REPLACING WINDOW GLASS

ALUMINIUM WINDOWS:
Your standard storm window almost always uses single-strength glass (2.5 mm or 3/32" thick). Approximate cost to repair is the cost of single-strength glass ($3.30 per square foot) plus $9.50 labor. Extra to repair broken corners.
WOOD WINDOWS:
These always use single-strength glass (2.5 mm or 3/32" thick -- cost $3.30 per square foot). Nevertheless, if possible, you may elect to have a broken pane of single strength glass replaced with double-strength glass (3.0mm or 1/8" thick) for added strength. Double-strength glass costs $3.90 per square foot. Labor in our shop to clean out the old putty and reputty costs from $10 to $15 per window depending on glass size and labor involved.
DOING IT YOURSELF:
Not recommended on aluminum windows but give it a try on the wood. Here's how: