Timber Sash Windows
Our timber sash windows blend traditional charm with modern performance, perfect for period properties and equally at home in new builds. Crafted from high-quality, sustainably sourced timber, they offer excellent durability, energy efficiency, and sound insulation.
Designed with authentic detailing, including glazing bars, mouldings, and architectural hardware, our windows meet the highest performance standards, including thermal efficiency, acoustic insulation, and PAS 24 security. Whether you’re restoring a heritage home or enhancing a new one, these sash windows can even be incorporated into bay window structures, offering a high-performance solution that preserves your home’s historic character.
30-year guarantee on timber
10-year guarantee on Paint finish
5-year warranty on ironmongery & seals
10 years on Workmanship
10 years on Glazing
Mechanisms
Our timber sash windows are available with two traditional operating mechanisms: spiral balance or cords and weights, offering both modern convenience and classic design.
Spiral Balance
Spiral balance mechanisms offer a modern alternative to the Traditional Cords and Weights method of operation. It is a spring-based counterbalance system that helps you lift, lower and hold the sash window in place.
In each side of the window frame there is a narrow tube containing a spring, which is set to match the weight of the sash. This spring is connected to a sliding component called a pivot shoe, which sits in a vertical track. The sash has small pivot bars that lock into these pivot shoes, so when the sash moves up or down, the shoes and springs move with it.
The springs are pre-tensioned to match the weight of the sash. As you lift the window, the springs unwind slightly while pulling upward, offsetting the sash’s weight so it glides smoothly. When you lower the sash, the springs wind tighter and resist the downward motion, preventing it from dropping. Because the force from the spring and gravity balance each other at different heights, the sash will stay open wherever you leave it.
The benefits of a spiral balance mechanism are it eliminates the need for old-fashioned cords and counterweights. Frames are half the size, allowing you to maximise openings without losing glass area. Good examples of this are narrow bay windows, in dormers , or new build openings. The mechanism is more rigid, allowing improved compression between the sashes and frames, giving improved insulation and noise reduction.
CORDS AND WEIGHTS
Cords and weights are the traditional method for hanging a sash window; they incorporate an authentic pulley and weight-lifting system that has been used in English window design for centuries. Heavy-duty sash cords run over pulleys, providing smooth, balanced operation while remaining true to original construction methods.
This profile is ideally suited to stone or brick properties where the frame work is hidden behind a reveal. Most commonly found in heritage properties and prestigious refurbishment projects. Our cords and weights sliding sash window faithfully preserves the character, proportions, and charm of period architecture, making it particularly suitable for conservation-led schemes, while discreetly integrating modern timber technology, enhanced security, and improved thermal performance for contemporary living.
Profiles
We supply and install timber sash windows in two different profiles
Traditional
Perfect for everyday London homes, our traditional sash window combines the charm of heritage design with the benefits of advanced materials and manufacturing techniques, ensuring durability, energy efficiency, and ease of use. Whether renovating a period property or adding character to a more contemporary space, our traditional sash window preserves the essence of traditional London architecture, making it an ideal solution for homeowners who value both style and practicality.
Heritage
Our Heritage Timber Collection is designed to replace original period windows in listed buildings and conservation areas, offering tailored, made-to-order designs that meet planning authority requirements. This collection features options for slimline 14mm double glazing, 8mm vacuum glass, or advanced single glazing that outperforms triple glazing both thermally and acoustically.
Bespoke Timber Sash Windows
Our timber sash windows exude timeless elegance, combining period charm with classic character.
These high-quality sash windows are appropriate not only for period properties but also for new builds where the sash windows are required to meet thermal, acoustic and PAS 24 security standards.
Designed with all the traditional detailing and carefully selected decorative features such as glazing, bars, mouldings and architectural hardware, they can even be incorporated into sash bay window structures.
Timber materials and expert craftsmanship
We use only FSC-certified, responsibly sourced woods that are carefully selected to complement the architectural character of each project. By pairing high-quality materials with precision joinery, we create windows that look authentic, perform reliably, and last for decades.
Our Cornish workshop combines traditional skills with modern machining technology to ensure every frame meets exact specifications. Choose from a range of timber:
Redwood
A versatile softwood valued for its thermal properties and engineered stability. Redwood reduces the risk of warping or twisting, making it an excellent choice for painted wooden sash or casement windows where fine detailing and long-term performance are essential.
Red Grandis
A plantation-grown hardwood with a uniform grain, Red Grandis balances durability with design flexibility. It accepts both paint and stain finishes, offering a resilient option for wooden bay and casement windows that must withstand exposure while maintaining a refined appearance.
Accoya®
One of the most advanced modified timbers available, Accoya offers exceptional resistance to rot, outstanding stability, and impressive energy performance. It is a future-proof choice for double-glazed wooden windows, providing a low-maintenance, high-durability solution for both Heritage and contemporary builds.
We also offer
Heritage Sash Windows
Preserving the authentic character of your home is very important across London and the surrounding areas.
Period and historic buildings deserve particular attention to detail when considering the replacement of windows. The Heritage range has been specifically designed for listed buildings where approval is required.
Our team have a wealth of experience in dealing with listed buildings and conservation areas. Heritage Windows are available in our sash or casement range, featuring lambs tongue and putty bead mouldings and bars, Heritage Ventlock for child safety, decorative horn detail, and slim frame sections.
Timber Casement Windows
Timeless timber design built to perform in modern homes.
Our made to measure timber casement windows are expertly crafted from high quality timber and designed to suit a wide range of property styles, from period homes to new builds.
They deliver strong thermal performance, reliable security and smooth everyday operation, while retaining the clean proportions and detail expected from a classic casement window. With flexible configuration and finish options available, they offer a durable, well balanced solution that looks right and performs exceptionally well.
Sash Window Horns
We offer three classic sash window horn designs, each carefully crafted to complement the traditional character of your timber sash windows. Sash horns extend from the lower corners of the top sash and were originally an integral structural feature, designed to add strength to the window. Today, they remain an important decorative detail, enhancing the authentic period appearance of the window. Select a horn style below to view its design.
01
Kensington horn
The Kensington horn is a classic sash window horn design that adds a refined period look to your timber sash windows. It projects subtly from the lower corners of the top sash, enhancing the traditional character while preserving the elegant proportions typical of historic London homes.
02
Westminster Horn
The Westminster horn offers a more stately and distinctive profile, ideal for properties where a stronger heritage aesthetic is desired. Its shape reflects architectural detailing often seen in grand Victorian and Edwardian-era windows, giving sash windows a timeless and distinguished appearance.
03
Richmond Horn
The Richmond horn blends classic style with a slightly more expressive form, adding decorative flair to your timber sash windows. Like other horn styles, it accentuates the traditional look of the window while remaining faithful to period design cues.
See our range of Sash Window furniture
The Sash Windows London Difference
Our timber sash windows combine timeless style with the latest advancements in thermal efficiency, acoustic insulation and security.
Choose from traditional or heritage profiles to match your home’s character, whether you’re preserving a listed building or enhancing a contemporary space.
Our expertise ensures a seamless process, from design to installation, for any property in London or the surrounding areas. Contact us today for a free consultation and let us bring period elegance and modern performance to your home with our expertly crafted timber sash windows.
