A Guide to Accessory Dwelling Units

BUILDING STANDARDS

SIZE RESTRICTIONS The maximum square footage of the habitable area of an ADU is limited to either one half (1/2) the habitable area of the primary building, or one thousand (1,000) square feet, whichever is smaller. HEIGHT RESTRICTIONS The maximum height of a detached ADU is determined by the zoning district. An ADU located on a single-family zoned property must not exceed a height of twenty four (24’) feet. M easuring height Building height is measured from the average grade to the mean height level between the eaves and ridge of a gable, hip, mansard, or gambrel roof, or to the highest point of the surface of a flat roof. A verage G rade Average grade is determined by calculating the average of the highest and lowest elevation along the front of the building, parallel to the primary street setback.

Average Grade Maximum 24’ Maximum size of half the main house or 1,000 sq. ft. whichever is smaller

Pg. 6

City of San Marcos Planning and Development Services Departmen t

Made with FlippingBook flipbook maker