The Single Resource for County Permits and Applications. Navigate San Bernardino ADU regulations with ease.For in-person applications, two (2) paper copies of the plans, a completed eligibility checklist, and a completed building permit application are required. What bedroom size unit do I qualify for? Plan Two comes in a Modern Spanish style that's designed to entice, inside and out. These plans may be used as a dwelling unit in the unincorporated areas of the County of San Diego.