ADU rules in Draper

D-ADUs are a permitted use in all primary residential zoning districts, master planned community (MPC) zones, and residential special districts (RSD), but only on lots or parcels 12,000 sq ft or greater that contain no more than one single-family dwelling; must be located in the rear yard, meet main-building setbacks and height limits, and match the primary dwelling's architecture. One D-ADU per lot.

Internal ADUs (I-ADUs) are a permitted use in all primary residential zoning districts except in map-designated areas (Exhibit A, section 9-31-090), where a deviation approved by the planning commission is required. Not permitted on lots of 6,000 sq ft or less, in mobile homes, or where the primary dwelling has a failing septic system. Must be contained within the existing footprint of the primary dwelling with no exterior changes altering its single-family appearance. One I-ADU per lot; not allowed inside a D-ADU or other detached structure.

Code text: 'The total square footage of a D-ADU shall not exceed fifty percent (50%) of the single-family dwelling's total square footage not including the garage.' No explicit square-footage cap found for I-ADUs; they are limited to the existing footprint of the primary dwelling.

No ADU may be separately rented, leased, hired or loaned unless the owner of record occupies either the primary dwelling or the ADU as their primary residence. Annual permit renewal requires a notarized affidavit attesting to continued owner occupancy.

At least one additional parking stall above the minimum required for the primary dwelling, reserved for exclusive ADU use; may not be tandem with the primary dwelling's stalls, must be accessible from the street by a driveway, and must be constructed of concrete or asphalt. Applies to both D-ADUs and I-ADUs; garage or carport spaces displaced by an I-ADU conversion must be replaced.

ADUs are a permitted use in eligible zones, approved administratively: the zoning administrator reviews and approves ADU permit applications against fixed standards. However, the ADU permit must be renewed annually (notarized owner affidavit), and I-ADUs in Exhibit A prohibited areas require a planning commission deviation. A building permit is separately required for construction.

Code: an I-ADU shall not be rented or leased for less than 30 consecutive days, and only one rental agreement or lease may be in effect at a time (9-31-030(H)); no ADU may be rented without a valid ADU permit (9-31-030(A)). The city's ADU page states the same 30-day minimum for D-ADUs: 'The D-ADU shall be rented or leased for a time period of at least 30 consecutive days or more' and 'ADUs must be rented for terms of 30 days or longer.'