quality remains the hallmark of John Williams.
We remain one of the few companies to hold the British Standards Institution award for manufacture and customer care.
For even greater assurance, we hold no fewer than four Kitemarks - nationally recognised seals of approval - for the quality of our products and their excellent energy ratings.
And as a member of FENSA, you are safe in the knowledge that our replacement windows and doors comply with the current Building Regulations for both England and Wales.
With our products made, supplied and fitted using in-house resources, we operate stringent quality control and testing at every stage.
In this way, John Williams can maintain such high standards, and reward our customers with the very best service.
Decorative Lead Windows - Colour Finishes
Beautiful colour tones to suit your home…
Create a home as individual as you are with coloured UPVC decorative lead windows from John Williams.
Discerning homeowners understand the great benefits and advantages that professionally designed, custom-made, and installed coloured UPVC decorative lead windows products can offer!
Timber alternatives, so prone to rotting and splitting, can cost as much as three times more than a superior quality John Williams UPVC alternative replacement - so it's never been a better time to invest in colour!
As well as brilliant white, UPVC windows from John Williams come in a range of tasteful colours, making it easier than ever to improve your home with that extra special touch.
Together with our authentic grained finishes, our fabulous range of colours will fully complement and truly enhance any home.

Create a home of true distinction with beautifully coloured decorative lead windows from John Williams
Decorative Lead Windows - Security
We want you to feel safe and secure in your own home. With decorative lead windows from John Williams you can enjoy complete peace of mind about the security of your loved ones and your property.
Our UPVC casement double-glazed windows meet all British Standards requirements for security. Our multi-point locking system is endorsed by the police with a Secured by Design award.
We also fit stainless steel multi-point locking mechanisms and lockable window handles, and can install laminated glass for further security if you so wish. In addition, glazing is fitted from the inside of our decorative windows to prevent intruders from prising their way in.
All John Williams products are designed and manufactured by us, and rigorously tested to ensure they can withstand attempted break-ins. In this way we are confident that your decorative lead windows are safe and secure.
Decorative Lead Windows - Guarantee
THE JOHN WILLIAMS 10-YEAR GUARANTEE
Invest in any products from John Williams, and you are investing in peace of mind for years to come.
That’s because we have been successfully designing, manufacturing and installing windows, doors, conservatories and roofline products for hundreds of thousands of customers for more than 40 years.
Because of the confidence we have in the superior quality of our materials, and our craftsmanship, we guarantee all our products for 10 years.
John Williams' products are designed to last, and our excellent customer service means we go on looking after you long after installation.
We are fully compliant with relevant industry bodies including the Fenestration Self-Assessment Scheme (better known as FENSA).
And with our Price Promise, all this peace of mind is offered at prices giving you exceptional value for money.
Decorative Lead Windows - FAQs























