Storage size estimates are only a starting point. The space you can use depends on the shape of the belongings, whether items can be safely stacked, and whether you need an aisle for access. A nominal volume cannot show whether a long sofa will pass through the door.
Measure what matters
List large items with their packed dimensions, then estimate boxed belongings separately. Record furniture that can be dismantled, items that must remain upright and anything that cannot bear weight. Use one set of units throughout the calculation.
Check the unit itself
- Obtain internal length, width and usable height.
- Check door and corridor openings, lifts and loading access.
- Allow space to retrieve items you will need during storage.
- Follow the provider's restrictions and safe stacking guidance.
Compare more than one layout before committing to a larger unit. A slightly larger footprint can be more useful than extra height if your belongings cannot stack safely. Share the inventory with the provider and verify the unit in person where possible. Reassess the estimate after decluttering so you do not pay to store items already removed from the move.
Put it into practice
Use the storage space planner to organise your own figures or next steps. Keep its assumptions alongside your plan.