Paris, who was accompanied by a Herald reporter at the salon, did not proceed with the sunbed.
A copy of the council's fact sheet it issued to inform businesses of the changes was visible on a desk.
Owner Heike Hofer said it was out of character for her staff and that the business had been strict on the rule before it was introduced.
At Mega Sun in Ponsonby, Paris entered the salon alone and was questioned on her age straight away by a staff member who told her she could receive the service if she had a note from her doctor.
"She said the only way I could tan there is if I had something signed off by my doctor ... and that just a note would be fine."
At Eurotan in Royal Oak, Paris was again questioned on her age immediately. However, the staff member told her she could return with a guardian.
"She said, 'If you come with a parent or someone you're related to and then you could get consent'."
A council spokesman said there were no exceptions to the new bylaw, and would be looking into the Herald's findings.
"The bylaw is quite explicit on age restriction.
"It says all operators must ensure no person under the age of 18 years is permitted to use a sunbed."
Staff at Solaris in Botany Downs were quick to question Paris' age, and recommended a range of self-tanning cosmetics products as an alternative.
There was also signage about the risk of using beds.
At Body Bronze in Newmarket Paris was turned away almost immediately, and warned not to return until she turned 18.
The Health and Hygiene Bylaw and Code of Practice 2013 also has new rules for tattoo parlours, nail salons, hair removal and body piercing.