Egress Window Inspection: What Inspectors Check

Understanding what a building inspector checks during an egress window inspection helps you prepare correctly and avoid the most common failure points. This guide covers both the rough-in inspection (for new or enlarged openings) and the final inspection (after window installation).

Rough-In Inspection: Before the Window Goes In

For projects involving structural work — cutting a foundation, enlarging a rough opening, or installing a new opening — most jurisdictions require a rough-in inspection before the window is set. Schedule this inspection immediately after framing is complete.

What Inspectors Check at Rough-In

  • Lintel/header installation: Correct size, properly supported by king studs and jack studs, bearing at correct length on each side
  • Rough opening dimensions: Width and height match the permitted drawings; verify with tape measure
  • Sill framing: Properly supported, not floating or notched
  • Foundation integrity: No cracks propagating from the cut; concrete properly patched and cured
  • Waterproofing membrane: Sill pan flashing or dam in place before window installation begins

Final Inspection: After Window Installation

The Five Things Every Egress Inspector Checks

1. Net Clear Opening — Physically Measured

The inspector will open the window fully and measure. They use a tape measure, not the label on the window. Have the window cleaned and operating freely. If the window is hard to open due to paint, swelling, or installation issues, address it before scheduling inspection.

2. Sill Height

The inspector measures from the finished floor directly below the window to the bottom of the net clear opening. Confirm your finished floor is installed — inspectors measure to finished floor, not subfloor. If you're measuring before flooring is installed, add your flooring thickness to the rough sill height to confirm compliance.

3. NFRC Label

The inspector verifies the installed window's NFRC U-factor and SHGC match the permitted specification. Leave the label on. Do not remove it before inspection.

4. Flashing and Waterproofing

The inspector checks that sill pan flashing is visible (or that proper installation is documented), that the jamb flashing is integrated with the water-resistive barrier, and that the head flashing is installed above the window. This is the most common failure point — improper or missing flashing fails more final inspections than any other single issue.

5. Window Well (If Below Grade)

The inspector measures the well dimensions (36" projection, 36" width, 9 sq ft area), checks for drainage, verifies cover is openable from inside, and checks for steps/ladder if well depth exceeds 44".

How to Prepare for Your Final Inspection

  • Keep the NFRC label on the window
  • Make sure the window opens fully and freely
  • Ensure finished flooring is installed under the window (or document the thickness)
  • Confirm flashing is visible for inspection if interior trim hasn't been installed
  • Have the permit and any approved drawings accessible
  • Clear access to the window from both interior and exterior
Disclaimer: General information only. Always verify requirements with your local building department.