Can I Build Garage Conversion in Santa Monica, CA? (2026)
Find out if you can build a garage conversion in Santa Monica, CA. Rules, permit requirements, costs, and next steps.
Yes, garage conversions to living space are permitted in Santa Monica, CA. Replacement parking is not required.
Converting an attached or detached garage into living space in Santa Monica, CA is a popular way to add an ADU or additional living area without new construction. Garage conversions are permitted in Santa Monica, but must comply with habitable space building codes: insulation, ventilation, electrical, egress windows, and minimum ceiling height. A key consideration: California law eliminates replacement parking requirements for garage-to-ADU conversions, making garage conversions particularly attractive.
Garage Conversion Rules in Santa Monica
Garage Conversion Rules in Santa Monica: Allowed: Yes. Replacement parking required: No. Garage conversions to ADU do not require replacement parking per California Gov Code §66314(d)(11) (Stats. 2024 Ch. 7 §20). In Santa Monica's dense environment, many homeowners trade garage space for ADU rental income — a JADU or ADU from a converted garage can rent for $2,500–$4,000+/month. Building permit required. Habitable space upgrades critical: Santa Monica's marine climate requires moisture-resistant construction, adequate ventilation, and proper insulation. Rent control implications must be considered if the converted garage was previously a rentable structure. All garage conversions to habitable space require a building permit. The converted space must meet minimum habitable room standards (typically 7 ft ceiling height, egress window, insulation, and ventilation).
Costs & Fees
Garage conversion permit fees in Santa Monica are typically based on project valuation. Contact the Santa Monica Community Development Department — Building and Safety Division at (310) 458-8355 for current fees. Conversion costs typically range $20,000–$80,000 depending on scope (permits, labor, materials, utility connections).
Timeline
Permit timeline: typically 2-6 weeks for plan check. Construction: 2-4 months for a typical garage conversion.
Next Steps
Next steps for converting your garage in Santa Monica: 1. Determine if the conversion will be an ADU (separate unit with kitchen/bath) or additional living space. 2. Check replacement parking requirements for your zone. 3. Have a contractor assess structural requirements (ceiling height, foundation, utilities). 4. Submit plans and permit application to the Santa Monica Community Development Department — Building and Safety Division. 5. See the full ADU rules page for size limits and requirements if creating an ADU unit.
Santa Monica Community Development Department — Building and Safety Division
Phone: (310) 458-8355
Website: https://www.santamonica.gov/departments/community-development/building-and-safety
Online Permits: https://eservices.smgov.net/
Frequently Asked Questions
Can I do Airbnb in Santa Monica?
Santa Monica has some of California's strictest short-term rental restrictions. Whole-home rentals where you (the host) are not physically present are effectively banned — only 'home-sharing' where you remain on the premises is permitted. You must register ($200/year) and be a permanent resident of the property. Renting your entire home while you travel is prohibited. Airbnb actively enforces Santa Monica's ordinance and removes unregistered listings. Violations carry fines up to $1,500 per day for unhosted rentals.
Does Santa Monica rent control apply to an ADU I build?
Generally, new ADUs built in a standalone new structure or converted garage after 1995 are exempt from Santa Monica Rent Control under Costa-Hawkins Rental Housing Act. However, ADUs created within existing multifamily buildings built before 1979 may be subject to the Santa Monica Rent Control Charter Amendment. This is complex — consult the Santa Monica Rent Control Board (310-458-8751) or a local attorney before creating an ADU in or adjacent to a rent-controlled building.
Does my Santa Monica property need a Coastal Development Permit for an ADU?
Properties in Santa Monica's Coastal Zone (generally west of Lincoln Blvd, plus Palisades Park and some beachfront properties) require a Coastal Development Permit (CDP) from the City of Santa Monica's Coastal Manager in addition to a standard building permit. The CDP review for ADUs that comply with the Local Coastal Program is typically ministerial (2-4 weeks). Contact Santa Monica Planning at (310) 458-8341 to determine if your property is in the Coastal Zone before submitting your ADU application.
What are the height limits for homes in Santa Monica?
R1 single-family zones (North of Montana, Sunset Park, North Santa Monica) limit buildings to 28 feet and 2 stories. Neighbors in R1 neighborhoods closely monitor height and setback compliance. Multifamily zones (R2, R3, R4) allow 30-50 feet. The Mixed Use (MU) zone along the Metro E Line corridor allows up to 65 feet for mixed-use buildings. All structures must comply with California Fire Code ladder access requirements above 50 feet.
How do I sell cottage food products in Santa Monica?
Santa Monica's famous farmers markets (Wednesday and Saturday on Arizona Avenue) are prime venues for cottage food sellers. Register your home kitchen as a Class A Cottage Food Operation with LA County Environmental Health (no revenue cap for direct sales). No city permit beyond the standard Business License is required. The Santa Monica farmers markets are among California's highest-volume direct-to-consumer food markets — cottage food vendors often do $1,000-2,000 per market day at peak season.
What is the difference between Santa Monica's R1, R2, and R3 zones?
R1 (Single-Family) is found primarily in North of Montana (north of Montana Ave) and Sunset Park (south of Olympic Blvd). It allows only one primary dwelling per lot plus an ADU and JADU per state law. R2 (Two-Family) allows duplexes and small apartment buildings — common in Ocean Park and Mid-City. R3 (Medium Multifamily) and R4 (High Multifamily) are concentrated near downtown, Wilshire Blvd, and the Metro E Line corridor, allowing 3-4+ story apartment buildings. Use Santa Monica's zoning map at smgov.net to find your parcel's zone.
Can I have both an ADU and a JADU on my Santa Monica R1 lot?
Yes. California state law (Gov Code §§66314–66333 (Stats. 2024 Ch. 7 §20) and §66333 (Stats. 2024 Ch. 7 §20)) allows one standard ADU (up to 1,200 sqft detached or attached) AND one Junior ADU (up to 500 sqft within the existing structure) simultaneously on a single-family R1 lot. In Santa Monica's market, both can command premium rents — a 1,200 sqft detached ADU can rent for $4,000-6,000/month, while a 500 sqft JADU within the main house can rent for $2,500-3,500/month. Note rent control and Coastal Development Permit implications before proceeding.
Source: Santa Monica Community Development Department — Building and Safety Division — Building Regulations. Last verified April 6, 2026. View source