Retrofit Double Glazing vs Full Window Replacement: Which Do You Need?

Once you've decided your windows need an upgrade, the next question is usually: do I need brand new windows, or can I just change the glass? Both options give you double glazing, and both can make a home noticeably warmer and drier. The right choice mostly comes down to the condition of the frames you already have.

Here's how we explain it to Ballarat homeowners.

What is retrofit double glazing?

Retrofitting means keeping your existing window frames and replacing the single pane of glass with a double-glazed unit. The frame is adapted to take the thicker glass, and the new unit is fitted and sealed in place.

From the street, the window looks much the same as it did before. Inside, you've got two panes of glass with a sealed gap between them instead of one.

When retrofit makes sense

• Your frames are solid, straight and free of rot.
• The windows open, close and lock properly.
• You like the look of your current windows and want to keep it, which is common in older Ballarat homes with character timber frames.
• You want to upgrade in stages, for example starting with the coldest rooms.

Things to keep in mind

• Retrofit relies on the frame being in good shape. Fitting new glass into a tired frame doesn't fix the frame.
• Not every frame profile can take a double-glazed unit. We check this at the measure.
• Draughts from gaps around the frame itself may need attention separately.

What is full window replacement?

Full replacement means removing the whole window, frame and all, and installing a new double-glazed window in the opening. In our case, that's new double-glazed aluminium windows, finished neatly inside and out.

When replacement makes sense

• The timber is rotted, soft, cracked or warped.
• Windows stick, rattle or won't close properly.
• Paint keeps peeling no matter how often you redo it.
• You want a different style, such as larger panes, a new opening type or a more modern look.
• You'd like low-maintenance frames that don't need regular painting.

Things to keep in mind

• Replacement is a bigger job than retrofit, as the old window has to come out and the new one has to be fitted and finished.
• Some internal or external touch-ups around the opening may be needed.
• If you live in a heritage area, it's worth checking any council requirements before changing the look of street-facing windows.

A quick way to check your frames

You can get a rough idea yourself before we visit. Walk around the house and, for each window:

1. Press the timber gently with a screwdriver or fingernail, especially along the bottom rail and sill. If it feels soft or spongy, that's a sign of rot.
2. Look for gaps and cracks where the frame meets the glass or the wall.
3. Open and close it. Does it move smoothly and seal firmly?
4. Check the paint. Constant peeling and bubbling often means moisture is getting into the timber.

Many homes end up with a mix: retrofit on the windows that are in good condition and replacement on the ones that aren't. That's perfectly normal and often the most sensible use of your budget.

How do they compare for comfort?

Both options put double glazing between you and the cold, so both help with condensation, heat loss and outside noise. A new window can also seal better around the opening, which can help with draughts if your old frames have gaps.

Pricing depends on the number, size and type of windows, so we don't quote figures without seeing your home. [CONFIRM: add general pricing guidance if desired.]

What about the look of my home?

This is often the deciding factor in older Ballarat homes. If you love your original timber windows and they're in good condition, retrofit lets you keep that character. If the frames are past saving, new windows can still be chosen to suit the style of the house. We're happy to talk through options at the showroom or during your measure.

Still not sure? That's what the free measure is for

You don't need to work this out on your own. During a free measure, we look at every window, check the frames, and give you an honest recommendation, window by window. If retrofit will do the job, we'll tell you. If a frame needs replacing, we'll show you why.