A 4-bedroom house will usually need a 10x20 storage unit. If you have a lot of furniture or appliances, you may need a larger unit, such as a 10x30. If you plan to store items long-term, you may want to consider renting a climate-controlled unit, which will help protect your belongings from damage due to temperature and humidity changes. When selecting a storage unit, take inventory of the items you need to store, as well as any access restrictions at the facility (such as limited hours or stairs). You can also ask the facility manager for recommendations based on your specific needs. With a little planning, you can easily find the perfect storage unit for your 4-bedroom house.