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Secondary glazing

Secondary glazing adds a second pane of glass inside your existing window. It cuts heat loss and noise for a fraction of the cost of new windows, and it suits heritage homes and renters too.

Find local installers How it works

A common sign

“We can’t replace our old windows, but the house is so cold.”

Secondary glazing is made for that situation. It works with the windows you already have, so the original frames can stay.

About secondary glazing

Better windows without replacing them.

A secondary glazing panel sits inside your existing window frame, creating a layer of air between the old glass and the new pane. That layer slows heat loss and reduces outside noise.

It’s a good fit for heritage homes, where the original windows need to stay, and for older timber windows that are still in good condition. Some panels can be removed, which can suit renters who want to take them when they move.

Helps with

Cold rooms in older homes

Helps with

Heritage windows that must stay

Helps with

Street noise on a budget

Worth knowing

Secondary glazing works best when the original window is in good condition. If the frame is rotten or won’t close, it may need repair first.

Not sure where to start?

Stop guessing, start saving: find your home’s energy score.

Don’t waste money on upgrades you don’t need. A professional home energy assessment shows where your house loses heat and power, so your budget goes where it makes the biggest difference.

Find an assessor near me

Secondary glazing installers

Find secondary glazing installers near you.

A few of the 13 listed across Australia

A modern glass and steel home on a sloping block at dusk, with solar panels on the flat roof.

Stop Noise

4.5 77 Google reviews

Secondary glazingWindow and door replacement

Based in Carrum Downs

A pair of modern duplex homes in black and natural timber cladding, with solar panels on both roofs.

Challenger Glass and Glazing

4.9 40 Google reviews

Window and door replacementSecondary glazingRetrofit double glazing

Based in Mount Evelyn

A cedar clad contemporary home at dusk with solar panels on the roof and a lit stone path.

homeenergydoctor.com.au

Home energy assessments and auditsDraught and weather sealingSecondary glazingThermal imaging and insulation scansDraught and air leakage testing

Based in Yarragon

A pair of brick and timber townhouses with a green roof garden and solar panels.

The Window Replacement Company

5.0 48 Google reviews

Window and door replacementSecondary glazing

Based in Carrum Downs

A restored red brick Federation house with solar panels on a new metal roof.

Specialised Glass and Glazing

5.0 19 Google reviews

Double glazed aluminium windowsWindow and door replacementSecondary glazingRetrofit double glazing

Based in Woodend

More in windows and glazing

Other upgrades in this category.

Large white framed double glazed windows set into the pale stone wall of a modern home, a sunlit living room and gum trees reflected in the glass.

uPVC double glazed windows

The warmest frame of the common options, and the quietest. A full replacement rather than a retrofit.

Large black aluminium framed double glazed windows, one awning sash open, set into the pale stone wall of a modern home with a sunlit living room inside.

Double glazed aluminium windows

Slim frames with a thermal break. Common where the look of the original windows has to be kept.

A dark-framed casement window open on the curved rendered wall of a modern home at golden hour, floor-to-ceiling glass and a living room behind it.

Triple glazed windows

Three panes for the coldest rooms and the noisiest roads. Rare in Australia and worth asking who has actually fitted it.

The original white timber casement windows of a 1930s bungalow, now double glazed, one open onto a garden of gum trees in warm afternoon light.

Retrofit double glazing

Double glazed glass fitted into the frames you already have. The frames stay and only the glass changes.

A tradesman in navy workwear fitting a new white front door with a frosted glass panel on the verandah of a weatherboard home.

Window and door replacement

Not every glazing job is double glazing. Rotten frames, jammed sashes and doors that never sealed properly.

Before you choose an installer

See our guides on windows and glazing.

Windows Double glazing, secondary glazing, or curtains Three very different price brackets solving the same problem. What each one genuinely does, and when the cheapest option is the right one.

Insulation Where the heat actually leaves your house Ceiling, walls, floor, windows and gaps, in the order they matter, and what each one is worth in a typical brick veneer home.

Start here The right order to upgrade your home Insulation before heat pump sizing, sealing before ventilation, and solar later than you would think. The dependencies nobody explains before you are quoted.

Related goal

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See every way to improve your windows, from adding a second pane to full replacement.

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