01753 858196 info@boxsash.com

Secondary Glazing

Where double glazing is not a suitable option, secondary glazing can be an effective way to improve the comfort of your home and the performance of your traditional timber windows.

Our discreet secondary glazing fits snugly on the interior of your windows, leaving the original fittings intact and untouched, so you can enjoy all the benefits of modern, double-glazed windows, including lower levels of noise pollution, heat loss and energy expenditure.



Our secondary glazing can be tailored to suit your exact requirements, featuring the precise number and size of panels that you require, with single or double openers, and horizontal or vertical opening format for ultimate ease of use.

Window Type

Because all of our secondary glazing solutions are made bespoke to your personal needs, they can be installed on a wide variety of windows types, including sash windows, casement / hinged windows, in addition to out-of-square, shaped, arched or curved windows.

Lightweight Glazing

We are able to create a lightweight version of our secondary glazing solution for when affordability is paramount.

Despite its lower cost, our economical range of secondary glazing still delivers first rate benefits including enhanced heat retention, improved draught prevention and effective noise reduction.

Key Benefits


Crafted from the highest quality prime African hardwood, our windows and doors offer a range of unparralleled beauty and performance with lifetime guarantees.


Our windows and doors are double glazed with safety glass, and come with a premium quality locking system for your complete peace of mind.

Low Maintenance

Our beautiful traditional timber windows require minimal care and attention to keep them looking and working in premium condition for a lifetime.


We use seasoned prime natural African hardwood from Forestry Stewardship Council certified sustainable sources, combining elegance with environmental responsibility.

Lifetime Guarantee

For complete peace of mind, our superior quality timber windows come with a lifetime parts guarantee, all insured by the Independent Warranty Association. Glazing units come with a 10 year guarantee. 


Featuring classic mouldings, traditional timber horns, and counter-balance, pulley and cord systems, our inidvidually crafted windows and doors deliver a truly authentic feel.


Our products are finished with a high quality micorporus paint,  offering optimum, long-term resistance to the elements and easy maintenance.


Combining style and performance, our windows and doors are designed for maximum comfort and sealed against draughts, damp air, noise pollution and dust.

Energy Efficiency

A traditional product does not mean compromising on modern performance. Our flush sealed Argon filled windows prevent heat loss, helping you lower your energy bills. Beauty and performance combined.

The Original Box Sash Windows Company

The Joinery
29-30 The Arches
Alma Road

01753 858196