Window replacement Santa Clara

Replacing windows on Santa Clara's boom-era tracts and Old Quad houses

Santa Clara's planning FAQ says the city considers any home 50 years old or older a potential historic resource, and a large share of its houses date from the post-war boom, so a window job here can begin with a question for Planning. The glass is then set by the city's Climate Zone 4 sheet: up to 75 square feet replaced may use a U-factor of 0.40 and a solar heat gain coefficient of 0.35, counted on the whole window including its frame.

Energy Code zone
Climate Zone 4 in 95050, 95051, 95053 and 95054
Up to 75 sq ft replaced
U-0.40 and SHGC 0.35, area taken on the whole window and frame
Over 75 sq ft replaced
U-0.27 and SHGC 0.23, or exterior shading that meets the same limit
HRI house, major job
Major SPA permit: street side, or more than half the windows
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  • Rules on this page checked against 15 public sources, October 2026
Mission Santa Clara de Asís
Mission Santa Clara de Asís. Photo: JaGa, CC BY-SA 3.0, via Wikimedia Commons.

Permits and local rules

Santa Clara papers that decide what a window job needs

  1. RN02, the city's Climate Zone 4 table

    Last revised in April 2026, the Building Division's sheet on prescriptive requirements for additions and alterations splits replacement from added glass. Replacing existing glass with no increase in area: up to 75 square feet of vertical fenestration at U-0.40 and SHGC 0.35, more than that at U-0.27 and SHGC 0.23, and skylights at 0.40 and 0.30. The area is taken on the whole window including its frame, and a window set in the same wall where the same or larger area was removed counts as altered rather than new.

    Source: City of Santa Clara Building Division (santaclaraca.gov)

  2. Historic review, by scope of work

    The Planning Division's table, revised in January 2026, sorts window work by property type. On an inventory house a single window replacement takes a Minor Significant Property Alteration permit over the counter or a Major one, and a replacement on the street elevation or of more than half the windows takes a Major SPA, reviewed by the Historical and Landmarks Commission and decided by the Director of Community Development. An alteration stops counting as a small project if it removes original windows, unless the director accepts a replacement in like materials and finishes.

    Source: City of Santa Clara Planning Division (santaclaraca.gov)

  3. The 50-year line in the planning FAQ

    Santa Clara says it considers a home 50 years old or older a potential historic resource, then looks at its architecture, neighborhood and local significance, and notes that not every older home is a historic resource. In the permit table, a property flagged as potentially historic on its parcel record in Accela takes over-the-counter architectural review for window replacement, measured against the city's design standards rather than the Secretary of the Interior's.

    Source: City of Santa Clara Planning Division (santaclaraca.gov)

State license for this work: C-17 Glazing, B General Building. Look up a contractor's license on the CSLB website (cslb.ca.gov).

Free, no obligation. Next, add your details in the request form.

The work

How Santa Clara sizes a window job, from one sash to every opening

  1. One bathroom window

    The Building Division's prescriptive sheet says its replacement limits apply even when a single window, frame included, is swapped, so even one unit has to meet the U-factor and heat gain limits. Placement matters as much in a bathroom. The city's remodel requirements, revised in May 2026, call for tempered or laminated safety glass in windows in walls facing a tub or shower when the glass is less than 60 inches above the standing surface and within 60 inches horizontally, citing CRC R324.4.

  2. Every window in the house at once

    Once more than 75 square feet is replaced, the sheet's limits drop to a U-factor of 0.27 and an SHGC of 0.23, the values new houses meet in Climate Zone 4. Where a west- or south-facing unit misses the heat gain figure, the Energy Code's shading section, which replacement windows must meet, offers other routes: an exterior operable shading louver or other exterior device that achieves the required coefficient, a combination of device and glass, or, for south-facing glass only, overhangs that fully shade it at solar noon on August 21 and leave it in sun at noon on December 21.

  3. A new or wider opening

    The city's residential submittal checklist names window size changes and new windows among the work that needs a building permit, on plans the Planning Division has approved first. The plans show the location, size and operation of new and existing windows and doors, with safety glazing, and include a window and door schedule. Added glass is held to U-0.27 and SHGC 0.23, and total glazing may not pass 20 percent of conditioned floor area, or 5 percent facing west, though adding 16 square feet or less is exempt from those area caps.

  4. Sliding doors and window style on the street side

    Santa Clara's single-family design guidelines ask that sliding glass doors in aluminum frames face away from street views, that a house avoid mixing window and door styles or materials, and that window style and proportion follow the architecture of the house or the neighborhood. The Energy Code counts glazed doors as fenestration, so a new patio slider carries the same Climate Zone 4 limits as the windows beside it.

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Get quotes for window replacement work in Santa Clara

Two short steps. A local pro who takes this work calls or texts you back.

To send a request, call or text (415) 449-8213.

Free to request, and you agree the scope and price with the person you hire before work starts. In California, a job over $1,000 in labor and materials, or one that needs a building permit, must be done by a contractor licensed by the CSLB in the right class. Ask for the license number and check it at cslb.ca.gov.

Tall arched double windows with divided panes in a white paneled room
Tall arched double windows with divided panes in a white paneled room. Photo: WesselArtPublic, CC BY-SA 4.0, via Wikimedia Commons.

The houses here

Tract houses from the 1950s boom, Old Quad survivors and Rivermark

Santa Clara grew from 11,702 people in 1950 to 86,118 in 1970, and the subdivisions built for that growth cover much of the city. By the city's own measure each of those houses is now old enough to be a potential historic resource, though being old enough is not the same as being on the Historic Resources Inventory, the list kept as Appendix 8.9 of the General Plan, which the city says leaves out many structures that were never surveyed. Rivermark, laid out on part of the former Agnews west campus after it closed in 1995, is the newer exception, and a house built in 1978 or later falls outside EPA's lead renovation rule.

Questions

Santa Clara window questions, from tract houses to the Old Quad

Our 1958 Santa Clara ranch is not on any historic list. Does that mean it is not historic?

Not on its own. The city considers a home 50 years old or older a potential historic resource and then weighs its architecture, neighborhood and local significance; the inventory itself leaves out many structures that were never surveyed. If the parcel record in Accela flags the house as potentially historic, a window replacement there goes to over-the-counter architectural review.

Can new windows go through a Building Simple Permit?

No. Simple Permits cover like-for-like HVAC equipment, solar through SolarAPP+, re-roofs, water and sewer lines, clean-outs and water heaters at single-family homes, duplexes and ADUs, and windows are not on the list. Townhomes, condos and properties in historic areas are excluded altogether. The city's advice when the record type is unclear is to apply for a Building Regular Permit through the online portal.

Our Old Quad house has a Mills Act contract. Does that change the window work?

It gives the house its own column in the city's historic permit table. For a Mills Act property, a single window replacement takes a Minor SPA permit over the counter or a Major SPA, and replacing street-side windows or more than half of them takes a Major SPA. The table applies the Secretary of the Interior's Standards to Mills Act properties, as it does to houses on the inventory.

We are adding a window on the side of our second floor. What will Santa Clara look at?

Privacy, under the design guidelines. Where a new second-floor window faces a side property line less than 15 feet away, the city encourages a sill at least five feet above the floor, or clerestory or frosted glass, and asks that upstairs side windows be kept to the minimum size the building code allows for light, ventilation and emergency egress. Second-floor bathroom windows should use obscure glass where possible.

Does lead-safe work apply to window replacement in a Santa Clara house?

In any house built before 1978, yes. EPA's rule exempts small jobs that disturb only a few square feet of paint, but not work that involves window replacement, so the firm needs EPA or state certification. That reaches most of the city's post-war tracts and the Old Quad, and leaves out newer neighborhoods such as Rivermark.

Our inventory house needs new street-side windows. When does the Historical and Landmarks Commission see it?

At one of its regular meetings: the seven-member commission, appointed by the City Council, typically meets once a month on the first Thursday at 6 p.m. Replacing the street-side windows of an inventory house, or more than half of its windows, is a Major SPA, so the commission makes a recommendation and the Director of Community Development decides. On such a house the window order is worth placing after that decision rather than before it.

Free, no obligation. Next, add your details in the request form.

Before you hire

Questions for a Santa Clara window contractor before anything is ordered

  • Is our parcel flagged as potentially historic in Accela, and will you check with Planning before the order goes in?
  • How many square feet do the windows total, measured frame included, and does the job fall under or over 75?
  • If a west or south unit misses SHGC 0.23, would an exterior shading device or overhang satisfy the Energy Code instead?
  • Will a window near the tub be tempered or laminated, and is that written on the order?
  • Is the C-17 Glazing license current on cslb.ca.gov, and does your firm hold EPA lead-safe certification for pre-1978 houses?

Where these facts come from

Checked against these public sources in October 2026. Rules and programs change: confirm permit requirements with the city before work starts, and a contractor's license on the CSLB website.

  • santaclaraca.gov: 639179768475800000 (santaclaraca.gov)
  • santaclaraca.gov: 639034700447970000 (santaclaraca.gov)
  • santaclaraca.gov: faqs (santaclaraca.gov)
  • santaclaraca.gov: historic properties preservation (santaclaraca.gov)
  • santaclaraca.gov: permitting for historic properties (santaclaraca.gov)
  • santaclaraca.gov: 639106388563530000 (santaclaraca.gov)
  • santaclaraca.gov: 639227527141270000 (santaclaraca.gov)
  • santaclaraca.gov: 639094307749200000 (santaclaraca.gov)
  • santaclaraca.gov: simple permits (santaclaraca.gov)
  • energy.ca.gov: CEC 400 2025 010 F (energy.ca.gov)
  • energy.ca.gov: BuildingClimateZonesByZIPCode ada (energy.ca.gov)
  • ecfr.gov: section 745 (ecfr.gov)

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