Fort Worth | Lot Size and Small Lots
Fort Worth Lot Size Rules: District Minimums, Lot Splits, Infill Platting and SB 15 Small Lots
Before a Fort Worth owner can split a lot or plan a small-lot subdivision, two sets of rules apply. The zoning district sets the smallest lot area and width. The Subdivision Ordinance sets how lots are drawn on a plat, the recorded map that creates legal lots. In 2026 the City added two changes: Small Lot Housing under SB 15, and looser layout rules for infill lots in older areas. This page covers all of them. The Fort Worth overview gives the short version.
Fort Worth lot rules in six facts
- An A-5 lot needs 5,000 square feet and 50 feet of width; A-7.5 needs 55 feet and A-10 needs 60 feet. Source: Board of Adjustment agendas, 2026
- Ordinance No. 28525-05-2026, in force May 22, 2026, allows Small Lot Housing of 3,000 to 4,000 square feet in all seven one-family districts. Source: Ordinance No. 28525-05-2026
- Small Lot Housing applies only on a tract of five acres or more that has no recorded plat and will be platted in a one-family area. Source: Ordinance No. 28525-05-2026, Sec. 6.509(b)
- A final short plat may create four or fewer lots on an existing public street with no preliminary plat. Source: Subdivision Ordinance, Sec. 31-42
- Since February 24, 2026, infill lots inside or within one mile of Interstate 820 and Interstate 20 and platted before 2000 get looser layout rules, including shared access for more than two lots. Source: Infill subdivision ordinance and Council record
- A lot smaller than its district minimum needs a Board of Adjustment variance, which since 2025 needs nine of eleven votes. Source: Ordinance No. 28121-11-2025
Minimum Lot Size and Width by District
The City's district summary gives the minimum lot area for each one-family and two-family district. The widths below come from Board of Adjustment agendas, which quote the rule each case asks to change. Lot width is measured at the building line, the line the house front may not cross.
| District | Minimum lot area | Minimum lot width |
|---|---|---|
| A-2.5A | 2.5 acres | Not in the documents read |
| A-43 | 1 acre | Not in the documents read |
| A-21 | One-half acre | Not in the documents read |
| A-10 | 10,000 sq ft | 60 ft |
| A-7.5 | 7,500 sq ft | 55 ft |
| A-5 | 5,000 sq ft | 50 ft |
| AR | 3,500 sq ft (zero lot line) | Not in the documents read |
| B | 5,000 sq ft (two attached); 7,500 sq ft (two detached) | 50 ft |
| R1 | 3,000 sq ft detached; 2,500 sq ft zero lot line | Not in the documents read |
| Small Lot Housing (SB 15) | 3,000 sq ft minimum, 4,000 sq ft maximum | 30 ft at the building line |
Source: zoning district summary (Rev. 5/26/26); widths from Board of Adjustment agendas of February 18, March 18, April 15 and September 16, 2026; Small Lot Housing from Ordinance No. 28525-05-2026.
The Subdivision Ordinance, Chapter 31 of the City Code, ties plats to these numbers. Sec. 31-103(a)(1) says: "No residential lot shall be of less width, at the building line, nor less total lot area than required by the zoning district regulations governing the plat." Sec. 31-103(b)(1) adds that no lot may be shaped so that it misses the zoning minimums. The City's Zoning 101 slides put the order plainly: "Before land is developed in the city, it must be zoned and platted."
Splitting a lot. By VanPlex arithmetic, an A-5 lot needs at least 10,000 square feet and 100 feet of width at the building line to become two legal lots without a variance, and an A-7.5 lot needs 15,000 square feet and 110 feet. The split also needs a plat, covered under the plat types below.
When a Lot Is Too Small: Board Variances
Many older Fort Worth lots are narrower than today's minimums. An owner who wants to build on one, or to redraw a lot line, asks the Board of Adjustment for a variance, a permission to depart from a written standard on one property. The Board's agendas show how common these requests are in the A-5 district:
- August 20, 2025: 1404 Arizona Avenue asked "to allow a 4,448 square foot lot"; 1517 Avenue D asked "to allow a 40-foot-wide lot" of 4,400 square feet; and 1840 E. Broadway asked "to allow a 42-foot-wide lot."
- March 18, 2026: requests for lot widths of 41 feet on Mount Horum Way, 43.05 feet on Amanda Avenue and 47.85 feet on Willie Street, against the "Minimum Required Lot Width 50 feet."
- September 16, 2026: two B district requests to allow "less than the required 50-foot lot width" and "less than the required 5,000 square feet lot area."
The test. Ordinance No. 28121-11-2025 rewrote Sec. 3.403. The Board may grant a variance only when "Literal enforcement of the regulations in this Zoning Ordinance will create an unnecessary hardship or practical difficulty," the situation "is unique to the affected property," it "is not self- imposed," the relief "will not injure the existing or permitted use of adjacent conforming property," and the variance is "in harmony with the spirit and purposes" of the ordinance. The Board may also weigh whether compliance "would result in a loss to the lot on which the structure is located of at least 25 percent of the area on which development is authorized to physically occur." Those extra grounds come from HB 1475 of 2021.
The vote. The same ordinance cut the Board to "eleven regular members and four alternate members" and says "The affirmative vote of nine members of the Board of Adjustment shall be required" to grant a variance. Owners within 300 feet get written notice at least ten days before the hearing. The fee for an owner-occupied home is $591, plus $296 for each added variance in the same application; for "other residential" property it is $886. The City lists 1.5 months to process a variance.
The signed copy of Ordinance No. 28121-11-2025 posted on the City's Zoning page reads "ADOPTED: October 21, 2025" and "EFFECTIVE: December 5, 2025." The Council's own record shows the ordinance adopted on November 11, 2025, by a 10 to 0 vote. VanPlex reports both dates as printed.
Plat Types for New Lots
Sec. 31-42 sets the plat a project needs. A preliminary plat goes to the City Plan Commission first, but "A preliminary plat is not required if there is no dedication or construction of public or private streets required for access and if four or fewer lots are to be platted." In that case a final short plat can be used. It is "permitted for four or fewer lots that have not been previously platted and recorded," "All lots on the final short plat must have direct access to and front or abut an existing public street," and "All lots must meet the lot size requirements of the zoning district in which they are located." Land that is already platted is redrawn with a replat; the plats and fees page covers replat notice and fees.
Flag lots. A flag lot, or panhandle lot, is a lot whose narrow strip reaches the street and then widens behind other lots. Sec. 31-103(c) says "Flag lots are expressly prohibited" unless the layout is needed to fix an access problem "not created by the applicant," steep land, or an odd neighboring boundary. With a waiver from the Commission, "The lot width is not less than 40 feet in width at its frontage connection" and the panhandle "does not exceed 100 feet in length." The rule also bars more than two adjacent panhandle lots from connecting.
Outside the city. In the extraterritorial jurisdiction (ETJ), the band of land outside the city limits where Fort Worth reviews plats but has no zoning, lots under 10,000 square feet must be at least 50 feet wide and larger lots at least 100 feet wide unless a waiver is granted for a flag lot.
The 2026 Infill Platting Rules
On February 24, 2026 the Council voted 9 to 0 for M&C 26-0122 and Ordinance No. 28336-02-2026, which added "Infill Development" rules to the Subdivision Ordinance. The Council communication says the changes aim to "help promote innovation through design of alternative housing options to help promote missing middle housing." Missing middle housing means homes between a house and an apartment block, such as duplexes, townhouses and small courts.
Where infill rules apply. The ordinance text attached to the Council record defines infill development as land in the Downtown urban design overlay, "Any Urban Residential (“UR”) zoning district or any form-based zoning district," "Any federally or locally designated historic district," property "within a quarter mile of Frequent Transit," or property inside or within one mile outside Interstate 820 and Interstate 20 that "was platted or considered to be a legal lot of record prior to January 1, 2000." The Development Services Director makes "the final determination."
What changes for infill lots:
- Lot lines. Existing conditions "can allow for lot configurations where lot lines are not perpendicular with street centerline." In other subdivisions lot lines must still meet the street at a right angle.
- Lot fronts. One- and two-family infill lots may face "a public or private street, alley, public or private access easement, or a separately designated lot" owned by a property owners' association, and "shared access may be provided to more than two lots."
- Walkways. Access to the lots may be "a minimum 5-foot paved surface on a designated private lot or private easement of common ownership."
- Blocks. Block length and perimeter limits "do not apply to Infill Developments that are less than 2 acres," except in UR, form-based and H districts.
- Corner clips. The corner land a plat gives the City at a street corner shrinks from ten by ten feet to five by five feet for infill.
Narrow lots and alleys. For any residential lot "less than 50 feet in width at the building line," driveway access from most streets must come from the rear, by an alley or a shared driveway on the common lot line. For infill, "A single lot of residential Infill Development that is less than 50 feet in width at the building line may have driveway access at the front of the lot if the lot previously had driveway access at the front." An infill project on more than half a block of such lots must build "a public alley built to City standard" unless shared driveways are used; for less than half a block the director may waive the alley. Where an alley is built, the part outside the project may be an interim alley "strong enough to support a single axle with a load of 10,000 pounds or more."
Two documents disagree. The Council communication summarizes infill as development "inside of or within one-mile outside of Loop 820," while the ordinance text names Interstate 820 and Interstate 20. The communication defines frequent transit to include rail routes "that run every thirty minutes or less," while the ordinance glossary reads "all passenger rail stations." The ordinance text controls. The attached copy is the unsigned version with blank adoption lines; the ordinance number comes from the Council record.
Small Lot Housing Under SB 15
SB 15 (2025) added Local Government Code 211.051 to 211.058. It applies in a city of more than 150,000 people that is wholly or partly in a county of more than 300,000. Fort Worth had 918,915 people in the 2020 Census and Tarrant County had 2,110,640, so it is covered by VanPlex count. Fort Worth answered with Ordinance No. 28525-05-2026, adopted May 12, 2026 and in force May 22, 2026. It added "Small Lot Housing" as a use in all seven one-family districts and wrote new Sec. 6.509.
Where it applies. Sec. 6.509(b) allows small lot housing only on a tract that "will be platted and located in an area zoned for one-family residential," "is five acres or more," and "has no recorded plat." Sec. 6.509(c) keeps it out of land within "3,000 feet of an airport or military base," within 15,000 feet of a military base boundary in a designated clear zone and accident potential zone, and in an area under a City agreement that does not provide for small lots. The City's August 2025 briefing put it this way: "Every zoning district that allows single family can have a lot size as small as 3,000 square feet (equivalent to R1) on an unplatted parcel that is at least 5 acres." The statute also excludes land near a large law enforcement training center in a county of 2,600,000 or more; the Fort Worth rule does not repeat it, and Tarrant County's 2020 count of 2,110,640 is below that line.
| Rule | State limit (LGC 211.054, 211.055) | Fort Worth Sec. 6.509 |
|---|---|---|
| Lot width | No more than 30 ft may be required | 30 ft minimum at building line |
| Lot depth | No more than 75 ft may be required | 75 ft minimum |
| Lot area | No more than 3,000 sq ft may be required | 3,000 sq ft minimum; 4,000 sq ft maximum |
| Front yard | No more than 15 ft | 15 ft minimum |
| Side yard | No more than 5 ft | 5 ft minimum; fire and building codes apply |
| Rear yard | No more than 10 ft | 10 ft minimum |
| Open space or lot coverage | No more than 30 percent open or permeable | 70 percent maximum lot coverage |
| Stories | May not require fewer than three full stories of up to 10 ft each | 3 stories maximum, up to 10 ft floor to ceiling |
| Parking | No more than one space per unit; no covered parking | 1 space per unit; no front yard driveway or parking |
Source: Ordinance No. 28525-05-2026, Sec. 6.509(d); Local Government Code 211.054 and 211.055, added by SB 15. The state rules apply to lots of 4,000 square feet or less.
Sec. 6.509 also says "The Development Standards in Section 6.101 shall not apply" to the front and side yards, so general yard rules such as the one that matches a front yard to the neighbors do not add to them. It allows fences "Eight feet high behind front yard," limits each unit to "one garage, one carport, or one porte- cochere," and requires front walls that follow Sec. 4.708 "except no wall articulation requirements." Wall articulation means required jogs or breaks in a long wall. The staff report noted that the no-front-driveway rule was "already applicable to residential lots less than 50-feet wide."
How it compares with the statute. Each Fort Worth number equals the state limit, so VanPlex found no conflict on lot size, yards, coverage or parking. On height, the statute bars a rule requiring "fewer than three full stories not exceeding 10 feet in height measured from the interior floor to ceiling"; Fort Worth writes the same words as a cap of "3 stories maximum." The statute controls if the two are ever read differently.
Two labeling errors in City documents. The City's Zoning Ordinance page lists the SB 15 ordinance under number "22335," but the signed copy is "ORDINANCE NO. 28525-05-2026." The ordinance's preamble cites the Council's August 26, 2025 compliance resolution as "Resolution No. 25-5356," while the SB 840 ordinance cites the same date as "Resolution No. 150-08-2025." The signed ordinance numbers control.
House Design on New Lots
A row of new houses on split or small lots also meets Fort Worth's anti-repetition rule. Sec. 6.507, rewritten by Ordinance No. 23430-09-2018, says "elevations for one- family dwelling units within a six ( 6) lot pattern must be sufficiently differentiated from each other and from any one- family dwelling unit that is two ( 2) lots removed on either side of the subject property on the same side of the street." The City's permit checklist accepts either one listed difference, such as a "Different number of full stories" or a "Side-loaded garage," or three smaller ones from a list that includes a roofline change across half the front, a porch of at least four feet deep, or different front materials on half the wall. The checklist lists paint color and mirrored plans among changes it will not consider.
Best For
- ✓ An A-5 lot of 10,000 sq ft or more with 100 ft of frontage, split by a final short plat into two legal lots.
- ✓ A new single-family tract of five acres or more with no recorded plat, outside airport zones, using Small Lot Housing.
- ✓ An older lot inside Interstate 820 platted before 2000, where the infill rules allow shared access and narrow lots.
Usually Fails When
- ✕ A split leaves a lot under 50 feet wide in A-5 and the hardship is self-made.
- ✕ The plan uses Small Lot Housing on a lot that is already platted or on a tract under five acres.
- ✕ A narrow-lot project covers more than half a block and has no alley or shared driveways.
What To Verify Before Spending Money
- → Lot width and area on the recorded plat and a survey, at the building line.
- → Whether the Development Services Director classes the site as infill development.
- → Distance to the Alliance, Meacham and Spinks airports and to NAS JRB before relying on SB 15.
Where to Go Next
Related on VanPlex: the Fort Worth overview and SB 15 and small lots.
Frequently Asked Questions
What is the minimum lot size in Fort Worth A-5 zoning?
Can I split my Fort Worth lot into two lots?
Does SB 15 let me build on a 3,000 square foot lot in Fort Worth?
Where is Small Lot Housing not allowed in Fort Worth?
How many parking spaces does a Fort Worth small lot home need?
What is an infill development under the Fort Worth subdivision rules?
Do narrow lots in Fort Worth need an alley?
Does Fort Worth allow flag lots?
How does the Fort Worth Board of Adjustment decide a lot variance?
Can I build the same house plan on two lots next to each other in Fort Worth?
Official sources (checked October 2026)
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