What to Consider Before Replacing Your Windows and Doors
Replacing windows and doors in your home or commercial property is a significant investment. Whether you’re upgrading for energy efficiency, improving security, or simply updating the look of your building, it’s important to make informed decisions. At iWindow Glazing, we work with Sydney homeowners, builders, and strata to ensure each glazing project is tailored to their unique needs. Here are the key factors to consider before replacing your windows and doors.
Table of Contents
Purpose of the Replacement
Energy efficiency
Are your current windows letting in too much heat or cold? Upgrading to energy-efficient glazing systems can reduce your energy bills and make your home more comfortable year-round.
Noise reduction
If you live near a busy road or noisy neighbourhood, acoustic glazing or double-glazed units can help block out sound.
Aesthetic improvement
New windows and doors can dramatically change the look of your property. You can modernise your facade or restore its heritage charm with the right design.
Security
Modern glazing and locking systems offer much better protection than older installations.
Frame Material Selection
In Sydney, aluminum is the most common and preferred framing option due to its durability and minimal maintenance needs.
Aluminum
A top choice for Sydney homes due to its strength, sleek design, and resistance to corrosion—ideal for coastal conditions. Aluminum frames are lightweight yet incredibly durable, offering a clean, modern look with narrow sightlines that maximise glass area and natural light. They require very little maintenance and don’t warp or swell like timber. Aluminum is also recyclable and environmentally friendly. At iWindow, we use trusted suppliers like Alspec for premium aluminum framing systems that are available in a wide range of powder-coated finishes such as Monument, Jasper, and Surfmist.
Glass Type
Glass selection impacts energy efficiency, safety, and comfort.
Single glazing
Suitable for interior use or non-critical areas.
Double glazing
Essential for thermal insulation and soundproofing.
Low-E glass
Reflects heat back to its source, reducing solar gain.
Laminated or toughened glass
Enhances safety and security.
Acoustic glass
Ideal for homes near airports, railways, or busy roads.
We recommend glass products from Viridian Glass and AGG, both well-known and certified Australian suppliers.
Building Codes & Energy Ratings
In NSW, BASIX (Building Sustainability Index) requirements apply to most residential renovations and new builds. Your glazing must comply with:
U-Value
Measures thermal performance.
SHGC (Solar Heat Gain Coefficient)
Measures how much solar radiation passes through the glass.
If you’re working with an architect or builder, ask for a BASIX Report or a NatHERS Certificate. These will guide you in choosing compliant windows and doors.
Installation Quality
High-quality products are only as good as their installation. Poor fitting can lead to:
- Air leaks
- Water penetration
- Reduced lifespan of the frame or seals
At iWindow Glazing, we are licensed contractors in NSW, and our experienced team handles the entire installation process. We also provide certification for council or strata requirements.
Warranties and Certification
- Our aluminum products come with a warranty.
- Powder coating finishes (like Jasper or Monument) are backed by Dulux or Interpon warranties.
- Installation is certified and backed by insurance including public liability.
Budget & Timeline
Have a clear idea of your budget. Aluminum glazing systems offer flexibility in terms of configuration and cost, from basic sliding windows to custom-designed double-glazed doors.
Also, timelines vary depending on:
- Custom vs standard sizing
- Availability of chosen glass or frame colour
- Access to the site and preparation needs
We work with you to plan around your timeframe, whether it’s a quick replacement or part of a larger renovation.
Strata and Council Requirements
If you’re in a unit or apartment, consult your strata committee first. Often, written approval is needed for changing windows and doors. We can assist you with providing specifications and even help you get a second quote if needed.
Optimizing Ventilation and Natural Light
Ensure your replacements allow proper airflow and light entry. North-facing windows can reduce heating costs in winter, while operable windows improve air quality.
Environmental Considerations
Aluminum is recyclable and energy-efficient glazing reduces energy consumption. Combine both to reduce your home’s carbon footprint.
Conclusion: Choose Smart, Replace Right
Window and door replacements are an investment that pays off in comfort, performance, and property value. Contact iWindow Glazing to explore premium solutions that meet Sydney’s standards for climate, aesthetics, and lifestyle.
