How did CR Smith enhance the light, warmth and kerb appeal of a Glasgow tenement flat?

At a glance:

• Location: Glasgow
• Homeowner: Ms Stanford
• Product: Lorimer Sliding Sash windows 
• U-value: 1.4W/m2k
• Security: PAS 24 multi-point locking system
• Challenge: Draughty, single-glazed, dated centre pivot windows which had poor thermal efficiency and rotting timber
• Solution: Low-maintenance uPVC sliding sash windows to complement the heritage and architecture of the building
• Result:
  • Improved thermal performance and reduced draughts
  • Reduced maintenance compared to timber
  • Enhanced kerb appeal while respecting traditional architecture

What challenges did the original windows present?

Ms Stanford’s tenement flat had single-glazed centre-pivot timber windows which dated back to the 19th century. While traditional in appearance, they had become increasingly impractical. The windows were draughty and offered poor thermal performance and required frequent upkeep. Over time, the timber frames had begun to show signs of rot, adding further maintenance demands beyond what is typically expected of timber windows. From the inside, the overall look of the windows also felt dated, while the single glazing reduced the comfort and energy efficiency of the home.

Why were Lorimer sliding sash windows the right solution?

Working closely with her local CR Smith product expert, Ms Stanford opted for the Lorimer sliding sash windows to complement the character of the traditional Glasgow tenement, while delivering the benefits of modern performance.

Designed to replicate the look of classic sash and case windows, the new units feature authentic sash horns and traditional ironmongery, ensuring the architectural integrity of the building is maintained. This beautiful design enhances kerb appeal, provides greater thermal performance and ease of use without compromising on traditional heritage.

How has the upgrade improved warmth and energy efficiency?

Replacing the single-glazed timber windows with modern double-glazed Lorimer sliding sash windows has significantly improved the flat’s thermal performance.

Heat retention has increased, draughts have been reduced, and the home now feels noticeably warmer and more comfortable, all thanks to the clever engineering and precision fitting of Lorimer windows. The improved insulation helps create a consistent internal temperature throughout the flat, particularly during colder weather.

How have the new windows transformed light and internal space?

Internally, the upgrade to Lorimer sliding sash windows has significantly increased the amount of natural light entering the flat. This has been one of the most impactful changes for Ms Stanford’s home.

The previous windows relied on metal casings on either side of the panes to support the pivot mechanism. These casings required additional timber within the frame to provide structural support, resulting in thicker profiles and a reduced glass area. Combined with the inherent bulk of traditional timber frames, this design restricted the amount of daylight entering each room.

Due to the ingenious design of Lorimer sliding sash windows, they operate impeccably while retaining slim frames. This allows for a noticeably larger glazed area, enabling more natural light to flood into the living spaces.

The result is a home that feels brighter, more open and visually larger. This effect is further enhanced by the white internal finish on the windows, sills and surrounds, which reflects light further into each room and maximises brightness throughout the day.

How does the external finish enhance the building’s appearance?

Externally, Ms Stanford opted for an anthracite grey finish to introduce a contemporary twist while still respecting the building’s heritage.

The contrast between the anthracite frames and the dark red sandstone has created a striking visual effect, subtly modernising the facade while enhancing the overall character of the building.

What has been the overall impact of the upgrade?

The upgrade has delivered a perfect balance of traditional style and modern performance. Reduced maintenance, improved warmth and increased natural light have transformed how the home looks and feels, both inside and out.

This project in Glasgow demonstrates how well-selected window designs can preserve architectural charm while significantly enhancing everyday comfort. Lorimer sliding sash windows are an ideal choice for period properties, listed buildings and homes in conservation areas, as they replicate the look and functionality of timber sash and case but with all the added benefits of modern engineering.