Sash window restoration and double glazing in Lincolnshire

We recently completed a fascinating sash window restoration and vacuum double glazing project in Lincolnshire, despite this location being a bit farther than our usual service area in East Anglia. The homeowners somehow found in the internet, and given the historical significance of the property, we were excited to take on the challenge.

This property is a beautiful Edwardian-period house, constructed in 1903, featuring classic sandstone detailing and original sash windows. The house has retained much of its architectural integrity over the years, but the aging wooden windows were inefficient, leading to heat loss and draughts, and detracting from the overall comfort of the home.

Our task involved retrofitting the original wooden sash windows with vacuum double glazing, an advanced glazing insulated with vacuum that significantly improves thermal insulation of any window without compromising the appearance of the historic windows​​.

We carefully removed the sashes, repaired the frames, and fitted them with vacuum insulated glass. This modern glazing technology has an impressively low U-value, which translates to exceptional energy efficiency and comfort inside the home​​.

Objectives and project process

Our primary objectives were to enhance the energy efficiency of the property, reduce draughts, and preserve the aesthetic of the original windows. Vacuum glazing was the ideal solution as it offers the highest insulation performance while being thin enough to fit within the traditional sash profiles​​.

Process highlights:

1. Window Removal and Restoration: We began by carefully removing the existing sashes from the frames. Each window was meticulously restored—damaged timber sections were repaired, and new sash cords were installed to ensure smooth operation.
2. Double Glazing Installation: After restoration, the original glass was replaced with vacuum-insulated glazing. This type of glass is incredibly efficient, with a U-value that can be as low as 0.4, ideal for reducing heat loss​​. The slim profile of the vacuum glazing meant it seamlessly fit into the existing window frames, maintaining the period look.
3. Draught-Proofing: We also implemented draught-proofing measures to seal any gaps around the sashes, significantly enhancing the overall energy performance of the windows​​.
4. Finishing Touches: Once all glazing was installed, the frames were spray-painted to achieve a durable and even finish. We also fitted new locks for added security.

Result

The project was completed within 1 week. The final result is an impressive blend of heritage conservation and modern efficiency. The house retains its period charm, but now benefits from reduced heat loss, no draughts, and improved comfort.

Homeowners will see energy savings over time while enjoying the peace of mind that their restored windows can last decades.​