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Council amends ADU rules, keeps small-lot exemption and moves land-use appeals off council
Summary
Mapleton amended its accessory dwelling unit (ADU) ordinance to comply with state law requiring quarter-acre allowance, removed an internal 40% size cap while keeping a Harvest Park small-lot exemption, and established an appeals hearing officer to handle administrative land-use appeals instead of the council.
The Mapleton City Council voted unanimously to amend city code for accessory dwelling units (ADUs) and to change the administrative land-use appeal process to comply with recent state law.
Planning staff explained the changes required by House Bill 477: the city must allow detached ADUs on lots of roughly a quarter acre (approximately 11,000 square feet). Staff recommended eliminating a local rule limiting ADU size to 40% of the main dwelling, leaving instead the existing size caps tied to lot size (1,000/1,200/1,400 square feet depending on lot dimensions) and standard accessory-building coverage limits.
Council members discussed neighborhood concerns. Staff and the city recorder noted that some small-lot subdivisions (notably Harvest Park) have CC&Rs and design constraints; the council voted to preserve the existing Harvest Park exemption given the subdivision’s narrow lots and streets. The council also approved retaining the ADU size limits by lot size while removing the 40% constraint.
On land-use appeals, state guidance limits council review of administrative decisions; staff recommended establishing an appeals hearing officer (typically a land-use attorney on contract) to hear administrative appeals rather than routing appeals to the city council. Council members discussed the alternative of a board of adjustments but noted difficulty maintaining trained members for an infrequent caseload. The council directed staff to prepare agreements with recommended hearing officers and approved the ordinance amendments.
Council members said the ADU changes aim to expand housing options while preserving neighborhood protections in particularly constrained subdivisions. Staff clarified that state law limits the city to requiring only one additional off-street parking space for an ADU and that HOAs cannot legally override the city's code requirement to allow ADUs in jurisdictions where state law mandates them.
