Local research · updated July 2026
Replacement Windows in Modesto, California
Modesto sits in California's northern Central Valley — extreme summer heat, winter Tule fog, ag dust, and poor air quality define the envelope problem. Of the city's housing units, 55.3% predate 1980 and the median year built is 1978. Stanislaus County is ENERGY STAR South-Central / IECC 3B (hot-dry): low SHGC is the number that moves cooling bills. Title 24 applies to replacements. This is Valley heat glass — not Bay Area marine.
Short answer
In Modesto, a standard replacement window (double-hung, casement or slider) typically costs $585–$3,315 installed. Bay and bow windows run $2,915–$9,320+, and a sliding patio door $1,750–$5,825. Frame material and the glass package decide where a project lands in that range.
Planning ranges built from NREL and BLS cost data, localized to Modesto with the BEA Regional Price Parity for Modesto, CA (2024). How we estimate →
55.3%
of Modesto homes were built before 1980, the era of single-pane and early aluminum windows
Source: U.S. Census Bureau, 2019–2023 ACS 5-Year Estimates
1978
median year built across Modesto's 75,525 housing units
Source: U.S. Census Bureau, 2019–2023 ACS 5-Year Estimates
SHGC ≤ 0.23
the ENERGY STAR v7.0 number that matters most in the South-Central zone
Source: EPA ENERGY STAR v7.0
Window installers in Modesto
Compare companies serving Modesto. Request a free, no-obligation quote and we route it to the company or a vetted local installer.
| Company | Location | Request a quote |
|---|---|---|
 4.8 · 200,000+ reviews | Hayward, CA | Get a quote → |
Renewal by Andersen of San Francisco
4.8 · 200,000+ reviewsHayward, CA showroom · serving the Modesto metro
Full-service manufacturer and installer, transferable warranty, local crews. Why it's our Top Pick
Get a quote →Listings compiled from manufacturer dealer locators and public business records. Premier and Sponsored Partners pay for placement and are labeled as such; star ratings shown are reported by the partner, with the source and date beside them. See our advertising disclosure. Contacting a company shares your details with it (or a vetted local installer) so it can reach you about your project.
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What drives window decisions in Modesto
- South-Central / 3B: U ≤ 0.28, SHGC ≤ 0.23 under ENERGY STAR v7.0; SHGC does the heavy lifting.
- Title 24 makes low-SHGC glass effectively required on permitted jobs.
- Tule fog and wildfire smoke reward tight multi-pane seals vs leaky aluminum sliders.
- PG&E territory generally no fat window rebate; 25C expired; CA IRA waitlists common.
Replacement windows & doors by type in Modesto
Local cost ranges and South-Central-zone efficiency guidance for each window and door style, specific to Modesto homes:
Ranges localized to Modesto's cost level: national planning ranges shifted by the BEA Regional Price Parity for Modesto, CA (104.1, U.S. = 100; 2024). How we estimate local costs →
Efficiency requirements for Modesto's climate
Modesto sits in the ENERGY STAR South-Central zone (IECC zone 3B (warm, dry), Stanislaus County). Under the v7.0 specification, qualifying windows need a U-factor of 0.28 or lower and an SHGC of 0.23 or lower. Cooling-leaning climate: blocking solar heat gain (low SHGC) matters as much as insulation.
Not sure what these numbers mean? Read our plain-English guide to U-factor and SHGC.
What replacement windows cost here
Central Valley labor is below coastal California. Title 24 paperwork and low-SHGC packages add cost; tract homes often take flush-fin retrofits. Federal 25C is gone. Itemize NFRC U-factor and SHGC.
For a breakdown by frame material and install type, see our full cost guide.
Rebates & incentives in California
The federal window tax credit (25C) ended for projects placed in service after December 31, 2025. If your windows were installed in 2025, you can still claim it on your 2025 return — but for new projects there is no federal window credit. State and utility programs are now the main source of window incentives.
California's IRA rebates run through the California Energy Commission. The HEAR-funded HEEHRA program (delivered via TECH Clean California / The Switch Is On) launched for income-eligible households, but Phase I single-family rebates were fully reserved statewide as of early 2026, with a waitlist and a Phase II in design. HOMES funds are being routed into the Equitable Building Decarbonization Direct Install program and a Pay-for-Performance program that were not yet issuing rebates as of mid-2026. Confirm current availability first.
- Equitable Building Decarbonization Direct Install Program. A CEC-run program that provides no-cost efficiency and electrification retrofits for income-qualified households in target regions; envelope work can be included in a project scope, but it is contractor-delivered rather than a rebate you apply for. Confirm current region availability. (California Energy Commission program pages)
- SMUD Home Performance Program (Sacramento). SMUD, Sacramento's municipal utility, offers whole-home performance incentives that can include window upgrades meeting ENERGY STAR criteria when packaged with other qualifying efficiency work — one of the few California utility programs that pays anything toward windows. (SMUD rebates and Home Performance Program pages)
- Investor-owned utility programs (PG&E, SCE, SDG&E). California's large investor-owned utilities generally do not offer standalone window replacement rebates; their residential programs focus on heat pumps, weatherization, and financing. Windows mainly benefit indirectly through whole-home and financing offerings — check your utility's current program list. (PG&E, SCE, and SDG&E residential rebate pages)
California's Title 24, Part 6 Energy Code is among the strictest in the nation and applies to replacement windows, not just new construction — permitted replacements in most climate zones must meet low U-factor and low solar-heat-gain (SHGC) prescriptive limits.
Replacement windows in nearby metros
Not in Modesto proper? These nearby markets carry the same local research: housing-age data, climate-zone specs, and current rebate status for each city:
Modesto window replacement FAQ
›Do I need a permit to replace windows in Modesto?
Yes in most cases under Title 24. City of Modesto Building Safety or Stanislaus County, depending on address. Upload energy-code compliance documentation.
›What efficiency numbers should windows hit?
ENERGY STAR South-Central: U-factor 0.28 or lower and SHGC 0.23 or lower. Valley cooling makes SHGC the priority. Read the NFRC label.
›Are there rebates?
Federal 25C expired December 31, 2025. California IRA and PG&E programs rarely pay a simple window check — confirm CEC and utility status. Budget on cooling savings.
›How is Modesto different from Santa Rosa?
Hot-dry Valley 3B vs North Bay marine 3C. Modesto is cooling and dust; Santa Rosa adds wildfire and marine influence. Different glass priorities.
Sources
- — U.S. Census Bureau, American Community Survey 5-Year Estimates (B25034, B25035)
- — EPA ENERGY STAR Version 7.0 Residential Windows specification
- — DOE/PNNL IECC climate zone assignments by county
- — San Joaquin Valley Air Pollution Control District; NWS Sacramento; California Title 24
- — IRS, 25C Energy Efficient Home Improvement Credit (P.L. 119-21)