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Standards | Details |
|---|---|
Zones allowed | All zones used for single or multifamily housing: |
Lot Restrictions | None |
Minimum Lot Size | None |
Min/Max ADU Size | Min: 150 square feet Max detached (one bedroom or less): 850 square feet Max detached (two bedrooms or more): 1000 square feet Max attached: the greater of 50% of primary dwelling square footage or 850 square feet (one bedroom or less) / 1,000 square feet (two+ bedrooms) |
ADU Building Height | Attached: Same as primary dwelling |
Setbacks | Attached: California Gov. Code, § 65852.2, subd. (a)(1)(D)(vii): 4-feet side and rear |
Parking Requirements | No parking required but, if provided, can be tandem |
Owner Occupancy | Owner must live in the main dwelling or the ADU unless ADU was permitted between Jan 1 2020 and Jan 1, 2025 |
Sample fees from recent permits | ADU 1 (584 sf, attached): $6,736 |
Other requirements | Sprinklers for fire safety are required if the ADU results in a 50% increase in the original residence size or if a combination of increase in size and remodeling impacted 50% of the original square footage. All projects removing protected trees are subject to the Belmont Tree Ordinance. No short-term rentals allowed Only one ADU and one JADU per property is allowed in Single-Family Residential Districts. No more than two detached multi-family ADUs are allowed on sites with lawfully existing multifamily dwellings. Sewer must connect to the lateral for the main dwelling. |
Process | Making an appointment to meet with a planner in the initial stages of the project can help avoid challenges and is highly recommended. Building permit and design review are required. |
Exceptions | ADUs must comply with Residential Design Criteria if the new construction includes 1) ground floor plate height exceeding 12-feet or roof height exceeding 18 (measured from finished grade) or 2) creates or expands an upper floor. |
Created by Community Planning Collaborative
