How Rockwall County reviews development before new growth begins

Rockwall County grew from 107,819 people in the 2020 Census to 140,738 on July 1, 2025, across 127.2 square miles of land. Long before a backhoe arrives, the county's development rules decide whether a project belongs to a city, the county, or both. That answer affects the plat, the permit trail, the roads and drainage tied to the site, and how quickly a builder can break ground.

The county had 47,926 housing units in its 2024 profile, 2,986 employer establishments in 2023, and a median household income of $115,884.

Where the county's authority begins

Texas law uses extraterritorial jurisdiction, or ETJ, to regulate land just outside city limits. Chapter 42 states that the purpose is to promote and protect the general health, safety, and welfare of people living in and adjacent to municipalities, and Chapter 242 requires the county and municipality to sign a written agreement identifying who regulates subdivision plats and related permits in that ETJ. Rockwall County has such an interlocal agreement with Fate, Heath, McLendon-Chisholm, Rockwall, Rowlett, and Royse City, so a parcel at the edge of town can fall under city rules, county rules, or a negotiated mix of both.

The county's maps page offers a map book, city-limits-and-ETJ layers, a 2018 thoroughfare plan, and a monument network, while warning that the maps are only illustrative and should not be used to settle boundary disputes. For homeowners, HOA boards, and landowners, the controlling document is the recorded jurisdiction that determines the next step.

What Development Services checks before construction

Rockwall County Development Services helps local government plan and manage growth so the county grows in a safe and organized way. Its duties include reviewing building plans, issuing permits, checking that new projects follow safety rules, helping with infrastructure such as roads, and assigning addresses in rural, unincorporated parts of the county.

The county's Development Application Handbook, revised November 26, 2024, shows how many pieces can be on the table before construction starts: subdivision applications, construction plan applications, site development permits, 911 addressing checklists, screening of certain nonresidential uses, regulated land-use permits, manufactured-home-park permits, septic permits, culvert and driveway permits, floodplain development permits, and commercial or multifamily building permits. The handbook also recommends a pre-application meeting with the Development Coordinator to decide whether a site development permit is required and which review path applies.

A subdivision application does not count as approval when it is filed, the Development Coordinator runs a completeness check, and once an application is complete the county will review and act on it within 30 days. Roads, on-site septic systems, and other site improvements required with a subdivision must be constructed and inspected by the county before a final plat is recorded.

Who pays for roads, culverts, and drainage

Subdivision application fees are meant to defray the costs of reviewing, inspecting, and maintaining plats and related documents. On the ground, a county-maintained road must be outside a city boundary, not privately maintained, and within a subdivision where the developer has met county road standards and the agreed time frame in the final platting.

Before a building permit is issued, the county requires approved OSSF system plans and approved driveway or culvert permits. The site design has to solve how water and access will work before the structure goes up. The county also issues culvert permits through Road and Bridge.

Rockwall County's current thoroughfare plan update began in January 2026 and is expected to finish in spring 2027. The plan does not fund or schedule construction. Instead, it identifies future roadway corridors so the county can preserve right-of-way, and a typical roadway can take around 10 years or more from initial planning to opening.

A workshop notice in the county record states that city agreements can require developers to dedicate public right-of-way according to the Rockwall County Thoroughfare Plan and the subdivision rules attached to the ETJ agreement. In practice, that means the next subdivision can be asked to make room for the road network before the road network exists.

What the rules look like on the ground

River Rock Trails in southern Rockwall County shows the stakes in one place. DMDS Land Company owned about 1,867 acres in an unincorporated area near McLendon-Chisholm, and D.R. Horton had a contract for a residential development called River Rock Trails with preliminary plats for 418 homes on about 85 acres in two phases. The county had tried to require the developer to pay a share of county infrastructure improvements needed for the project, including roads and law enforcement, and the Commissioners Court later accepted the developer's proposed payments for roads and sheriff's services while dropping previously required amounts tied to other county infrastructure, such as schools, for the platted portions.

The Texas Department of Licensing and Regulation lists a Chick-fil-A at 380 W. Interstate 30 as a privately funded, 5,090-square-foot project with an estimated cost of $4.5 million, a start date of October 6, 2025, and a completion date of April 9, 2026. It also lists a Pizza Ranch at 626 W. I-30 with an estimated cost of $2.6 million, a start date of February 1, 2026, and a completion date of October 1, 2026. Royse City's Planning and Zoning Commission also took up overlay compliance and development plat questions tied to those sites.

Royse City's Community Development Corporation says the Chick-fil-A should spare some residents a drive to Rockwall or Greenville and expects 80 to 120 jobs.

How to track a project before it starts

If land sits near a city edge, check the county maps for the ETJ line, ask whether the city or county controls subdivision review, schedule a pre-application meeting with Development Services, and confirm whether the site needs subdivision, site development, floodplain, septic, driveway, or culvert approvals before the county will sign off on a final plat or building permit. Rockwall County's permit pages and public meeting records show when open land becomes a recorded subdivision, a commercial pad, or a finished street.