H.B. No. 3919 introduces new regulations regarding size and density requirements for residential lots in certain municipalities in Texas. The bill adds a new Subchapter D to Chapter 211 of the Local Government Code, which defines terms such as "housing organization" and "small lot," and specifies that the new regulations apply only to municipalities with populations over 90,000 that are located in counties with populations exceeding 300,000. The bill prohibits municipalities from enforcing ordinances that require residential lots to exceed specific 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 that municipalities cannot impose excessive setback requirements or other restrictions on small lots, while still allowing for some regulations such as shared driveways. It also clarifies that the new subchapter does not affect existing zoning authority or homeowners' associations. Individuals adversely affected by violations of this subchapter can bring legal action against municipalities, with provisions for damages and attorney's fees. The bill is set to take effect on September 1, 2025.

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