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The Complete Guide to Owning a Shipping Container

Everything you need to know to place, maintain, secure, and eventually sell a container — from people who have been delivering them for over two decades. The right start makes the difference between a container that lasts 30 years and one that causes problems in year three.

Quick Reference

The Numbers Every Container Owner Should Know

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Delivery clearance (40′) 100 ft straight, level run
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Delivery clearance (20′) 80 ft straight, level run
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Inspection frequency Once per year, minimum
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Max allowable out-of-level ½ inch across the length
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Typical 20′ resale value $1,500–$2,500 if maintained
Tip 01
Before Delivery

Site Preparation: Flat Ground Is Non-Negotiable

The most important word in container site preparation is flat — not level in the technical survey sense, but flat enough that the container sits square and the doors operate correctly. A container that lands on uneven ground will rack slightly — the corners move out of plane — and the doors that closed perfectly at our yard will bind, drag, or refuse to latch on your property.

You also need enough clear, straight run for our tilt-bed truck to back in, set the container down, and pull out. There's no room to turn around mid-delivery.

Container Size Minimum Straight Run Overhead Clearance Width Clearance Critical Notes
20′ Standard 80 feet 14 feet 12 feet Ground must be level within 1–2 inches along the full length
40′ Standard 100 feet 14 feet 12 feet Any slope along the delivery run must be gradual — no abrupt grade changes
40′ High Cube 100 feet 15 feet 12 feet Extra height requires additional overhead clearance — check for low-hanging branches and utility lines

⚠️ Conditions That Can Prevent or Complicate Delivery

If we arrive and the site isn't workable, we may not be able to complete the delivery and will need to reschedule — which involves a return trip fee. The most common issues we encounter:

  • Soft or wet ground — Our truck is heavy. Saturated soil, wet grass, or soft dirt can cause the truck to sink or get stuck. If it's been raining, check whether the ground is firm enough to support a loaded flatbed before delivery day.
  • Steep or abrupt slopes — A gradual grade is manageable. A sharp drop-off mid-run or a site that tilts side-to-side is not. The container needs to land flat; the truck needs to pull out safely.
  • Overhead obstructions — Low-hanging branches, utility lines, and overhead wires are the most commonly missed hazard. The truck and container together can require up to 15 feet of clearance on the approach.
  • Tight gates or narrow driveways — A tilt-bed truck is long. If the entry point requires a sharp turn through a narrow gate, measure it before delivery day. The minimum working width is 12 feet.
  • Gravel, mulch, or uneven surfaces — Loose surface materials can shift under the truck. Compacted gravel is usually fine; deep loose gravel or bark mulch may not be.

If you're unsure about your site, call us before we come out. Describing the site — or sending a photo — takes two minutes and can prevent a rescheduled delivery fee.

The easiest check: stand at the delivery entry point and ask yourself whether a tractor-trailer could back straight in to where the container will sit. If the answer is no, call us before we come out — we can help you figure out whether the site is workable.

Tip 02
Foundation & Placement

What You Put Under a Container Determines How Long It Lasts

Containers are engineered to bear their load at the four corner castings — the heavy steel fittings at each corner. The floor structure and walls are not designed to carry concentrated weight in the middle of a span unsupported. What this means practically: the foundation doesn't need to support the full footprint, but the corners must be supported evenly and firmly.

The other problem most owners don't anticipate is soil movement. Alabama clay expands when wet and contracts when dry. Bare-earth placement works fine on delivery day and starts causing door alignment problems six months later as the ground shifts seasonally.

🧱

Concrete Pad or Footings

Best

A poured concrete pad or corner footings is the most stable long-term solution. Footings at the four corners are sufficient — you don't need a full pad under the entire container. Keeps the container level permanently, no seasonal movement, and gives you the cleanest installation if the container is permanent.

⛏️

Compacted Gravel Base

Good

4–6 inches of compacted crushed stone under the full footprint drains well, resists movement, and distributes load effectively. Economical and widely used. Works well on properties where a concrete pour isn't practical. More stable than bare earth but requires occasional re-leveling over many years.

🛤️

Railroad Ties or 6×6 Pressure-Treated Timbers

Fair

Two parallel timbers running the length of the container — one near each side rail — keep the container off bare ground and allow for leveling with shims. Very common and workable. Timbers will eventually rot and need replacement (10–20 years depending on wood treatment and drainage). Inspect annually.

🌿

Bare Earth or Grass

Avoid

Direct ground contact accelerates corrosion on the base rail — the lowest steel member of the container. It also allows for moisture wicking and seasonal movement that causes door alignment problems over time. Fine for very short-term use. Not recommended for anything meant to be permanent.

📐 The Half-Inch Rule

A container is considered acceptably level if it's within half an inch across its full length. Beyond that, you'll start to see doors that bind or won't close flush. Use a 4-foot level placed along the floor inside the container from corner to corner to check. If you're more than half an inch out, reblock before storing anything.

Tip 03
Ventilation

Most "Container Leaks" Are Not Leaks — Here's What's Actually Happening

The most common complaint from container owners who skip ventilation is water dripping from the ceiling onto stored items. In most cases, the seals are fine and the container is not leaking. What's happening is condensation — and understanding the mechanism is the only way to prevent it.

Steel is an excellent thermal conductor. During the day, the outside surface of the container heats up in the sun. At night it cools rapidly. The air trapped inside the container holds moisture. When the steel cools below the dew point of that trapped air, moisture condenses directly on the ceiling and walls — and drips. The container is structurally sound. The seals are intact. It's physics, not a defect. The fix is airflow, not caulk.

✓ The Two-Part Solution

  • Open the doors regularly. If you access the container at least once every two to three weeks, the air exchange alone prevents significant condensation buildup. This is why containers that are used regularly rarely have condensation problems.
  • Add a roof wind turbine if you won't open it often. A spinning roof turbine — identical to those on residential and commercial buildings — creates passive airflow as wind moves over it. One turbine on a 20-foot container or two on a 40-footer handles the ventilation load without electricity or moving parts to maintain.

⚠️ Wind Turbines Must Be Installed After Delivery

We cannot pre-install a roof wind turbine before delivery because the added height would create clearance problems on our tilt-bed truck in transit. Installation takes 30–60 minutes with basic tools after the container is in place. The same rule applies to any roof penetration accessory.

For containers used as long-term storage in humid environments, you can also add desiccant bags or a small electric dehumidifier if you have a power source available. These are supplementary measures, not substitutes for ventilation. The root cause is trapped air — address the air first.

Tip 04
Rust Prevention

Rust Is Inevitable — Early Treatment Is What Controls It

Every steel container will develop surface rust eventually. The goal is not to eliminate rust — it's to catch it early, treat it before it spreads, and maintain the exterior coating that slows its progression. A container that is inspected and touched up annually can look presentable and remain fully functional for 25–30 years. A container that's ignored for five years may have repair costs that exceed its resale value.

The good news for Central Alabama owners specifically: inland containers rust far more slowly than coastal units. You're not dealing with salt air, and the climate — while humid — is significantly less corrosive than Gulf Coast or Atlantic environments.

🔍 Where Rust Starts: Know Where to Look First

  • Base rail and corner posts. The lowest steel members are most exposed to moisture from the ground. This is why keeping the container off bare earth matters.
  • Dents and impact points. Any area where the paint surface has been broken by a dent or scratch is an entry point. Treat these promptly.
  • Weld seams. The factory welds on the corrugated panels are slightly more vulnerable than the flat steel because the surface texture traps moisture.
  • Roof surface. Water that ponds in roof dents will rust from the outside in. A container with a roof dent that holds water needs attention.

🔧 The Three-Step Rust Treatment Process

  • Remove the rust. Wire brush or angle grind the affected area back to clean, bright metal. Don't paint over rust — it continues to progress underneath.
  • Apply rust-inhibiting primer. A spray or brush-on primer rated for exterior metal gives the topcoat something to bond to and slows future oxidation at the treated spot.
  • Topcoat with matching paint. Exterior metal paint in the container's original color restores the appearance and seals the repair. Rattle-can spray paint for touch-ups works fine for small spots. Large areas warrant a brush or roller with proper exterior metal enamel.

For a container that has developed significant rust over a large area, a full repaint is worth considering. The same exterior metal paint we use during our reconditioning process is available at any commercial paint supplier. A full exterior repaint — whether done yourself or by a contractor — can add years of usable life and several hundred dollars to resale value.

Tip 05
Security

A Standard Padlock Isn't Enough — And the Fix Is Simple

Every shipping container is delivered with a set of door rods — vertical steel bars that rotate to engage locking lugs and secure the doors. You padlock through the keeper (a welded hasp) on one or both door panels. The padlock prevents the rod from rotating and the door from opening.

The problem is geometry. A standard padlock has a U-shaped shackle that, when locked through the keeper, protrudes fully exposed above and below the keeper plate. The exposed shackle is accessible to bolt cutters. A determined thief with a pair of bolt cutters can be through a standard padlock in under ten seconds. The container itself is extremely difficult to breach — but the lock is the weak point.

✗ Standard Padlock Only

  • Shackle is fully exposed and accessible
  • Bolt cutters can defeat it in seconds
  • Cheap and convenient, but not adequate for anything of value
  • Fine for very low-risk locations with nothing worth stealing

✓ Lockbox + Shrouded Padlock

  • Lockbox is a welded steel housing that encloses the padlock entirely
  • No shackle is accessible — bolt cutters have nothing to grip
  • Only way in is with the key
  • We can add a lockbox before delivery — just ask at quote time

🔧 Padlock Spec for Lockbox Use

Not every padlock fits correctly in a lockbox. Look for a padlock with a "hockey puck" profile or a "hidden shackle" design — these fit inside the lockbox housing with minimal clearance. Brands like Abloy, Medeco, or Master Lock's Pro Series in the right format work well. A padlock that's too tall or has a shackle that protrudes past the lockbox lip defeats the purpose. When in doubt, bring the lockbox to a hardware store and test fit before buying the lock.

📍 Placement Tip: Doors Facing Inward

If your site allows it, position the container so the door end faces a wall, fence, or another structure rather than an open area. A thief needs working room to access the door hardware — removing that room is a passive deterrent that costs nothing and requires no hardware. Combined with a lockbox, it's a meaningful layer of security.

Tip 06
Maintenance Schedule

One Annual Walk-Around Prevents 90% of Long-Term Problems

Container maintenance has a low time commitment when done consistently. Owners who do a thorough walk-around once a year and treat issues as they find them almost never have serious problems. Those who skip annual inspection for three or four years and then wonder why the doors bind and the floor has soft spots — those are the preventable failures.

Here's the full maintenance schedule we recommend:

Annual

Full exterior inspection — all four walls, roof, and base

Walk every surface. Look for rust spots, broken paint, dents that have compromised the surface, and any areas where water may be sitting. Photograph anything that's changed from the previous year.

Annual

Lubricate door hinges, hinge pins, and locking rods

White lithium grease or a similar heavy-duty lubricant on all moving door hardware. Work the doors through their full range of motion several times after application. This is the single most effective thing you can do to prevent stiff or binding doors.

Annual

Inspect door seals

Run a finger along the full perimeter of the door gaskets. Check for cracking, flattening, or gaps. A silicone conditioner spray extends seal life. Seals that no longer seat properly are the most common source of genuine water entry and should be replaced.

Annual

Verify level

Place a long level inside the container from corner to corner in both directions. If the container has shifted more than half an inch from level, reblock the affected corner before door alignment problems develop.

Annual

Inspect floor

Walk the floor and look for soft spots, which indicate moisture intrusion or rot in the wood flooring beneath the steel subfloor. Container floors are typically 28mm hardwood (often bamboo or similar tropical hardwood). A soft spot that's caught early can be patched. Left alone, floor failure means a major repair.

Seasonal

Clear debris from roof and around base

Leaves, pine needles, and debris that accumulate on the roof or against the base rail hold moisture and accelerate rust at those contact points. Clear twice a year — spring and fall.

As Needed

Treat rust spots

Wire brush to clean metal, rust-inhibiting primer, exterior metal topcoat. Small spots take 20 minutes. Don't let them sit — a spot the size of a quarter can spread to the size of your palm in a single Alabama summer if it's left untreated.

Immediate

Address any roof dents that hold water

Standing water on a container roof will work its way through even small imperfections over time. If an impact creates a dent deep enough to pool water, seal it with a rubberized roof coating or have the panel addressed before the next heavy rain season.

Tip 07
Permits & Zoning

Know Before You Place — Permit Rules Vary More Than Most People Expect

Alabama has no statewide rule on shipping containers. Each county — and each municipality within that county — sets its own regulations, and those regulations vary more than most buyers expect. The same container that needs no permit on a rural Elmore County property may require a temporary use permit and a 90-day removal deadline in a Montgomery city neighborhood.

The general pattern across Alabama counties:

✓ Typically No Permit Required

  • Rural or agricultural-zoned property
  • Commercial or industrial property in unincorporated county areas
  • Short-term temporary use during construction (usually under 90 days with no formal application)

⚠️ Check Before You Place

  • HOA-governed neighborhoods — Many HOAs prohibit containers entirely or require removal within 30–60 days. HOA rules operate independently of county permits and are often stricter.
  • Residential-zoned properties within city limits — Most Alabama municipalities treat containers like accessory structures and require a permit or limit placement to 90–180 days.
  • Modified containers (offices, homes, commercial structures) — Almost always require a building permit and must meet applicable building codes. This applies everywhere regardless of zoning.

The right call before any container placement: call your county building department, give them your parcel number or address, describe what you're doing (temporary storage vs. permanent structure vs. modification), and ask what, if anything, is required. It's a five-minute phone call that prevents a compliance notice after delivery.

🔧 If Your County Needs Specs

Some building departments require container dimensions for permit applications. Standard specs: 20′ = 20′ L × 8′ W × 8′6″ H (standard) | 40′ = 40′ L × 8′ W × 8′6″ H (standard) | 40′ HC = 40′ L × 8′ W × 9′6″ H. All containers weigh approximately 4,800–5,000 lbs empty. Call us if you need a formal spec sheet for a permit application.

Tip 08
Resale Value

A Maintained Container Is an Asset You Can Sell — Here's How to Protect That Value

A shipping container depreciates slowly and retains real market value when maintained. The difference between a container worth $2,000 and one worth $500 — same size, same age — is almost entirely maintenance history. Buyers at every level of the resale market evaluate the same things: door operation, floor condition, rust level, and overall exterior condition.

📊 Typical Resale Value Ranges

  • 20′ container, IICL or One-Trip grade, well maintained: $1,500–$2,500
  • 40′ container, IICL grade, well maintained: $2,000–$3,500
  • Any size, significant rust, stiff doors, soft floor spots: $500–$1,000 or scrap value
  • One-Trip container, 3–5 years old, excellent condition: Close to original purchase price

The four things that protect resale value most directly: annual lubrication of the door hardware (buyers open doors first), rust treatment before spots spread (surface rust is cosmetic; rust-through is structural), keeping the container level (unlevel containers develop door problems that are expensive to fix), and keeping the floor clean and dry (a compromised floor is the most expensive repair in the container market).

🏷️ Where to Sell When You're Done

  • Local contractor networks — Often the best prices. Contractors know what containers are worth and buy often.
  • Facebook Marketplace — High reach for local buyers, but expect lowball offers and time-wasters. Price it firm and stick to it.
  • Call us — Depending on our current inventory needs, we occasionally buy back containers from previous customers. Not always, but worth a call before listing publicly.

One thing worth knowing: the resale market for containers tracks closely with new container prices and shipping demand — both of which are seasonal and cyclical. Spring and early summer tend to be the best time to sell, for the same reason they're the best time to buy. Avoid listing in October and November when demand craters due to the seasonal inventory crunch that drives retailers to pull units off the resale market.

Common Questions

Container Ownership FAQ

The questions we hear most often from buyers after delivery.

How long does a shipping container actually last?

A properly maintained container in an inland environment like Central Alabama should last 25–30 years from purchase without significant structural repair. One-Trip containers can push further. The two variables that affect lifespan most are the quality of the foundation (containers on bare earth rust faster from the bottom) and whether surface rust is treated promptly when it appears.

Coastal containers age more quickly due to salt air exposure. If you're purchasing a used container that spent years at a port facility near the coast, inspect the base rail and lower sections carefully before buying.

Can I add electricity to my container?

Yes — and it's a fairly common modification. The basic approach is running conduit through a drilled hole in the container wall (properly sealed to maintain weathertightness), connecting to an exterior power source. The container itself is an excellent electrical ground. For simple setups — a few outlets and lighting — a handy homeowner can handle it. For anything involving a subpanel, HVAC, or commercial use, use a licensed electrician and pull the appropriate permits.

We don't do electrical modifications at ASC, but we can sell you the container and leave the rest to your contractor.

Can I paint my container a different color?

Yes. Standard exterior metal paint in any color applies well to a properly prepped container surface. Sand or scuff the existing finish lightly for adhesion, apply a metal primer, then topcoat with exterior metal enamel. Spray application gives a more uniform result than rolling, though rolling works fine for a single-color full repaint.

If you want a container painted a custom color before delivery, let us know at quote time — we offer custom paint for an additional charge. If you'd rather paint it yourself after delivery, that's also a reasonable approach once it's in place and accessible from all sides.

Something is dripping inside my container. Is it leaking?

In most cases, no. The most common cause of dripping inside a container is condensation — not a breach in the seals or the steel. Steel conducts temperature, and when the metal cools below the dew point of the trapped interior air, moisture condenses on the ceiling. It drips. It looks exactly like a leak.

To confirm: run your hand along the door seals after a rain and check whether water is coming in around the door frame. Check the roof from outside for any obvious damage. If the seals feel intact and there's no visible roof damage, condensation is almost certainly the cause. The fix is improved ventilation — see Tip 3 above. If you genuinely have a seal failure, door gaskets are a relatively simple and inexpensive repair.

My container doors are stiff or hard to open. What do I do?

Stiff doors are almost always one of two things: insufficient lubrication, or the container is out of level. Try lubrication first — apply white lithium grease to every hinge and hinge pin, then work the door through its full range of motion several times. If the door improves but still sticks at the latch point, the container may have settled slightly out of level and the door frame is no longer square. Check the level and reblock if needed.

Severely stuck doors — especially on an older container — can sometimes be freed by inserting a pry bar at the lower corner of the door and applying upward pressure while rotating the handle. Once free, lubricate everything thoroughly. If the door physically won't move, call us for advice before forcing anything that might damage the hinges.

Can I stack containers on my property?

Structurally, yes — containers are designed to be stacked up to nine units high when loaded. For residential or commercial storage use, stacking two containers is common and structurally sound. You'll need appropriate lifting equipment for placement, and the lower container's foundation needs to be solid enough to handle the combined load.

The practical question is whether your local zoning allows it. Stacked containers may be treated as a structure rather than storage equipment by some local authorities, triggering building permit requirements. Check with your county building department before stacking.

Does this guide apply to containers anywhere in the country?

Most of it, yes. The site preparation requirements, foundation recommendations, ventilation mechanics, rust treatment process, and maintenance schedule apply anywhere. The permit and zoning guidance is specific to Alabama — if you're in another state, your county's rules will differ and you should verify locally. The rust timeline advice specifically (slower inland than coastal) is accurate nationally but the specific rates vary by climate and proximity to salt air. We only deliver within 100 miles of Prattville, AL, but the ownership guidance here is fully applicable wherever you are.

Ready to Get Your Container?

We deliver IICL and One-Trip grade containers throughout Central Alabama — inspected, reconditioned, and walked through with you at delivery. Get a flat, all-in quote today.

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