Why Use Sash Windows: Materials and Construction

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Welcome to Sash Window Refurbish

Experts in Sash Windows Repair & Restoration, Timber Windows & Timber Doors in east midlands

Why Trust Sash Window Refurbish?

Sash Windows Refurbish specializes in providing repair and restoration services for wooden windows and doors in the UK, as well as various types of carpentry. During the process of fulfilling orders, we utilize a range of tools and paints, including saws, sprays, primers, resins, and adhesives. With more than 20 years of experience in carpentry, we have tested and used various brands and types of work tools, making us well-equipped to offer helpful advice on selecting the right tools and paints for your needs. Read more ...

Sash Windows: Materials and Construction

Sash windows are meticulously crafted using a variety of materials, each chosen for its durability and aesthetic appeal. Wood, particularly high-quality timber like oak and mahogany, has been a traditional choice due to its strength and ability to be intricately carved.

Modern advancements have introduced materials like uPVC, which offer excellent insulation and low maintenance. The careful selection of materials ensures that sash windows not only look exquisite but also endure the test of time, requiring minimal upkeep.

What are box sash windows?

Box sash windows, also known as sliding sash windows, represent a classic architectural feature that has been reinvented to meet modern standards of energy efficiency and security. These windows consist of two sashes that slide vertically within a frame, allowing for effortless ventilation and ease of use.

Box sash windows are designed with precision, ensuring a seamless balance between traditional aesthetics and contemporary functionality. Their ability to complement diverse architectural styles makes them a versatile choice for both historic buildings and newly constructed homes.

What is a windows sash?

The term ‘sash’ in windows refers to the individual movable panels that form the window. These panels, known as sashes, are fitted with weights, cords, and pulleys, allowing them to move smoothly within the window frame.

This ingenious design not only facilitates easy opening and closing but also provides excellent control over ventilation, making sash windows an ideal choice for rooms where air circulation is crucial. The term ‘sash’ encapsulates the very essence of window elegance, embodying both form and function in a single architectural element.

Benefits of Sash Windows

Sash windows offer a plethora of benefits to homeowners. Their timeless beauty enhances the curb appeal of any property, adding character and charm. Moreover, their unique sliding mechanism allows for efficient airflow and natural ventilation, promoting a healthier indoor environment.

Additionally, sash windows provide excellent insulation, helping to maintain a comfortable temperature within the home and reducing energy costs. Their versatility in design and ease of operation further contribute to their popularity among homeowners and architects.


Choosing sash windows isn’t merely an architectural decision; it’s a celebration of heritage, craftsmanship, and the art of blending beauty with practicality. Embracing sash windows means embracing a legacy of timeless sophistication and a window into a world where style meets substance.


What is the frame for a sash window made from?

The frame for a sash window is typically made from wood, although modern versions can also use materials like uPVC or metal for enhanced durability and energy efficiency.

What timber is used for sash windows?

Various types of timber can be used for sash windows, with popular choices including oak, pine, and mahogany. The selection often depends on factors like cost, availability, and desired aesthetics.

What type of glass is used in sash windows?

Traditional sash windows use single-pane glass. However, modern versions often employ double or even triple-glazed glass to improve insulation and energy efficiency.

What were Victorian sash windows made from?

Victorian sash windows were typically crafted from softwood such as pine. These windows were characterized by their elegant design and functional features like counterweights for smooth operation.

What is the best material for sash windows?

The best material for sash windows depends on specific needs. Wood provides a classic look and can be energy-efficient with proper insulation. uPVC is low-maintenance and durable, while metal frames offer excellent strength. The choice varies based on preferences, budget, and desired performance.

About the author

Glen Ramsey, who presently holds the positions of customer support and content manager, is a cherished member of the Sash Window Refurbish team. He is in a unique position to provide advice on all questions pertaining to the renovation of historic windows because he has a wealth of experience in all elements of window renovation, dealing with clients regularly and assisting them in choosing the best window-related course of action. He oversees the creation of information for all of our platforms in his capacity as content manager, including web content and other materials. Glen has witnessed the whole gamut of Sash Window Refurbish's window restoration activities, from our work on significant listed Georgian homes to a wide variety of smaller-scale private residential projects.


My technician Andrew replaced all my sash windows that had rotten sills. Accessing the rotten sills was not an easy task. He explained to me what needed to be done in order to fix the problem. He is a great person and I’m happy that he was the one who did the job. He is reliable, tidy, friendly and very professional. I highly recommend him.



I hired Andrew and Alex a while back to repair my damaged sash windows. They were was very considerate and very patient as he did his job. A few days ago, I had another problem with one of my sash lock keys and I called him again to come and fix the problem. I’m very impressed that Liam responded quickly and he not only fixed the problem but he also gave me a spare key. What a great after sales service!

Alan W.


I’m very impressed with the new windows that Andrew installed and also the reconditioning job that he did on other sash windows. The quality of his work is by far more superior than what we got when we hired another company a few years back. We will certainly hire him again if any window work arises

Kelly (Sleaford)


Our decorator referred us to Andrew because some of the work needed a window expert. Andrew together with our decorator did a fantastic job. The work was done efficiently and to the highest standards. Andrew is understanding, committed and very professional. I recommend him without any hesitation.

Steaven Reader


Alex did a great job in fixing windows in our terraced house. The windows were broken, frames damaged and the wood was also rotten. Alex's job was high quality and he did it pretty fast. I was also very impressed that he was considerate of my son’s asthma condition and maintained cleanliness. Top work.



Andrew just recently replaced three sash windows in my Edwardian house. He also repaired and replaced some sills and draught proofed three windows. In addition to that, he also did some carpentry work. What I like the most about Liam is that he did a clean job. He is very professional and always updated me about the timescales and costs. He also did his job with minimal disruptions. I highly recommend him.

Cris M.