Houston | Lot Size and Small Lots
Houston Lot Size and Small Lot Rules: 3,500 and 1,400 Square Feet
Houston has no zoning code, so lot size is set by Chapter 42 of the City code, the chapter on subdivisions and plats. A plat is the recorded map that divides land into lots. This page covers Article III, Division 4 of that chapter, Sections 42-180 to 42-194, and the shared driveway rules in Division 2 that small-lot plats rely on. Each number below names the section that sets it. The Houston overview gives the short version.
Houston lot size in six facts
- A single-family lot with sewer service must be at least 3,500 square feet inside the city of Houston and 5,000 square feet in its extraterritorial jurisdiction (ETJ). Source: Houston Code, Sec. 42-181
- Inside the city, a plat can use lots under 3,500 square feet, down to an average of 1,400, when more than 60 percent of each small lot stays uncovered by buildings. Source: Houston Code, Sec. 42-184
- Small-lot plats are capped at 27 homes per gross acre, or 35 when every lot takes vehicle access from the rear or side. Source: Houston Code, Sec. 42-184
- A lot must be at least 20 feet wide, or 15 feet inside the city when every lot uses a shared driveway or permanent access easement and the average width is 18 feet or more. Source: Houston Code, Sec. 42-185
- A flag staff must be at least 16 feet wide, may serve no more than 4 lots, and may run no more than 200 feet from the street together with the driveway. Source: Houston Code, Sec. 42-187
- A shared driveway must be at least 18 feet wide, or 12 feet when the subdivision has no more than six homes, is no more than 150 feet deep, and sets garages back for turning. Source: Houston Code, Sec. 42-145 and 42-146
What Chapter 42 Calls a Lot
Sec. 42-1 defines a lot, on a subdivision plat, as "an undivided tract of land intended for single-family residential use." Land for any other use is a reserve. Sec. 42-190 says a tract that is "not restricted to single-family residential use shall not be designated on a subdivision plat as a lot." So the lot rules on this page apply to houses, duplexes and townhomes. Sites for three to eight homes in one building group follow the reserve rules on the three to eight units page.
Sec. 42-180 lists what every lot must do. It must be large enough for a single-family building that meets the City code, hold an easement for the utilities that serve it, and have direct vehicle access from a street, a shared driveway or an alley. An easement is a recorded right to use part of the land for a set purpose, such as a power line. A narrow lot may have no more than one vehicle access from a street. Sec. 42-1 defines a narrow lot as one with less than 44 feet of frontage, which is the length of the lot along the street.
A lot with no sewer service follows another rule. Sec. 42-180(b) requires it to meet the minimum requirements of the Texas Commission on Environmental Quality, and the applicant must provide a letter from that agency.
The Base Sizes: 3,500 and 5,000 Square Feet
Sec. 42-181(a) sets the minimum size for a single-family lot "with wastewater collection service," which means a lot connected to a sewer: 3,500 square feet inside the city and 5,000 square feet in the extraterritorial jurisdiction (ETJ). Sec. 42-1 defines the ETJ as "the unincorporated territory extending beyond the corporate boundaries of the city." The City applies its plat rules there.
Lots in a courtyard style development are exempt from the base size. Two other ways allow a smaller lot. Sec. 42-181(b) allows smaller lots when the plat meets the compensating open space schedule in Sec. 42-182, or, for land inside the city, the performance standards in Sec. 42-184. A performance standard is a set of conditions the plat must meet in exchange for the smaller size.
One rule overrides all of these. Sec. 42-181(e) says a special minimum lot size set by City Council for a block or area "shall control over all other provisions of this section." The deed restrictions and minimum lot size areas page explains how those are set.
Route One: Compensating Open Space
Compensating open space is shared land set aside inside the plat so that the lots can be smaller. Sec. 42-182 gives a schedule. The left column is the average lot size the plat wants to reach, and the other two columns are the open space the plat must provide for each lot.
| Average lot size | Open space per lot, city | Open space per lot, ETJ |
|---|---|---|
| 4,999 to 4,500 sq ft | None | 100 sq ft |
| 4,499 to 4,000 sq ft | None | 200 sq ft |
| 3,999 to 3,500 sq ft | None | 300 sq ft |
| 3,499 to 3,000 sq ft | 240 sq ft | 400 sq ft |
| 2,999 to 2,500 sq ft | 360 sq ft | 500 sq ft |
| 2,449 to 2,000 sq ft (as the code prints it) | 480 sq ft | 600 sq ft |
| 1,999 to 1,400 sq ft | 600 sq ft | 720 sq ft |
Source: Houston Code of Ordinances, Sec. 42-182, Supplement 93 Update 1.
The sixth row reads 2,449 to 2,000 in the code, while the row above it ends at 2,500. The printed schedule therefore gives no amount for an average lot of 2,450 to 2,499 square feet. Ask the Planning and Development Department which amount it applies before you design to that range.
Sec. 42-183 sets what counts as open space. Lots, building sites, carports, garages, driveways, private roadways and streets are excluded, and so are private medians less than 12 feet wide. Detention ponds, floodplains and ravines are excluded unless the Planning Commission approves an open space amenities plan under Sec. 42-192. The land must be "reasonably dry and flat." Each area must be at least 240 square feet, with dimensions of 20 feet by 12 feet. It must be reserved for the owners and residents of the subdivision, open to all of them, and owned and maintained under a binding agreement among the owners.
Route Two: Performance Standards Inside the City
Sec. 42-184 is the second route. It applies only to land inside the city, and the plat must include notes that require each standard.
| Standard in Sec. 42-184 | Number |
|---|---|
| Share of each small lot left uncovered by buildings | More than 60 percent |
| Same share when the plat only replats one corner lot at two public streets | More than 75 percent |
| Permeable area on each small lot | At least 150 sq ft |
| Homes per gross acre | No more than 27 |
| Homes per gross acre when every lot takes access from the rear or side by an alley, flag staff, shared driveway or permanent access easement | No more than 35 |
| Lowest average lot size | 1,400 sq ft |
Source: Houston Code of Ordinances, Sec. 42-184, as amended by Ord. No. 2023-801, effective November 27, 2023.
A gross acre counts all land inside the plat boundary. The City's Livable Places user guide shows what the two density limits mean on a 5,000 square foot site. Its Small-Lot Concept 1 puts three homes on a 50 by 100 foot site of 5,000 square feet and lists the density as 26 homes per acre. Its Second Dwelling Unit Concept 6 splits a site of the same size into two alley-access lots with four homes in total and lists 35 per acre.
Sec. 42-181(c) adds the rule for the smallest lots. A plat may include a lot under 1,400 square feet only when the land is inside the city, every lot takes vehicle access from a shared driveway or permanent access easement, and the average lot is 1,400 square feet or more. A lot larger than 3,500 square feet counts as 3,500 in that average. When the plat covers a whole blockface, each blockface must also average 1,400. A blockface is the part of a block that faces one street between two cross streets.
Lot Width and Where the Driveway Goes
Sec. 42-185 sets a minimum lot width of 20 feet along a street or shared driveway. Inside the city the width may be 15 feet when all lots take access from a shared driveway or permanent access easement and the average width of all lots is at least 18 feet. A lot wider than 30 feet counts as 30 feet in that average.
Sec. 42-188 then decides where vehicles enter. Its rules in subsections (d) through (h) apply only inside the city. Land being subdivided that touches an alley maintained by the City or a homeowners association must take vehicle access from the alley, unless the director of the Planning and Development Department finds the alley cannot be used. A single corner lot must take access from the side street. In the middle of a block with no usable alley:
- a lot 44 feet wide or more must leave at least 20 feet of its frontage as curb space with no driveway, and at least one third of the width of the wall facing the street must be "occupiable space," a term the City Construction Code defines;
- a narrow lot must take access through a flag staff, a shared driveway or a permanent access easement;
- on a property of 15,000 square feet or less, a lot 33 feet wide or more but under 44 feet may have its own driveway from the street, no wider than 12 feet.
Sec. 42-188.5 covers lots that were already narrower than 33 feet. Such a lot may have direct driveway access when it was platted under 33 feet, or was too narrow to split into equal lots of 33 feet, before September 27, 2023, and when it meets five more conditions. It has no usable side or rear access. Each lot has one driveway approach of no more than 12 feet. The garage building line is at least 20 feet. The land is not within 1,400 feet walking distance of the main entrance of a primary or secondary school. The land is outside the areas the City maps as a Complete Community.
The City's Livable Places FAQ describes the narrow lot rule as a shared driveway with "one entrance of not more than 16 feet wide." The code states shared driveway widths as minimums of 18, 16 or 12 feet, shown in the next table. Where the two differ, the code controls.
Shared Driveways and Flag Lots
Sec. 42-1 defines a shared driveway as "a private roadway" that "provides access to two or more single-family residential lots through appropriate cross-access easements." Sec. 42-145 allows one only on a plat inside the city. A flag lot reaches the street through a narrow strip called the flag staff, which more than one lot uses for vehicle access.
| Rule | Number | Section |
|---|---|---|
| Standard shared driveway width | At least 18 feet | Sec. 42-145(a)(1) |
| Width with no more than six homes, a subdivision no more than 150 feet deep, and garages set back for turning | At least 12 feet | Sec. 42-146(a) |
| Width for a driveway of 100 feet or less with no turns except a "T" turnaround that meets the conditions in the section | At least 16 feet | Sec. 42-146(b)(1) |
| Longest distance from any part of the shared driveway to the public street | 200 feet, measured along the centerline | Sec. 42-145(a)(2) |
| Longest private driveway that connects a lot to the shared driveway | 20 feet | Sec. 42-145(a)(4) |
| Distance from the plat boundary where it meets the public street | At least 4 feet | Sec. 42-145(b)(3) |
| Emergency access strip along each plat boundary that does not touch a public street | 3 feet wide | Sec. 42-145(d) |
| Flag staff width | At least 16 feet | Sec. 42-187(b) |
| Lots on one flag staff | No more than 4 | Sec. 42-187(a) |
| Flag staff plus driveway length | No more than 200 feet from the street | Sec. 42-187(d) |
Source: Houston Code of Ordinances, Chapter 42, Article III, Division 2, Subdivision B and Sec. 42-187.
The 200-foot limit on a shared driveway does not apply when every lot on it also has frontage, at the minimum lot width, on a public street with a roadway. A shared driveway must meet a public street that has a roadway at a 90-degree angle. It may not connect to a shared driveway from the next subdivision. Each garage door must be parallel to the length of the shared driveway. One lot may have a garage door perpendicular to it when no more than six lots use the driveway, the driveway is 100 feet long or less, and it does not meet a major thoroughfare or collector street.
A replat is a new plat that changes an earlier recorded one, and a right-of-way is the full strip of public land that holds a street. A major thoroughfare is a street the City lists on its major thoroughfare and freeway plan, and a collector street moves traffic between major thoroughfares and other streets.
Buildings sit close to a shared driveway. Under Sec. 42-159, the building line is 3 feet on each side of a shared driveway that is 18 feet wide or more, and 4 feet for a garage or carport on a narrower one. A building line is the required distance between a building and a street or driveway. Lots on a permanent access easement, which is a privately owned and maintained street easement that the Planning Commission approves, must belong to a homeowners association or similar body with power to charge owners for upkeep (Sec. 42-188(c)).
Parking Counted Lot by Lot
Sec. 42-186 sets parking on each lot: two off-street spaces for each home, or one for a home of 1,500 square feet or less. A home of 1,000 square feet or less needs none when the lot has less than 33 feet of public street frontage, the whole front of the home is occupiable space, and the plat and building permit show that no driveway from the street is allowed.
Guest parking is counted in addition. A plat inside the city with a shared driveway, courtyard access drive or type 2 permanent access easement (a private street easement at least 28 feet wide) and six or more homes must provide one more space for every six homes. That space may not sit inside the shared driveway or inside a lot, and it must be at least 20 feet from the right-of-way of a major thoroughfare. The parking and building lines page has the full table.
What the Planning Commission Cannot Change
The Planning Commission can grant a variance, which is permission to depart from a rule, and a special exception, which is a smaller adjustment to a standard in Article III. Both have limits that matter for small lots. Sec. 42-82(e) says the Commission "shall not grant a special exception" to lot size requirements, compensating open space requirements, building line requirements or performance standards. Sec. 42-81(a) says it "shall not consider or grant a variance from the performance standards or definitions of this chapter." Plan a small-lot plat to meet every number in Sec. 42-184.
The same limit applies to a later replat. When a plat includes a lot under 3,500 square feet, Sec. 42-181(c)(5) requires any later replat of a lot in it to keep the average at 1,400 square feet or more, counted across all lots in the original plat. The plat and each replat must include a note that says so.
Best For
- ✓ Land inside the city limits with no deed restriction or special minimum lot size on the block.
- ✓ A tract deep enough for a shared driveway of 18 feet, or 12 feet with six homes or fewer.
- ✓ A corner or alley site where every lot can take access from the rear or side, which allows 35 homes per gross acre.
Usually Fails When
- ✕ The land is in the ETJ, where the base lot is 5,000 sq ft and Sec. 42-184 does not apply.
- ✕ Buildings would cover 40 percent or more of a lot under 3,500 sq ft.
- ✕ A new mid-block lot under 33 feet wide has no alley, shared driveway, flag staff or access easement.
What To Verify Before Spending Money
- → Whether the tract is inside the city or in the ETJ.
- → The width of every lot and the average width, with lots over 30 feet counted as 30.
- → Whether the block has a special minimum lot size or recorded deed restrictions.
Where to Go Next
Related on VanPlex: the Houston overview, the state law on small lots under SB 15, and how Texas zoning works.
Frequently Asked Questions
How many townhomes fit on a 5,000 square foot lot in Houston?
What is compensating open space in a Houston subdivision?
How narrow can a townhome lot be in Houston?
What is a flag lot under Houston Chapter 42?
How wide does a shared driveway have to be in Houston?
Can I plat small lots in the Houston ETJ?
How much of a small lot in Houston must stay open?
Can the Houston Planning Commission waive the lot size rules?
Does every lot in Houston need its own driveway to the street?
What happens when one lot in a Houston small-lot subdivision is replatted later?
Official sources (checked October 2026)
Planning a multiplex in Houston?
VanPlex builds multiplexes in British Columbia, Canada. For a lot in Houston, our team makes a custom proforma by hand and emails it to you in 24 to 48 hours.
Get a proforma for your address