24 CFR § 3285.903
[Amendment] Permits, alterations, and on-site structures
February 22, 2021
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(c) Installation of an add-on or attached accessory building or structure. Each attached accessory building or structure or add-on is designed to support all of its own live and dead loads, unless the attached accessory building or structure is otherwise included in the installation instructions or designed by a registered professional engineer or registered architect in accordance with this part.
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