Cities | Corpus Christi

Corpus Christi Multiplex Rules 2026: Duplexes, ADUs and Coastal Rules

Corpus Christi zones every lot inside its city limits, so the first question for any project is the lot's district. One document holds the zoning and plat rules: the Unified Development Code (UDC), which the City publishes on enCodePlus. Fees and the flood code sit in Chapter 14 of the separate Code of Ordinances. On the coast, flood, windstorm and Navy airfield rules add a second layer. This page gives the main numbers, with the section for each, and links to seven detailed pages.

Corpus Christi Guide Pages

State Law in Corpus Christi, in Brief

Corpus Christi had 317,863 people in the 2020 Census, and Nueces County had 353,178, so Corpus Christi passes the size test in the 2025 laws, by VanPlex count from 2020 Census figures. Corpus Christi has not written those laws into its code. The only numbered UDC ordinances in the City Council records since 2024 are No. 033317 on plat applications and No. 033894 on trust funds. Planning staff briefed the Planning Commission on the 2025 laws on August 20, 2025. So each law applies from the statute itself:

• SB 15 limits lot rules on unplatted single-family tracts of 5 acres or more, away from airports and military bases. The UDC's smallest house lot is 4,500 square feet in RS-4.5; on a qualifying tract the statute allows 3,000.
• SB 840 requires multifamily housing in classifications that allow commercial uses. Corpus Christi already permits it in nine commercial districts, but not in CG-1 or BP.
• HB 24 set a 60 percent rule and a majority vote for protests by neighbors within 200 feet of a rezoning that adds homes. A protest by owners of 20 percent of the land being rezoned still needs a three-fourths vote. The UDC and the City's zoning page describe only the older 20 percent rule.

Where the UDC and a statute differ, the statute controls. The zoning districts page and the lot size page set out each difference.

How a Lot Reaches Two, Three or More Homes

Source: Corpus Christi UDC, Article 4, Section 5.3.2.A, Section 6.7 and Section 6.14.

Zoning Districts and the Use Tables

Table 4.1.1 lists 14 residential districts with their former names from the 1961 ordinance: FR, RE, RS-22, RS-15, RS-10, RS-6, RS-4.5, RS-TH, RS-TF, RM-1, RM-2, RM-3, RM-AT and R-MH, plus 16 nonresidential districts. In the use tables, "P" means permitted by right, "L" permitted with listed limits, "SUE" a special use exception from the Board of Adjustment, "SP" a special permit from the City Council, and an empty cell means not allowed.

The result for homes: the seven single-family districts allow one house per lot, plus an ADU; RS-TF adds two-family houses and townhouses; the four RM districts add apartments. A rezoning needs a Planning Commission hearing within 45 days of a complete application and a City Council decision, and costs $1,996.50 for under one acre in the FY 2026 schedule, plus a $250 notice surcharge. The zoning districts page has the full tables.

ADUs and Duplexes

Section 5.3.2.A allows one detached ADU per lot "in any residential zoning district," with a full kitchen allowed. The owner must live in the house or the ADU. The cap is the main house's floor area or, if smaller, 1,000 square feet in FR, RE and RS-22, 800 in RS-15 and RS-10, and 500 in RS-6 and RS-4.5 (800 on lots over 10,000 square feet). A legal garage built before 1980 can become an ADU of any size. Separate meters are prohibited.

A duplex, which the code calls a two-family house, is permitted in RS-TF and the RM districts. In RS-TF it needs a 6,000 square foot site, 3,000 per unit, 50 feet of width and 40 percent open space, and may be 45 feet tall. The ADUs and duplexes page covers the details, including two places where the ADU rules disagree with the general accessory building rule.

Townhouses, Apartments and Cottages

Three or more units in one structure on one lot is an "apartment" under Table 4.4.4, so a triplex or fourplex needs an RM or commercial district. RM-1 allows 22 units per acre, RM-2 30, RM-3 36 and RM-AT 60. Next to a house, Section 4.2.8 keeps a multifamily building back from the lot line by twice its height above the first 12 feet. Townhouses on their own lots need 1,600 to 2,600 square feet per unit. Cottage housing groups 5 to 12 cottages of 800 to 1,400 square feet around shared green space on half an acre or more. The three or more homes page covers each route.

Lots, Yards, Height and Parking

The smallest district lot for a house is 4,500 square feet and 45 feet wide in RS-4.5; RS-6 needs 6,000 and 50. An older lot of 2,000 square feet and 25 feet wide, held alone since January 10, 2006, can still hold one house (Section 9.5). Street yards are 25 feet in RS-22 to RS-6 and 20 in RS-4.5, side and rear yards 5 feet in RS-15 to RS-4.5, and houses may be 35 feet tall. Parking is 2 spaces per house or duplex unit, and 1.5 or 2 per apartment plus visitor spaces. The lot size page and the parking, setbacks and height page have the tables.

Flood, Coast and Navy Airfields

Chapter 14, Article V adopts the FEMA flood maps dated October 13, 2022 and puts the lowest floor of a new home one foot above base flood elevation. In V zones, homes stand on pilings and fill may not support them. Nueces County is a first tier coastal county under Insurance Code 2210.003, and the City's Informational Bulletin 021 says plans submitted from April 1, 2026 must meet the 2024 code wind speeds, 150 mph for houses. Beach and dune permits apply near the Gulf, and the Island Overlay sets design rules on Padre Island.

Around NAS Corpus Christi and two outlying fields, Section 6.5 sets clear zones and accident potential zones where homes are limited to detached houses in APZ-2. The flood, coast and military zones page covers each rule.

What the Numbers Show

Corpus Christi had 317,247 people on July 1, 2025, by the Census Bureau's Vintage 2025 estimate. The Census Bureau's 2025 permit file shows Corpus Christi reported 3 months of the year, so the Census filled in the other nine months.

Source: Census Bureau Building Permits Survey, South Region places, 2025 annual. The "reported" columns cover the 3 months Corpus Christi reported.

The Census counts a building by the number of homes it holds, so a fourplex is one building of three to four units. The file gives counts only, with no reasons behind them. Treat the estimate column as the Census Bureau's figure, since nine months of the year were filled in by the Census.

Plats, Permits and Fees

Dividing land into two or more parts needs a plat, and no building permit is issued until the plat is recorded (Section 3.8.1). The Planning Commission acts on a plat within 30 days of a complete application, matching Local Government Code 212.009. A minor plat, which combines existing lots into four or fewer without adding lots, is approved by staff for $911.74 under the FY 2026 schedule. A home pays a building permit of $0.461 per square foot and plan review of $0.146 per square foot.

New lots pay the City's water and wastewater trust fund fees: $266.47 for a single-family or duplex water lot and $575.39 for a wastewater lot in FY 2026, and a park fee of $462.50 per unit, adjusted each January since 2024. Ordinance No. 033894 of March 24, 2026 changed which fee applies to which property. The plats, permits and fees page has the full lists.

Where to Go Next

Related on VanPlex: the how Texas zoning works page, ADUs in Texas and the Texas multiplex guide overview.

Frequently Asked Questions

Official sources (checked October 2026)