Looking to upgrade your home with double glazed windows but unsure about the costs involved? Double glazing is a significant investment that can enhance your home’s comfort, energy efficiency, and value. This comprehensive guide breaks down the real costs of double glazed windows in Australia for 2024, helping you budget effectively and find the best value for your renovation project.
What Are Double Glazed Windows?
Double glazed windows consist of two panes of glass with a sealed gap between them. This space is often filled with argon gas or left as a vacuum, creating an insulating barrier that significantly improves thermal and acoustic performance compared to single-pane windows.
Key Components:
- Two panes of glass (4-10mm thickness each)
- Spacer bar (creates the gap between panes)
- Sealed air or gas-filled cavity (typically 6-20mm)
- Desiccant material (prevents moisture buildup)
- Frame (uPVC, aluminum, or timber)
Key Factors Influencing Double Glazed Windows Cost
The price of double glazed windows can vary significantly based on several factors. Understanding these variables will help you budget more accurately for your project.
Frame Material
| Frame Material | Cost Range (per m²) | Pros | Cons |
| uPVC | $300 – $500 | Excellent insulation, low maintenance, affordable | Limited color options, less structural strength |
| Aluminum | $300 – $1,250 | Durable, slim profiles, modern appearance | Less thermally efficient, can conduct heat/cold |
| Timber | $600 – $1,500 | Natural insulation, premium aesthetic, heritage appeal | Requires maintenance, highest cost option |
Window Size and Configuration
Larger windows require more materials and are more complex to install, increasing costs. Standard sizes are more affordable than custom dimensions.
Common Window Styles:
- Fixed (non-opening) – Most affordable
- Sliding – Mid-range pricing
- Casement (side-hinged) – Mid to high range
- Tilt and turn – Premium pricing
- Bay or bow windows – Highest cost
Size Impact:
- Small windows (under 0.5m²): $150-$400 each
- Medium windows (0.5-1m²): $400-$800 each
- Large windows (1-2m²): $800-$1,500 each
- Extra large (over 2m²): $1,500+ each
Glass Type and Specifications
The type of glass used significantly impacts both performance and cost. Specialized glass options add to the base price but may provide better long-term value.
| Glass Type | Additional Cost | Benefits |
| Standard clear | Base price | Basic thermal and acoustic insulation |
| Low-E (low emissivity) | +15-20% | Enhanced thermal efficiency, blocks UV rays |
| Acoustic laminated | +25-35% | Superior noise reduction, added security |
| Toughened safety | +15-25% | Increased durability and safety |
| Self-cleaning | +20-30% | Reduced maintenance, stays clearer longer |
Installation Complexity
Installation costs typically range from $60-$90 per hour per glazier. Several factors can increase installation complexity and cost:
- Difficult access (multi-story buildings)
- Structural modifications required
- Removal of existing windows
- Heritage property considerations
- Custom sizing or unusual shapes
Price Ranges for Different Double Glazing Options
Standard Double Glazing
Standard double glazing with basic clear glass and standard frames is the most common and affordable option.
| Window Type | Size (mm) | uPVC Frame | Aluminum Frame | Timber Frame |
| Fixed | 600 x 900 | $350-$450 | $400-$550 | $600-$750 |
| Casement | 600 x 900 | $450-$550 | $500-$650 | $700-$850 |
| Sliding | 1200 x 1200 | $600-$800 | $650-$900 | $900-$1,200 |
Acoustic Double Glazing
Acoustic double glazing uses specialized laminated glass and wider air gaps to maximize noise reduction, ideal for homes near busy roads or in urban areas.
Expect to pay a 25-35% premium over standard double glazing for acoustic performance. For example, a standard window costing $600 would cost $750-$810 with acoustic glass.
Energy-Efficient Double Glazing
Energy-efficient options incorporate Low-E glass, gas filling, and thermal spacers to maximize insulation properties.
Energy-efficient upgrades typically add 15-25% to standard costs but can reduce energy bills by 10-20% annually. The payback period is usually 5-7 years in moderate climates.
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Cost Comparison: Single vs. Double vs. Triple Glazing
Understanding how double glazing costs compare to alternatives helps put the investment in perspective.
| Feature | Single Glazing | Double Glazing | Triple Glazing |
| Average cost (per m²) | $150-$400 | $300-$1,500 | $600-$2,000 |
| Thermal efficiency (U-value) | 5.8-6.8 W/m²K | 2.8-3.5 W/m²K | 1.8-2.2 W/m²K |
| Noise reduction | Low (25-30dB) | Medium (35-45dB) | High (40-50dB) |
| Energy bill savings | Baseline | 10-20% | 15-25% |
| Typical ROI period | N/A | 5-7 years | 8-12 years |
Double Glazing Advantages
- Excellent balance of performance and cost
- Significant energy savings over single glazing
- Good noise reduction capabilities
- Widely available with many options
- Reasonable payback period
Double Glazing Limitations
- Higher initial cost than single glazing
- Less thermally efficient than triple glazing
- May not meet highest energy standards
- Installation can be disruptive
- Not always suitable for heritage properties
Hidden Costs to Consider
Beyond the basic window and installation costs, several additional expenses may impact your budget.
Frame Repairs and Structural Modifications
Existing window openings may require modifications to accommodate new double glazed units, especially in older homes.
- Timber frame repairs: $200-$500 per window
- Lintel replacement: $300-$800 per window
- Wall modifications: $400-$1,200 depending on complexity
- Rendering and finishing: $150-$300 per window
Building Regulations and Permits
Depending on your location and the scope of work, you may need to comply with building regulations and obtain permits.
- Energy efficiency compliance assessment: $150-$400
- Building permits (if required): $200-$1,000
- Heritage property approvals (if applicable): $300-$800
Warranties and Insurance
Quality warranties provide peace of mind but may add to the upfront cost.
- Extended warranties: 5-10% of window cost
- Installation guarantees: Often included but check terms
- Insurance coverage during installation: Verify with your home insurer
Pro Tip: Always Get a Comprehensive Quote
Request detailed quotes that include all potential costs—not just the windows themselves. Ask specifically about any additional work that might be required once old windows are removed.
Regional Price Variations in Australia
Double glazed window costs can vary significantly across different Australian regions due to factors like climate requirements, labor costs, and market competition.
| Region | Average Cost Range (per m²) | Key Factors |
| Melbourne & Victoria | $500-$1,200 | High demand due to cold winters, competitive market |
| Sydney & NSW | $600-$1,300 | Higher labor costs, growing energy efficiency awareness |
| Brisbane & QLD | $450-$1,100 | Focus on heat rejection properties, less market penetration |
| Perth & WA | $550-$1,250 | Higher shipping costs for materials, extreme temperature variations |
| Adelaide & SA | $500-$1,150 | Growing market, increasing energy efficiency requirements |
| Hobart & TAS | $550-$1,300 | High demand for thermal efficiency, smaller market |
Real-World Pricing Examples
Small Home (3 bedrooms)
- 8 windows total (mix of sizes)
- uPVC frames with standard double glazing
- Total cost: $8,000-$12,000
- Installation time: 1-2 days
Medium Home (4 bedrooms)
- 12 windows total (various styles)
- Aluminum frames with Low-E glass
- Total cost: $15,000-$22,000
- Installation time: 2-3 days
Large Home (5+ bedrooms)
- 18+ windows and glass doors
- Timber frames with acoustic glass
- Total cost: $25,000-$40,000+
- Installation time: 3-5 days
5 Money-Saving Tips for Double Glazing Buyers
Smart planning and research can help you maximize value and minimize costs when investing in double glazed windows.
1. Consider Retrofit Options
Secondary glazing (adding a second pane to existing windows) costs 50-60% less than full replacement, ranging from $500-$600 per m² compared to $1,200-$1,500 for new windows.
This option works well for heritage properties or when existing frames are in good condition.
2. Choose Standard Sizes
Custom-sized windows can cost 20-40% more than standard dimensions. Work with standard sizes where possible, especially for non-feature windows.
Common sizes include 600x900mm, 1200x1200mm, and 1800x1200mm.
3. Prioritize Key Rooms
If budget is limited, install double glazing in the most important areas first: bedrooms for noise reduction, living areas for comfort, and south/west-facing rooms for thermal efficiency.
You can upgrade remaining windows in stages as budget allows.
4. Compare Multiple Quotes
Prices can vary by 15-30% between companies for the same specifications. Always get at least 3 quotes and be sure they include all costs—not just the windows themselves.
Use detailed specifications when requesting quotes to ensure you’re comparing like-for-like.
5. Look for Package Deals
Many companies offer significant discounts (10-20%) for whole-house installations. Even replacing 5+ windows at once can qualify for bulk pricing.
Ask about seasonal promotions, end-of-financial-year sales, and energy efficiency rebates that may be available.
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Financing Your Double Glazed Windows
If you’re not paying cash upfront, several financing options can help make double glazing more affordable.
Home Loan Redraw
If you’re ahead on your mortgage payments, you may be able to access funds through your redraw facility or offset account. This is often the cheapest option with interest rates typically between 3-5%.
Green Loans
Some lenders offer special “green loans” for energy-efficient home improvements at reduced interest rates (often 1-2% lower than standard personal loans). Double glazing typically qualifies for these programs.
Payment Plans
Many window companies offer interest-free payment plans for 12-24 months. Be sure to check for hidden fees and what happens if you don’t pay within the interest-free period.
“We financed our double glazing through a green loan at 4.5% interest. The monthly energy savings almost covered the loan repayments, making it effectively cost-neutral from day one.”
— Sarah T., Melbourne homeowner
Frequently Asked Questions
Is double glazing worth the investment long-term?
Yes, double glazing typically offers good return on investment through energy savings (10-20% on heating/cooling bills), increased property value (3-5%), improved comfort, and noise reduction. Most homeowners recoup costs within 5-7 years through energy savings alone, while enjoying the benefits immediately.
How long do double glazed windows last?
Quality double glazed windows typically last 20-30 years before the seals begin to deteriorate. The frames may last even longer depending on the material: uPVC (20-30 years), aluminum (30-40 years), and well-maintained timber (50+ years with proper care).
Can I install double glazed windows myself?
DIY installation is not recommended for most homeowners. Professional installation ensures proper sealing, structural integrity, and warranty validity. Improper installation can lead to air leaks, water damage, and reduced performance. However, some secondary glazing kits are designed for DIY installation if you’re experienced with home improvements.
How much can I save on energy bills with double glazing?
Most Australian homeowners save 10-20% on heating and cooling costs after installing double glazed windows. The exact savings depend on your climate, previous window efficiency, home insulation, and energy usage patterns. Homes in extreme climates (very hot or cold regions) typically see the highest savings.
Are there any government rebates available for double glazing?
Some states offer rebates or incentives for energy-efficient home improvements, including double glazing. Check with your local energy authority or visit energy.gov.au for current programs. Additionally, some local councils offer sustainability rebates that may apply to window upgrades.
Making the Right Double Glazing Investment
Double glazed windows represent a significant investment in your home’s comfort, efficiency, and value. While costs typically range from $300 to $1,500 per square meter depending on materials and specifications, the long-term benefits often justify the expense.
By understanding the factors that influence pricing and using the money-saving strategies outlined in this guide, you can make informed decisions that balance upfront costs with long-term value. Remember that quality installation is just as important as the windows themselves for maximizing performance and longevity.
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