Choosing the right storage unit size.

Don't trust your guess

Most people overestimate the volume of their stuff by 30–50%. The garage looks full, but when packed properly into a storage unit, the same contents take noticeably less space. Pack tightly, stack vertically (units are usually 2.4–2.9 m tall), and you'll fit more than you think.

How storage units are described

Storage in Australia is sold by floor area in m², but the volume that matters is m³. Always check ceiling height. A 5 m² unit at 2.9 m high holds about 14.5 m³. The same 5 m² at 2.4 m high holds about 12 m³ — 17% less, same price.

At our facility, all units are 2.9 m high, so the floor area is the only variable.

The three common sizes

Small (around 5–6 m²)

Roughly the size of a single garden shed or a cosy walk-in wardrobe. Holds:

• Contents of one bedroom (mattress, frame, dresser, boxes)
• Garden tools, mower, outdoor furniture
• 20–30 medium boxes plus a couple of armchairs
• Seasonal items: holiday decorations, sports kit, camping

Typical scenario: decluttering, seasonal items, single-room furniture.

Medium (around 7–10 m²)

Roughly the size of a small box room or large garden shed. Holds:

• Contents of a one-bedroom flat (lounge, dining, bedroom, kitchen items)
• Whitegoods (fridge, washing machine) plus furniture for 1–2 rooms
• Renovation overflow for a 3–4 bedroom home (one room at a time)
• Small business stock for a market trader or e-commerce side-hustle

Typical scenario: renovating, moving from a one-bed flat, business inventory.

Large (around 12–15 m²)

Same footprint as a 20-foot shipping container. Holds:

• Full contents of a 2–3 bedroom home, packed sensibly
• Significant business inventory or contractor gear
• Furniture from a full house renovation
• Vehicle plus ancillary gear (depending on facility's vehicle rules)

Typical scenario: full-home moves, business operators, contractors.

Common scenarios — what to pick

Renovating one room while staying in the house

Small. You don't need to clear the whole house, just the room being worked on.

Renovating a kitchen or bathroom

Medium. Cabinetry, appliances and the contents of two adjacent rooms add up fast.

Moving from a rental to a house being built

Medium for a one-bed; large for a family home. Add a month buffer for build delays (they always happen).

Storing the contents of a deceased estate

Large. You'll want everything in one place while sorting through and decisions are being made.

Side-business inventory or seasonal stock

Start with small. You can always upsize later (most facilities will move you up if a larger unit becomes available).

Pack-smart tips that save you a size

1. Disassemble big furniture. Bedframes, dining tables, bookcases — flat-packed they take 1/3 the space.
2. Use the height. Stack boxes to the ceiling. Heavy on the bottom, light on top.
3. Fill the inside of furniture. Drawers, washing machines, fridges — fill with soft items (linen, clothes).
4. Use wardrobe boxes for clothes on hangers. Faster to pack and unpack, and hangers don't tangle.
5. Standardise box sizes. They stack better. A bunch of mismatched boxes leaves dead space.

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