H.B. No. 3919 introduces new regulations regarding size and density requirements for residential lots in certain municipalities in Texas. The bill establishes a new Subchapter D in Chapter 211 of the Local Government Code, which applies specifically to municipalities with populations over 90,000 that are located in counties with populations exceeding 300,000. It prohibits these municipalities from enforcing ordinances that require residential lots to exceed specified dimensions (larger than 1,400 square feet, wider than 20 feet, or deeper than 60 feet) or impose density restrictions resulting in fewer than 31.1 dwelling units per acre. Additionally, the bill outlines definitions for terms such as "housing organization" and "small lot," and specifies that certain zoning restrictions cannot be applied to small lots.

The bill also clarifies that it does not affect existing zoning authority or homeowners' associations' rules. It allows for legal action against municipalities that violate these provisions, enabling affected individuals or housing organizations to seek relief through the courts, including declaratory judgments, injunctions, and damages. The bill emphasizes that governmental immunity is waived in cases of liability created by these new regulations. The provisions of this act are set to take effect on September 1, 2025.

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