Investing in double glazing is a smart decision for homeowners looking to reduce noise, improve thermal comfort and energy efficiency. However, there are various types of double-glazed windows in the market and choosing the right product requires careful consideration.

Before making a purchase, it’s important to gather the right information to ask the right questions to ensure you’re getting a high-quality, long-lasting solution that meets your needs. We’ll cover the key questions to ask when buying double glazing, helping you make an informed choice.

What to Ask When Buying Double Glazing?


  1. What Type of Double Glazing Do You Offer? 

Not all double-glazing systems are the same, so understanding the available options is important. Ask about:

  • Standard Double Glazing – Two panes of glass on the same frame separated by a narrow air cavity or a gas-filled space between them.
  • Low-E (Low Emissivity) Glass – Has a special coating on the glass panel to improve thermal insulation.
  • Laminated or Acoustic Glass – Designed for enhanced noise reduction.
  • Retrofit Double Glazing – A system that converts existing windows into a double-glazed system without full replacement.

If you want to keep your current windows while improving insulation and soundproofing, retrofit double glazing could be a cost-effective alternative to full window replacement.

  1. What Type of Frame Materials Are Available?

The frame material impacts durability, insulation performance, and maintenance requirements. Ask about the pros and cons of different frame types:

Frame Material

Pros

Cons

uPVC

Energy-efficient, low maintenance and cost-effective.

Can discolour over time in harsh climates.

Aluminium

Strong, lightweight and modern-looking.

Conducts heat unless thermally broken.

Timber

Provides excellent insulation and classic aesthetics.

Requires regular maintenance and can be expensive.

If you are considering retrofitting double glazing, ensure the existing window frame is in good condition and suitable for the upgrade.

  1. How Effective Is the Noise Reduction?

If you live near traffic, construction sites or noisy neighbours, noise reduction may be a top priority. Ask about:

  • How much noise reduction can I expect? (Some systems reduce external noise by up to 70%.)
  • What type of glass is best for soundproofing? (Acoustic laminated glass performs best)
  • Will retrofitting double glazing suit better in a certain situation? (For strata or heritage buildings, retrofitting double glazing is ideal as no changes are required to the exterior of the building)

Ensure that the system is tested for soundproofing performance before making a decision.

  1. How Energy Efficient Is Double Glazing?

Other advantages to double glazing include its ability to improve thermal insulation and reduce energy consumption. Ask about:

  • What is the U-value of the windows? (A lower U-value means better insulation)
  • Is the air cavity filled with argon or krypton gas? (These gases are used to enhance energy efficiency in traditional double glazing)
  • Does the system include Low-E coatings glass? (This helps reflect extreme heat)

Energy-efficient double glazing can help keep your home cooler in summer and warmer in winter, minimising the use of heating and cooling systems.

  1. What Are the Warranty and After-Sales Services?

A reasonable warranty period is a sign of a high-quality product. Ask the provider:

  • What is the warranty period? (A minimum of 6 years is the requirement from the Australian Glass and Window Association)
  • What does the warranty cover? (Generally, glass, frames, seals, and installation should all be included)
  • Do you provide after-sales support? (This is important for maintenance and repairs)

Ensuring strong after-sales service can give you peace of mind for years to come.

  1. What Is the Installation Process Like?

A professional installation is key to getting the most out of your double glazing. Poorly installed windows can cause air leaks, condensation issues and reduced insulation performance. Ask about:

  • How long will the installation take?
  • Will there be any mess or disruption?
  • Do I need to prepare anything before installation?
  • Are the installation team contractors or in-house and are they experienced/trained?

For those considering retrofitting double glazing, the installation process tends to be quicker and less disruptive as no hassle of replacement window.

  1. What Is the Total Cost?

Understanding the full cost breakdown is essential to avoid hidden charges. Things to find out:

  • Whether the quote includes installation or labour?
  • A cost comparison between full window replacement and retrofit double glazing.
  • Financing options or government rebates for energy-efficient upgrades.

While cheaper options may seem attractive, investing in high-quality double glazing ensures better performance and durability in the long run.

  1. Can Double Glazing Help With Condensation?

Condensation on windows can lead to mould growth and damage to furnishings. If you experience condensation, here are things to find out:

  • Does this system help reduce condensation?
  • Will I need additional ventilation measures?

Double glazing with proper seals and insulation can help to minimise condensation issues.

  1. Is the Double-Glazing System Environmentally Friendly?

Sustainability is an important consideration. Ask:

  • Are the materials recyclable?
  • Do you have an energy efficiency rating?
  • Do you offer eco-friendly options like Low-E glass?
  1. What Makes Your Double Glazing Different?

Finally, find out why you should choose this company over competitors. Look for:

  • Independently tested and certified products.
  • Proven customer reviews and case studies.
  • Customisation options to fit your needs.

Why Choose Magnetite for Your Double-Glazing Needs?

If you’re searching for high-quality double glazing solutions, Magnetite provides:

  • Retrofit double glazing, transforming your existing windows into a double-glazed system without having to replace your window or door.
  • Up to 70% noise reduction through the windows or doors, perfect for homes in high-traffic or urban areas.
  • Energy-efficient solutions to reduce power bills and maintain indoor comfort.
  • Custom glazing options, tailored to suit your specific needs.
  • Over 25 years of experience in the window industry, installation is delivered by our in-house team of trained installers, and it comes with a 7-year warranty on the workmanship.
  • Free window assessments and quotes, with our experts visiting your home to assess your existing windows and recommend the best solution to suit your requirements.

Choosing the right double glazing will not only improve your home’s comfort and reduce energy costs but also enhance the long-term value of your property.

Asking the right questions before purchasing double glazing ensures you get a high-performance system that suits your needs. By considering factors such as noise reduction, energy efficiency, frame materials and installation quality, you can make a confident and informed decision.

Whether you’re retrofitting double glazing or considering a full replacement, making the right choice today will provide lasting benefits for years to come.

Interested in learning more? Get a free consultation with Magnetite today.

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Magnetite Australia

Magnetite Australia is specialises in providing acoustic and thermal insulation for existing windows and doors. Our double glazing systems have been independently tested by the National Acoustic Laboratories and the Window Energy Rating Scheme (WERS) in line with National Fenestration Rating Council (NFRC) regulations.

Our Products

Soundtite
A secondary aluminium system that is specially designed to reduce noise through an existing sliding window or sliding door. The system can be designed to slide horizontally or vertically to match the existing aluminium window function and design.
Solartite
Solartite works in conjunction with Magnetite, providing a solution for existing glazing that require a reduction in radiant heat. Applied to the inside layer of the existing glass, Solartite will reflect the heat before it enters the air cavity created by Magnetite, delivering maximum performance.
Sealtite
A range of acoustic and weather seals that will improve the insulation in your home or office. This solution enhances the performance of existing windows and doors by applying suitable draught-proofing strips that is appropriate for the window or door style, retaining easy operation.
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