Shed Permit Requirements in California

California Sets a Uniform 120-Square-Foot Threshold

Unlike states that leave building code decisions entirely to local governments, California enforces a statewide building code that sets a consistent baseline for shed permits. The California Building Code (CBC), Title 24, Part 2, Section 105.2, exempts one-story detached accessory structures used as tool and storage sheds, playhouses, and similar uses from a building permit — provided the floor area does not exceed 120 square feet.

This 120-square-foot threshold applies across all 58 counties and hundreds of cities in the state. A 10x12 shed is the largest standard size that fits within the exemption. The statewide rule creates a level of consistency that homeowners in states like Texas don't get, where the exempt size can range from 120 to 300 square feet depending on which city you're in.

But the CBC sets a floor, not a ceiling. Individual cities and counties can and do add their own restrictions on top of the state standard. San Francisco, for example, lowers the height limit for exempt sheds to 10 feet and limits garden structures to 100 square feet under its planning code. Sacramento County requires sheds between 9 and 12 feet tall to maintain a 5-foot setback from property lines even if they're under 120 square feet. The state code gives you the permit exemption, but your local zoning code determines where the shed can go and what it can look like.

For a broader look at how shed permit rules work across the country, see our national guide to shed permits.

What the Exemption Requires

The 120-square-foot exemption is not a blank check. To qualify, a shed must meet all of the following conditions under CBC Section 105.2:

• One story only — no lofts with finished floor space above the main level
• Floor area does not exceed 120 square feet — measured by gross floor area
• Height does not exceed 12 feet — from grade to the highest point of the roof (some cities set a lower limit)
• Maximum roof projection does not exceed 24 inches — eaves can't extend more than 2 feet beyond the walls
• Used for storage, tools, or similar non-habitable purposes — not as a home office, workshop with HVAC, guest room, or living space
• No electrical, plumbing, or mechanical systems — any utility connections require separate trade permits regardless of shed size

If your shed fails any of these conditions, you need a building permit. A 10x12 shed with a single electrical outlet? Permit required for the electrical work. A 10x10 shed used as a home office with insulation and a mini-split? That's habitable space and requires full permitting as a habitable structure — potentially even ADU regulations depending on the jurisdiction.

How California's Largest Cities Handle Shed Permits

The statewide 120-square-foot exemption provides the baseline, but each city adds its own zoning layer. Here's how five of California's largest cities apply the rules.

Los Angeles: 120 Square Feet, 12 Feet Tall

Los Angeles follows the state standard closely. The city's building code exempts one-story detached accessory structures under 120 square feet with a maximum height of 12 feet and a maximum roof projection of 24 inches. No electrical, plumbing, or mechanical equipment can be installed without separate permits.

LA's zoning code adds placement restrictions. Accessory structures must maintain a 5-foot setback from side property lines and a 15-foot setback from the rear property line in most residential zones. Sheds are generally restricted to the rear yard. The city does not have traditional lot coverage caps for small sheds, but larger accessory structures count toward the total floor area ratio (FAR) allowed on the lot.

Permit fees in Los Angeles are calculated based on the project's construction valuation. For an accessory structure that requires a permit — meaning anything over 120 square feet — the typical process involves a counter plan check at the Department of Building and Safety, which takes 45 to 60 minutes for review and approval.

San Francisco: Stricter Than the State Standard

San Francisco is the notable outlier. While the San Francisco Building Code (SFBC 106A.2.1) exempts storage sheds under 120 square feet from a building permit, the city's planning code applies a tighter standard for garden structures: 100 square feet and 8 feet in height. If your shed exceeds either the 120-square-foot building code limit or the planning thresholds, you need both building and planning approvals.

The city also caps the height of permit-exempt sheds at 10 feet, lower than the state's 12-foot standard. A shed exceeding 120 square feet or 10 feet in height requires a building permit with plans and Planning Department approval regarding setbacks and location.

San Francisco's small lot sizes make placement a challenge. Many residential lots in the city are only 25 feet wide, and maintaining setbacks from all property lines can leave very little room for a shed. The Department of Building Inspection provides a detailed FAQ on storage shed requirements that is worth reviewing before you build.

San Diego: 120 Square Feet with 6-Foot Building Clearance

San Diego County's code adds a spacing requirement not found in the state baseline: exempt sheds must maintain a minimum 6-foot clearance from other buildings on the lot. This is a fire separation measure, and it applies to all one-story detached accessory buildings under 120 square feet, including those used as tool sheds, playhouses, and storage.

The county code also explicitly includes sea cargo containers in the shed category — a recognition of Southern California's growing trend of repurposing shipping containers for backyard storage. A shipping container used as a non-habitable shed under 120 square feet is exempt from a building permit, but it must meet the same clearance and zoning requirements as any other shed.

For sheds that do require a permit, applications go through the city's Development Services Department or the county's Planning & Development Services, depending on whether the property is in an incorporated city or unincorporated county area.

Sacramento County: Height Tiers for Setbacks

Sacramento County follows the 120-square-foot exemption but adds a tiered setback rule based on height. Sheds under 120 square feet and under 9 feet tall can be placed on the property line (zero setback). Sheds between 9 and 12 feet tall must be at least 5 feet from the property line and must maintain all required zoning setbacks.

This tiered approach is practical: a low-profile shed that doesn't cast shade or block views gets more placement flexibility, while a taller shed with a steeper roof pitch needs more buffer space. Sacramento County also prohibits all accessory structures — regardless of size — from being placed in maintenance easements or public utility easements.

Fresno: Standard CBC Rules Apply

Fresno follows the CBC standard without significant local amendments for small sheds. One-story detached accessory structures under 120 square feet, with no utilities and used for storage, are exempt from a building permit. Sheds over 120 square feet require a permit through the Fresno County Department of Public Works and Planning, Building Division.

Wildfire Zones Add a Layer of Complexity

California's wildfire risk creates a unique permitting consideration that doesn't exist in most other states. If your property falls within a designated Fire Hazard Severity Zone — and millions of California homes do — your shed may need to comply with CBC Chapter 7A, which sets minimum standards for fire-resistant materials and construction methods.

Chapter 7A applies to new buildings in any Fire Hazard Severity Zone within State Responsibility Areas, any Local Agency Very-High Fire Hazard Severity Zone, and any Wildland-Urban Interface Fire Area designated by the local enforcing agency. The key question for shed builders is proximity: detached accessory buildings like sheds are generally not subject to Chapter 7A requirements if they are located at least 50 feet from a building covered by the code.

If your shed is within 50 feet of your house in a WUI zone, the following may apply:

• Exterior wall coverings must be ignition-resistant or noncombustible
• Roof coverings must be Class A fire-rated
• Ventilation openings must be covered with ember-resistant vents approved by the State Fire Marshal
• Combustible materials must be kept away from the structure per defensible space rules

The practical impact: a homeowner in the Oakland hills, San Diego backcountry, or San Bernardino foothills building a small garden shed close to the house may need to use fire-resistant materials even if the shed is under 120 square feet and otherwise exempt from a building permit. Check with your local fire department and the CAL FIRE Office of the State Fire Marshal to find out if your property is in a WUI zone.

Seismic Considerations

California is seismically active, and while the state building code includes extensive seismic provisions, small storage sheds are generally not subject to structural seismic design requirements. The seismic provisions in the CBC apply to buildings that are designed for human occupancy or that house critical equipment. A simple storage shed under 120 square feet sitting on concrete blocks or a gravel pad is not required to be engineered for seismic loads.

However, if your shed is larger and requires a permit, the plans may need to address seismic bracing, foundation anchoring, and connection details — particularly if the shed has a concrete slab foundation or is built on a hillside lot where soil stability is a concern. This is more relevant for workshop-size structures (200+ square feet) than for basic garden sheds.

Foundation Type and the Permit Question

The CBC's permit exemption for sheds under 120 square feet does not specify a foundation type. You can place an exempt shed on a gravel pad, concrete blocks, timber skids, or even a concrete slab without triggering a building permit — as long as the shed meets all other exemption criteria.

That said, there are practical reasons to avoid a permanent concrete slab for a small shed. A concrete slab counts as impervious surface under most city stormwater ordinances, which matters if your lot is near its impervious cover limit. Cities like Los Angeles and San Francisco have stormwater management rules that count any paved or built surface toward the total lot coverage. A gravel pad or pier blocks let rainwater absorb into the ground and keep your impervious coverage lower.

For sheds over 120 square feet that require a permit, the foundation design becomes part of the plan review. The building department will want to see that the foundation is adequate for the structure and the site conditions — particularly on sloped lots, expansive soils, or in flood-prone areas.

Utilities Always Trigger a Separate Permit

This rule is absolute in California: any electrical, plumbing, or mechanical work requires a permit, even if the shed itself is exempt from a building permit. The CBC is explicit on this point — Section 105.2 states that separate trade permits are required for the above-exempted items.

Running a single circuit to power a light and a couple of outlets in a 10x10 shed requires an electrical permit. The work must be performed by a licensed electrician (in most jurisdictions), the electrician pulls the permit, and the city inspects the wiring before it can be connected to the main panel.

The same applies to plumbing (running a water line, adding a utility sink) and mechanical work (installing a mini-split for heating and cooling). Each trade has its own permit and inspection requirements.

This catches homeowners who build a small shed without a permit — correctly — and then run an extension cord underground or wire an outlet without one. The shed was legal; the electrical work is not. If a code enforcement officer or inspector identifies unpermitted electrical work, the homeowner faces fines and may need to open walls for inspection.

HOA Restrictions in California

California has a significant number of properties governed by Homeowners Associations (HOAs), particularly in the suburban communities of Southern California, the Inland Empire, and the Bay Area suburbs. HOA rules about sheds are often stricter than city building codes.

Common HOA restrictions include limits on shed size, materials, colors, roof style (requiring the shed to match the house), and placement. Some HOAs prohibit sheds entirely or limit them to specific types — allowing only manufacturer-built sheds but not site-built ones, or requiring that sheds be screened from the street by landscaping or fencing.

California's Davis-Stirling Common Interest Development Act governs HOAs in the state, but it does not include a provision protecting a homeowner's right to build a shed. Unlike solar panels, where state law limits HOA authority to restrict installation, HOAs have broad discretion to regulate or prohibit accessory structures like sheds within their communities.

Always check with your HOA's architectural review committee before building or purchasing a shed. Get approval in writing before you start.

Consequences of Skipping the Permit

If your city requires a permit for your shed and you build without one, the consequences in California can be significant:

• Stop-work orders during construction
• Fines that vary by city — some cities charge double the standard permit fee for retroactive permits
• Removal orders if the shed violates zoning setbacks or lot coverage limits
• Sale complications — unpermitted structures can delay or derail real estate transactions when buyers, appraisers, or title companies flag the violation
• Insurance issues — damage to or caused by an unpermitted structure may not be covered by your homeowner's policy

Shed permits in California typically cost between $50 and $200 for a standard residential storage shed, depending on the city's fee schedule and the project's valuation. That's a small cost compared to the potential consequences of building without one.

If you're also planning a garage or carport alongside your shed, note that California has separate permit requirements for each structure. Zoning rules often limit the total lot coverage of all accessory structures combined, so plan your projects together to avoid exceeding the allowance.

For an overview of all building permit requirements in California — including decks, fences, pools, and more — see our complete California building permit guide.