Square Edge Internal UPVC Window Sills

uPVC square window sills are a popular choice for both residential and commercial properties due to their durability, low maintenance, and versatility in styling. They are available in various colours and finishes, each bringing its aesthetic to the overall look of a building. The array of colours typically includes white, anthracite, black ash, rosewood, dark grey, slate grey, Irish oak, light oak, and plain black. Understanding the characteristics and applications of each colour can help make an informed decision that complements any space’s architecture and interior design.


White is the most classic and widely used colour for uPVC window sills. It offers a clean and bright appearance, making it a universal choice that matches any exterior or interior colour scheme. White reflects more sunlight than darker colours, which can help keep a home’s interior cooler in sunny climates.


Anthracite is a deep, rich grey that has gained popularity for its modern and sophisticated look. It pairs well with contemporary architectural styles and is often used in modern residential developments and commercial buildings to create a sleek, minimalist aesthetic.

Black Ash

Black ash has a textured finish that mimics the grain of natural wood while providing the benefits of uPVC. This colour is ideal for those who prefer a darker, more striking appearance against lighter facades. It’s particularly effective in enhancing the character of a property without the maintenance required by natural wood.


Rosewood uPVC sills offer the warm, rich tones of rosewood timber, making them a perfect choice for traditional and classical architecture. This finish is often selected to add a touch of elegance and an upscale look to exteriors and interiors without the cost and upkeep of natural wood.

Dark Grey

Dark grey provides a more subtle alternative to black, delivering a contemporary feel that is less stark than anthracite. It’s versatile and complements a wide range of building materials, including brick, stone, and render, making it suitable for diverse architectural styles.

Slate Grey

Slate grey features a muted, sophisticated hue that captures the essence of natural slate. This colour is particularly favoured in geographic areas with natural stone constructions, as it harmonises beautifully with such materials and landscapes.

Irish Oak

Irish oak is another wood-effect finish that offers the beauty of oak with the practical benefits of uPVC. Its natural golden hue is ideal for properties that aim to achieve a rustic or country-style appearance, providing warmth and a classic charm.

Light Oak

Light oak is lighter and more subtle than Irish oak, providing a soft, neutral wood effect that works well with various paint colours and architectural details. This colour is prevalent in areas where a bright, airy feel is desired internally and externally.

Plain Black

Plain black uPVC sills make a bold statement and are often used for their dramatic contrast and modern appeal. This colour is especially effective in contemporary designs or as an accent on more traditional properties, providing a striking visual boundary around windows.

Considerations and Applications

When choosing the colour of uPVC square window sills, consider the following:

  • Architectural Style: The colour should complement the overall style of the building. Traditional styles may benefit from wood-effect finishes like rosewood or Irish oak, while modern designs might favour anthracite, dark grey, or plain black.
  • Maintenance and Longevity: While all uPVC products are low maintenance, lighter colours may show dirt less prominently than darker colours, which can be a consideration depending on local environmental conditions.
  • Energy Efficiency: Lighter colours reflect sunlight, potentially influencing the property’s thermal efficiency.
  • Local Environment: Choose colours that harmonise with the natural surroundings and building materials prevalent in the area to enhance aesthetic integration.

uPVC square window sills in these diverse colour options allow property owners to improve their window designs while enjoying the benefits of a durable, low-maintenance material. The chosen colour can significantly affect the visual impact of the windows and the overall facade, emphasising the importance of selecting a colour that aligns with both practical needs and aesthetic desires.