Ian McCormick, general manager building control, at Auckland Council said there was no inherent issue with other balconies in the building and put the incident down to "spontaneous failure."
"On occasion, glass can spontaneously fail, and it is probable that happened in this instance," McCormick said.
"To reduce any other risk of failure we have recommended that the property owners make a minor modification to the balustrades as recommended by glass experts."
Just months before the woman was injured the Ministry of Business Innovation & Employment amended the building code regarding glass barrier requirements.
From June, frameless glass barriers were required to have an interlinking rail unless the barrier is laminated safety glass and has features to retain panes of glass in the event of breakage.
Australia banned simple toughened glass a decade ago and uses glass that stays rigid if broken.
Because the Quest Hotel was built prior to the amendment to the building code the old balconies still comply.
McCormick wished the woman, who received broken bones in the fall, a full recovery.
"We appreciate that this has been a difficult time for the woman injured and her family, and we extend her our best wishes."