Permit360
Permit Basics··5 min read

Do I Need a Permit to Replace Windows in LA?

Yes — LADBS requires an Express Building Permit for window replacement in LA. Same-size, same-type swaps cost $100–$200 total and issue in 1–3 days.

Key takeaways
  • LADBS requires a permit for any window replacement, even same-size dual-pane swaps.
  • Same-size, same-type replacement qualifies for the Express Permit pathway — fastest issuance.
  • Resizing the opening triggers structural review and standard plan check.
  • Total Express cost: $100–$200 for a typical multi-window job.
  • Title 24 energy compliance (U-factor, SHGC) is mandatory for all new windows.
  • Tempered glass required at specific locations near doors, stairs, and wet areas.
  • NFRC labels must stay on windows until inspection.

The two pathways for window replacement

Window replacement in LA splits into two paths based on whether you’re keeping the existing opening or changing it.

Same-size, same-type swap (Express Permit)

Dual-pane retrofit replacing existing dual-pane, slider replacing slider, casement replacing casement — all qualify for the Express Building Permit pathway. Apply online through PermitLA, no drawings, no plan check, permit issues in 1–3 business days.

Resizing the opening (standard permit)

Making a window bigger, adding a window where none existed, or changing window type (e.g., fixed to operable) requires a standard Building Permit. Header sizing requires structural calculations; opening expansion may affect shear wall capacity in older homes.

How much it costs

Express Permit for a typical 6–10 window replacement project (project valuation $8,000–$15,000):

  • Express Building Permit: ~$45
  • Per-window fixture fee: ~$8–$15 per window
  • State surcharges: ~$25
  • Approximate total: $120–$220

Use the Permit360 fee calculator for an exact estimate. For broader fee structure, see how much an LADBS building permit costs in 2026.

Title 24 energy compliance

California Title 24 requires all replacement windows to meet specific energy performance ratings:

  • U-factor (heat transfer): typically ≤0.30 for residential climate zones in LA
  • SHGC (solar heat gain coefficient): typically ≤0.23

Any window labeled NFRC certified will list both values. Keep the NFRC sticker on the window until after the inspector signs off.

Doing windows plus stucco or siding?

Bundled exterior projects often need multiple permits at once. Use the Permit360 scope guide to map out the full permit set — windows, siding, and any structural work — in one shot.

Tempered glass locations

Building code requires tempered (safety) glass at specific locations:

  • Within 24 inches of a door, where the bottom of the pane is below 60 inches
  • Within 60 inches of stair treads or landings
  • Within 5 feet of a tub, shower, or pool
  • Any single pane larger than 9 sq ft with bottom below 18 inches above the floor

Inspectors check these locations carefully — wrong glazing here is a common inspection failure.

Common pitfalls

  • Egress requirements. Bedroom windows must meet egress (a certain minimum opening size for emergency exit). Replacement windows in older openings sometimes shrink the openable area below code.
  • Header replacement. Resizing the opening usually requires structural header replacement — adds $400–$1,000 per opening.
  • Lead paint. Homes built before 1978 have lead paint disclosure requirements during any window work.
  • Flashing. Inspectors look for proper flashing details around new windows. Bad flashing is the #1 source of long-term water damage.

Frequently asked questions

Can I replace windows myself or do I need a contractor?

You can pull an owner-builder permit and do the work yourself. Most homeowners hire a licensed contractor, who pulls the permit on your behalf.

Do I need a permit for same-size dual-pane replacement?

Yes, but it qualifies for the Express Permit pathway — no plan check, issued in 1–3 days through PermitLA.

What if I want to make a window bigger?

Resizing the opening triggers structural review (header replacement), which requires a standard building permit with plan check.

Are there energy efficiency requirements?

Yes. All replacement windows in LA must meet California Title 24 fenestration U-factor and SHGC requirements. NFRC labels must remain on the windows until inspection.

Do I need tempered glass everywhere?

No — only at specific locations: within 24 inches of a door, within 60 inches of stair landings, within 5 feet of a tub or shower, and in any pane larger than 9 sq ft within 36 inches of the floor.