If you’ve been researching ways to improve your home’s comfort and energy efficiency, you’ve likely come across the term retrofit double glazing. But what does retrofit really mean? And why does the quality of the retrofit matter so much?
At Sealasash, we specialise in retrofit double glazing in Melbourne and Tasmania, helping homeowners keep the character of their original timber windows while enjoying modern comfort. But not all retrofits are created equal — and that’s where many homeowners get caught out.
What is Retrofit Double Glazing?
Retrofit simply means upgrading your existing windows to improve their performance rather than replacing them entirely. In the case of retrofit double glazing, it involves removing the old glass from your timber window frames and installing modern insulated glass units (IGUs).
When done properly (this means including draught sealing), this process keeps your original timber frames, retains the heritage charm, and significantly improves your home’s:
- Energy efficiency – better insulation against heat loss and gain.
- Acoustic performance – reduced outside noise.
- Sustainability – avoiding landfill from perfectly good timber frames.
For a deeper dive into why retaining your original frames can be better than replacing them, see our article: When Old Windows Are Better Than New Windows.
The Hidden Dangers of Bad Retrofit Work
Unfortunately, not every company offering “retrofit double glazing” delivers the level of quality your home deserves. In fact, as we outline in The Hidden Sins of Retrofit Double Glazing, there are some common shortcuts and mistakes to watch out for:
- No draught sealing or poor draught sealing
Without proper draught sealing, cold air and noise can still enter, undermining your investment. (Read more about draught proofing best practice – Historic England) - Skipping repairs
Some retrofitting companies ignore rotten timber or loose joints, leaving your windows structurally compromised. - Poor or missing caulking
Some retrofitters skip the finishing step! - No primed beads
Unprimed beads leave new timber exposed to the elements, shortening its lifespan. - Cheap materials
Using inferior repair products or mismatched timbers (softwood against hardwood) leads to premature failure and visible inconsistencies. - Low-quality glass or suppliers
Some companies cut costs not only with poor-quality glass units from questionable sources but also with low performance indexes. (Read more about how to understand performance)
It’s a minefield out there, which is why homeowners need to be aware before signing on the dotted line as the devil is in the detail.
Using Premium Glass that performs properly.
Glass quality can make or break a retrofit. That’s why Sealasash partners with trusted suppliers and offers cutting-edge options like Panasonic Glavenir, a revolutionary vacuum-insulated glass.
Glavenir delivers incredible thermal and acoustic performance in a panel as thin as single glazing its perfect for wooden window frames where space is limited. When paired with our detailed repair and sealing process, Glavenir allows you to retain your beautiful old timber windows while enjoying modern comfort levels that rival or surpass new windows.
For more on vacuum glass and wooden windows, see: How Vacuum Glass Lets You Keep Your Old Window Frames.
Why Sealasash Gets Retrofit Right
We believe in doing things once — and doing them properly. Our process includes:
- Full inspection and repair of frames before glazing.
- Premium draught sealing for both comfort and efficiency.
- We do the 1% stuff, like caulking the windows in which many retrofit companies won’t do.
- Use of primed beads and matching timbers to maintain both function and aesthetics.
- Glass from trusted suppliers, including Panasonic Glavenir for premium performance.
And here’s why Sealasash is the right choice for your retrofit project: before we ever began retrofitting glass into windows, we specialised in draught sealing — and that’s the first, most important upgrade any old timber window needs before you spend money on glass. It’s the foundation of comfort and energy efficiency. (Read why the simple stuff works).
Retrofit vs Replacement: Which is Better for Your Home?
Many homeowners are told replacement is the only option, but often, your existing windows can be upgraded to perform just as well — if not better — than a new unit. Retrofitting:
- Preserves the character of your home.
- Is often more cost-effective.
- Avoids sending tonnes of valuable hardwood to landfill. (carbon friendly)
And with the right glass and sealing, you’ll enjoy comfort without compromise just like this client: Read here about: peaceful nights
The Bottom Line on Retrofit Double Glazing
Retrofit double glazing is one of the smartest investments you can make for comfort, efficiency, and sustainability but only if it’s done right.
If you’re in Melbourne or Tasmania and want a retrofit service that includes all the important details, repairs, draught sealing, premium glass, and long-term protection, contact Sealasash.
It’s not just about installing new glass. It’s about giving your windows another 100 years of life.
