uPVC Windows & Doors

Why choose Crystal windows & doors?

• FREE national delivery - on all Crystal windows and doors 

• A-rated double or triple glazing – every Crystal window is supplied with A-rated glass to deliver excellent thermal performance and help reduce heating bills.

• Colour options – customers can select white or grey external finishes to complement their property’s façade.

• Included accessories – cills, handles and trickle vents come with each window or door, so there’s no need to buy extras.

• On-site glazing – Crystal windows are designed to be glazed on site, making it easier to manoeuvre frames without the weight of glass.

• 10-year warranty – Crystal offers a ten-year guarantee against manufacturing defects, providing peace of mind for homeowners.

Our Crystal range

Sterlingbuild offers a variety of window styles and a selection of glazed doors. Each product listing includes more size options for flexibility.

• uPVC Casement Windows - This range merges classic casement style with modern efficiency — offering side-hung and fixed configurations, A-rated glazing, multiple frame colours, and robust hardware to deliver functionality, style, and thermal performance in one package.
• uPVC Single Doors - This range features stylish, energy-efficient doors from Crystal Direct, including both full-glass and half-glass variants with options for double or triple glazing, white or grey frames, and premium hardware for long-lasting performance.
  uPVC French Doors – this range brings elegant, double-leaf door styling into your home with options for double or triple glazing, colour variations, and robust, low-maintenance construction for lasting performance

All Crystal products on Sterlingbuild are available with additional size options—select “More Options” on any product page to see the full list.

Crystal versus the competition

Unlike many budget windows on the market, Crystal’s frames are built to last. A-rated glazing ensures energy efficiency, and the optional triple-glazed upgrade offers extra insulation. Customers often choose Crystal over rival brands because accessories such as cills and handles are included, and the ten-year warranty underlines Crystal’s commitment to quality.

FAQs

What does “A-rated” mean?
An A-rated window has been independently tested and scored highly for energy efficiency; it will help to keep more heat in your home.

Are Crystal windows available in different colours?
Yes. Most Crystal windows and doors can be ordered with either a white or grey external finish.

What is included with each window or door?
Cills, handles and trickle vents are supplied as standard. Glazing beads are also provided, although glazing must be carried out on site.

Can I choose double or triple glazing?
Many Crystal windows offer a choice between A-rated double glazing or higher-performing triple glazing.

Do Crystal products come with a warranty?
Yes. All Crystal windows and doors on Sterlingbuild come with a 10-year manufacturer’s guarantee.

How do I select the right size?
Measure the structural opening and then choose the closest size. Each product page lists multiple size options; if you need advice, our customer service team can help.