So long story short we live on a steep private driveway with about 7
houses below us in a very quiet suburb. Unfortunately a lot of the
houses below us work shifts and our main bedrooms and ensuite front the
street. The end result is we get woken up 2-3 times a night by traffic
noise which is getting annoying.

I'm just looking to block out as much traffic noise as possible. I
don't care about thermal performance at all. I've got 3 quotes for
double glazed windows from common suppliers recommended in Sydney by but it seems really expensive:

French door x 2 ----> 2100mm 1900mm
Window casement x 1 ----> 930mm 610mm

Quote 1 10.38 / 16mm gap / 6.38 = $9350
Quote 2 6.3 / 24 mm gap / 6.3 = $7200 (+35% for any colour other than white)
Quote 3 8.76 / 14mm / 6 = $16500 (!!)

All include install.

Then I stumbled across http://www.build.com.au/window-acoustics-and-noise-control which seems to suggest a single 10.38mm would achieve a 43% reduction which stacks up ok vs double glazing.

I'm not interested in retrofitting a second panel (magnatite?
soundbarrier? etc) as my existing windows are mission brown and pretty
old and crap looking anyway (see my other thread). I don't have time for DIY anything due to
young kids :(

I'd love to get some advice on:
- Are the quotes I've got reasonable for double glazing for 3 windows/doors? Or are they having a laugh?
-
How would the price of thick laminated (10mm-12mm) glass including aluminum frame, install etc compare price wise to upvc double glazing?
-
Has anyone had thick laminated glass installed for traffic noise and
how do you find it compared with 3mm default glass?

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