Sash Windows
Heritage proportions. Modern performance.
Bespoke Timber Sash Windows
Sash windows are traditional vertical-sliding timber frames in which one or both sashes open using either classic cord-and-weight pulleys or modern concealed spring balances. The design originated in Georgian and Victorian Britain, giving period homes their characteristic slim meeting rails, fine glazing bars, and perfectly balanced proportions.
Contemporary sash windows retain these elegant sightlines while incorporating modern performance features such as Low-E double or slimline heritage glazing, warm-edge spacers, and continuous draught seals. Ventilation is naturally controlled by opening both top and bottom sashes to create a stack effect, improving airflow without outward-projecting leaves.
We offer a wide range of configurations, including bay, bow, and arched designs, bespoke glazing bar layouts, and any RAL or stained finish. All specifications can be tailored to meet Parts L and F requirements, with PAS 24-ready security for Part Q compliance.
Types of Sash Window
Two balance systems cover almost every brief. Pick the mechanism; keep the proportions, glazing, and seals consistent.
Box Sash
Traditional pulleys with hidden weight boxes in the jambs. Smooth, durable, and fully serviceable; ideal for period and conservation work. Requires deeper reveals; delivers the most authentic sightlines
Spiral Balance
Concealed spring balances remove the need for weight boxes, allowing slimmer frames and easier installation in tight reveals or new build. Clean operation with settable tension; option tilt-in for cleaning
For more configurations don't hesitate to contact us
Why choose Sash Windows
Our sash windows combine traditional elegance with modern performance. Each window is made-to-measure in our factory by skilled craftsmen, ensuring exceptional detail, durability, and energy efficiency.
Heritage correctness
Authentic sightlines, slim meeting rails, and true bar layouts that preserve period character in conservation settings.
Smooth vertical travel
Balanced cord-and-weight or spring systems for quiet, low-effort operation with reliable alignment.
Energy performance
Low-E double or slimline units with warm-edge spacers and continuous seals to cut heat loss and draughts.
Acoustic calm
Laminated and asymmetric glazing options that reduce street noise for quieter rooms.
Ventilation control
Top–bottom opening for stack effect airflow, with discrete trickle vents to satisfy Part F.
Security options
Key-locking fasteners, restrictors, reinforced meeting rails, and PAS 24–ready specs for Part Q projects.