Secondary Glazing Sydney

Secondary glazing improves the acoustic and thermal performance of existing windows without requiring complete window replacement. We provide both independent internal secondary glazing and compatible retrofit double glazing solutions for homes and properties across Sydney.

Keep your existing windows. Improve comfort. Reduce outside noise.

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Retrofit Glazing From An Experienced Sydney Team

25 Years Experience
Established experience in aluminium windows, doors and glazing.

Villawood Facility
Local Sydney manufacturing and service.

AGWA Member
Industry-backed aluminium window and door expertise.

HIA Member
Experience across residential building and renovation projects.

NATA-Tested Systems
Tested performance data available for applicable glazing configurations.

Improve Your Existing Windows Without Replacing Them

If your existing windows are still in reasonable condition, complete replacement may not always be necessary.

Secondary glazing adds an additional glazed layer to the existing window opening, allowing the original window to remain in place.

Depending on the property and existing frame, we can also assess whether retrofit double glazing is suitable.

Both approaches can improve the performance of an existing window while reducing the disruption associated with removing and replacing the complete frame.

They are particularly worth considering where:

Outside noise is the main concern
Existing frames are still serviceable
You want to minimise disruption
Changing the external appearance is undesirable
Full window replacement isn’t practical
You want to improve selected rooms rather than the entire property

What Is Secondary Glazing?

Secondary glazing involves installing a separate second glazed system inside the existing window.

The original external window remains in place.

This creates two independent glazed layers with an air space between them.

Existing Window

Your original aluminium, timber or other compatible window remains in position.

Independent Internal Glazing

A second glazed panel or window system is installed internally.

Wider Air Gap

The distance between the existing window and the new internal glazing can be considerably larger than the cavity inside a conventional double glazed unit.

Minimal External Change

Because the original external window remains, secondary glazing can preserve the appearance of the building from outside.

Secondary Glazing vs Double Glazing

Although both involve two layers of glass, they are fundamentally different systems.

	Secondary Glazing	Double Glazing
Existing window	Retained	Usually replaced
Glass arrangement	Two independent glazed layers	Two panes within one sealed IGU
Typical cavity	Wider independent air space	Narrow sealed cavity
Installation	Added internally	New compatible window system
External appearance	Original window can remain	New frame/window visible
Acoustic performance	Can be particularly effective for noise	Depends heavily on IGU specification
Thermal performance	Can improve existing windows	Generally the stronger purpose-built thermal solution
Disruption	Lower	More extensive
Reversible	Can be, depending on system	No
Best suited to	Noise, retained windows, minimal intervention	New or replacement high-performance windows

Which Is Better?

It depends on the problem you’re trying to solve.

Secondary glazing may be the better choice when:

Noise reduction is the priority
You want to retain your existing windows
External appearance needs to remain unchanged
Full replacement would be difficult or disruptive

Double glazing may be the better choice when:

You’re already replacing the windows
Thermal performance is the primary objective
Existing frames are deteriorated
You want a completely new window system

COMPARE YOUR OPTIONS

Why The Air Gap Matters

Why Secondary Glazing Can Work So Well For Noise

One of the biggest acoustic advantages of secondary glazing is the ability to create a much wider gap between the two glazed layers.

Standard double glazing contains two panes inside one relatively compact sealed unit.

Secondary glazing places the new pane further inside the room, creating a substantially deeper cavity.

For acoustic applications, that separation can be extremely valuable—particularly when addressing lower-frequency noise.

Performance still depends on:

Width of the air gap
Glass thickness
Laminated glass specification
Difference in glass thickness
Frame construction
Acoustic seals
Installation quality

Noise Reduction Section

Does Secondary Glazing Reduce Noise?

Yes. Secondary glazing can be an effective solution for reducing external noise entering through existing windows.

It can be particularly useful for homes affected by:

Traffic Noise

Reduce noise from busy roads, trucks and nearby arterial routes.

Aircraft Noise

Improve acoustic protection where recurring aircraft noise affects indoor comfort.

Rail Noise

Reduce sound entering homes located near railway corridors.

Neighbours

Help limit voices, music and general neighbourhood noise.

Construction & Commercial Activity

Improve indoor comfort where surrounding development or commercial activity creates ongoing noise.

The best result comes from matching the glass, cavity and seals to the type of noise affecting the property.

EXPLORE SOUNDPROOF WINDOWS SYDNEY

Retrofit Double Glazing Section

Retrofit Double Glazing Sydney

Retrofit double glazing is another way to improve an existing window without automatically replacing the complete frame.

Instead of adding a separate internal window, retrofit double glazing involves upgrading compatible existing frames to accommodate insulated glazing.

A double glazed unit contains two panes of glass separated by a sealed cavity.

When Retrofit Double Glazing May Be Suitable

Retrofit double glazing may be worth considering when:

Existing frames remain in good condition
The frame can accommodate the additional glazing thickness and weight
Thermal performance is a major priority
You want to retain the existing frame system
Complete replacement is unnecessary

Not every existing window can accept a double glazed unit.

Frame dimensions, glazing pockets, hardware and structural capacity all need to be assessed first.

Compatible Existing Frames

[CONFIRM EXACT FRAME TYPES: ALUMINIUM / TIMBER / STEEL / OTHER]

ASK IF YOUR WINDOWS CAN BE RETROFITTED

Secondary Glazing vs Retrofit Double Glazing

Which Retrofit Solution Is Right For You?

Because we offer both approaches, we can assess the existing window before recommending a solution.

Choose Secondary Glazing When:

Acoustic performance is the main priority
A wider air gap is desirable
The original glazing needs to remain
Minimal intervention is preferred
Changing the outside appearance is undesirable

Consider Retrofit Double Glazing When:

Thermal performance is the main objective
Existing frames are compatible
You want an integrated insulated glazing unit
You prefer not to replace the complete frame

In some properties, neither retrofit approach will be appropriate and complete window replacement may provide the better long-term solution.

Our role is to determine which option makes sense for the actual window—not simply recommend the most expensive one.

Thermal Performance

Can Secondary Glazing Improve Thermal Performance?

Yes. Adding another glazed layer can reduce heat transfer through an existing window and improve indoor comfort.

However, if maximum thermal performance is the primary objective, a purpose-designed double glazed window system will generally provide a more integrated solution.

That’s because thermal performance depends on more than the number of panes.

It also depends on:

Glass coatings
Cavity construction
Frame performance
Air leakage
Seals
Installation
Overall window design

Secondary glazing is particularly compelling where you want a balance of noise reduction, improved comfort and retention of the existing window.

EXPLORE DOUBLE GLAZED WINDOWS

Cost Section

How Much Does Secondary Glazing Cost In Sydney?

Secondary glazing costs depend on the size and number of windows, glass specification, system design, access and the condition of the existing windows.

Because the existing frame can remain in place, secondary glazing may avoid some of the labour, removal and finishing associated with complete window replacement.

However, the right comparison is not simply price per pane.

Consider:

Required acoustic performance
Thermal requirements
Condition of the existing window
Installation complexity
Appearance
Whether the solution needs to be reversible
Long-term plans for the property

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Installation Section

How Is Secondary Glazing Installed?

Secondary glazing is installed from inside the property while the original window remains in position.

1. Assess Existing Windows

We inspect the existing frames, glazing, seals and surrounding opening.

2. Measure The Internal Opening

The secondary system is measured to suit the individual window and available internal space.

3. Select The Glazing

Glass thickness and configuration can be selected according to your acoustic, thermal and safety requirements.

4. Manufacture The Secondary System

The additional glazing system is prepared to suit the opening.

5. Internal Installation

The secondary glazing is installed inside the existing window.

6. Final Adjustment & Inspection

The installation, seals and operation are checked before handover.

Because the external window remains in place, the process can be considerably less invasive than complete window replacement.

Reversible Solution

Can Secondary Glazing Be Removed Later?

Depending on the secondary glazing system used, it can be possible to remove the internal glazing while leaving the original window intact.

That makes secondary glazing particularly useful where permanent alteration of the original window is undesirable.

Condensation Section

Does Secondary Glazing Cause Condensation?

Condensation depends on indoor humidity, glass temperature, ventilation and the design of the glazing system.

Properly designed secondary glazing can improve the internal surface temperature of the window and may help reduce condensation in some situations.

However, moisture management between the original and secondary glazing needs to be considered carefully.

If condensation is already a problem, we can assess the existing window before recommending the most suitable configuration.

Maintenance Section

Is Secondary Glazing Easy To Maintain?

Secondary glazing is generally straightforward to maintain.

The exact cleaning method depends on whether the internal panel is fixed, hinged, sliding or removable.

A well-designed system should also allow reasonable access to the original window where required.

Durability Section

How Long Does Secondary Glazing Last?

Longevity depends on the frame system, hardware, glazing and installation quality.

Quality aluminium-framed secondary glazing requires minimal ongoing maintenance and avoids issues such as rot or swelling associated with some older window materials.

Regular cleaning and occasional inspection of seals and hardware can help maintain performance.

Appearance Section

Will Secondary Glazing Change The Appearance Of My Windows?

Secondary glazing is installed internally, so the original external window remains visible from outside.

Internally, the additional frame is designed to sit within or around the existing opening as discreetly as practical.

Frame colour and configuration can be selected to complement the surrounding window and interior finishes.

This can make secondary glazing particularly useful where preserving the external appearance is important.

Security Section

Does Secondary Glazing Improve Security?

Adding another internal glazed barrier can provide an additional physical layer between the room and the external window.

The degree of security improvement depends on:

Glass type
Secondary frame construction
Locks and hardware
Installation method

Where security is a priority, laminated or suitable safety glazing can also be considered.

Heritage Homes Section

Secondary Glazing For Heritage & Character Homes

Older properties often have windows that contribute significantly to their architectural character.

Replacing them may alter the appearance of the building or remove original features.

Secondary glazing can allow the original windows to remain while improving acoustic and thermal comfort from inside the property.

This can make it worth considering for:

Heritage homes
Character properties
Conservation areas
Original timber windows
Properties where external alterations need to be minimised

Planning and heritage requirements vary by property, so any required approvals should be confirmed before work proceeds.

Apartments & Strata

Secondary Glazing For Apartments & Strata Properties

Apartment owners can face additional restrictions when replacing external windows because windows may form part of the building’s external appearance or common property.

Because secondary glazing is installed internally and can leave the external window unchanged, it may provide an alternative worth considering.

However, strata rules vary between buildings.

Owners should confirm any required owners corporation approval before installation.

One Room Or Whole Home

You Don’t Have To Upgrade Every Window

Secondary glazing can be installed selectively.

If only one area of the home is affected by outside noise, you may only need to treat the windows in that room.

Common priority spaces include:

Bedrooms

Reduce nighttime traffic, aircraft and neighbourhood noise.

Home Offices

Create a quieter environment for calls and concentrated work.

Living Rooms

Improve comfort in areas facing busy roads or surrounding activity.

Nurseries & Children’s Rooms

Reduce disruptive external noise during sleep.

This makes secondary glazing particularly practical where a targeted solution is preferred over a whole-home replacement project.

When Replacement Is Better

When Should You Replace The Windows Instead?

Secondary glazing isn’t automatically the right solution for every property.

Complete window replacement may make more sense where:

Existing frames are deteriorated
Windows no longer operate correctly
Existing seals have failed badly
Frames require significant repair
You want to change window styles
Maximum integrated thermal performance is required
You’re already completing a major renovation

In these cases, replacing the entire window allows the frame, glass, seals and hardware to be upgraded together.

EXPLORE WINDOW REPLACEMENT SYDNEY

Keep The Windows. Improve The Performance.

Reduce noise and improve indoor comfort without automatically replacing your existing window frames.

GET A FREE MEASURE & QUOTE

FAQs

Frequently Asked Questions

What is secondary glazing?

Secondary glazing adds a separate second glazed panel or window system inside an existing window. The original external window remains in place.

Is secondary glazing the same as double glazing?

No. Secondary glazing uses two independent glazed layers separated by a larger space. Double glazing uses two panes contained within one sealed insulated glass unit.

What is retrofit double glazing?

Retrofit double glazing involves upgrading compatible existing window frames to accept a sealed double glazed unit rather than replacing the complete window.

Do you offer both secondary glazing and retrofit double glazing?

Yes. We can assess the existing windows and determine which approach is more suitable for the property and desired performance.

Which is better: secondary glazing or double glazing?

It depends on your priority. Secondary glazing can be particularly effective for acoustic improvement and retaining existing windows, while purpose-designed double glazing is generally better suited where maximum integrated thermal performance is the goal.

Is secondary glazing good for noise reduction?

Yes. The independent second pane and potentially wider air gap can make secondary glazing an effective acoustic solution.

Does secondary glazing reduce traffic noise?

It can significantly improve protection against traffic noise when the glass, air gap and seals are correctly specified.

Does secondary glazing reduce aircraft noise?

Secondary glazing can be suitable for aircraft noise, particularly where a larger acoustic cavity and appropriately specified laminated glass are used.

How big should the air gap be for secondary glazing?

The appropriate cavity depends on the available space and acoustic requirements.

Our available range: [CONFIRM].

Is secondary glazing better than standard double glazing for soundproofing?

For some noise problems, particularly lower-frequency sound, the much wider cavity available with secondary glazing can provide an acoustic advantage over basic double glazing.

Performance should still be compared using verified acoustic data for the exact configurations.

Does secondary glazing improve insulation?

Yes. Adding another glazed layer can reduce heat transfer and improve comfort, although a purpose-designed double glazed replacement window will generally provide the more integrated thermal solution.

Can double glazing be retrofitted into aluminium windows?

Sometimes. Existing aluminium frames need to be assessed to determine whether they can accommodate the thickness, weight and glazing requirements of an insulated glass unit.

Can secondary glazing be fitted to aluminium windows?

Yes, where the existing opening and internal space are suitable.

Can secondary glazing be fitted to timber windows?

Secondary glazing can generally be designed independently of the original external window, but the individual opening needs to be assessed.

Do I need to replace my existing windows?

No. The main purpose of secondary glazing is to improve an existing window while allowing it to remain in place.

Is secondary glazing suitable for heritage homes?

It can be particularly useful where retaining original windows or minimising changes to the external appearance is important. Any heritage approval requirements should still be checked for the individual property.

Can secondary glazing be installed in apartments?

Potentially. Because installation is internal, it may offer an option where external window changes are restricted. Strata requirements should be confirmed with the owners corporation.

Does secondary glazing change the outside appearance?

Generally very little, because the original external window remains in place and the additional glazing sits internally.

Is secondary glazing removable?

Depending on the system, secondary glazing can be designed to be removable or reversible.

Does secondary glazing cause condensation?

Properly designed secondary glazing can improve internal glass temperatures, but condensation depends on humidity, ventilation, cavity design and existing window conditions.

How much does secondary glazing cost?

Cost depends on dimensions, glass specification, frame system, access and the number of windows being treated. We provide project-specific pricing after assessing the existing openings.

Is secondary glazing cheaper than replacing windows?

It can be because the existing windows remain in place, but pricing depends on the project. The two options should be compared based on required performance as well as upfront cost.

Can I secondary glaze just one room?

Yes. Secondary glazing can be used selectively in bedrooms, home offices or other rooms most affected by external noise.

Do you provide secondary glazing across Sydney?

Yes. We provide secondary glazing and compatible retrofit glazing solutions for properties across Sydney.

Do you provide free quotes?

Yes. Send us photos of your existing windows, your suburb and details of the problem you’re trying to solve and we’ll help determine the most suitable option.

Service Area Section

Secondary Glazing Across Sydney

Innovative Aluminium & Glass provides secondary glazing and retrofit glazing solutions for homes and properties throughout Sydney.

Innovative Aluminium & Glass
1/189 Woodville Road
Villawood NSW 2163

Not sure whether you need secondary glazing, retrofit double glazing or complete replacement?

Send us:

Your suburb
Photos of the existing windows
Approximate window dimensions
Existing frame type
Whether noise or thermal comfort is the main issue

We’ll help you work out which approach makes the most sense.

Improve Your Windows Without Starting Again

If your existing windows are worth keeping, secondary glazing or retrofit double glazing may provide the improvement you’re looking for without the disruption of complete replacement.

Our team can assess your existing frames, discuss your noise and thermal requirements and recommend the most appropriate glazing solution.

GET A FREE MEASURE & QUOTE