Secondary Glazing For Residential & Commercial


North London Secondary Glazing Co

Specialists in Insulation & Soundproofing for Windows & Doors.

We are a specialist supplier of Secondary Glazing and Acoustic Glazing Treatment for Sound proofing windows, with over 35 years of experience in all types of Window Insulation, serving North London and surrounding areas.

Tall secondary glazing window garden view

Secondary glazing is a slim, completely separate internal window or door, fitted to the inside of the existing window or door.
Our secondary glazing system is very discreet-made and fitted to blend in to the existing windows and doors, it is

Our system

Manufactured from slim extruded aluminium frames.
As standard has a durable white gloss finish & other colours available.
Glazed with various types of 4mm, 6mm, or 6.4mm glass.
Available in different units types to match different types of existing windows and doors.
Designed to allow easy access to the existing primary windows for ventilation and cleaning.
Suitable for installation to almost all types of existing windows and doors.

Secondary Glazing for Insulating Windows & Reducing Noise

Are your windows noisy, cold & draughty ?

If your windows are single glazed, then installing secondary glazing will upgrade them to modern window insulating standards.

The secondary windows will also provide additional benefits.

Reduced heating bills

Much cheaper than replacement double glazing

Improved Energy Performance Certificate

Window draught proofing

Condensation on windows resolved

Increased security

Decreased noise

Retains the character of Traditional and Period Windows

Window on stairs secondary glazed with stained glass

Is noise a major issue for you ?

If you are consistently irritated by noise from neighbours or road traffic we can incorporate 6.4mm Stadip silence glass.

Silence glass is a laminated glass product with an interlayer designed to minimise sound transmission through the glass, reducing the effects of external noise pollution, such as road traffic and aircraft.

Benefits include.

Excellent sound reduction

Safety Glass


UV protection

secondary glazing window-looking out dual carriage way
secondary glazing single window street van

Secondary Glazing For Sash Windows

If you ever had a price for replacing sash windows, then you know just how horribly expensive they are.

Additionally, many are in Listed Buildings, Conservation Areas and Apartment Blocks, where double glazing is prohibited.

We have the solution:

secondary glazing window-looking out to front garden
secondary glazing window looking out on houses

Spiral Balance Vertically Sliding Secondary Windows

The spiral balance system allows the secondary glazing to duplicate the normal  up and down movement of a traditional sash window-including leaving it in the open position for ventilation.

The individual pre-tensioned spiral spring balances control the vertical motion of the sashes, enabling easy fingertip positioning and repositioning.

They blend in perfectly with your existing sash windows !

secondary glazing window bathroom
secondary glazing window looking out to front patio

Secondary Glazing For Heritage & Listed Buildings Double Glazing

If you have a heritage property and / or do not have permission to change the existing windows, then secondary glazing is the best way to improve the property`s energy efficiency and sound proofing,whilst retaining your home`s character and authenticity.

We are fully experienced installing secondary glazing to Heritage, listed, conservation and character properties.

The Benefits of Secondary Glazing for Historic and Listed Buildings.

Secondary does not alter the external facade

Accepted by & specified by Planning & Conservation Officers

An economic solution

Protect the value of the property

Colour matching to any RAL Colour

In most incidences does not require planning permission

Our Services


We install to all types of properties throughout North London and surrounding areas
Call or Click to Call 0744 025 6503




Letting Agents

Property Maintenance & Management Companies





Churches, Village Halls, Mosques & Temples


Schools & Universities

Dance and Recording Studios

Historic, Listed & Conservation Buildings

Care & Rest Homes & Hospices

Pubs & Clubs

Museums & Galleries

Call or Click or Email us

white window red wall

The support team is here to help, tell us about your project.

Please enter your name.
Please enter a message.