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Around 23% of people surveyed by the housing charity Shelter believed they had been landed with unfairly high fees for aspects of renting such as credit checks, renewing contracts and "administration".
Shelter said it had found cases of renters being charged more than £150 for repeat credit checks every year, which the charity said actually cost between £8 and £25 to perform.
It said some people were being charged £100 just to view a property and renters were being charged up to £540 in non-refundable "administration" fees.
Demand in the rental sector has rocketed as people have been unable to buy their own home, either because they cannot raise the deposit needed or meet lenders' toughened borrowing criteria in the difficult economy, which has pushed up the cost of renting.
The Royal Institution of Chartered Surveyors has warned that it is currently possible for people to set up a lettings agency without appropriate qualifications, knowledge or understanding of the rental process and it is not compulsory for them to conform to codes of conduct.
Several calls have been made for better protections for people living in the private rental sector in recent months, with Shelter reporting in September that almost a quarter of people feel they have been "ripped off" at some point by letting agents' charges.
Tenant Catherine Hall said that when she rented through a letting agent she had to pay £890 for an inventory which was "out-of-date, with missing items and a lot of damage to the property since 2007".
"I had to pay a person I'd never met, to their private bank account, with no authority that this was legal, safe or I'd ever see my money again."
A clampdown on the lettings sector is needed to stop rogue agents turning it into "the property industry's Wild West", the Royal Institution of Chartered Surveyors (RICS) has warned.
RICS said its research highlights the risks of unscrupulous lettings agents cashing in on the rental boom amid "a total lack of effective regulation".
Two thirds of more than 1,000 people who have rented a home in the last two years in England said they did not receive an inventory when they moved into their property, which RICS said showed the "worryingly low standards" tenants have come to expect.
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There has been a call for regulation of the lettings industry. Read our guide on how to avoid rogue lettings agents.