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Conex Box in Michigan: A Complete Guide for Michigan Buyers
Conex box, shipping container, storage container: the words get used interchangeably. What changes from one Michigan order to the next is the size, the grade and the delivery route.
The word conex (sometimes spelled CONEX) is short for "container express," a term coined by the United States military in the 1950s for a standardized steel shipping container used to move equipment and supplies during the Korean War. The original CONEX boxes were 8.5 feet by 6 feet by 6.8 feet, much smaller than today's intermodal units, but the principle was identical: a stackable, lockable, weatherproof steel box that could move by truck, rail, or ship without unpacking.
By the late 1960s the commercial shipping industry had standardized on 20-foot and 40-foot intermodal containers, the units you see on every cargo ship and rail line today. The military term stuck in everyday speech. Many people still call any large steel storage box a conex, even when the unit is technically an ISO shipping container or a purpose-built storage container.
Whichever name is used, the container is a corrugated steel box, 20 or 40 feet long, with cargo doors on one end.
Conex Box vs Shipping Container vs Storage Container
The vocabulary lines up like this:
Conex box. Originally a military-spec container. In modern use, a colloquial name for any steel shipping container used for storage. Most commonly applied to 20-foot and 40-foot units in residential and contractor settings.
Shipping container. The technical term for an ISO-standard intermodal container. These are the units that cross oceans on cargo ships. They are built to ISO 1496 specifications, which dictate dimensions, lifting points, and structural strength.
Storage container. A general retail and rental term used by ground-storage companies. Often refers to the same intermodal unit, but the phrase also covers purpose-built ground-level containers that have never seen ocean service.
If you are shopping for storage, the difference rarely matters. The same physical unit can be sold as any of the three. What matters more is the size, the condition grade, and the delivery logistics.
Standard Conex Box Sizes
There are three standard sizes:
20-foot standard. Length 20 ft, width 8 ft, height 8 ft 6 in. Interior floor about 19 ft 4 in by 7 ft 9 in, with 7 ft 10 in of height.
40-foot standard. Length 40 ft, width 8 ft, height 8 ft 6 in. Roughly 2,350 cubic feet, double the 20-foot. Best for contractors, farms, and businesses.
40-foot high cube. Length 40 ft, width 8 ft, height 9 ft 6 in. The extra foot of headroom adds about 350 cubic feet of usable space, which matters when you store racked goods or tall equipment.
Specialty sizes (10-foot, 45-foot, refrigerated, double-door, side-opening) exist but are less common.
Common Uses by Industry
In Michigan, containers can serve these industries:
Automotive and the supplier base. Assembly plants and stamping, tool and die, and tier one supplier shops operate across Wayne, Oakland, Macomb, Genesee and Ingham counties, and the extra height of a 40ft high cube suits racked parts storage.
Battery and electric vehicle manufacturing. Plants for battery cells and components are located in the Lansing area, at Marshall in Calhoun County, and at Holland on the lakeshore, and a plant build can use containers for tools and materials on site.
Agriculture is varied. Sugar beets and dry beans across the Thumb and the Saginaw Valley, tart cherries on the Old Mission and Leelanau peninsulas, apples along the Fruit Ridge north of Grand Rapids, blueberries in Van Buren and Allegan counties, asparagus in Oceana County, celery and onions on the muck ground, and dairy through the middle of the state. Each of those can use seasonal storage that locks and stays dry.
Office furniture manufacturing in West Michigan. The cluster around Grand Rapids, Zeeland and Holland makes contract furniture, and the plants, showroom builders and freight brokers around them can use containers for overflow storage.
Food and beverage processing. The cereal plants at Battle Creek, baby food at Fremont, pharmaceutical and medical device operations at Kalamazoo and Portage, and craft breweries and distilleries around Grand Rapids and Kalamazoo can keep packaging, ingredients and seasonal inventory in containers.
Timber and forest products. Pulp and paper mills in the Upper Peninsula, hardwood and pine logging across the northern Lower Peninsula, and the chip and sawmill operations that feed them can use containers at landings, gates and equipment yards well away from any paved road.
Mining and quarrying. Iron country around Ishpeming and Negaunee, a nickel and copper operation north of Marquette, and the large limestone quarries on the Lake Huron shore at Rogers City and the north Lake Michigan shore can use containers to keep parts, tooling and consumables stored close to the pit.
Great Lakes shipping and recreational boating. The Soo Locks, the Port of Detroit, the Port of Monroe and the freighter trade sit alongside recreational boating, and marinas, boatyards and winter storage operators from Lake St. Clair to Grand Traverse Bay can use containers for gear, shrink wrap, engines and hardware.
Tourism, cottages and short term rentals up north. Ski hills, snowmobile clubs, marinas, campgrounds and cottages from Ludington and Traverse City across to Alpena keep seasonal gear that has to survive a winter unattended, and a lockable steel container is one way to store it.
Higher education. Ann Arbor, East Lansing, Kalamazoo, Mount Pleasant, Big Rapids, Marquette and Houghton are campus towns where property managers, storage operators and contractors can use containers to hold furniture and equipment between move-out and move-in.
Construction, remodeling and the trades. Framers, roofers, electricians, excavators and remodelers can keep tools and materials in a lockable box on a job site through a Michigan winter.
Common uses:
Tool, chemical, and equipment storage at working yards. Steel walls, lockable doors, and on-site placement make a conex a practical substitute for a built shed, a fenced compound or a temporary office.
Weather-event storage for documents, heirlooms, and inventory.
Construction jobsite storage on long-cycle builds. Project-driven needs where timing, access, and short-term affordability all matter.
Acreage and farm storage. Permanent storage for the things a garage or barn cannot fit.
How to Choose the Right Conex Box
Three questions narrow the decision quickly:
How much space do you need? List what you intend to store. A 20-foot unit works for household goods during a renovation, materials for a residential framing job, or a few pallets of stock. A 40-foot unit doubles that. Compare the list with the container dimensions before you choose.
How clean does the interior need to be? If you are storing tools, equipment, or boxed goods, a used wind-and-water-tight unit is fine. If the unit will be converted to an office, a workshop, or a clean storage space, a one-trip unit saves the cost of repainting and floor refinishing later.
Will it move? If the container will sit on a single property for the whole life of its use, buying makes sense. For a project that ends in a few months, compare the cost of renting from a rental company with the cost of buying. Our rent vs buy guide walks through the crossover math.
How Delivery Works in Michigan
Conex boxes are delivered on a tilt-bed (sometimes called a roll-off) truck. The driver tilts the bed up, and the container slides off onto your placement site. Delivery follows this sequence:
Site assessment. Container One reviews the access route, the placement spot and the overhead clearance before scheduling. A 20-foot delivery needs 110 feet of straight clearance. The truck needs at least 15 feet of height to drive, at least 22 feet of height along the entire unloading path, and at least 10 feet of width. A 40-foot delivery needs 130 feet of straight clearance.
Surface check. Concrete, asphalt, gravel, hard-packed dirt, and grass all work. Soft, waterlogged, or steeply sloped ground may need preparation.
Final placement. The driver sets the container down on the prepared spot.
Container One's Delivery/Dispatch department schedules each delivery after payment and site review. Delivery areas across Michigan:
Detroit, Wayne, Oakland and Macomb counties and the rest of southeast Michigan, served from the Detroit area depot about 18 road miles out
Lansing, East Lansing and the Ingham, Eaton and Clinton tri-county area, served from the same Detroit area depot about 82 miles up I-96
Grand Rapids, Kent and Ottawa counties and the West Michigan lakeshore, served from the same depot about 148 miles across I-96
Permits and Local Rules
Permit rules depend on the municipality. Before ordering, check with your local building or planning department, and verify HOA rules if they apply. The permit guide for this state covers the questions to ask: container permits in Michigan.
What a Conex Box Costs in Michigan
Pricing is ZIP-specific, because delivery is part of the price. Michigan delivered pricing: starting at $2,067 for a 20ft Wind and Water Tight container delivered in Detroit. Prices as of 2026-08-06.
If you would rather spread the cost, rent-to-own is available through a third-party partner, My Container Rental.
Frequently Asked Questions About Conex Boxes
Conex is short for Container Express, a United States military term from the 1950s for the reusable steel boxes that moved supplies. The name stuck long after the original program ended. Conex box is the military-era term. Intermodal container and storage container are the other two names, and for buying purposes the three words describe the same thing.
A 20ft container is 160 square feet and needs 110 feet of straight, level run for a tilt bed to slide it off. A 40ft container is 320 square feet and needs 130 feet. Two 20ft boxes can fit a site that cannot take a 40ft, and they give you two doors and two locations.
No, and in Michigan the difference has legal weight rather than being a vocabulary point. A moving pod is a lightweight box a company drops off and picks up. A conex box is a steel intermodal shipping container you buy and own. The Grand Rapids temporary rule applies to portable residential storage containers, capping them at 150 square feet and 16 feet overall length. A standard 20ft container is 160 square feet and 20 feet long, so it is over on both counts. When you call a zoning office, say which one you are actually buying, because the two are handled by different sections.
Three things, and they are worth checking before you book rather than on the day. A straight, level run for the tilt bed, 110 feet for a 20ft container and 130 feet for a 40ft. Clear height over the whole approach, because the bed has to rise, so overhead service drops and low limbs matter as much as a tight gate does. And firm ground that will carry a loaded truck, which in winter means a cleared drive and in spring means knowing whether your road is under a weight restriction. Walk the route from the street to the drop spot, and look up as well as down.
Wind and Water Tight suits storage, because it is dry inside, carries a 5 year warranty and costs less than Cargo Worthy and One-Trip. One-trip is the choice when the box will be visible from a street, insulated, or converted into anything, because you are starting from sound steel and factory paint rather than repairing a working surface. Economy has a place on a yard or a farm where appearance does not matter and the 1 year roof leak warranty is enough. In Michigan the grade decision leans a little harder toward the better paint than it does in a dry climate, because road salt and a wet freeze and thaw winter are unkind to a coating that already has breaches.