For box sash windows
Thoroughly traditional look and function with tilt option

This secondary glazing option is perfect for heritage properties and modern buildings alike. Vertical sliders have a tilt option that enables both panels to individually pivot inwards for easy access and cleaning.

Ideal for when you’re unable to replace sash windows with modern double glazing in a listed or heritage property and wish to maintain sightlines of original windows. Secondary glazing sash windows are fitted discreetly on the inside giving you all the advantages of modern living without impacting the façade. They’re also lockable for additional security.

For modern properties, our sash window secondary glazing offers a vintage look. This enhances your property stylistically while preserving the modern comforts of 80% noise reduction and 65% extra thermal insulation.

Secondary Glazing Illustration
The Granada difference
Secondary glazing offers the most effective sound insulation. Reduces noise by up to 80% and significantly outperforms double glazing.
Improves thermal insulation of existing single-glazed windows by around 65%, approximately 10% more than double glazing achieves.
An affordable, discreet, highly effective solution to enhancing security. No external access required, ideal for multi-storey buildings.

Secondary Glazing for Sash Windows specification

Designed specifically for sash windows as well as other vertical sliding units, or where regular hinged panels are not suitable. Just like a traditional box sash, our vertical sliding units feature two sashes, one above the other, retained within an outer frame.  They are supported by robust spring balances for ease of motion and weight support and fitted with brass rollers of a smooth sliding action.


Special tilt-in feature

Each secondary sash can be independently released from the outer frame. It comes with restrictor arms as standard which, once removed, allows the unit to be be pivoted inwards by almost 180° making it easy to access all frames. The outside of the glass will be as easy to clean and maintain, without compromising either sightlines or the overall style of your windows.

Customised and guaranteed

We offer a range of 4mm – 8.8mm glazing for thermal requirements as well as reduced noise reduction within your property. You can decide whether you would prefer face-fixed or reveal-fixed and we boast a choice of over 200 RAL colours to match the look of your existing windows. The additional locking facility provides extra security and our 10-year guarantee means complete peace of mind. It remains one of our most popular options for conservation area buildings and is gaining favour even in more modern developments.

Features & Options of Secondary Glazing for Sash Windows
Annoyances solved
Annoyances solved
Noise, cold, security, condensation issues managed and controlled.
Multiple design options
Multiple design options
Historic, contemporary, or unusual designs. 200 frame colours, lift out panels.
Many glazing options
Many glazing options
From 4 – 8mm thickness to thermal coatings, all fully customised.
Full advisory service
Helpline for homeowner product, service or installation queries.
Full advisory service
Delivery or installation
Local installers trained and accredited by us or home delivered.
Delivery or installation
10 Year Guarantee
For all frames and glazing. British factory made, engineered to last.
10 Year Guarantee

A colour to suit your scheme

Find the perfect match for your Granada window insulation system using our range of over 200 RAL colours. Whether you own a new build, listed property or commercial property, we can fit your requirement.


Vertical Sliding Secondary Glazing FAQ's

What is vertical sliding secondary glazing?

Vertical sliding secondary glazing features the instal of an independent, vertical sliding window unit within the reveal of the primary window. Featuring a central push button release, our vertical sliding units can be operated from either the top or the bottom for ease of access. This product type is ideally paired with traditional sash windows.

What vertical sliding secondary glazing options are available?

There are three distinct versions of our vertical sliding secondary glazing. We offer a standard vertical sliding unit, a slide past vertical sliding unit where both panels are able to completely contra slide past one another and a tilt-in vertical sliding unit where the panels are able to pivot inwards for unlimited cleaning access and ventilation.

What are the advantages of vertical sliding Secondary Glazing?

Vertical sliding secondary glazing is an incredibly effective way to improve the thermal and acoustic performance of traditional sash windows. Perfectly matching the sightlines of the primary window, homeowners can benefit from a warmer and quieter home, without affecting their existing interior décor.

How does vertical secondary glazing stop heat loss?

Vertical sliding secondary glazing provides an extra layer of protection against potential draughts and cold spots. Tightly sealed frames lock in the heat and ensure minimal wastage is allowed to flow through the primary window. As homeowners look to combat the ongoing energy crisis, secondary glazing is becoming an increasingly popular choice.

How much does vertical secondary glazing cost?

Vertical sliding secondary glazing will reduce a homeowners’ energy bills, making it an incredibly worthwhile investment. Whilst prices vary depending on a number of factors, including window size and glass specification, it’s undoubtably a smart piece of business given ever increasing energy bills.

Start your secondary glazing journey today...

Get a free quote