Grand Prairie | Lot Size and Small Lots

Grand Prairie Lot Size and Small Lots: District Minimums, New Subdivisions and SB 15

In Grand Prairie, three sets of rules decide how big a house lot must be. Table 6A of the Unified Development Code (UDC) sets the minimum for each zoning district. Appendix W raises those minimums for new subdivisions of five or more lots. And since September 2, 2025, the UDC carries a small lot column for SB 15, the 2025 state law that caps lot sizes on large unplatted tracts. This page covers all three, plus the rules for older lots and how lots are laid out on a plat. The Grand Prairie overview has the summary.

Minimum Lots by District

Table 6A of Article 6 lists the area, width and depth every detached house lot must have, and the most homes allowed per acre. Lot coverage is the share of the lot covered by buildings, including accessory buildings and patio covers; driveways, uncovered patios and pools are left out. Sec. 6.3.1 says fractions are "rounded downward to the nearest whole number" when the City counts how many homes fit on a tract.

Source: Grand Prairie UDC Article 6, Table 6A (September 2, 2025, PDF page 22), read by the x position of each cell. Attached and townhouse lots are in Table 6B, on the townhomes and apartments page.

Table 6A adds three adjustments. Note 5 says lots "developed under Appendix W shall measure a minimum of 65 feet at the building line," which raises the SF-4 to SF-Z widths for new subdivisions. Sec. 6.5.1.E requires corner lots outside Appendix W to be 5 feet wider than the table, and Sec. 6.5.1.F requires key lots to be 10 feet wider. The UDC uses the term "key lot" without defining it in Article 30. Lots on a cul-de-sac or "eyebrow" may be up to 10 feet narrower or shallower, "but in no case may have less than 30 feet of width at the front lot line."

Floodplain land changes the math. Note 1 says a residential lot that reaches into a designated floodplain "shall have a minimum lot size of one (1) acre," or the floodplain part must be dedicated to the City as a Storm Water Management Area. On a creek lot, that can decide whether a split works at all.

Older Lots and Unplatted Tracts

Much of Grand Prairie was platted before the current tables. Sec. 6.5.1 protects those lots:

• The UDC "does not affect any duly executed, correct, recorded plat prior to its enactment," and a parcel platted before the UDC is exempt from new lot width, depth and area rules.
• A nonconforming lot of record is exempt from the Table 6A and 6B area, width and depth rules. Its side yards follow the lowest density district in which its width would conform.
• A building permit may be issued on unplatted land when three of five conditions apply: a recorded deed; a tract of at least 50 by 120 feet; a metes and bounds description in place since October 18, 1960; City taxes being assessed; or conformity with the district except for lot size.

Older lots also get a smaller house size. Under Sec. 6.4.1.A, a new house on a lot of record from before January 1, 1968 may have as little as 960 square feet of living area when more than half of the homes on both sides of the block miss the district minimum and more than half of the lots on the block are developed. Sec. 6.13.1 requires each house to front a public street or approved access, other than an alley, with at least 30 feet of frontage, but the 30-foot rule "shall not apply" to a legal lot of record.

New Subdivisions Under Appendix W

Appendix W, last updated November 4, 2025, sorts residential projects by size. New detached developments of five or more lots must meet Section 2. Developments of four or fewer lots, and redevelopment of five or more lots platted before the appendix, follow only the zoning district. Section 1.I.A says that where Appendix W and the rest of the UDC conflict, "the most restrictive standard shall apply."

Section 2.II.A sets the lot mix. A lot of 7,800 to 8,999 square feet "shall be required for a minimum of seventy percent (70%)" of the platted lots, and a lot of 9,000 square feet or more for at least 30 percent. Each lot must be 65 feet wide at the front building line, or 80 feet if it faces a "T" intersection, and no lot may cover more than 60 percent with buildings. In practice, a new detached subdivision in SF-6 must still use lots of 7,800 square feet or more, well above the 5,000 square foot district minimum.

• A mandatory homeowners association (HOA) or public improvement district (PID) must enforce the standards. A new PID needs at least 175 parcels when complete.
• Masonry screening walls at least 6 feet high run along arterial and collector streets, inside a common lot at least 10 feet deep.
• Each house gets two 3-inch trees in front and two more where the builder chooses, plus 30 gallons of shrubs.
• A subdivision that saves an average of 30 or more trees per acre may reduce the minimum lot size by 10 percent.
• The City Council, on a Planning and Zoning Commission recommendation, may vary lot width and size at zoning or platting when the builder adds the recommended design elements.

Small Lots Under SB 15

SB 15 added Subchapter D to Chapter 211 of the Local Government Code. It applies in a city of more than 150,000 people in a county of more than 300,000, and only to a tract that "will be platted and located in an area zoned for single-family homes," is "five acres or more," and "has no recorded plat." It does not apply within 3,000 feet of an airport or military base. A "small lot" is a residential lot of 4,000 square feet or less. The SB 15 page explains the statute.

Grand Prairie's code carries SB 15 rules in the Article 6 edition adopted September 2, 2025 by Ordinance No. 11756-2025. Article 30 defines a "Small Lot Development" with the same three tests. Sec. 6.1.5 says a small lot development of "four or fewer lots" follows the statute, and anything the statute does not cover follows the SF-6 district. Sec. 6.1.6 says a development of "five or more lots" follows the statute, then Section 3 of Appendix W. Table 6A gained a "Small Lot Development" (SLD) column, and Sec. 12.13.2 requires a "Small Lot Development Disclaimer" on every preliminary and final plat that lists the standards.

Source: Local Government Code 211.054 and 211.055 (SB 15); Grand Prairie UDC Table 6A, Appendix W Section 3, Sec. 12.13.2, Sec. 12.19.5 and the Article 10 parking schedule.

The City's documents give two rear yards. Table 6A and the plat disclaimer say "Minimum Rear Setback: 10 ft." Appendix W, Section 3.II.A, says "Minimum Rear Yard Setback 5 ft." Both are within the state cap of 10 feet. Because Appendix W says the most restrictive standard applies in a conflict, plan on 10 feet unless the Planning Division confirms 5. Table 6A also keeps a 1,000 square foot minimum house size in the SLD column, a rule SB 15 does not mention.

Small lot subdivisions of five or more lots carry the same design package as large-lot subdivisions: curving streets or traffic calming, a mandatory HOA or PID, masonry screening walls along arterials, a monument entry, and one 3-inch tree plus 30 gallons of shrubs per lot. Sec. 12.19.5 requires "a minimum thirty-one (31) foot wide street with an alley," and the Article 10 parking schedule asks for "1 Off-Street Parking Space Accessed from Rear Loaded Alley." SB 15 bars "any other zoning restriction that imposes restrictions inconsistent with" its list, while Section 211.056 keeps a city's power over rules that apply to "all similarly situated lots or subdivisions." Section 6 of Appendix W says a provision that cannot be read to comply with state law "shall not be enforced." Where a design rule and the statute meet, the statute controls; ask the City which rules it will apply to your plat.

How Lots Are Laid Out on a Plat

Section 17 of Article 12 adds layout rules to the size minimums. "No lot shall be approved which does not meet the minimum requirements, and does not provide an adequate building envelope," and lots with easements across the buildable area may need extra width or depth.

• Each lot "shall face on a public street"; the Director may accept a recorded mutual access easement instead.
• Side lot lines run at right angles, or radial, to the street, and the rear of a lot must be at least 10 feet wide.
• Blocks may be up to 1,200 feet long and "should not be less than five hundred (500) feet in length."
• Lots should have a depth to width ratio of "generally not more than two and one-half (2 1/2) to one and in no case more than four (4) to one."
• A lot may be enlarged by a final plat, provided no leftover piece is smaller than the district minimum.

Owners of two or more adjoining lots platted by the City before January 2, 2007 may build one structure across the shared lot line without a replat, under Sec. 6.14. After that, the lots may not be sold apart until they are replatted. The plats, permits and fees page covers the plat process and the fees.

Where to Go Next

Related on VanPlex: the Grand Prairie overview, SB 15 small lots and how Texas zoning works.

Frequently Asked Questions

Official sources (checked October 2026)