Window Replacement in San Jose, California

In San Jose, a straight retrofit window needs no building permit, but most other window replacements do. The city's window replacement page says a building permit is not required "if simply installing a retrofit window," and is required when the window frame is altered, the window flashing is altered (including removing the nailing fin), the exterior wall finish such as stucco is removed, or the property is on the City's Historic Resources Inventory (San Jose window replacements) ⁹. The same page says that whether or not a permit is required, the replacement must conform to current construction standards for window design, safety glass and size, including egress ⁹.

The energy side is set by the state. California's Energy Commission says buildings whose permit applications are applied for on or after January 1, 2026 must comply with the 2025 Energy Code, Title 24 Part 6, and its ZIP code list places San Jose's ZIP codes in Title 24 climate zone 4 (California Energy Commission) ²⁴. The contractor license and the Title 24 window values are covered on our California page; this page covers what is particular to San Jose.

Permits: retrofit or not

The city defines a retrofit window as one installed within the existing opening with no alterations to the surrounding window frame or flashing, and the window frame as the header, king stud, cripple stud, sill and associated supports (San Jose window replacements) ⁹. So the installation method largely decides the permit question: a unit that leaves the frame and flashing alone is a retrofit, while a job that alters the frame, removes the nailing fin or cuts back stucco needs a permit. A retrofit window on a property listed in the Historic Resources Inventory needs a permit too ⁹.

What the window replacement page says about the rest of the job ⁹:

• What the replacement must meet. Even without a permit, the new window's design should comply with current requirements for new construction as much as possible, new glazing in a hazardous location must be safety glass, and the replacement must meet the size rules for new construction, including egress size, or, when it goes into an existing frame, meet them as much as possible. For sleeping rooms and basements the page lists a minimum 5.7 square foot opening (5 square feet in some ground-level cases), at least 24 inches high and 20 inches wide, with a maximum of 44 inches to the bottom of the clear opening.
• Who applies. The city recommends that a contractor holding a state license be the applicant, and says whoever signs the building permit application is responsible and potentially liable for all activity under the permit.
• How to apply. Residential projects that qualify use the Simple Projects Service at the Permit Center at City Hall, where a permit is issued during the visit if the documents are accurate and no plans are required; others use the Standard Plan Review Service, applying at SJPermits.org and uploading plans to SJePlans.
• Fees. The page points to the city's Building Fees page; it does not give a window permit amount.

SJPermits.org, the city's online permit system, is where you pay permit fees, schedule inspections and search permit history and property information, and it says the 2025 Building Codes have been in effect since January 1, 2026 (SJPermits.org) ¹. Ask each installer whether the job is a retrofit or a full-frame replacement, who applies for any permit, and whether the fee is in the quote. Our articles on whether you need a permit to replace windows and full-frame vs insert replacement explain why the installation method matters.

Title 24 and climate zone 4

California's Building Energy Efficiency Standards, Title 24 Part 6, apply to replacement windows, and the values depend on the house's Title 24 climate zone. The Energy Commission publishes a list of climate zones by ZIP code and an address lookup tool, and says that where a ZIP code contains more than one climate region, local jurisdictions may designate a single climate zone for the whole ZIP code (CEC climate zone tool) ³. In that list, every San Jose ZIP code we checked, 57 in all, is in climate zone 4 (CEC ZIP code list) ⁴.

The 2025 Energy Code applies to permit applications filed on or after January 1, 2026 ², which matches the date SJPermits.org gives for the 2025 Building Codes taking effect in the city ¹. The U-factor and solar heat gain coefficient (SHGC) values that apply to replacement windows by climate zone, and the smaller-replacement case, are set out on the California page. Ask each installer to state the climate zone they used and the NFRC-rated values of the quoted unit, and check the NFRC label on delivery.

Who may do the work

California licenses contractors through the Contractors State License Board, not the city. The license threshold, the C-17 glazing classification and the board's license lookup are on our California page. San Jose's window replacement page recommends that the permit applicant be a contractor holding a state license (San Jose window replacements) ⁹. Before you sign:

• Is the installer licensed by the state board in a classification that fits window work, and does the license number on the quote match the board's record?
• Who will apply for any San Jose permit, and under whose name?
• Can you see recent San Jose jobs and talk to those homeowners?

The guide on how to choose a window installer covers references, contracts and warranties.

Historic properties

San Jose's rule turns on the Historic Resources Inventory (HRI). The window replacement page says that if the house, building or site is listed on the HRI, any kind of window replacement requires a Planning clearance, or possibly a Historic Preservation permit or permit adjustment, and that this step must come before the building permit application (San Jose window replacements) ⁹. For those properties, the page says replacements of original windows should only be proposed if refurbishment is not possible, new windows must match the original design as closely as possible, and Planning will require a site plan ⁹.

The Planning Division describes the HRI as a list of nearly 4,000 identified and listed historic properties, including City Landmarks, City Landmark Districts, Conservation Areas and properties listed at the state and national level, and offers a map to look up a property (Historic Resources Inventory) ¹⁰. Check the map before you order windows. The window page adds that a property in a Planned Development zone must follow that zone's architectural standards and any HOA rules ⁹. Our article on historic home window replacement covers the repair-or-replace question.

Climate and glass

ENERGY STAR places Santa Clara County in its South-Central climate zone (ENERGY STAR climate zone finder) ⁶. For that zone, ENERGY STAR's window criteria call for a U-factor of 0.28 or less and an SHGC of 0.23 or less, with air leakage of 0.3 cubic feet per minute per square foot or less (ENERGY STAR criteria) ⁵. ENERGY STAR is a voluntary label, separate from Title 24.

NOAA's 1991-2020 normals for the San Jose station describe a mild, dry climate with more heating than cooling: a normal annual mean temperature of 60.7°F, 2,183.6 heating degree days against 623.9 cooling degree days, about 16 days a year at 90°F or above, about 3 nights at 32°F or below, and 13.48 inches of precipitation (NOAA normals, San Jose) ⁷. In that climate, the U-factor matters for cool nights and winter, and the SHGC for sunny west and south walls in summer, when the normal June-to-August average high is 80.5°F ⁷. Hillside neighborhoods may differ from the station. The energy-efficient windows explainer and the article on low-E glass cover how the glass behaves.

What window replacement costs

None of the cost sources we use publishes a figure for San Jose, so this page does not give a local price. As a national figure, Fixr reports an average of about $800 per window, typically $450 to $1,200 (updated January 21, 2026) (Fixr) ⁸. The window replacement cost guide sets that survey beside the others, with dates and methods.

Getting quotes in San Jose

Get two or three written quotes that name the brand and series, the glass and its NFRC values, insert or full-frame installation, disposal, and who handles the permit. The article on how to compare window quotes shows how to line them up. When you are ready, you can compare quotes from window installers.

About these figures

• ¹ Official record: SJPermits.org, City of San Jose Development Services Permit Center (2025 Building Codes in effect as of January 1, 2026, online services), checked October 26, 2026.
• ² Official record: California Energy Commission 2025 standards page (permit applications on or after January 1, 2026 comply with the 2025 Energy Code), checked October 26, 2026.
• ³ Official record: California Energy Commission climate zone page (ZIP code list, address tool, split ZIP code rule), checked October 26, 2026.
• ⁴ Official record: California Energy Commission Building Climate Zones by ZIP Code list (the 57 San Jose ZIP codes in ENERGY STAR's county list all in climate zone 4), checked October 26, 2026.
• ⁵ Official record: ENERGY STAR residential window criteria table (South-Central U-factor 0.28, SHGC 0.23, air leakage 0.3 cfm per square foot), checked October 26, 2026.
• ⁶ Official record: ENERGY STAR county climate zone list (Santa Clara County in the South-Central zone), checked October 26, 2026.
• ⁷ Official record: NOAA 1991-2020 normals for San Jose (annual mean 60.7°F, 2,183.6 heating and 623.9 cooling degree days, about 16 days at 90°F or above, about 3 days at 32°F or below, 13.48 inches of precipitation, summer average high 80.5°F), checked October 26, 2026.
• ⁹ Official record: City of San Jose Window Replacements page, updated April 14, 2026 (retrofit windows exempt; permit when frame or flashing is altered, wall finish removed or the property is on the Historic Resources Inventory; standards for design, safety glass and egress size; licensed contractor recommended as applicant; Simple Projects and Standard Plan Review services; historic and Planned Development rules), checked October 26, 2026.
• ¹⁰ Official record: City of San Jose Historic Resources Inventory page (nearly 4,000 properties, classifications, lookup map), checked October 26, 2026.
• ⁸ Reported: Fixr national window replacement cost (about $800 per window, typically $450 to $1,200; updated January 21, 2026), checked October 26, 2026.