Choosing the wrong unit size is the most expensive mistake in self-storage. Rent too small and you're paying for a second unit or a rushed repack. Rent too big and you're donating $30-$80 a month to empty air — in Miami, that's up to $960 a year wasted. This guide tells you exactly what fits in every standard size, with real Miami pricing so you can budget before you book.
The Quick Answer
If you only read one paragraph, make it this one. Match your situation to a size:
- Dorm room, seasonal items, or 10-15 boxes: 5x5
- Studio apartment or furniture from one room: 5x10
- One-bedroom apartment: 10x10
- Two-bedroom apartment: 10x15
- Three-bedroom house or a car: 10x20
- Four+ bedroom house, boat, or RV: 10x30
Now let's break down what that actually looks like — and what it costs across Miami.
Small Units: 5x5 and 5x10
5x5 (25 sq ft — walk-in closet). Fits a twin mattress, a dresser, a small TV, and 10-15 boxes. This is the student favorite: FIU and UM students stash an entire dorm room here over summer break. Also perfect for seasonal rotation — holiday decorations, beach gear off-season, business files.
Miami pricing: $45-$75/month standard, $65-$95 climate controlled. On Miami Beach expect the top of that range; in Hialeah, the bottom.
5x10 (50 sq ft — large walk-in closet). Fits a queen bed set, sofa, dresser, TV, and 15-20 boxes — essentially a furnished studio apartment. Also the go-to for motorcycle storage and small business inventory.
Miami pricing: $70-$110 standard, $95-$140 climate controlled.
Medium Units: 10x10 and 10x15
10x10 (100 sq ft — half a one-car garage). The most popular size in Miami, and the benchmark for price comparisons across this site. Fits the complete contents of a one-bedroom apartment: queen bedroom set, living room furniture, kitchen boxes, and appliances. With careful packing, some two-bedroom apartments squeeze in — but it's tight.
Miami pricing: $110-$180 standard, $140-$220 climate controlled. The spread is huge: Hialeah averages $110; South Beach pushes $280 for the same square footage.
10x15 (150 sq ft — large bedroom). Fits a two-bedroom apartment or small house, including bulky items like sectionals, dining sets, and major appliances. The extra 50 square feet over a 10x10 is the difference between Tetris-stacking to the ceiling and walking down a center aisle.
Miami pricing: $140-$220 standard, $180-$260 climate controlled.
Large Units: 10x20 and 10x30
10x20 (200 sq ft — one-car garage). Fits a three-bedroom house with appliances and outdoor furniture. Critically, this is the minimum size for vehicle storage — a standard sedan fits with room to open the doors. Contractor equipment, full business inventory, and boat trailers (smaller boats) also live here.
Miami pricing: $200-$300 standard, $240-$360 climate controlled. Note: climate-controlled 10x20s are scarce — only a handful of Miami buildings offer them.
10x30 (300 sq ft — oversized two-car garage). The largest standard unit. Fits a four-to-five bedroom house, a boat on trailer, an RV, or a full commercial operation. In Miami, 10x30s exist almost exclusively west of the Palmetto Expressway — Doral, Hialeah, and Kendall have the inventory; the urban core essentially doesn't.
Miami pricing: $280-$420/month where available.
Miami-Specific Sizing Tips
Four rules that apply specifically to storing in Miami-Dade:
- Leave airflow room. In Miami's humidity, a unit packed wall-to-wall traps moisture. Budget 10% more space than a northern move would need — the airflow gaps protect your furniture.
- The aisle rule changes your size. If you'll access the unit monthly, you need a center aisle. That means a 10x10 apartment load should go in a 10x15. Storage-only (no access needed) can pack tighter.
- Climate control eats into sizing value. If climate control stretches your budget, don't downgrade size to afford it for furniture — downgrade what you store instead. Sell the particleboard bookcase; keep the solid wood dining table in the right-size climate unit.
- Vehicles don't negotiate. Measure your car, boat, or RV including mirrors, trailer tongue, and motor. A "19-foot boat" is usually 21-22 feet on the trailer — it will not fit a 10x20.
Ready to see what your size costs near you? Search Miami storage by ZIP code and filter by size — or compare prices across all 12 neighborhoods to see how far your budget goes in Doral versus South Beach.
