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Storage Unit Size Guide
How Big Is a 15x30 Storage Unit? Dimensions, What Fits, and Who It's For
Four hundred and fifty square feet with real length and real width. Room for a vehicle and a workspace, or a large home and its garage, in one unit.
Compare Every Size
- 5x525 sq ft
- 5x1050 sq ft
- 5x1575 sq ft
- 5x20100 sq ft
- 10x10100 sq ft
- 10x15150 sq ft
- 8x20160 sq ft
- 10x20200 sq ft
- 15x20300 sq ft
- 10x30300 sq ft
- 10x35350 sq ft
- 20x20400 sq ft
- 10x40400 sq ft
- 15x30450 sq ft
- 20x25500 sq ft
- 20x40800 sq ft
- 30x401,200 sq ft
Other Space Types
On This Page
- What a 15x30 Storage Unit Actually Is
- What Fits in a 15x30 Storage Unit
- What Does Not Fit in a 15x30 Storage Unit
- Who a 15x30 Storage Unit Is Right For
- How to Know If You Should Size Up or Down
- How to Pack a 15x30 Storage Unit Efficiently
- Climate-Controlled or Standard: Which 15x30 to Choose
- What a 15x30 Storage Unit Costs and How to Think About Value
- Frequently Asked Questions
- Reserve a 15x30 Storage Unit Near You
Section 01
What a 15x30 Storage Unit Actually Is
A 15x30 measures 15 feet wide by 30 feet deep: 450 square feet of floor, or a rectangle 180 inches by 360 inches. At the 8-foot minimum ceiling that is 3,600 cubic feet, and more in the taller units.
This is the size that stops forcing a choice between length and width. A 10x30 gives you the depth but only ten feet across. A 20x20 gives you the width but stops at twenty feet. A 15x30 gives you thirty feet of depth for a vehicle or long materials, and still leaves a working bay beside it rather than a squeeze.
The Floor, Drawn to Scale
Looking straight down, here is the floor at true proportion with one layer of 18-inch medium cartons across it. Ten fit across the 180-inch width and twenty run down the 360-inch depth, giving two hundred per layer.
360 in / 30 ft deep · door on left wall
Two hundred medium boxes per layer. Five safe layers gives about 1,000 boxes, if the unit holds nothing else.
The Unit in Three Dimensions
Square footage undersells a unit this size, because what you are renting is volume. Both cutaways below show the same 15x30 at the same scale. The only difference between them is how the boxes are stacked.
Stacked five layers high
One layer on the floor
At this size the gap between those two drawings is enormous. Packing to head height rather than waist height is worth more square footage than most renters would ever pay for.
A Vehicle and a Bay, Not a Vehicle in a Tunnel
Park a vehicle down one side and you still have roughly seven feet of clear width beside it, running the full thirty feet. That strip is the whole reason to choose this shape: it is enough for racking, materials or a second narrow item, with room to walk.
Section 02
What Fits in a 15x30 Storage Unit
What Thirty Feet of Depth Takes
- Any passenger vehicle, including crew-cab pickups at around 250 inches, with room to spare.
- A boat on a trailer up to about 26 to 28 feet overall, measured including the tongue.
- Travel trailers and pop-ups under about 28 feet, subject to door height.
- Two vehicles nose to tail down one side, with the second one blocked in.
- Stock lumber, pipe, conduit and trim in lengths to about 28 feet.
- A vehicle plus racking down the opposite wall, which is the configuration most contractors want.
Check the Door, Not Just the Floor
Interior dimensions are only half the question. The roll-up door opening is narrower and lower than the unit itself, and at this size it is what actually decides whether a tall vehicle, a van with roof equipment or a trailer will go in. Confirm the door opening at the specific facility before booking anything close to the limits, particularly on height.
Storing a vehicle also carries requirements that storing goods does not: proof of current registration and proof of insurance. Motorised vehicles must be operable and free of leaking fluids. Towable trailers, including travel trailers, fifth wheels, pop-ups and utility trailers, do not need to be operable. Our vehicle storage page has the detail.
A Large Home and Its Garage
As a household benchmark, a 15x30 takes a six-bedroom home complete, including appliances, garage contents, patio furniture and yard equipment, with 300 to 350 cartons and a full-length aisle. If a vehicle is going in as well, that is comfortable here rather than a compromise.
Shelving and Racking
A 15x30 has 90 linear feet of wall. Shelving along both 30-foot walls and the 15-foot back gives 75 linear feet of run, and at five shelves high that is about 375 linear feet of shelf. Our business storage page covers commercial use.
Section 03
What Does Not Fit in a 15x30 Storage Unit
Beyond This Size
- Full-size Class A motorhomes, and anything over about 28 to 30 feet. Height usually rules them out before length does.
- Two vehicles side by side. Fifteen feet is wide enough for two cars only without working clearance; for that use a 20x20 or 20x40.
- Anything taller or wider than the door opening, which is lower and narrower than the unit.
- Forklift operation. A pallet jack works in a 15-foot width; a forklift does not turn.
Vehicles and Prohibited Items
- Vehicles without documentation. Proof of current registration and proof of insurance are required, and motorised vehicles must be operable with no leaking fluids.
- Flammable, combustible or hazardous materials: gasoline, propane, paint, solvents, fireworks, ammunition. This catches out contractors and equipment owners more than anyone, so drain fuel before storing.
- Perishable goods, or anything that attracts pests.
- Living things, including plants and animals.
- Anything illegal or stolen.
- Occupied or operational use. A storage unit is not premises. No working from inside it, no customers, no utilities.
If the Vehicle Is the Whole Job
If you are storing one RV, boat or trailer and nothing else, an enclosed unit this size is usually the wrong product rather than the wrong size. Dedicated parking is sized by length, has no door opening to negotiate, and costs less.
Choose a 15x30 when you need the vehicle and a working bay beside it, or when enclosure genuinely matters. See our RV storage and boat storage pages for the alternative.
Our full storage FAQs cover prohibited items in detail, and your rental agreement is the controlling document. At this size, where a unit may hold an entire inventory or a vehicle, read the agreement rather than relying on a general guide, including this one.
Section 04
Who a 15x30 Storage Unit Is Right For
Contractors Storing a Work Vehicle and Materials
The defining case. Van or trailer down one side, racking and stock down the other, and thirty feet of run for long materials. With 24/7 gate access and month-to-month terms this replaces a yard without a lease.
RV, Boat and Trailer Owners Who Want Enclosure
For a trailer or boat under about 28 feet, an enclosed 15x30 keeps weather and sun off entirely, and leaves room for the gear that goes with it: covers, tackle, outboard, hitches and seasonal equipment.
Households Storing a Large Home Plus a Vehicle
Six bedrooms and the garage, with a car or truck stored alongside rather than in a second unit. One rental, one gate code.
Businesses With Long Stock
Lumber yards, sign makers, flooring installers, event and staging companies. Anything that arrives in 20-foot lengths needs depth, and needs width to get it off the rack.
Estate and Relocation Situations
When a large property has to be cleared at once so it can be listed or sold, a 15x30 takes the house and the garage in a single move. Our storage scenarios pages cover these.
Section 05
How to Know If You Should Size Up or Down
Length and Width Are Separate Questions
Work out the longest thing you are storing first, then ask how much room you need beside it. Those two answers land you on a size faster than square footage ever will.
A 15x30 Is Right If Any of These Are True
- Something you own is 20 to 28 feet long
- You need a working bay beside a stored vehicle
- You are storing a large home plus a vehicle
- Your stock arrives in long lengths and lives on racking
- You want enclosure rather than open parking
Choose Something Else If Any of These Are True
- The vehicle is the whole job, which wants a parking space sized by length
- You need two vehicles side by side, which wants a 20x20 or 20x40
- Nothing is longer than 20 feet, which fits a 15x20 for less
- You will not open the unit and a 10x30 is cheaper
- Your RV is over 30 feet, which no enclosed unit will take
Price Two Units Against One
The cost per square foot curve flattens at the top of the range, so a 15x30 is not automatically cheaper than a 10x30 plus a parking space. If your contents split cleanly between a vehicle and everything else, that combination is often both cheaper and more practical.
Our storage size calculator builds a recommendation from an item-by-item inventory.
Section 06
How to Pack a 15x30 Storage Unit Efficiently
Four hundred and fifty square feet in a long shape rewards planning and punishes improvisation, because anything at the back is thirty feet behind whatever went in after it.
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Plan the Layout Before Anything Arrives
At this size an unplanned load wastes more space than most people rent in total. Decide where vehicles, racking, heavy equipment and boxes go before the first item comes off the truck, and tell whoever is helping.
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Racking Beats Stacking, Decisively
Freestanding shelving or pallet racking along the walls turns floor area into usable volume and keeps everything individually reachable. Above about 300 square feet this is the single highest-return decision you will make.
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Keep a Full-Length Aisle, and a Turning Space
Run a clear path from the door to the back wall, and leave enough room near the door to turn with a hand truck or pallet jack. Losing roughly a third of the floor to access is the correct trade on a unit you will visit.
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Heaviest and Least Needed at the Back
Equipment, appliances and archive stock go furthest from the door. They are also the sturdiest platforms to stack against.
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Build Upward to About 80 Inches
Uniform cartons reach roughly 80 percent volume efficiency against 55 percent for mismatched sizes. On a unit this large that difference is measured in hundreds of cubic feet.
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Prepare Vehicles and Fuel-Powered Equipment First
Drain mowers, generators and power equipment, since fuel is not permitted inside. For a stored vehicle, clean it, inflate the tyres, and disconnect or tend the battery.
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Load in Lanes, Not Layers
Treat the unit as two lanes running its full length: one for the vehicle or long items, one for racked storage and access. Deciding which side is which before you start is what keeps the back thirty feet reachable.
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Photograph Each Zone and Keep the Map
On a rental this size, running for a year or more, a few phone photos taken the day you load will save hours later. Label cartons on the face that points at the aisle.
Our full storage tips guide goes further on protecting furniture and preparing equipment for storage.
Section 07
Climate-Controlled or Standard: Which 15x30 to Choose
We offer 15x30 space in both standard and climate-controlled configurations, though availability varies by location and climate control is less common at this size.
Standard Unit
Enclosed and secure, keeping weather and direct sun off everything inside. Interior temperature tracks the outside temperature, which across much of our footprint means well over 100 degrees in summer and below freezing in winter.
Fine for:
- Vehicles, trailers and towable equipment
- Tools, machinery and contractor materials
- Plastic totes, metal shelving and durable goods
- Lumber, fixtures and non-perishable stock
Climate-Controlled Unit
Temperature-regulated, holding an interior range year round. That protects against the extreme heat and hard freezes that warp wood, crack vinyl, degrade adhesives and damage electronics.
Worth it for:
- Electronics, screens and anything with a battery
- Wood furniture, cabinetry and millwork
- Business records, artwork and instruments
- Products with a temperature-sensitive shelf life
An Honest Limitation Worth Knowing About
Climate control at our facilities means temperature regulation. It does not mean moisture management, and we do not want anyone assuming otherwise on the strength of the name.
Temperature and moisture are two different threats. If you are storing something genuinely moisture-sensitive, such as documents, leather, upholstery, electronics or finished millwork, a temperature-regulated unit addresses one of those and not the other. Handle the second yourself: seal items in airtight containers rather than cardboard, add desiccant inside them, and keep everything off the concrete on pallets or risers. Those steps cost very little and do more for moisture-sensitive goods than any unit type will.
At this size, where a single tenant may be storing an entire inventory, that distinction is worth acting on rather than noting.
More detail is on the climate-controlled storage page.
Section 08
What a 15x30 Storage Unit Costs and How to Think About Value
What a 15x30 costs depends on your market, the specific facility, whether the unit is climate-controlled and what is available when you book. Rather than publish a range that goes stale, we point you at live pricing for the locations near you.
The Cost Logic That Does Not Change
- Larger units cost less per square foot, but the curve flattens at the top of the range. The saving from stepping up is real between small units and much smaller between large ones.
- Availability is the real constraint at this size. There are far fewer of these than there are 10x10s, and they do not come free often. If one is available where you need it, that matters more than a small price difference.
- Compare against commercial rent, not against other units. For a business, the useful comparison is the price per square foot of warehouse or flex space in your market, plus its lease term, deposit and build-out. This is usually not close.
- Two units can beat one. Check a 15x30 against two 10x30 units at the locations near you. One is simpler; two are sometimes cheaper and let you separate what you need from what you do not.
What Is Included, and One Thing We Cannot Do
Every rental includes a free lock, month-to-month terms with no long-term contract, and 24/7 gate access at nearly all locations. A protection plan is required at checkout at all of our facilities. Check first whether your existing business or homeowner policy already extends to goods stored off premises, and read your rental agreement for what the plan does and does not cover.
Our facilities are fully automated and unstaffed. You rent online, your gate code arrives by email and text, and you go straight to the unit. Because nobody is on site, we cannot accept deliveries on your behalf. That matters more at this size than any other, because businesses renting 15x30 space often assume inventory can be shipped straight to the unit. It cannot. If your operation depends on that, this is not the right fit, and it is better to know now. More on how our facilities work is on the why choose 10 Federal Storage page.
How Big Is a 15x30 Storage Unit?, Frequently Asked Questions
A 15x30 is 15 feet wide by 30 feet deep, for 450 square feet of floor. At the 8-foot minimum ceiling that is 3,600 cubic feet, and more in units with taller clear heights.
About 1,000 medium cartons wall to wall, five layers high, with nothing else inside. Leave a full-length aisle and the figure is 690 to 700. Alongside a large household and a vehicle, plan on 300 to 350.
Smaller ones. Travel trailers and pop-ups under about 28 feet may fit, but full-size Class A motorhomes will not, and height is usually the constraint before length because the door opening is lower than the ceiling. For larger RVs a dedicated space sized by length is the better product.
A boat on a trailer up to about 26 to 28 feet overall will fit, measured including the trailer tongue rather than the hull. Confirm door opening height for anything with a tower, arch or tall console.
Yes, and that is the main reason to choose this size. A vehicle down one side leaves roughly seven feet of clear width running the full thirty feet, which is enough for racking or materials with room to walk.
Both give thirty feet of depth. A 10x30 is a ten-foot corridor and costs less. A 15x30 adds five feet of width, which is the difference between a vehicle wedged in and a vehicle with a working bay beside it.
Eighteen to twenty-two standard pallets on the floor with room to move between them, and considerably more if racked. A pallet jack turns in a 15-foot width; a forklift does not.
Between 8 and 10 feet depending on the building. Figures on this page use the 8-foot minimum so they hold everywhere. Confirm the specific unit if you are storing something tall, and remember the door opening is lower than the ceiling.
Shelving along both 30-foot walls and the 15-foot back gives 75 linear feet of run, and at five shelves high that is about 375 linear feet of shelf.
It depends what is going in. Choose temperature regulation for electronics, wood, documents and temperature-sensitive stock. A standard unit is fine for vehicles, tools, lumber and durable goods. Our climate-controlled units regulate temperature only, so seal moisture-sensitive goods either way.
Reserve a 15x30 Storage Unit Near You
The 15x30 is the size that stops forcing a choice. Thirty feet of depth takes a vehicle or a trailer, and fifteen feet of width leaves a working bay beside it rather than a squeeze. For a contractor storing a work vehicle plus materials, or a household storing a large home plus a car, it does in one unit what smaller sizes need two to do.
See available 15x30 units and pricing Compare all unit sizes
