Double Glazed Windows Recommendations


I'm going mental and need to soundproof my apartment.

Does anyone have any recommendations (from experience) for reputable businesses for installing Double Glazed windows for south west Sydney?

These things are so expensive and it's hard to know a good from dodgy business, so I want to get it right.

Any builders out there have any recommendations?



    In general aussie tradies are terrible for double glazing - you'd think it was gold or something.

    For soundproofing you are better off with triple glazing, and I have heard of people getting them manufactured overseas and then shipped here to be installed by a local.

    • +1 vote

      I have heard of people getting them manufactured overseas and then shipped here to be installed by a local.

      I have seen builders get container loads from China of windows.

      I've been exploring the idea of just using perspex and cutting to size then installing onto the existing frame. You just need to seal the edges to get the air barrier. When I was in uni during winter hanging opaque paint drop sheets over window binds helped a lot with keeping the heating in (not necessarily noise out).


      sounds amazing, I just don't know where to start

  • +2 votes

    Hi there,

    I'm in Melbourne so can't recommend any suppliers in Sydney but we have got ours manufactured by a company local here. We, like you are in an apartment and have a lot of sound intrusion from trams, trains, and traffic. For our sliding doors we installed acoustic double glazing, cheaper than triple glazing and still very effective. One side of the glass is laminated twice as thick (2 pieces back to back). This is what eliminates sound. Highly recommended. Thanks


    Had a similar issue in our old apartment in which the bedrooms were on a busy(ish) road. We finally got sick of the noise at night and installed some cheap(er) retrofit double glazing from magnetite on our large sliding doors. Do a quick google.

    It's just a 2nd layer of laminate/perspex sort of thing they put over the existing windows. It still wasn't cheap, but cheaper than the glass double glazing alternative plus we would have had issues with strata.

    It worked and significantly cut the sound coming through - not totally though, but I don't think anything would be.

    We were happy with the results and wondered why we never did it earlier.


    i've just started looking at acoustics and soundproofing and came across this video talk i watched recently.

    i was thinking of measuring up a sheet of thick perspex and attached some foam around it and shoving it into the window seal and seeing if that helps.

    there's other stuff you can do as well, acoustic curtains etc.

  • +1 vote

    If there is room in the window sill you can install another complete window for the maximum sound proofing. The factors that increase the soundproofing are the thickness of the glass in the windows and the space between the glass panes.

    I live on a very busy and noisy road and looked at this extensively when deciding how to block out noise. I changed out the very thin original window glass for 10mm thick glass panes. I then installed a complete set of sliding windows with 10mm thick glass on the inside of these original windows. I used soundout windows, which I think were made by but bought them locally in Sydney from a random window joint. I have a 8cm gap between the two windows.

    I would say doing this blocked out a good 95% of the traffic noise at the front of my house. Mind you I am in a double brick house which helped. I also installed two solid wood doors with seals on the front of my house which is like an airlock coming in but again, cut noise almost completely.

    Anyway, food for thought, especially if you have deep window sills.


      thank you! i'm pretty sure the glass i've got now is like 1mm. lol I'd love to do what you've done. Did you have the same business replace your original glass and install the second layer? Got about 8-9 cms indent for the balcony doors and 10cm for window sills

      • +1 vote

        I have a mate who is a glazier so I got him to swap out the glass in my existing old style sash windows at the cost of the glass.

        As for the secondary windows that I installed inside my original windows, I ordered them direct from a local (Sydney) window manufacturer who delivered them with 10mm glass already installed. I then paid for my carpenter to put them in. I bought 3 largish windows, about 3m by 1.5m high. From memory that set me back about $4000.

        I do remember that it paid to shop around. I was quoted between that $4000 and up to about $10000 for the same windows from different places. The further west in Sydney the businesses I called were, the cheaper it got.

        By the way, the magnetite windows mentioned here to my understanding are not glass, they install a sheet of perpex/acrylic onto the inside of the window. They usually fix them with strips of strong magnets so they can be removed for cleaning etc and to open the original windows. Also if they are fixed in I believe you can get issues with condensation. I considered doing this myself by just buying perpex, having it cut to size and buying some magnetetic strips to put in place. Might be worth considering. I rang Magnetite for a quote at the time and it was almost as much cost as installing the secondary windows I went with.

        The secondary windows isn't particularily stylist though, so I can see why people with federation houses and the like often go for Magnetite solutions.


    if you close every window and door tight … you need to run A/C 24/7 for ventilation ?


      lol well im not an AC type of person. only used it once in the last year.. and I spent my entire life sleeping with my bedroom sliding door wide open all year round. Transitioning to sleeping with it closed was tough. But I'm literally at the point of nearing nervous breakdown from 24 hour traffic noise and poor sleep. So the windows will be open, but when it's time for bed or peace and quiet, it'd be nice (critical) to have some quiet

  • +1 vote

    The cheapest option is Magnetite (mentioned above already). However, this is a retro-fit, as in, they install an additional pane of glass at a distance from the existing glass. If it's a door, then it might not be feasible, but would still be worth a look.
    If that is the case, the only thing you can really do is completely swap out the existing windows with new windows. I don't live in Sydney, so I can't provide company recommendations, but I will say, for acoustic performance, make sure you check the window Rw (Weighted Rating), or STC (Sound Transmission Class). A higher number is equal to a better performance. You would want something like 35-40.
    Also it's worth noting, that usually thicker glass is better than double glazing, e.g. 10mm thick glass with a laminated inter-layer will perform better than 6mm glass / 12mm airgap / 6mm glass double glazing.

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