Window Replacement in Austin, Texas

In the City of Austin, replacing windows size for size is permitted work, not exempt work. The Development Services Department lists "Windows - replacing size for size" among the projects that qualify for a Residential Express Permit, and says the turnaround to issue most Express Permits is one business day (Austin Express Permits) ¹. The city's list of work exempt from building permits includes replacing doors of the same size and operation, and window awnings, but not window replacement (Work Exempt from Building Permits) ².

Three other local rules shape the job. A general contractor registered with the city has to be linked to the permit, and a homeowner can fill that role after registering ¹³. Austin's own energy code sets U-factor and solar heat gain limits for replacement windows ⁴. And a house that is a historic landmark or contributes to a historic district needs historic review for exterior changes, with larger projects going to the Historic Landmark Commission ⁶. The state picture, including what Texas does not license, is on our Texas page.

Permits: the Express Permit for windows

The Express Permit is the city's track for small residential jobs on a single-family house, duplex or two-family house. The Development Services page lists the eligible work, and windows replaced size for size are on it next to items such as siding, drywall repair and some roof work (Express Permits) ¹. The page says that if the work goes beyond these qualifications, a new residential building permit application and its fees are required, and the fees already paid for the Express Permit are not reimbursed ¹. A change in an opening's size is outside "size for size", so ask Development Services which permit fits before an installer cuts a wall.

How it works, from the city's page ¹:

• Who is on the permit. A registered general contractor must be assigned and linked to the building permit. The homeowner can act as the general contractor after registering.
• How to apply. Fill in the Residential Express Permit Application, submit it through the city's web form with the general contractor's AB+C Portal account email and contractor PIN, then pay the invoice on the Austin Build + Connect (AB+C) Portal once the intake team has reviewed the application. If every step is done correctly, the page says, the permit activates automatically on payment.
• Timing. Most Express Permits are issued in one business day, but the page says the timeframe may differ if the property is in a floodplain or historic district.
• Fees. The page does not list amounts; the invoice comes after intake review.

The exemption page adds that work exempt from a permit must still comply with the building codes and other city codes (Work Exempt from Building Permits) ². Our article on whether you need a permit to replace windows explains why cities draw this line differently.

Who may do the work

Austin registers contractors; it does not license general contractors. The city's registration page says trade contractors, general contractors and homeowners acting as contractors must register before construction under a building or trade permit begins, that anyone can be a general contractor, and that "a state license is not required" for a general contractor (Contractor Registration) ³. Trade contractors, such as electricians, need a license with the applicable board or state department as well as city registration ³. The page does not offer a public search of registered contractors, and the state's licensing agency has no window or general contractor program; the Texas page covers that and the state's license search.

Questions to ask each installer:

• Is your company registered with the City of Austin as a general contractor, and will you be linked to the permit?
• Who applies for the Express Permit, and is its cost in the quote?

The guide on how to choose a window installer covers the rest of the vetting.

Austin's energy code and replacement windows

Austin writes local amendments into its energy code. Ordinance No. 20250410-038 adopted the 2024 International Energy Conservation Code with local amendments and took effect on July 10, 2025 (Ordinance 20250410-038; Building Technical Codes) ⁴⁵.

One of those amendments, section R503.1.1.1, covers window replacement in an existing house. Where some or all of an existing window is replaced with a new product, including sash and glazing, the replacement must meet the U-factor and SHGC requirements of Table R402.1.3(1), the ordinance's table for existing buildings ⁴. For climate zone 2, that table lists a vertical fenestration U-factor of 0.40 and a glazed vertical fenestration SHGC of 0.25, and its notes say U-factors and SHGC are maximums and that the table applies to repairs, renovations, and additions that increase conditioned floor area by no more than 40 percent ⁴. When more than one replacement window is installed, an area-weighted average across all of them is an alternative way to show compliance ⁴. Ask each installer to name the NFRC-rated U-factor and SHGC of the quoted unit and confirm they meet these values.

Historic review: landmarks and districts

The Historic Preservation Office's review page says you must go through historic review if the property is a historic landmark, a contributing property in a local historic district, or a contributing property in a National Register historic district, for work that includes exterior alterations (Historic Review) ⁶. Applications, plans, photos and fees go through Austin Build + Connect. Small projects that qualify for administrative approval can be approved within five business days; larger projects go to the Historic Landmark Commission, which meets monthly ⁶.

The review page says historic landmarks and National Register districts use the city's Historic Design Standards, while local historic districts use their own district's design standards ⁶. The Historic Design Standards (November 2022) set out what reviewers look for in windows (Historic Design Standards) ⁷:

• Repair first. Repair historic windows rather than replace them unless they are deteriorated beyond stabilization or restoration, and retain windows if 50% or more of the wood or metal sash members are intact ⁷.
• Matching. If historic windows must be replaced, match the size and details, including configuration, profile and finish ⁷.
• Muntins. Where a window has divided lites, the replacement needs true divided lites or simulated divided lites with dimensional muntins on the outside of the glass; never use false muntins inside the glass ⁷.
• Openings. Do not enlarge, move or enclose historic openings highly visible from a front or side street ⁷.

The standards say staff may approve projects administratively if they meet the standards and do not affect the property's historic character from the street (district) or overall (landmark); otherwise the Historic Landmark Commission reviews them ⁷. Separately, the city's preservation page says the office reviews all exterior changes to buildings 45 years or older, with the goal of identifying potential landmarks; a permit application is routed to it internally, and a potentially significant property is referred to the Commission (Historic Preservation) ⁸. A homeowners association may have its own window rules; check them. Our article on historic home window replacement covers repair versus replacement in more depth.

Climate and glass

ENERGY STAR places Travis County in its Southern climate zone (ENERGY STAR climate zone finder) ¹⁰. There, ENERGY STAR's window criteria call for a U-factor of 0.32 or less and a solar heat gain coefficient (SHGC) of 0.23 or less, with air leakage of 0.3 cubic feet per minute per square foot or less (ENERGY STAR criteria) ⁹. ENERGY STAR is a voluntary label, separate from the city's energy code.

NOAA's 1991-2020 normals for Austin Camp Mabry show why heat gain matters most: a summer (June to August) average high of 95.9°F, about 123 days a year at 90°F or above, and about 12 nights at 32°F or below, with 3,289.9 cooling degree days against 1,442.4 heating degree days (NOAA normals, Austin Camp Mabry) ¹¹. Normal annual precipitation is 36.25 inches ¹¹. On west- and south-facing walls, the SHGC on the label is the number to compare. The articles on solar heat gain coefficient and low-E glass explain the ratings, and the energy-efficient windows explainer covers the rest.

What window replacement costs

None of the cost sources we use publishes a figure for Austin, 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) ¹². The window replacement cost guide sets the national surveys side by side.

Getting quotes in Austin

Ask every installer the same things: size for size or a changed opening, insert or full-frame installation, who registers and applies for the permit, whether the house needs historic review, and the NFRC values of each unit. 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: City of Austin Express Permits page (windows replaced size for size eligible, one business day for most permits, floodplain and historic district caveat, registered general contractor linked to the permit, homeowner as general contractor after registration, AB+C Portal, fees invoiced after intake review and not reimbursed if work exceeds the qualifications), checked October 26, 2026.
• ² Official record: City of Austin Work Exempt from Building Permits page (same-size doors and awnings up to 54 inches listed, windows not listed, exempt work must still comply with codes), checked October 26, 2026.
• ³ Official record: City of Austin Contractor Registration page (who must register, no state license required for a general contractor, trade licenses), checked October 26, 2026.
• ⁴ Official record: City of Austin Ordinance No. 20250410-038 (2024 IECC with local amendments, effective July 10, 2025; R503.1.1.1 replacement fenestration; Table R402.1.3(1) climate zone 2 existing-building maximums, U-factor 0.40 and SHGC 0.25; area-weighted average), checked October 26, 2026.
• ⁵ Official record: City of Austin Building Technical Codes page (2024 IECC listed among codes effective July 10, 2025), checked October 26, 2026.
• ⁶ Official record: City of Austin Historic Review page (who needs review, which design standards apply, Austin Build + Connect, administrative approval within 5 business days, monthly Historic Landmark Commission), checked October 26, 2026.
• ⁷ Official record: City of Austin Historic Design Standards, November 2022 (window standards 5.1 to 5.5, 50% sash rule, muntins, administrative versus Commission review), checked October 26, 2026.
• ⁸ Official record: City of Austin Historic Preservation page (review of exterior changes to buildings 45 years or older), checked October 26, 2026.
• ⁹ Official record: ENERGY STAR residential window criteria table (Southern U-factor 0.32, SHGC 0.23, air leakage 0.3 cfm per square foot), checked October 26, 2026.
• ¹⁰ Official record: ENERGY STAR county climate zone list (Travis County in the Southern zone), checked October 26, 2026.
• ¹¹ Official record: NOAA 1991-2020 normals for Austin Camp Mabry (summer average high 95.9°F, about 123 days at 90°F or above, about 12 days at 32°F or below, 3,289.9 cooling and 1,442.4 heating degree days, 36.25 inches of precipitation), checked October 26, 2026.
• ¹² Reported: Fixr national window replacement cost (about $800 per window, typically $450 to $1,200; updated January 21, 2026), checked October 26, 2026.