Do You Need a Permit for a Shipping Container?
Who decides
Container rules are local. Your county or city sets them through two offices that answer different questions: planning or zoning decides whether a container may sit on your lot, where, for how long and how it must look; the building department decides whether it needs a permit under the building code the jurisdiction has adopted. If you live under a homeowners association, its covenants are a third layer, approved separately.
What usually triggers a permit
- Size. Many places exempt small accessory structures, often up to 200 sq ft, sometimes only 120. A 20ft container covers about 160 sq ft and a 40ft 320 sq ft.
- Use. Once a container is used as a building, such as an office, a workshop, a studio or a home, it falls under the building code like any structure. The permit comes after the plan; for what the containers themselves cost, see shipping container home cost.
- Power, water and sewer. Connecting utilities usually brings electrical, mechanical or plumbing permits of its own, in some cities even for a temporary container.
- Cuts, stacking and joining. Openings cut into the steel, containers stacked or joined together call for structural calculations.
- Permanence. A permanent foundation, or a stay longer than the time a city allows for temporary use, which some set at 30, 60 or 90 days, moves a container from “parked” to “built.”
Two real examples
The same container can get opposite answers. In King County, Washington, a container used as a building needs a permit, but two uses are exempt: residential accessory storage under 200 sq ft, and a container storing materials for a project with a valid building or grading permit. Exempt containers must stay out of required setbacks, parking spaces and fire lanes, sit at least 10 ft from other buildings, and remain unheated and uninhabited.
In the City of San Diego, a building permit is required to install a cargo container on a site at all, the only exception being stage sets at a permitted event. Utilities need their own permits whether the container is temporary or permanent; stacked, occupied or connected containers need a permanent foundation; and single-level containers used as homes or businesses must be anchored at all four corners, on plans signed by a licensed professional.
The model codes behind local rules
Many local building codes are adopted from the International Code Council’s model codes, with local amendments; San Diego’s bulletin, for one, points to the container section of the California code, which is based on them. In the International Residential Code, section R105.2 exempts one-story detached accessory structures of 200 sq ft or less from a building permit. The International Building Code has a section on intermodal shipping containers (3115 in the 2021 edition), which applies when a container is repurposed as a building or part of one and asks for the container’s details and a structural analysis. The residential code also spares small accessory structures from frost-protected footings: container foundation options.
How to check your rules
- Find your parcel’s zoning on the county or city GIS map, or from the planning department.
- Search the local code or the building department’s site for “cargo container” or “shipping container.”
- Ask planning: is a container allowed in my zone, for how long, how far from property lines, and does it need screening?
- Ask building: does a 20ft or a 40ft used for storage need a permit here, and does that change with power, a foundation or a door cut in?
- Check your HOA covenants.
- Keep the answers in writing, with the name of the person who gave them.
Before delivery
Anyone can buy a shipping container outright; the permit question is about where it goes and how you use it. Have any permit in hand before the truck comes, and mark the spot with the setbacks in mind: moving a container later means another delivery. The truck also needs a straight approach and firm ground, and the container a level base. Delivery and site checklist · foundation options.
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Frequently asked questions
Do I need permission for a storage container?
Often from two places: your city or county, whose zoning decides whether a container may sit on your lot and where, and whose building department decides whether it needs a permit; and your HOA, if you have one. An exemption from a building permit doesn’t lift zoning rules or covenants.
How do I find my county’s rules for shipping containers?
Look up your parcel’s zoning on the county or city GIS map, or ask the planning department. Then search the local code for “cargo container” or “shipping container”: many counties and cities publish a bulletin or an ordinance on them. If nothing turns up, call the building department and ask the questions above, and get the answer in writing.
Do HOAs allow shipping containers?
Some don’t. HOA covenants (CC&Rs) can ban containers outright, require them to be screened from the street, or limit how long one may stay, and HOA approval is separate from the city’s. Read your covenants, or ask the board, before you order.
Can I put a shipping container in my backyard?
In many places, yes, but residential property is usually the most tightly regulated. Expect setback rules, a limit on size, sometimes screening, and, past the local exemption size, a building permit. In King County, Washington, for example, a residential storage container under 200 sq ft is exempt from a permit if it stays out of required setbacks and at least 10 ft from other buildings.
Is a storage container treated like a shed for permits?
Often, yes: many building departments treat a storage container on a home lot as an accessory structure, under the same exemption size as a shed. Check the local limit, since some places set it below 200 sq ft, and whether adding power changes it.
Do shipping containers raise property taxes?
They can. Assessors may apply a fixture test: in Nevada’s guidance to county assessors, a container fixed to the land and meant to stay is real property, valued like a shed once it reaches 120 sq ft. Rules differ by state, so your county assessor has the answer for your parcel.
Sources
Local rules: King County Department of Local Services, “Cargo Shipping Containers: Building Permit Requirements” (January 2019); City of San Diego Development Services, Information Bulletin 149, “Cargo Containers” (March 2024). Model codes: International Residential Code, sections R105.2 and R403.1.4.1, as reproduced by local building departments, some of which lower the 200 sq ft limit; International Building Code (2021), section 3115, as reproduced by the Matanuska-Susitna Borough, Alaska. Property tax: Nevada Department of Taxation, Guidance Letter 11-002 to county assessors (June 2011). Temporary stays, HOAs and zoning lookups: a container seller’s guides to permits and placement. Container footprints are our arithmetic from ISO 668 sizes. This guide is general information, not legal advice; your city, county and HOA have the final word, and rules change.