Dealing with infestations represents the most common maintenance task facing landlords, while roofing repairs will cost them the most on their investment, new research has revealed.

The analysis by Benham and Reeves has shown that on average, a landlord will be required to carry out repair or maintenance work on a buy-to-let property 72 times during their ownership, costing them over £34,000.

The research also found that the average landlord will own a buy-to-let property for an average of 109.2 months, or just over nine years. During this time, the 12 most common maintenance issues alone will see them carry out an average of 72 repairs on the property, costing them £34,314 in the process.

The most costly of the lot is repairs made to the roof, and while it is only likely to be required six times during the span of their ownership, the total cost of these repairs comes in at £3,494.

While a landlord is likely to replace or repair white goods just five times during the time they own a buy-to-let property – the lowest frequency of all repair tasks analysed – they rank as the second largest overall maintenance cost at £3,231.

Keeping the property in a fresh lick of paint may also be required just five times during ownership, but also ranks as the third largest total cost, at £2,992 on average.

However, when it comes to the most persistent problems facing the nation’s landlords, it’s household pests that rank top. Benham and Reeves estimates that during the average time of buy-to-let ownership, a landlord will have to address the issue of pest control as many as eight times, costing them a total of £2,940 in the process – the fourth highest total cost.

Mould or damp is also one the biggest bugbears, and while it ranks as one of the less expensive repairs to make at £2,752 in total, the average landlord will need to carry out mould maintenance an average of seven times during their ownership of the property.

Marc von Grundherr, director of Benham and Reeves, commented: “The long-term cost of being a landlord cannot be ignored. Anyone who is thinking of investing in buy-to-let property needs to first be aware of how ongoing outgoings will affect the overall profitability of their investment.

“However, ensuring that you’re always on top of maintenance issues is much more affordable than letting them get out of control, not least because a high-quality property reduces tenant turnover and, therefore, void periods.”