A fourth Nando's has been convicted of offences under the Food Act following an investigation by the Department of Health.
The franchise on Lake Street, Northbridge, has been ordered to pay a fine of $20,000 and costs of $1745 for its offences on July 12, last year.
The court found that the business failed to keep the premises and equipment clean and was harbouring 'pests'.
The news follows the Nando's restaurant located inside the Belmont Forum Shopping Centre receiving similar fines in February for offences last September.
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Stores in Nedlands and Spearwood were also fined in late 2016 for offences in 2016 and 2015 involving poor temperature control, hand-washing facilities and poor cleanliness standards.
Nando's Australia public relations manager Cath Palfreyman said after the Belmont conviction that the brand had stepped up monitoring of its restaurants.
"Nando's is obviously very disappointed with these convictions and has implemented a number of measures to ensure compliance within these restaurants," she said.
"This has included the retraining of staff so they fully understand our food safety practices and follow the approved Nando's cleaning and maintenance guidelines and requirements."
She said the restaurants had had subsequent inspections from their respective councils and were found to be compliant.