Builders moved on to the Willow St library last weekend to start work on extending the stairs and lift as part of a $3 million overhaul that started in October and is due to take about eight months.
Construction workers used jackhammers to lift asphalt off the old carpark so another
floor could be created at the library, which closed last weekend and will reopen on Monday.
But people working opposite in Wharf St said the noise had been unbearable.
When drilling started at 7am on Sunday, it prompted the owner of the Harbour City Motel to go across the road and tell workers to stop until 9am.
Rod Aikin said it was far too early to start work and managed to persuade the construction crew to comply.
Mr Aikin said the council had done a good job at telling him about the work but said he had not been told what time of day the work would start and finish.
Other workers on Wharf St claim the council did not tell them about the work.
Ginel Holloway, duty manager at Rossco's Cafe & Bar, said the first she knew about the construction project was when she saw builders turn up for work.
Miss Holloway said work ran from 7am to 7pm on Monday and her trade had been affected. "The work is extremely noisy and only stops when they have breaks.
"Usually we have people sitting outside but no-one wants to because of the noise," Miss Holloway said. "We have had quiet days since it started and I would put it down to the noise."
Vicki Crosby at House of Rugs, which is next to Rossco's, said she could not hear herself think at work during the drilling.
"It is a continual ringing in your ears from it. I do not think we were told about it. The first I heard about it was when it started.
"It has become a bit of a conversational opener for customers because it is so loud."
Chartered accountant Raewyn Taylor, whose office is next to Baycorp, said she had not been told about the work.
"I went into Rossco's for a coffee and the noise from the drilling was terrible.
"I do not think we should have been told but I think businesses downstairs should have been."
City council property manager Anthony Averill said local businesses had been consulted in the past on work at the library.
Mr Averill said he knew the motel had been consulted but said he could not be sure about the cafe.
"It is fair to say it was an oversight on our part not to talk to the other businesses. We did not think the noise would have an impact on them."
Mr Averill said he hoped the drilling work would be completed this week.
Builders moved on to the Willow St library last weekend to start work on extending the stairs and lift as part of a $3 million overhaul that started in October and is due to take about eight months.
Construction workers used jackhammers to lift asphalt off the old carpark so another
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