When upgrading your home, energy efficiency is a key factor to consider. From reducing energy bills to improving indoor comfort, the right materials can make a lasting impact. Double glazed windows are one of the best ways to enhance insulation, reduce noise, and increase the overall value of a home.
Many homeowners, including those considering modular home solutions, often ask: how much does double glazing cost in Australia? While pricing depends on factors like window size, materials, and installation, the long-term energy savings and comfort benefits make it a worthwhile investment.
This guide explores the average cost of double glazed windows, the key factors affecting pricing, and how to get the best value for money.
How Much Does Double Glazing Cost in Australia?
The cost of double glazing depends on various factors, including:
- Type of Glass – Standard double glass window panes are cost-effective, while low-emissivity (Low-E) or acoustic glass is more expensive.
- Frame Material – uPVC is the most affordable, aluminium is lightweight and modern, while timber is premium but requires maintenance.
- Window Style – Sliding, casement, and tilt-and-turn designs impact pricing.
- Labour Costs – Professional installation ensures quality and longevity.
- Energy Ratings – Windows with higher energy ratings may cost more upfront but reduce energy bills over time.
Estimated Costs in Australia
So, how much does double glazing cost? On average, double glazed windows in Australia cost between $10,000 and $20,000 for a full home installation. For both traditional and modular homes, pricing varies based on window size, materials, and installation. However, the long-term energy savings make it a worthwhile upgrade.
Here’s a price breakdown per window:
- uPVC Double Glazed Windows – $500 – $1,000 per window
- Aluminium Double Glazed Windows – $800 – $1,800 per window
- Timber Double Glazed Windows – $1,500 – $3,000 per window
Cost of Replacing Windows in a Three-Bedroom House
For a standard three-bedroom house, replacing single glazed windows with double glazing for windows can cost between $12,000 and $25,000, depending on:
- Number of windows – Most homes have 8 to 12 windows.
- Customisation options – Special coatings, tints, or decorative finishes increase costs.
- Installation complexity – Retrofitting existing windows is cheaper than a full-frame replacement.
How to Finance Your Double Glazing Installation
For many homeowners, double glazing for windows is a major upfront expense, but financing options can make it more accessible.
1. Government Rebates & Incentives
- Victoria’s VEU Programme – Offers rebates for energy-efficient window replacements.
- NSW Energy Savings Scheme (ESS) – Provides financial incentives for double glazing upgrades.
- Check local councils – Some regions offer energy efficiency grants.
2. Interest-Free Finance Plans
- Many double glazing suppliers provide buy now, pay later schemes.
- Spreading the cost over 12-48 months makes upgrading more manageable.
3. Home Improvement Loans
- Banks and credit unions offer low-interest loans for energy-efficient home improvements.
- Compare lenders to find the best repayment terms.
Financing options allow homeowners to enjoy the benefits of double glazing immediately while managing costs more effectively.
Why Double Glazing is a Smart Investment
One of the main reasons homeowners choose double glazed windows is their ability to improve energy efficiency and comfort.
1. Energy Efficiency & Cost Savings
- Reduces heat transfer – The insulating gap between two panes slows heat movement, keeping homes cooler in summer and warmer in winter.
- Lowers energy use – Better insulation reduces reliance on heating and cooling, cutting energy costs.
- Frames improve insulation – uPVC and aluminium frames help retain indoor temperatures.
- Long-term savings – Homes with double glazing can cut heat loss by up to 50%, making them more cost-effective.
2. Noise Reduction & Security
- Soundproofing insulation – The air gap between panes acts as a buffer, absorbing noise.
- Acoustic glass – Ideal for homes in noisy urban areas.
- Stronger security – Multi-point locking systems and toughened glass improve home safety.
3. Increased Property Value
- Energy-efficient homes attract buyers – More homebuyers prioritise sustainable features.
- Enhanced kerb appeal – Modern glazed windows improve home aesthetics.
- High resale value – Real estate experts estimate double glazing can increase home value by 5-10%.
How Does Double Glazing Perform in Extreme Weather?
Australia experiences a wide range of extreme weather conditions, from heatwaves and storms to bushfires and high winds. Many homeowners wonder whether double glazed windows can withstand these conditions and maintain efficiency.
1. Heat Resistance
- Reduces solar heat gain – Double glazing with Low-E glass reflects heat, keeping homes cooler in summer.
- Minimises indoor overheating – The insulating air gap slows heat transfer, preventing excess warmth from entering.
- Ideal for sunny climates – Homes in Queensland, WA, and NT benefit from tinted or UV-protected glass.
2. Storm and High Wind Protection
- Stronger than single glazing – Toughened double glazing is more impact-resistant than single glazed windows.
- Withstands heavy rain & wind – Sealed multi-chamber frames prevent water leaks and draughts.
3. Bushfire Safety
- Bushfire-rated glass – For high-risk areas, BAL-rated glazing meets fire safety standards.
- Tempered or reinforced glass – Offers higher resistance to extreme heat exposure.
With the right glazing and frame selection, double glazing for windows enhances climate resilience while maintaining comfort and safety.
Double Glazed vs. Single Glazed Windows
| Feature | Single Glazed Windows | Double Glazed Windows |
| Glass Layers | 1 pane of glass | 2 panes with an insulating air gap |
| Energy Efficiency | Poor insulation; higher heating & cooling costs | Reduces heat loss by up to 50%, lowering energy bills |
| Noise Reduction | Minimal soundproofing | Absorbs sound waves, reducing noise pollution |
| Security | Easy to break; higher security risk | Stronger, more impact-resistant, especially with toughened glass |
| Cost | Lower upfront cost but higher long-term expenses | Higher initial investment but cost-saving in the long run |
| Best For | Mild climates, heritage-listed homes | Most modern homes, energy-conscious homeowners |
What to Look for When Buying Double Glazed Windows
1. Choosing the Right Frame Material
- uPVC – Affordable, low maintenance, and durable.
- Aluminium – Lightweight, modern, and weather-resistant.
- Timber – Aesthetic appeal but requires maintenance.
2. Noise Reduction Features
- Acoustic glass is ideal for busy areas.
- Quality frame seals prevent sound leakage.
3. Customisation Options
- Different colours, finishes, and tinted or decorative glass.
How Do Different Glazing Thicknesses Affect Performance?
Many homeowners assume all double glazed windows are the same, but glass thickness significantly impacts insulation, noise reduction, and durability.
1. Standard Glass Thickness
- 4mm glass – Standard for most residential double glazing, providing basic insulation.
- 6mm glass – Reduces more noise and improves durability, ideal for urban areas.
- Laminated glass (6.38mm+) – Additional soundproofing and security benefits.
2. Gas-Filled Gaps for Enhanced Insulation
- Some double glazed units contain argon or krypton gas, improving thermal efficiency.
- Gas-filled windows help reduce energy bills by preventing heat loss in winter and heat gain in summer.
3. Do Australians Need Triple Glazing?
- Triple glazing is common in cold climates like Europe, but not always necessary in Australia.
- Higher cost vs. benefit – In most cases, high-quality double glazing offers sufficient insulation.
Choosing the right glazing thickness ensures better performance based on climate, noise concerns, and energy efficiency goals.
Can Double Glazing Help Reduce Condensation and Mould?
Many Australian homes suffer from condensation buildup, leading to mould growth and window damage. Double glazing significantly reduces this issue.
Why Single Glazed Windows Cause Condensation
- Temperature difference – When warm indoor air meets cold external glass, moisture condenses.
- Poor insulation – Single glazed windows allow rapid heat loss, increasing condensation risk.
How Double Glazing Prevents Condensation
- The insulating air gap between glass panes maintains indoor temperatures, reducing condensation formation.
- Frames with thermal breaks help prevent internal moisture buildup.
Additional Tips for Preventing Mould
- Use extractor fans in bathrooms and kitchens.
- Open windows periodically for ventilation.
- Invest in dehumidifiers to control indoor humidity.
By reducing condensation, double glazing for windows helps maintain indoor air quality and window longevity.
How to Choose the Right Double Glazing Supplier
Not all double glazing suppliers offer the same quality, warranty, or installation service. Here’s what to look for when choosing a supplier:
1. Check Their Reputation
- Look at verified customer reviews and industry ratings.
- Ensure they have experience in installing double glazed windows in Australia.
2. Look for Warranty & Energy Certifications
- A reputable supplier will provide a 10-20 year warranty on glass and frames.
- Ensure their products meet Australian energy efficiency standards.
3. Watch Out for Red Flags
- No warranty coverage
- Unlicensed installers
- Unrealistic cost-saving promises
Does Double Glazing Work for Every Home?
While double glazing for windows is a great choice for most homes, some properties may have installation challenges.
1. Retrofitting vs Full-Frame Replacement
- Retrofitting – Keeps existing frames while adding double glazing.
- Full-frame replacement – Best for damaged or old windows.
2. Considerations for Older or Heritage Homes
- Some heritage-listed buildings have window restrictions.
- Custom double glazing solutions may be required.
What Are the Alternatives to Double Glazing?
If double glazing is out of budget or not feasible, homeowners can consider:
- Secondary glazing – A removable acrylic or glass panel placed over existing windows.
- Window films – Reflective coatings reduce solar heat gain.
- Draught-proofing – Sealing gaps to prevent heat loss.
- Thermal curtains – Thick, insulated curtains help retain warmth.
While these options provide some insulation, double glazing remains the most effective long-term solution.
Getting the Best Deal on Double Glazed Windows
When researching how much does double glazing cost, it’s also important to know how to get the best deal. To maximise your investment:
- Compare multiple suppliers – Request at least three quotes before deciding.
- Understand warranty coverage – A reputable provider offers guarantees on glass and frames.
- Prioritise professional installation – Poor fitting reduces efficiency.
- Assess long-term savings – While replacement windows prices may seem high, energy savings help offset costs.
Conclusion
If you are still wondering how much does double glazing cost, the answer depends on the window type, the material, and installation requirements. However, the long-term benefits of insulation, noise reduction, and energy savings make it a valuable investment for Australian homeowners.
At Portalux, we specialise in energy-efficient and sustainable home solutions. Our modular home designs incorporate high-performance features like double glazing, helping you lower energy costs while enhancing comfort. Contact us today to explore modern, stylish living solutions designed for Australian homes.