DO I NEED A PERMIT TO REPLACE WINDOWS IN CALIFORNIA?

It depends on the city, and on whether the new window is the same size as the old one. Cities and counties issue building permits, and each publishes its own rules. The ones we read do not treat windows the same way:

• Irvine: the Permits Not Required page lists “Replacement windows and doors having the same dimension as those being replaced” that need no change to the structural frame or opening size. Such replacements must still conform to the codes and ordinances on weatherproofing, security and energy efficiency.
• Newport Beach: the Building Division says express permits are for simple single-scope projects such as “changing out your windows and doors.” Its Online Window & Door Replacement sheet (revised July 2023) allows an online window permit only when windows are replaced like for like in size.
• Huntington Beach: Municipal Code Section 17.07.040 (Ordinance 4343, December 16, 2025) exempts “Replacement doors and windows when the waterproofing membrane is not altered” and emergency egress dimensions are “equal to or better than the original permitted layout.”
• Carlsbad: Municipal Code Section 18.20.030 requires a permit to “construct, enlarge, alter, repair, move, demolish” a building. That section's list of exempt building work names window awnings but not window replacement, so ask the Building Division.
• County of Orange: OC Public Works' Residential Window Changeout handout (revised December 2025) says “A building permit is required for any window replacement.”

• Irvine: Permits Not Required (opens in a new tab)
• Newport Beach: Online Permitting (opens in a new tab)
• Huntington Beach: Municipal Code Section 17.07.040 (opens in a new tab)
• Carlsbad: Municipal Code Section 18.20.030 (opens in a new tab)
• LADBS: Express Permits bulletin (PDF) (opens in a new tab)
• OC Public Works: Residential Window Changeout (PDF) (opens in a new tab)

This guide reflects official pages read on October 4, 2026 and is general information, not legal advice. Each city decides what its rules cover. Confirm your scope with the building department before you order.

The California Energy Commission says buildings whose permit applications are applied for on or after January 1, 2026 must comply with the 2025 Energy Code. Chapter 9 of the Commission's 2025 Single-Family Residential Compliance Manual says replacing a component the Energy Code regulates is an alteration, not a repair. For replacement windows it lists these prescriptive limits under Section 150.2(b)1B:

• U-factor: no more than 0.27 in climate zones 1 through 5, 11 through 14 and 16, and no more than 0.30 in climate zones 6 through 10 and 15.
• Solar heat gain coefficient (SHGC): no more than 0.23 in climate zones 2, 4 and 6 through 15.
• Small jobs: up to 75 square feet of replacement windows may instead meet a U-factor of 0.40 in all climate zones and an SHGC of 0.35 in climate zones 2, 4 and 6 through 15.

Chapter 3 of the manual explains the two numbers. The U-factor measures how much heat can pass through the product, and lower is more efficient. The SHGC measures heat gain from sunlight, and a low number means the window keeps out most solar heat.

City handouts print their own figures. The County of Orange's handout gives a maximum U-factor of 0.3 and a maximum SHGC of 0.23.

We do not assign climate zones to cities, and the manual lists other exceptions. It explains the Energy Code but is not the code itself. Ask your building department which limits apply at your address.

The Energy Commission's window installation form for the 2025 code, CF2R-ENV-01-E, says NFRC rated products have a temporary label that can be looked up in the NFRC product directory.

That label is what the inspector checks. The form says: “Temporary labels are not to be removed until verified by the building inspector.” Newport Beach's sheet agrees: “Window labels shall remain until inspected.” Ask your installer to leave every sticker in place until then.

The County of Orange's handout, citing Section 319 of the 2025 California Residential Code, says emergency escape and rescue openings need a net clear opening of at least 5.7 square feet, with a minimum height of 24 inches, a minimum width of 20 inches and a bottom edge no more than 44 inches above the floor. Its table allows 5 square feet at grade level. The handout warns that “Some restrictions and/or modifications might be required” when a bedroom window that falls short is replaced.

Newport Beach's sheet says windows that serve as escape openings “shall be the manufacturer's largest size that will fit in the opening,” with at least 24 inches of clear height and 20 inches of clear width.

Safety glazing is the other check. The County's handout says replacement windows “shall have safety glazing if located in hazardous locations.” Newport Beach's sheet says “Safety glazed windows must be used in appropriate locations.” Ask the building department which windows that covers.

These figures come from two local handouts, and Newport Beach's sheet predates the 2025 codes. Confirm glass type and bedroom window sizes with your building department before you order.

Local handouts add carbon monoxide alarms. The County of Orange's handout says battery-operated smoke and carbon monoxide alarms are required if not already installed. Newport Beach's sheet says both kinds of detector “must be in place at time of final inspection.”

Older plumbing fixtures are a separate question. For a single-family home built on or before January 1, 1994, Civil Code Section 1101.4 makes replacing all noncompliant plumbing fixtures a condition of final permit approval for building alterations or improvements. Irvine's Informational Bulletin 321 (revised 2021) lists window replacement among the maintenance activities that are exempt from that retrofit. Other building departments may read it differently. Our bathroom permit guide covers the fixture law.

If your home is in a homeowners association, check its governing documents and ask the association whether new windows need its approval before you order. Get the answer in writing. The building department does not answer that question for the association, so ask both. Our guide to remodeling in an HOA covers the state rules for that review.

If your home is near the coast, ask your city's planning department whether the address is in the Coastal Zone and whether your window work needs a coastal development permit as well as a building permit. Ask before you order. Our coastal permit guide explains what is exempt and who issues the permit.

• Ask the building department whether your scope needs a permit, and how it treats a new or larger opening.
• Find out which U-factor and SHGC limits apply at your address, and get the rated values for the exact product in writing.
• Ask how each bedroom window will meet the city's escape opening rules.
• Ask which windows need safety glazing.
• Tell the installer to leave the NFRC labels on until the inspector has seen them.
• Check your smoke and carbon monoxide alarms before the final inspection.
• Confirm in the contract who pulls the permit and who meets the inspector.
• Ask your HOA and, near the coast, the planning department.

If you would like help sorting out the rules for a window project, Golden Empire USA offers a free assessment with a written scope.