Planning · 6 min

How to Measure Windows for Replacement

Accurate measurements before you get quotes save time and prevent the most common ordering mistake: windows that are a quarter inch too large to seat properly. Here is how to measure for a retrofit replacement in a typical San Diego home.

What you'll learn

  • The difference between the rough opening, the frame size, and the glass size, and which number to give a supplier
  • How to measure for a retrofit insert versus a full-frame replacement
  • What to do when the opening is out of square, which is common in pre-1990 San Diego homes
  • The standard deductions installers use and why you should leave final measurement to the crew

Step by step

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Safety note

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