Sash Windows
Available in 2 types Sash on Weights and Sash on Springs.
Upgrading your double-glazed sash windows is a significant investment in enhancing your property. To ensure your new windows not only look stunning but also stand the test of time, we recommend replacing the entire wooden sash window and frame instead of merely restoring the existing box sash window.
Our premium timber sash windows are available in your choice of engineered hardwood or engineered softwood, providing exceptional strength and durability. Each window features A-rated, argon gas-filled glazing and high-quality seals at every join, effectively eliminating cold spots and draughts. Plus, our products are factory-finished with micro-porous paint in elegant RAL classic colours, ensuring a flawless and long-lasting finish.
Invest in our timber sash windows for superior performance and timeless beauty that will enhance your home for years to come.

Sash on Weights
Sliding sash windows feature innovative double sprung balances, offering exceptional mechanical support. The dual springs provide balanced tension, perfectly matching the weight of our sash windows for smooth and effortless operation. With a robust 17mm diameter, Ultralift balances are ideal for standard timber box sash window designs.
Ultralift balances outperform traditional Spirex, Spiralift, and Aluma tilt balances by utilizing a double sprung mechanism. This design delivers up to a 75% increase in mechanical advantage, ensuring greater efficiency and smoother operation. Capable of supporting sashes up to 27kg, they are perfect for more substantial window frames.
Our timber sash windows with spring balances are engineered with a 65mm wide box at the top and sides to accommodate the springs, providing reliable support and durability.

Timber Sash on Weights
Details
- Glazing Options: Available in fully beaded, double or single glazed units (20-24mm sealed units).
Energy Efficiency: Equipped with energy-saving “Thermofloat” glass (Ug = 1.1 W/m²K), meeting certified U-values compliant with Building Regulations (Part L). - Innovative Technology: Features warm edge spacers for enhanced thermal performance.
- Traditional Design: Both bottom and top sashes are sliding with traditional weights, complemented by decorative horns.
- Quality Craftsmanship: Includes a hardwood sill that is flush-to-frame and fully finished in any classic RAL color.
- Durable Finish: Painted in a meticulous four-stage process: wood preservation, staining, interlayer top, and final coat.
- Complete Hardware Set: Comes with a full set of standard ironmongery from Caldwell/Roto, available in silver chrome, silver matte, or brass.
- Weather Protection: Fully draught sealed for maximum comfort.
- Classic Detailing: Features decorative vertical astragal bars.
- Quick Delivery: Lead time of just 20 working days.
Sash on Springs
Sash window weights are essential for counter-balancing sliding sash windows in a box frame, ensuring the sashes remain securely positioned at any height.
Our advanced design utilizes square steel weights, which are denser than traditional round cast iron weights. This allows us to fit more weight into the window box, perfectly balancing even the heaviest wooden sliding sash windows.
Our premium timber sliding sash windows are crafted with a 98mm wide box at the top and on each side, specifically designed to accommodate these efficient weights, providing you with smooth, effortless operation and long-lasting performance.
Timber Sash on Springs

Details
- Fully Beaded Glazing: Available in double or single glazed options (20-24mm sealed units).
- Energy Efficient Glass: Equipped with “Thermofloat” glass (Ug = 1.1 W/m²K) for superior insulation.
- Building Regulations Compliance: Certified U-values that meet Part L of Building Regulations.
- Advanced Technology: Features warm edge spacers for enhanced thermal performance.
- Smooth Operation: Bottom and top sashes slide effortlessly with a modern spring-loaded mechanism.
- Elegant Design: Includes decorative horns for a classic look.
- Durable Hardwood Sill: Designed flush-to-frame for a sleek finish.
- Customizable Finish: Fully finished in any classic RAL color, painted through a meticulous four-stage process: wood preservation, staining, interlayer top coat, and final coat.
- Quality Hardware: Comes with a complete set of standard ironmongery from Caldwell/Roto, available in silver chrome, silver matte, or brass.
- Weather Protection: Fully draught sealed to keep out the elements.
- Quick Turnaround: Lead time of just 20 working days.