Shed Permit Requirements in Marin County, CA
Marin County Community Development Agency - Building & Safety Division at 3501 Civic Center Drive Suite 308, San Rafael CA 94903 (415-473-6550) issues building permits for unincorporated Marin County, including Greenbrae, Kentfield, and surrounding unincorporated areas of ZIP 94904. ZIP 94904 also has a partial overlap with the incorporated City of Larkspur (Larkspur Building Division at 400 Magnolia Ave Floor 2, Larkspur CA 94939, 415-927-5038, building@cityoflarkspur.org); parcels inside Larkspur city limits use the city building department. California Building Standards Code (Title 24): the 2025 CBC/CRC/CMC/CPC/CEC and Title 24 Part 6 (Energy Code) and Part 11 (CALGreen) took effect January 1, 2026 (replacing 2022 cycle). Marin County adopts Title 24 with local amendments under County Code Title 19, including CALGreen Tier 1 green building measures and provisions for tiny homes, strawbale, cob, light straw-clay, and 3D-printed structures. Distinctive requirements: (1) ALL new 1- and 2-family dwellings must have automatic fire sprinklers per CRC R313 (NFPA 13D); (2) Most of unincorporated Marin including Greenbrae/Kentfield is in Very High Fire Hazard Severity Zone (VHFHSZ) / WUI — Chapter 7A ignition-resistant construction applies, plus PRC § 4291 defensible space (30-150 ft cleared zone, annual Central Marin Fire inspections); (3) State-mandated solar PV on new construction per Title 24 Part 6 § 150.1(c); (4) ADU state preemption (AB 68, AB 881, SB 13, AB 671) — Marin must approve ADUs by-right within 60 days, no minimum lot size, 4-ft setbacks, fee waivers under 750 sq ft; Marin County offers ADU permit fee discounts through 2026; (5) Greenbrae has FEMA flood zones (AE/VE) along Corte Madera Creek — flood insurance and elevation requirements apply; (6) Septic systems regulated by Marin County Environmental Health Services (415-473-6907); (7) Mello-Roos CFD assessments may apply on some parcels. CA Contractors State License Board (CSLB) requires state license for ALL contractors over $500 (B General Building, C-10 Electrical, C-36 Plumbing, C-20 HVAC, etc.). Owner-builder exemption per CSLB requires 1-year prior residence, sale prohibition, max 2 structures in 3 years. CA Climate Zone 3 (coastal temperate); Bay Area is high seismic (SDC D2). Pre-1978 homes: California lead-safe practices required; pre-1980 may have asbestos requiring NESHAP-compliant abatement. BayREN heat pump water heater rebates available.
By Joey, Founder · Last verified April 25, 2026 · How we research →
When you don’t need a Shed permit in Marin County
A detached accessory shed of 200 square feet or less without electrical or plumbing is exempt from a building permit under 2025 CRC R105.2. County zoning setbacks apply. WUI/VHFHSZ parcels: shed must use Chapter 7A ignition-resistant materials if within 30 ft of dwelling. Adding electrical later requires a CSLB C-10 contractor and electrical permit.
When you need a Shed permit in Marin County
A shed larger than 200 square feet requires a building permit. CSLB-licensed contractor required if cost over $500. Submit application via the online portal. WUI/VHFHSZ parcels: Chapter 7A ignition-resistant materials required.
Shed Permit Costs: Marin County vs. Nearby
| City | Estimated Fee |
|---|---|
| Marin County | N/A |
| Los Angeles | $200 – $1,200 |
| Sacramento County | $50 – $250 |
| San Diego | $170 – $1,020 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Marin County permit costs →
Real Shed Permit Data for Marin County
From our own dataset of permits filed in Marin County over the last 3 years.
Most-active contractor: Owner/builder with 17 permits filed.
These figures reflect actual permits issued in Marin County, not state averages or estimates. Your project may differ based on scope, valuation, and the specific work proposed.
Zoning & HOA Considerations
Sheds may be subject to zoning setback requirements and lot coverage limits. Placement near property lines or in front yards may require zoning approval.
If you live in an HOA community: many HOAs restrict or prohibit outbuildings. Check your CC&Rs for rules on shed size, placement, materials, and appearance before purchasing or building.
Estimated Project Timeline in Marin County
Here's a typical timeline for a shed project in Marin County, CA:
Timeline is based on Marin County's typical about 2 weeks permit processing time. Actual timelines vary by project complexity, completeness of application, and current department workload.
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Frequently Asked Questions
Contact Marin County's building department for current Shed permit fee information. Fees typically vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Shed projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in Marin County can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for Shed permits in Marin County is about 2 weeks. More complex projects may take longer if plan review is required.
If you live in an HOA community, you may need architectural review approval in addition to a building permit. HOA rules and city building codes are separate, you may need to satisfy both. Review your CC&Rs and submit to your HOA's architectural review committee before starting work.
Learn More About Shed Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Shed Guide →