Changing a window opening is different from a like-for-like replacement because the wall framing can be affected. Structural support, egress, safety glazing and product-performance details can become part of the permit review.
This guide helps you describe the project accurately. It does not replace a City determination about whether a permit, plan review, inspection or professional document is required.
The exact permit requirement depends on the work, property and current City rules. Use the scope questions on this page and confirm the requirement with the responsible building department.
This guide links to the configured Rancho Santa Margarita window / door replacement workflow because it is the closest supported project category. If your exact scope requires additional forms, plans or review, the City remains the authority.