Lots.

Austin City Code tit. 25, ch. 25-4, art. 3, div. 3

in effect

Austin City Code § 25-4-171 ACCESS TO LOTS.

§ 25-4-171 - ACCESS TO LOTS. (A) Each lot in a subdivision shall abut a dedicated public street. (B) Chapter 25-6, Article 6 (Access to Major Roadways And In Certain Watersheds) governs access to a lot: (1) on a roadway designated as a major arterial, freeway, parkway, or expressway in the transportation plan or in a roadway plan approved by the appropriate county; or (2) on a Hill Country Roadway. Source: Section 13-2-424; Ord. 990225-70; Ord. 030306-48A; Ord. 031211-11.

Austin City Code § 25-4-172 THROUGH LOTS IN A SINGLE-FAMILY SUBDIVISION.

§ 25-4-172 - THROUGH LOTS IN A SINGLE-FAMILY SUBDIVISION. A through lot in a single-family residential subdivision is permitted if access to one of the abutting streets is prohibited. If one of the streets abutting a through lot is an arterial, access to the arterial is prohibited unless the director determines that topography or property size justify access to the arterial. Source: Section 13-2-431; Ord. 990225-70; Ord. 031211-11.

Austin City Code § 25-4-173 LOT ARRANGEMENT.

§ 25-4-173 - LOT ARRANGEMENT. The side lines of lots must be approximately at right angles to straight street lines or radial to curved street lines. An arrangement placing adjacent lots at right angles to each other may be disallowed by the director. Source: Section 13-2-432; Ord. 990225-70; Ord. 031211-11.

Austin City Code § 25-4-174 LOT SIZE.

§ 25-4-174 - LOT SIZE. (A) In the zoning jurisdiction, the site development regulations for the zoning district in which a lot is located determine minimum lot area and minimum lot width. (B) In the extraterritorial jurisdiction, residential lot requirements are as follows: (1) minimum lot area is: (a) in a subdivision served by a public wastewater system or central wastewater disposal unit: (i) 5,750 square feet; or (ii) 6,900 square feet for a corner lot; or (b) in a subdivision with private on-site sewage facilities, as determined by Texas Administrative Code Title 30, Chapter 285 (On-Site Sewage Facilities); (2) minimum lot width is: (a) 50 feet for an interior lot; (b) 60 feet for a corner lot; or (c) 33 feet for a lot on a cul-de-sac or curved street; and (3) minimum lot frontage, including a flag lot, is: (a) 20 feet; or (b) if a culvert is required for a driveway approach, 30 feet. (C) The director may reduce the minimum lot frontage prescribed by Subsection (B) if the director determines that access to the lot is restricted to a joint use driveway. Source: Section 13-2-433; Ord. 990225-70; Ord. 030306-48A; Ord. 031211-11.

Austin City Code § 25-4-175 RESERVED.

Austin City Code § 25-4-176 USEABLE AREA OF LOTS.

§ 25-4-176 - USEABLE AREA OF LOTS. The applicant shall demonstrate that all proposed duplex or single-family lots have usable lot area that can reasonably accommodate the assumed square footage of impervious cover established by Section 25-8-64 (Impervious Cover Assumptions). The usable lot area must account for all applicable waterway setbacks, floodplains, steep slopes, grade limitations, critical environmental features, protected trees, on-site sewage facilities, and other relevant code provisions. Source: Ord. No. 20230831-141, Pt. 39, 9-11-23.

Austin City Code § 25-4-177 FLAG LOTS.

§ 25-4-177 - FLAG LOTS. (A) In this section, SINGLE-FAMILY RESIDENTIAL means: (1) single-family attached residential use; (2) single-family residential use; and (3) small lot single-family residential use. (B) A flag lot may only be approved in accordance with the requirements of this subsection. (1) Except as provided in Subdivision (2), flag lot designs are permitted if the director determines that the subdivision conforms to the Fire Code, utility design criteria, Plumbing Code and requirements for access. (2) In single-family, duplex, two-unit, or three-unit residential subdivisions on previously unplatted land, (a) residential flag lot designs may be used where no more than two dwelling units utilize a shared driveway; and (b) residential flag lot designs with more than two units sharing a driveway may be used if the lots conform to the Fire Code, utility design criteria, Plumbing Code, and requirements for access. (C) Minimum Width of a Flag Lot. (1) Except as provided in Subdivision (2), the minimum width of a flag lot is: (a) 20 feet; or (b) 15 feet if: (i) two or more contiguous lots share a common driveway and sufficient area is available outside the drive on each lot for utility installation; (ii) the applicant can demonstrate access through an alternative route; or (iii) a driveway is not proposed. (2) The minimum width of a flag lot with at least one but no more than three dwelling units is: (a) 10 feet when: (i) sufficient area is available for utility installation; (ii) a driveway is not proposed; or (b) five feet when: (i) two or more contiguous lots share a common driveway or walkway and sufficient area is available for utility installation; or (ii) the applicant can demonstrate access through an alternative route. (D) For residential subdivisions utilizing a flag lot design, all driveways within the subdivision must be located and designed in a manner that: (1) provides adequate space for required utilities; (2) complies with the Utilities Criteria Manual; (3) complies with the Drainage Criteria Manual; (4) complies with the Fire Code; (5) complies with the Plumbing Code; and (6) complies with applicable tree preservation requirements detailed in the Environmental Criteria Manual. (E) All addresses for residential lots utilizing a flag lot design must be displayed at their closest point of access to a public street for emergency responders. Source: 20120524-139; Ord. No. 20190822-117, Pt. 36, 9-1-19; Ord. No. 20230831-141, Pt. 38, 9-11-23; Ord. No. 20240516-006, Pt. 8, 5-27-24.

Source: City of Austin, City Code and City Charter (Municode Library, library.municode.com)URL: https://library.municode.com/tx/austin/codes/code_of_ordinances?nodeId=TIT25LADE_CH25-4SU_ART3PLRE_DIV3LOFetched: 10/27/2026