News Flash

Planning & Development Services

Posted on: June 28, 2018

New Accessory Dwelling Unit Guide Posted Online

Waterfall flowing over rocks

The City’s Planning and Development Services Department has developed a comprehensive guide on Accessory Dwelling Units (ADUs), or secondary living spaces constructed on single family lots, that is available online at

“We’ve received a lot of inquiries from residents interested in constructing an Accessory Dwelling Unit since adoption of Code SMTX in April,” said Planning Manager Abby Gillfillan. “This informative and easy-to-read document will be a valuable resource to property owners, residents, and the development community.”

The online ADU guide answers common questions surrounding the construction of an accessory dwelling, including:

  • Ownership and location requirements
  • Site requirements
  • Building standards
  • Permit process

Accessory dwelling units may be part of the primary living space (such as a converted garage) or a separate structure on an owner occupied, single-family property. The structure may be rented to provide additional income to the homeowner. ADUs can benefit the community by contributing to the supply of affordable and diverse housing types to meet the varying needs of San Marcos residents.

ADUs may also provide housing for extended family, or may be rented short-term when registered and compliant with the City’s Short Term Rental Ordinance (posted online at

For more information, contact Planning & Development Services at 512.393.8230 or


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