The Size Ladder, Translated to Real Homes
Storage facilities sell square feet, but you live in rooms. Here's the standard size ladder translated into what each unit actually swallows:
| Unit | Sq ft | Real-world capacity |
|---|---|---|
| 5x5 | 25 | A walk-in closet: 10–15 boxes, seasonal gear, a dresser |
| 5x10 | 50 | One room: a mattress set, small sofa, 20–30 boxes |
| 10x10 | 100 | Contents of a 1-bedroom apartment, no appliances |
| 10x15 | 150 | A 2-bedroom apartment, or a 1-bedroom plus appliances |
| 10x20 | 200 | A 2–3 bedroom house — roughly a one-car garage |
| 10x30 | 300 | A 4+ bedroom house, or a 3-bedroom plus garage contents |
Two correction factors. First, ceiling height matters: most units run about 8 feet tall, so a 10x10 is really ~800 cubic feet — if you stack. Second, these capacities assume disciplined packing; loose, unstacked loading cuts effective capacity by a third or more.
The Decision Most People Get Wrong
Renters overwhelmingly err in one direction: too big. Facilities' own sizing tools nudge upward (vacant cubic feet are pure margin), and "I'd rather have room to spare" feels prudent. But the price ladder is steep — each step up typically adds a meaningful monthly premium, and storage bills compound silently for an average of many months. Renting a 10x15 when a disciplined 10x10 would do can easily cost several hundred dollars over a typical storage stay. Our storage cost breakdown covers the published price bands per size.
The honest sizing method takes 20 minutes: list your large items (use your moving inventory if you built one), count your boxes, and compute cubic feet — boxes average 3 cu ft, a sofa ~50, a queen mattress set ~35, a washer or dryer ~15 each. Target filling 85–90% of the unit's cubic volume, not its floor area.
How to Fit a Unit One Size Smaller
Professional loaders routinely fit a "10x15 load" into a 10x10. The techniques:
- Go vertical. Stand sofas on end, mattresses on edge (in a mattress bag — against a wall, never as a load-bearing platform). Stack boxes to the ceiling: heaviest on bottom, uniform moving boxes from a kit stack far more stably than mismatched freebies.
- Disassemble everything that disassembles. Bed frames, table legs, shelving. Tape hardware bags to the furniture. A disassembled bed is a flat bundle instead of 40 cubic feet of air.
- Fill the hollow furniture. Dressers, washers, ovens, and wardrobes are free boxes — fill them with soft goods. Wrap drawers shut with stretch wrap so they travel and store without spilling.
- Leave a center aisle. One luxury worth its floor space: a walkway to the back wall. Without one, retrieving anything means unloading everything — and label every box face toward the aisle using a color-coded label system.
What Doesn't Belong in Any Size Unit
Standard prohibitions: food and perishables, hazmat (gas, propane, paint), plants, anything alive, and anything irreplaceable or wildly valuable — storage facility liability is even thinner than mover liability. For temperature-sensitive items (wood furniture, electronics, photos, instruments), the size question becomes a climate-control question, which carries its own premium covered in our storage cost guide.
Size It Once, Pay for It Monthly
The cheapest unit is the smallest one that fits a disciplined load — and the cheapest storage strategy of all is storing less. Before you rent, run the decluttering math: anything worth less per pound than it costs to store rarely earns its rent.
If storage is part of a larger move, get the full picture priced together — movers offer storage-in-transit, and bundled move-plus-storage quotes often beat self-managed combinations. Compare quotes from licensed movers and ask each to price your move with and without 30 days of storage.
FAQ
What size storage unit do I need for a 2-bedroom apartment?
A 10x15 is the standard recommendation, but a disciplined load — disassembled furniture, ceiling-height stacking, filled dressers — fits most 2-bedroom apartments into a 10x10 and saves the size premium every month.
Can a car fit in a 10x20 storage unit?
Dimensionally yes — a 10x20 matches a one-car garage. But vehicle storage requires facility permission, proof of registration and insurance, and usually a designated vehicle unit. Ask first; storing a car in a standard unit can violate the lease.
Is it cheaper to rent two small units or one large one?
Almost always one large unit — price per square foot drops as size increases. Two smalls only win when you need different terms, like one short-term unit and one long-term, or items split across two locations.
How full should I pack a storage unit?
Target 85–90% of cubic volume with a center aisle to the back wall. Packing to 100% with no aisle means full unloads for every retrieval; packing to 60% means you're renting air.
The Load Report
Seasonal rate shifts and route-band updates, flagged the month they happen — one email, no filler.