Windows

Double Glazing Sash Windows

Retrofit double glazing for your existing sash window frames. Upgrade to high-performance insulating glass, without sacrificing the style and character of your home.

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Double Glazing Cost Calculator

$1,500 to $1,900

Fully Installed (per set)

Per set, depending on size. Price above includes Economy ThermoTech™ glass as standard - see other glass options below or use our double glazing cost calculator for an approximate price for your project.

  • Sash rebates modified to fit double glazed unit
  • Double Glazed unit fully installed within existing frame
  • High performance weather seal installed
  • Counterbalance mechanism modified to operate with heavier glazing
  • Beading replaced with new hardwood beads
  • Install new sash lock
  • Removal and recycling of old glass

Glass Options

Most popular

Economy ThermoTech™

$285 /sqm

U-VALUE
2.5

SHGC / VLT
0.71 / 78

WARRANTY
10 yr

  • Two sheets 4mm glass
  • 12mm argon gap
  • Doubles energy efficiency
  • Australian made
Most popular

LightBridge / Optitherm™

$395 /sqm

U-VALUE
1.4

SHGC / VLT
0.59 / 79

WARRANTY
10 yr

  • Toughened 4mm glass
  • Argon gap
  • Low-E coating
  • Grade A safety glass
Best for noise

LightBridge Next / Optitherm Hush™

$455 /sqm

U-VALUE
1.4

ACOUSTIC
RW38

WARRANTY
10 yr

  • 6.5mm VLam Hush layer
  • Thermal spacer + argon
  • UV protection (<1% trans)
  • Impact-resistant laminate
Best for heritage

Ultimate Performance VIG

$895 /sqm

U-VALUE
0.4

THICKNESS
8.3mm

WARRANTY
15 yr

  • Vacuum insulated glass
  • Titanium seal, 0.3mm gap
  • Reduces heat loss 93%
  • Grade A safety glass

Other window styles

casement window

Casement Windows

From $600

View pricing
doublehungwindow322x200

Double Hung Windows

From $1,500

View pricing
sliding window

Sliding Windows

From $650

View pricing
awning window

Awning Windows

From $600

View pricing
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