Sash windows lend a timeless elegance to any home. Their classic design and functionality make them a popular choice for both traditional and modern properties. However, like any window, sash window glass can become damaged and may require replacement. While the cost depends on a number of factors, this guide will help you understand and budget for getting your sash window glass replaced.

Sash Window Glass Replacement

Factors Affecting the Cost of Sash Window Glass Replacement

Several factors influence the final cost of replacing your sash window glass. These include:

  • Size of the Window: Naturally, larger windows require more glass, resulting in a higher replacement cost.
  • Type of Glass: Different types of glass exist, including standard single-glazed glass, double-glazed glass for improved insulation, toughened glass for safety, and speciality glass options. The more specialised the glass, the higher the cost.
  • Timber Condition: If the timber frame surrounding the glass gets damaged, it might require more repairs, which could increase the total cost of the project.
  • Window Accessibility: Windows on higher floors or difficult to access positions may incur a higher labour charge.
  • Labour Costs: Labour costs vary across Australia and between tradespeople. It’s advisable to get multiple quotes for an accurate comparison.

Estimated Cost Ranges

Here’s a breakdown of possible cost estimations to help you budget, remembering that these are merely guides and may vary:

  • Single Pane Glass Replacement: The most affordable option, single pane glass replacement typically ranges between $70-$250 per window.
  • Double-Glazed Glass Replacement: For superior energy efficiency, consider double-glazed glass. This typically costs somewhere between $300-$800 per window.
  • Timber Window Restoration with Glass Replacement: If your window’s timber frame needs repairs in addition to glass replacement, the total cost could range from $350 -$1000 or more, depending on the extent of the damage.

Tips for Finding the Best Value

  • Get Multiple Quotes: Obtain quotes from at least three reputable glaziers to compare prices and services.
  • Ask About Included Services: Clarify whether quotes include materials, labour, old glass disposal, and any warranties.
  • Check Reviews and Credentials: Research glaziers online, seek recommendations, and ensure they are licensed and insured.
  • Consider Off-Peak Timing: You may be able to secure lower rates by scheduling your replacement outside of peak glazing seasons.

The Importance of Professional Glass Replacement

If you’re the handy sort, you might consider replacing the glass yourself. This can save you on labor costs. However, it’s important to weigh the risks and benefits carefully. Replacing sash window glass, particularly in timber frames, requires specific skills and tools. If done incorrectly, you could damage the frame or injure yourself.

When you hire a professional glazier, they make sure to do the job correctly and safely. It’s better to let professionals handle replacing sash window glass for several reasons:

  • Safety: Handling large panes of glass and working with ageing window frames poses risks when undertaken non-professionally.
  • Correct Sizing and Sealing: Professionals ensure a perfect fit, minimising the potential for water leaks, drafts, and energy inefficiency.
  • Heritage Expertise: When working on period or heritage homes, it’s important to find tradespeople who have expertise in sash windows so they can respect the building’s character while completing the project.
Sash Window Glass Replacement

Additional Considerations

Here are a few more factors to keep in mind when planning your sash window glass replacement:

  • Historic Properties: If you own an older or heritage-listed property, there may be additional regulations or requirements for window glass replacements. These might include matching the original glass style, thickness, or using specific glazing techniques. Consulting with your local council or a heritage specialist is essential to ensure compliance and avoid potential fines or delays. The cost may rise due to sourcing specialised materials or meeting stricter regulations.
  • Energy Efficiency: Investing in double-glazed or even triple-glazed glass significantly improves your home’s insulation. While the initial cost is higher, the reduced energy bills over time can offset this expense. This becomes particularly important in areas with extreme temperatures. Consider the cost savings versus the initial investment over a longer period to determine if the efficiency upgrade is worthwhile for you.
  • Noise Reduction: Along with energy efficiency, thicker or multi-pane glass options can reduce outside noise. This consideration is significant if your home is in a busy urban area or near roads or railways.
  • Timber Frame Maintenance: When doing glass replacement, it’s the perfect time to carefully inspect the timber frame for any signs of wear, rot, or insect damage. Addressing these issues promptly prevents further deterioration. Factor potential repair or restoration costs into your overall budget.
  • Resale Value: New, well-maintained sash windows, especially with energy-efficient glazing, can increase the appeal and value of your home should you ever decide to sell.


Can I replace just the glass in my sash window?

Yes! Unless frame damage necessitates a full sash replacement, professional glass repairers can usually replace the glass pane only.

How long does sash window glass replacement take?

Uncomplicated replacements can often be completed within a few hours. More complex situations may require longer.

Will replacing my sash window glass improve energy efficiency?

If you opt for modern double-glazed glass, your new windows should provide better insulation than older, single-pane options.

While sash window glass replacement has costs involved, knowing what to expect helps with budgeting. This guide outlines the various factors, estimates, and important points to consider. By hiring a skilled professional and following this guide, you can make sure you restore your sash windows to their original charm, improving both the look and functionality of your home.