San Mateo County
Colma ADU rules
Colma has an official local rule record in this scrape. Provider research is grouped at the San Mateo County level.
Local rule facts
Min/max ADU size
One bedroom or less: 850 square feet Two bedrooms: 1000 square feet *50% of main home floor area, unless under 800 square feet (state law allows an ADU up to 800 square feet on every property) JADUs: 500 square feet
Height
Attached: 25 feet Detached: 16 feet if not within ½ mile of transit, 18 feet if within ½ mile of transit
Setbacks
Conversion of existing area of residence to JADU: No setback requirements ADU of 800 Square Feet or less: Side setback: 4 feet minimum. Rear setback: 4 feet minimum. Front setback: 19 feet minimum. Street-facing property line setback: 15 feet minimum ADU of 800 Square...
Parking
JADUs: No parking required ADUs: One spot may be required (tandem allowed) No parking required if: ½ mile walking distance from public transit, in a historic district, or one block from a car-share vehicle on-street parking permits are required but not offered to ADU...
Owner occupancy
JADUs: Required. ADUs: Not required if built recently (2020-2025)
Process
-at-a-Glance FAQs Floorplans Inspiration Glossary Guidebook + Exercises Pre-Designed Plans Process-at-a-Glance See the resources page Events About Contact Getting Started Learning the Rules Budgeting Design Permitting Construction Renting Getting Started Learning the...