The company's earnings before exceptional items for the year ended October 2008 increased 10.9 percent to 45.1 million pounds ($65.36 million) on sales that were up 11.5 percent at 82.9 million pounds.
The average rate the company charges per square foot rose by 11.6 percent to 24.06 pounds during the year, the group said. The company said it would increase the total dividend to 4.65 pence from 4.5 pence.
"While Safestore is not immune to the broader economic downturn, the resilience of the company's performance demonstrates its wide cross section of both domestic and business customers and that Safestore is not wholly reliant on the housing market," Chief Executive Steve Williams said in a statement.
The consensus forecast from Reuters Estimates was that, on average, analysts expected the company to post earnings of 34 million pounds for the year.
Safestore, which generates much of its revenue from house movers, said it was getting less business from people moving but said those doing so were storing goods for longer periods of time.
However, closing occupancy was 2.72 million square feet, a fall of 6.7 percent from October 2007, the company said.
Safestore opened nine new self-storage facilities during the period and plans to open five more in 2009.
Shares in Safestore, which have underperformed the FTSE All Share index by over 50 percent in the last three months, closed at 60 pence on Monday, valuing the company at 113 million pounds.
Source: Reuters, Safestore FY Earnings Up