Window Replacement Cost: A Complete Guide

Replacing old or damaged windows can improve your home's comfort, energy efficiency, and market value. But how much does window replacement cost in Australia? This guide explains the key factors that influence the price, compares window types and materials, and helps you budget effectively. Whether you are upgrading for aesthetic reasons or functional improvements, this article will help you understand the complete cost of replacing windows in Australia.

What Is the Average Cost of Window Replacement in Australia?

The cost of replacing windows in Australia varies significantly depending on the type of window, material used, size, and complexity of installation. On average:

• Basic single-pane window replacement may cost between $150 and $400
• Double glazed window replacements generally start from $500 and can exceed $1,500 per window
• Custom windows or large architectural styles may cost up to $2,000 each, as custom windows are typically more expensive than standard-size windows due to extra manufacturing costs
• Replacing multiple windows can bring discounts, reducing the average price per window

A full house window replacement for a standard 3-bedroom home usually ranges between $18,000 and $32,000, depending on the quantity and quality of windows chosen. This is based on single glazing with flyscreens but an upgrade to double glazing and security screens will increase this range.

Key Factors That Influence Window Replacement Cost

1. Type and Size of Window

The most significant factor in determining your final cost is the window type. Fixed-pane windows, which cannot be opened or shut, are cheaper, while bi-fold or bay windows are more expensive due to their size and design.

Common types include:

• Casement windows: hinged at the side or top, popular for ventilation
• Double-hung and single-hung: feature vertical sliding sashes
• Tilt and turn windows: open in two directions for easy cleaning and airflow
• Sash windows: feature two panels sliding over each other
• Hopper windows: hinged at the top and open inward
• Bi-fold windows: fold accordion-style and cost significantly more
• Louvre windows: consist of slats that control airflow
• Bay windows: create extra space and light by coming out at an angle from the walls of a house
• Awning windows: a top-hinged window that opens outward, creating a canopy-like effect

2. Window Frame Material

Window frame materials significantly impact both the replacement cost and long-term performance:

• uPVC: lightweight, low cost, energy efficient, requires less maintenance, and is a strong alternative to painted timber finishings
• Timber: provides natural appeal but needs regular upkeep
• Aluminium: sleek and durable with modern appeal but slightly higher in price
• Composite: combines materials for better performance but can be an expensive option

3. Glazing and Energy Efficiency

Double glazed and triple glazed windows cost more than single pane windows but offer long-term savings due to improved energy efficiency. Double glazed windows retain heat and reduce outside noise, making them ideal for Australian homes.

Energy efficient windows can reduce heating and cooling costs significantly and add value to your property. While they have a higher upfront price, they align with eco-friendly home renovations and contribute to long-term savings.

4. Number of Windows Being Replaced

Most window installers offer bulk discounts for replacing multiple windows in one project. Replacing windows across the whole house reduces labour costs and may come with package deals.

5. Accessibility and Installation Complexity

Installation costs increase if scaffolding is required for upper levels or if access to the window is restricted. Custom windows, changes in opening mechanism, or the need to replace damaged frames also add to labour costs. Proper weather-proofing is essential during window installation to prevent future issues.

Retrofit installations, where the frame remains and only the glass is changed, are cheaper than full-frame replacements. Full-frame installations may require more extensive work than retrofit installations.

Window Replacement Costs by Type (Estimated per Window)

Window Type

Average Cost (AUD)

Single Hung

$300 to $750

Double Hung

$450 to $900

Casement

$400 to $1,000

Fixed-Pane

$150 to $500

Sliding

$350 to $850

Tilt and Turn

$600 to $1,200

Bi-fold

$1,000 to $2,000+

Bay Window

$1,500 to $3,000

Louvre

$350 to $750

Hopper

$250 to $600

These prices include supply and standard installation but can vary depending on region, material choice, and accessibility.

Glass Types and Their Impact on Pricing

The type of glass used is another major factor in the window replacement quote:

• Single pane glass: Least expensive but thermally inefficient
• Double glazed: Provides good insulation and energy efficiency
• Triple glazed: Offers the highest insulation value and cost
• Low-e glass: Has a reflective coating that improves thermal performance
• Tempered glass: Safety glass that is more resistant to breaking
• Laminated glass: Contains a film to prevent shattering on impact

Double glazed windows generally cost 25 to 50 percent more than single pane windows. However, their energy efficiency makes them a cost effective investment in the long term.

Window Frame Styles and Replacement Costs

Choosing a frame style affects aesthetics and budget. Replacing timber frames with aluminium is common in modern Australian homes. The cost of replacing window frames varies depending on material, paint, and sealing methods. Replacing aluminium window frames in Melbourne, Sydney, or Perth may cost between $250 and $750 per frame.

Old windows with damaged frames require full replacement. Custom made frames cost more but can be necessary to fit non-standard openings.

Labour Costs and Installation Considerations

Installation costs can account for 30 to 50 percent of the total replacement cost. Factors that increase labour costs include:

• Second storey access requiring scaffolding
• Tight or limited space around window frames
• Removing old window frames
• Replacing or reinforcing damaged walls or structural supports

A professional glazier or installer will evaluate your site and provide a tailored quote based on these factors. Providing accurate measurements upfront ensures your window replacement quote reflects the true final price.

Energy Efficiency and Cost Savings

Energy efficient windows are not just a buzzword. They significantly impact your power bills. While uPVC double glazed windows may cost more initially, their insulation capabilities lower long-term energy expenses.

Triple glazed windows offer the highest performance but are less common in Australia due to the milder climate. Still, in colder regions or homes with higher energy usage, they can be worth the higher price tag.

Government incentives for eco-friendly renovations may help offset the cost of installing energy efficient windows. Always check current rebates available in your state.

Maintenance and Long-Term Value

Modern window materials like uPVC and aluminium require minimal maintenance. Timber frames need regular painting or sealing, especially in coastal regions. Replacing old windows with new energy efficient models improves insulation and reduces ongoing costs.

Over time, the savings from better insulation and less maintenance contribute to the total value gained from window replacement. High quality materials ensure better durability and less frequent need for repairs.

DIY vs Professional Installation

DIY installation may save on upfront costs but comes with risks. Improper sealing or poor fit can cause air leaks, water ingress, and long-term property damage. If you have the necessary skills and tools, retrofitting standard windows may be feasible.

However, for full-frame installations or complex designs, hiring professionals ensures safety, compliance with building codes, and proper installation. A qualified window installer or glazier will help avoid costly mistakes and offer warranties on workmanship.

How to Get a Window Replacement Quote

When sourcing quotes, ask for the following details:

• Price per window including installation
• Frame and glass materials
• Labour costs and any access issues
• Timeframe for project completion
• Warranty information
• Disposal of old windows and materials

Providing window measurements and photos of existing windows will help you receive an accurate window replacement quote. Some companies also offer online cost calculators to help you estimate the average price before getting in touch. Planning ahead and preparing the area can save time and costs during installation.

Home Renovation Considerations

Window replacement is often part of broader home renovations. Choosing to replace windows during other upgrades such as exterior painting or insulation retrofits can help reduce total labour costs.

Windows improve both air circulation and natural light, enhancing the comfort and aesthetic appeal of your home. New windows can also boost your property's marketability, helping you secure a higher resale value. Renovating can provide a competitive edge to your property in a saturated market.

Investing in quality windows is a smart way to add value, especially in competitive real estate markets.

Window Replacement Cost Summary

Project Type

Estimated Cost Range (AUD)

Replace single window (standard)

$300 to $1,200

Replace multiple windows (3-bed house)

$4,500 to $15,000

Window frame replacement only

$250 to $750 per frame

Double glazed window (per unit)

$500 to $1,500+

Full-frame custom window

$800 to $2,000+

Retrofit double glazing

$350 to $850 per window

Labour costs (per window)

$150 to $500

Final Thoughts

Replacing your windows can be a major investment but offers long-lasting benefits. From improved energy efficiency to reduced maintenance and better resale value, the cost of window replacement is justified when quality materials and professional installation are used.

“New windows do more than improve how your home looks—they transform how it feels to live in. At Cullen & Co, we make sure every window is installed to last, both in style and performance.” – Anthony Cullen, Director at Cullen & Co

Use this guide to better understand the many factors that influence your window replacement cost and to request quotes that align with your home, style preferences, and budget. Whether you are replacing a single broken window or renovating an entire property, planning ahead and comparing quotes from experienced installers will help you save big and avoid unexpected costs.