The Ombudsman has cleared Auckland Mayor Phil Goff's decision to grant councillors conditional access to two National Stadium reports.

Chief Ombudsman Peter Boshier said the decision was justified considering the commercial sensitivity.

In June, councillors Cathy Casey and John Watson complained to the Ombudsman about conditional access to the National Stadium and Precinct Pre-Feasibility Study and associated Funding and Delivery Study.

The councillors were offered physical copies of the full reports to be read and returned.

In his final opinion, Boshier said there was a strong public interest in making sure councillors had access to the information needed to perform their duties.

"Each case needs to be judged on its own merits," he said.

"The information in question must be carefully assessed and a balance achieved between transparency on the one hand and the need for appropriate confidentiality on the other.

"I have found the council's decision to release the information to councillors with conditions to be justified.

"This approach allowed councillors to be kept informed, while also recognising the particular commercial sensitivities of the information."

Boshier said he also looked at whether the specific conditions imposed by the council were reasonable.

"The conditions seemed pretty straightforward to me," he said.

"Councillors were asked not to make any additional copies of the information and to return the reports once they were read.

"I know other organisations impose similar controls on the distribution of sensitive information.

"A time limit on the councillors access was not introduced, and councillors could request and view the information at their desks as often as they wanted."