Double Glazed Windows Cost Sydney: 2026 Price Guide

How much do double glazed windows cost in Sydney?

As of October 2026, new double glazed windows cost about $600 to $2,000 or more per window, installed. That is the range given by the NSW Government’s Climate and Energy Action website. It says the price depends on the size of the window, the frame material and other features.

What’s The Damage’s Sydney glazier guide (updated October 2026, prices include GST) gives these low, typical and high figures:

• Retrofit double glazing into existing single-glazed frames: about $400, $750 and $1,200 per window
• Replacing a failed double glazed glass unit (the sealed pane fogs up inside): about $300, $600 and $1,200 per window
• Whole-home reglazing or double glazing: about $8,000, $18,000 and $40,000

The two sources measure different jobs. The NSW Government figure is for a double glazed window installed, while the retrofit figure is for new glass in frames you already have. That is why the retrofit range starts lower.

All of these figures are indicative only. Use them to plan a budget, and get written quotes after a measure and inspection.

Retrofit or new windows: which job do you need?

Work out which kind of job you are asking for before you compare prices.

• Retrofit double glazing: the glazier removes the single pane and fits a double glazed unit into your existing frame. This can suit sound timber or aluminium frames that are in good condition and deep enough to hold the thicker glass.
• New double glazed windows: the whole window, frame and glass, is removed and replaced. This makes more sense when frames are rotten, warped, rusted or leaking, or when you want a different style of window.
• Replacing a failed unit: if a double glazed window has gone cloudy or has moisture between the panes, the seal has usually failed. Often only the glass unit needs replacing, not the frame.
• Secondary glazing: a second layer of glass or clear acrylic is fitted inside the existing window. It can suit heritage homes and apartments where replacement is not possible.

A good glazier will check your frames first and tell you which option suits each window.

What drives the cost of double glazing

These are the main cost drivers named by What’s The Damage and the NSW Government.

• Window size and number: bigger panes cost more, and the total grows with every window.
• Glass type and thickness: standard float glass, toughened glass, laminated glass for noise or safety, and low-e coatings for heat control all price differently.
• Access: upper-storey windows, large panes and tricky access add labour. Some jobs need a second glazier or extra equipment.
• Frame condition: rotten timber, rusted steel or damaged aluminium may need repair before new glass can go in.
• Custom work: unusual shapes, coloured glass and made-to-order frames take longer to make and fit.
• Frame material: aluminium, thermally broken aluminium, uPVC and timber frames all differ in price and in how well they insulate.
• Making good: patching plaster, render or brick around a new frame, painting, new flyscreens and taking away the old windows may or may not be in the price.

Is double glazing worth it in Sydney?

Sydney has milder winters than Melbourne or Canberra, so double glazing is not right for every home. It traps a layer of air or gas between two panes, which slows heat moving through the glass and cuts outside noise.

The NSW Government suggests considering double glazing if you have very hot summers or cold winters, old single-pane, leaky or damaged windows, or noise from traffic, neighbours or planes. It says some homes may save $500 or more a year on heating and cooling, depending on the home. Your own result will vary.

In Sydney, people often choose double glazing for noise, or for comfort in rooms that get hot afternoon sun. If saving energy is your main goal, ask about cheaper options too, such as low-e glass, sealing gaps or better window coverings.

When you compare products, ask for two numbers for the whole window, not just the glass:

• U-value: how easily heat passes through the window. A lower number means it insulates better.
• SHGC (solar heat gain coefficient): how much heat from the sun comes through. A lower number lets in less summer heat.

Many window makers also rate products under the Window Energy Rating Scheme (WERS), which makes quotes easier to compare.

What a double glazing quote should include

A clear quote lists exactly what you are paying for. Look for:

• A window-by-window list with sizes, opening type and location
• “Retrofit” or “full replacement” stated for each window
• The glass type and thickness, and any coating or gas fill
• The frame material and colour, for new windows
• Removal and disposal of the old glass or windows
• Sealing, flashing and making good inside and out
• Flyscreens, locks and handles
• Product warranties and the installer’s workmanship warranty

Items often excluded or listed as extras include “scaffolding or access equipment”, “painting”, “repairs to rotten or damaged frames” and “plaster or render patching”. If it is not written on the quote, ask before you sign.

NSW rules that apply

Licence: in NSW, glazing work worth more than $5,000 in labour and materials (including GST) needs a contractor licence. The NSW Government says glazing work includes installing prefabricated or pre-assembled windows.

Licence check: look up the person or company on the NSW Government’s online licence check (verify.licence.nsw.gov.au). It shows the licence holder’s name, licence categories, expiry date and current status. Make sure the name matches the business on your quote and contract.

Written contract: your tradie must give you a written contract if the job is worth more than $5,000 including GST. Jobs over $20,000 need a more detailed contract, and you get a cooling-off period of five clear business days.

Deposit: the most you can be asked to pay as a deposit is 10 per cent of the contract price.

Home Building Compensation insurance: for work worth more than $20,000, the contractor must take out this insurance before asking you for any deposit or payment. A whole-house double glazing job can easily pass this amount, so ask for the certificate.

Warranties: NSW law gives you statutory warranties on home building work. The period is 6 years for major defects and 2 years for other defects.

Apartments: under NSW strata rules, installing double or triple glazed windows is listed as a minor renovation. You need approval from your owners corporation before work starts. Windows are often common property, so speak to your strata manager early.

Approvals: replacing windows like for like is often exempt development, but only if the work meets the set standards. Changing the size of an opening, or working on a heritage item or in a heritage conservation area, may need approval. Check the NSW Planning Portal or ask your council before you order.

Questions to ask your tradie

• What is your licence number, and which business name will be on the contract?
• Are my frames sound enough for a retrofit, or do some windows need full replacement?
• What are the U-value and SHGC for the whole window you are quoting?
• Does the price include removal, disposal, flyscreens and making good?
• How long will the windows take to make, and how long to install?
• What happens if you find rotten or damaged frames once work starts?
• What warranties come with the glass, the frames and your workmanship?

Get matched with local window and glazing trades

Thinking about double glazing? Describe your job to MyTradeCrew. Tell us how many windows you have, roughly how big they are, the frame type and whether noise, heat or draughts are your main concern. We will match you with vetted, licensed and insured local trades who can measure up and give you a written quote.

Frequently asked questions