What Size Should Your Self-Storage Unit Be?

Not sure what size storage unit you need? Discover how to choose the right self-storage space for your belongings with our simple size guide.
Written by
Storage Plus
Published on
March 22, 2025

What Size Should Your Self-Storage Unit Be?

So… how much stuff do you actually have?

We all like to think we only own “a few things.” Then moving day arrives and suddenly it looks like you’ve been running a secret furniture showroom. The truth? Choosing the right self-storage unit is less about guessing and more about being honest with your clutter.

Pick too small and you’ll be cramming boxes like Tetris. Pick too big and you’re paying rent for empty air. The sweet spot is out there — and this guide will help you find it. Or, if you want the shortcut, just plug your list into our Space Calculator and let it do the maths.

What Size Storage Unit Do I Need for Boxes?

If your “stuff” is mostly cartons, luggage, or seasonal bits, a 1.5m × 1.5m unit (about the size of a walk-in wardrobe) is perfect.

  • Fits: 15–20 medium boxes, stacked up to 2.7m high
  • Best for: Uni students, down sizers, or anyone swearing they’ll “sell it on Marketplace one day”
  • Pro tip: Don’t skimp on quality boxes. Flimsy cardboard caves in, and suddenly your “neat stack” looks like a modern art project. Pick up sturdy cartons from our packing & moving supplies.

What Size Storage Unit Do I Need for a 1-Bedroom Apartment?

Got a small flat or moving out of your share house? A 3m × 1.5m unit will do the trick.

  • Fits: Mattress, couch, TV, fridge, and 25–30 boxes
  • Best for: First-time movers, renters between leases, or that “temporary” move back home
  • Next step: Get a quick quote in under 60 seconds.

What Size Storage Unit for a 2-Bedroom Apartment?

Here’s where most customers land. A 3m × 3m unit gives you plenty of breathing space.

  • Fits: Two bedrooms’ worth of furniture, whitegoods, and 30–40 boxes
  • Best for: Couples, young families, or anyone who’s underestimated how much furniture a second bedroom actually holds
  • Upgrade option: Hate truck hire? Choose Mobile Storage (MegaBox) — we deliver the unit to your driveway, you load (or we load for you), and we take it away.

What Size Storage Unit for a Whole House?

Moving an entire household or relocating interstate? That’s 6m × 3m territory.

  • Fits: Full house contents, big furniture, appliances, bikes, business stock, and 50+ boxes
  • Best for: Homeowners, business owners, or anyone with a “garage overflow” problem
  • Check availability: See your nearest location and secure a unit before moving week sneaks up.

Should I Choose Mobile Storage or Self-Storage?

Self-storage is perfect if you like to pop in and out of your unit. But mobile storage changes the game:

  • We deliver a MegaBox to your home
  • You load it (or let our removalists handle it)
  • We pick it up and store it securely

Mobile is often cheaper because it saves you truck hire and time. Compare both options here: Mobile Storage vs Self-Storage.

Pro Tips to Save Space (and Money)

  1. Think vertical — Units are ~2.7m high, so stack boxes to the ceiling.
  2. Declutter first — Don’t pay to store broken lamps or that mystery box marked “misc.”
  3. Protect valuables — Accidents happen. Add peace of mind with Goods Protection (StoreProtect).
  4. Ask the experts — Not sure? Contact our team. We’ve seen every storage puzzle, from vintage jukeboxes to inflatable crocodiles.

FAQs About Storage Unit Sizes

How many boxes fit in a 1.5m × 1.5m unit?

About 15–20 medium moving boxes, stacked neatly.

What size storage unit is best for a 2-bedroom apartment?

A 3m × 3m unit usually does the job.

Can I fit furniture in a 1.5m × 1.5m unit?

Only small pieces (chairs, nightstands). Larger furniture needs more space.

Do storage units have height?

Yes. At Storage Plus, units are 2.4 - 3.0m high. Stacking saves dollars.

Is mobile storage cheaper than self-storage?

It depends, but mobile storage often wins once you factor in truck hire and time.

👉 For more, see our full FAQ page or check out real customer reviews.

The Cheeky Bottom Line

Your storage unit should fit your life — not cost you a fortune. Whether you’re tucking away a few boxes or a whole household, Storage Plus and MegaBox have a size that’s just right.

👉 Ready to size up your storage? Get a quick quote now

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