Colma ADU size limits
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
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.
Direct answer
Can I build an ADU in Colma?
Colmahas an official local ADU rule record in this directory. Start with the city's size, height, setback, parking, and owner occupancy standards below, then confirm lot-specific limits with the official source before hiring design or construction help.
Colma ADU rule guide
Colma height and setbacks
Attached: 25 feet Detached: 16 feet if not within ½ mile of transit, 18 feet if within ½ mile of transit 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 Feet or more:...
Colma parking and owner occupancy
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 occupant JADUs: Required. ADUs: Not required if built recently (2020-2025)
How Colma ADU permitting works
-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 Rules Budgeting Design Permitting Construction Renting Home » Local Rules » Colma Local ADU Rules Colma Last Updated...
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...