Spring Balance Timber Sash Windows
Spring Balance Wooden Sash Windows in Hidden and Visible Options
Our spring balance timber sash windows combine classic proportion with modern engineering. Designed for smooth operation and long-term reliability, they’re ideal for both period-style new builds and renovation projects where cords and weights are impractical.
Hidden Spring Balance Sash Windows
Our most popular design features a concealed spring mechanism integrated within the sash and frame, delivering the appearance of a traditional sash window without visible cords or weights.
The result is a clean internal reveal, ideal for modern interiors or new-build specifications that call for flush reveals. Every sash is precision-balanced to ensure smooth operation, reliable sealing, and long-term durability.
Key Features:
Concealed spring mechanism hidden within frame and sash
Factory double-glazed: 4 tough Low E / 16 Argon / 4 Clear (Part L compliant)
Internal glazing for improved security and easier maintenance
Fully weather-stripped for excellent acoustic and thermal performance
Engineered European Redwood as standard with hardwood cill
Key-locking sash catches and lifts in brass, satin chrome, or polished chrome
Restrictors and top latch in polished chrome
Spray-finished in RAL 9016 or any RAL colour using a durable microporous system
Centre-pane U-value of 1.1 W/m²K
Design Flexibility
All our spring balance sash windows are made to order, with flexible configurations for single, double or triple sashes (Venetian layout). Choose from a range of glazing bar designs including Ovolo or Lamb’s Tongue profiles in widths of 17 mm, 20 mm, 22 mm, 24 mm and 36 mm.
Each window is precisely measured and manufactured to achieve a perfect fit and consistent detailing across your project.
Visible Spring Balance Sash Windows
Our Visible Spring Balance sash windows offer the same reliability and smooth operation, with the spring balance mechanism positioned externally within the side channel.
This option is often specified by developers and builders who need a cost-efficient sash window system without compromising on quality.
Key Features:
Visible spiral spring balance system
Engineered European Redwood with hardwood cill
Factory double-glazed 4 tough Low E / 16 Argon / 4 Clear
20 mm Ovolo glazing bars available
Internal beading for secure glazing and easier glass replacement
Weather-sealed and spray-painted in a microporous finish
Centre-pane U-value of 1.1 W/m²K
Timber Options
Our sash windows are made from multi-layer engineered timber for strength, stability, and resistance to movement. Each timber type offers its own character and performance level to suit different projects and budgets.
Engineered European Redwood – standard softwood for stability and performance.
Meranti – dense and durable hardwood with a fine grain and consistent texture.
Sapele – strong, stable hardwood with rich colour and tight grain pattern.
Oak – premium hardwood option.
Accoya – ultimate dimensional stability and 50-year rot-free guarantee
All timbers are multi-layer engineered to resist twisting and warping.
Glass Options
We offer a choice of high-performance glazing to meet a range of design, energy, and acoustic requirements. Each unit is factory-sealed and tested for durability, ensuring long-term clarity, insulation, and protection for your home or project.
Standard Double Glazing (4 / 16 Argon / 4 Low E) – Part L compliant
Vacuum Glazing – ultra-slim 8.3 mm units with centre-pane U-value 0.4 W/m²K
Acoustic Glass – enhanced noise reduction
Obscure Glass – satin, reeded, or patterned styles for privacy
Decorative Glass – stained, bordered, or etched designs available on request
Ironmongery
We supply a range of durable, high-quality fittings that complement both traditional and contemporary interiors. Each component is tested for strength, ease of use, and long service life, giving you the flexibility to match finishes across your project.
Polished Brass, PVD Brass, Satin Brass, Antique Brass, Polished Chrome, Satin Chrome, Antique Pewter, Oil Rubbed Bronze, Matt Black
Additional PAS 24 security hardware available for new-build compliance.
We also work with leading architectural ironmongery suppliers if you’re looking for a more refined finish.
Downloads
Access detailed resources to help plan and specify your project.
Our technical drawings include typical sections and elevation details for both hidden and visible spring balance sash windows.
Our quality & service are very important to us…
What Our Customers Say
We’re proud to be rated Excellent on Trustpilot, with genuine feedback from clients who have chosen our timber windows and doors.
