Storage units are the property asset most ignored by private investors, and the one with some of the best gross yields in urban areas. A 5m² storage unit in Madrid lets for €60-120/month and can be bought for €5,000-18,000. That's a gross yield of 8-15%. And with no problem tenants, no renovations and no maintenance costs.
Why demand for storage units is growing
Flats are getting steadily smaller: the average size went from 105m² in 2005 to less than 90m² in 2025. Households and small businesses (e-commerce, resellers) are looking for affordable external storage.
The market in numbers (2026)
Platforms such as Bluespace and peer-to-peer apps have created an organised market. In Madrid, a 5-8m² storage unit in a residential building: €60-100/month. One of 15-20m²: up to €150-250/month. The purchase price at auction can be well below the market.
How to find storage units to buy
- Court auctions: they often come up alongside repossessed homes
- Bank-owned property: the servicers (the companies that manage and sell the banks' properties) sometimes sell them separately
- Owners' associations with storage units they want to sell
The risks to consider
Bank financing for storage units is very limited (it's a cash investment). They are less liquid assets than homes: the pool of buyers is smaller.
Look for storage units at auction: Go to RadarPro to see storage units and garages available at auction, with yield analysis. Also read the guide to investing in garages.
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