Since April there have been 19 complaints over noxious smells coming from the Banham Poultry's Attleborough plant, up from just five complaints last year.
The figure was reported to the town council by deputy mayor Vera Dale, who visited the Station Road site to discuss residents' concerns over the pong.
Mrs Dale said it was a productive meeting, and Banham's representatives were up-front about the bad smells and the poor appearance of the site.
Speaking at a council meeting at Attleborough Town Hall on Monday, Mrs Dale said: 'They admitted that they've had problems with the bad smells. And their comment was they were embarrassed about the look of it when they bring people in.
'They didn't brush anything under the carpet.'
She said the firm had also signed a new deal to sell chicken offal to a pet supply company, and so they needed to avoid it going off. Mrs Dale said Banham's environmental facilities officer Richard Rowles had offered to conduct testing for any residents who had problems with the smell.
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