What is the minimum lot size for a house in Houston?
In Houston, the minimum lot size for a new single-family subdivision plat is 3,500 square feet within the city limits, or 5,000 square feet in the extraterritorial jurisdiction. A plat can go below that baseline only by meeting the compensating open space standards of Sec. 42-182, or, for a plat within the city, the performance standards of Sec. 42-184 — those are the only two routes down. Even then, no lot may be smaller than 1,400 square feet unless the property is within the city and every lot in the subdivision takes vehicular access from a shared driveway or permanent access easement, with the average lot size across the subdivision — and across each full blockface — held at or above 1,400 square feet. That average is capped, not raw: Sec. 42-181(c)(2) counts any lot larger than 3,500 square feet as 3,500, so a few oversized lots cannot lift the average for the rest, and Sec. 42-181(c)(5) carries the same average forward to every later replat, with a plat notation saying so. A city-designated special minimum lot size area can override all of these citywide numbers.
Applies toNew single-family residential subdivision plats in Houston with wastewater (sewer) collection service, both inside the city limits and in the city's extraterritorial jurisdiction (ETJ). Courtyard-style developments (Sec. 42-194), lots without wastewater collection service (Sec. 42-180(b), Sec. 42-181(d)), and any block or area with its own special minimum lot size designation (Sec. 42-197 et seq.) follow different rules and are not covered by the numbers on this page.
What the code says
(a) The minimum lot size for a single-family residential lot with wastewater collection service shall be as shown below, except for lots within courtyard style development meeting the requirements of section 42-194: (1) 5,000 square feet for a lot within the extraterritorial jurisdiction; or (2) 3,500 square feet for a lot within the city.
Houston Code of Ordinances — Single-family residential lot size — §42-181(a)
· Read the full code
Common questions
Can Houston allow a smaller lot than 3,500 square feet?
Yes. Within the city, a subdivision plat can go below 3,500 square feet — down to an average of 1,400 square feet — by meeting the compensating open space standards of Sec. 42-182 or the in-city performance standards of Sec. 42-184. Even then, no individual lot may go below 1,400 square feet unless the property is within the city and ALL lots in the subdivision take vehicular access from a shared driveway or permanent access easement, with the overall lot-size average staying at or above 1,400 square feet — an additional requirement on top of the Sec. 42-182/42-184 reduction, not a separate route to it. Run that average the way Sec. 42-181(c)(2) requires: a lot larger than 3,500 square feet counts as 3,500 for the calculation. A plat that clears 1,400 on a raw average may fail on the capped one, which is the only one that counts. And the obligation does not end at recordation: where a plat includes any lot under 3,500 square feet, Sec. 42-181(c)(5) requires every subsequent replat of a lot in it to keep the average at or above 1,400 — measured across all lots in the ORIGINAL plat, not the replat — and requires the plat and each subsequent replat to carry a notation stating that requirement.
Does a lot outside Houston city limits follow the same minimum?
No. A lot in the extraterritorial jurisdiction (ETJ) has a 5,000-square-foot minimum under Sec. 42-181(a)(1), instead of the 3,500-square-foot in-city minimum. Sec. 42-184's in-city performance-standards path is limited to lots inside the city, but the compensating open space path in Sec. 42-182 has its own schedule for the ETJ too — it just requires more open space per lot than the equivalent in-city reduction.
This is how the code reads; confirm with the city — or ask a builder who's actually pulled this permit in Houston.
The authoritative text is the
Houston Code of Ordinances;
permitting questions go to
Houston Permitting Center.