What is a flush sash window?

A flush sash window sits level (flush) and even with the outer frame of the window. Compared to a traditional window, where the sash overlaps the frame. This creates a modern, smooth look with the window frame being totally flat. If you want a contemporary look with crisp, clean lines, these windows are an ideal choice. Plus, they are available in a range of on-trend colours as well as options for a traditional style with timber joints.

Our flush sash windows from Kömmerling allow you to enjoy exceptional benefits. Thanks to a highly engineered frame and exceptional seal integrity, they offer class-leading energy efficiency, which surpasses that of other window systems. The flush sash window range provides superior sound insulation of up to 42dB. This can equate to a reduction of exterior noise within most homes of over 50% and is higher than most, if not all, window systems on the market. So, you can say goodbye to those overly loud outside sounds and enjoy all the other benefits of our flush sash windows, such as excellent heat insulation and hugely increased security.

HeatGuard’s Flush Sash Windows

The design of the flush sash windows uses two panes of glass, as well as an added layer of inert gas in-between the panes. The extra layer helps to withstand the force of any impact, meaning it is practically impossible to break through the entire window in one go. Instead, it involves considerable amounts of time, effort and noise, which would alert any nearby neighbours or passengers. These windows also feature multipoint locks along with push-button keylocking features on the handles. These additional measures provide another barrier to entry and leave you feeling more comfortable in your home.

Reviewing the benefits of the flush sash windows such as the style, colour options, and the extra added security and combine them with HeatGuard’s super insulating double or triple glazing it produces one the most thermally evolved windows around. These windows are an exceptional investment in both the short and long term, improving your quality of life, while also boosting your property’s value.
 

Importance of the buying decision

At HeatGuard, we understand these can be important decisions, and we want to put you, the customer, first. That’s why we have produced an article highlighting our efforts to recognise this, as well as explaining our history and processes. Thereby, aiming to help you in the best possible way to make your home improvement decision. You can read that here.

If you would like to contact us click here.

If you would like a free quote click here.

© 2026 HeatGuard Windows Ltd | Privacy Policy | Cookie Policy | Terms Conditions

Free Quote

Home

Contact Us