The civil engineer behind the Canterbury Television building which collapsed in the killer 2011 Christchurch earthquake has been cleared of misleading New Zealand's professional engineering body.

The Institution of Professional Engineers (Ipenz) lodged a complaint in December 2012 against Dr Alan Reay of Christchurch design firm Alan Reay Consultants which was responsible for the six-storey Christchurch office block which collapsed in the February 22, 2011 earthquake, claiming 115 lives.

Ipenz believed Dr Reay had failed to disclose his involvement in the design and construction of the CTV building when he applied for registration in April 2011 - just two months after the building he'd been responsible for designing in the mid-1980s had collapsed catastrophically.

Dr Reay denied the allegations.

The CTV building collapsed in the February 2011 earthquake, killing 115 people.
The CTV building collapsed in the February 2011 earthquake, killing 115 people. Geoff Sloan

A ROYAL Commission of Inquiry into the Canterbury earthquakes criticised Dr Reay for giving his inexperienced structural engineer David Harding "sole responsibility" for the building's mid-1980s design.

Dr Reay was also criticised for not reviewing his designer's final plans.

Last year, he resigned from Ipenz and avoided its disciplinary process.

Now, Ipenz says it accepts a decision by an independent disciplinary committee to dismiss its complaint against Dr Reay's registration as a chartered professional engineer following the quakes.

The committee concluded there was no duty on Dr Reay to disclose his firm's role in the design of the CTV Building.

"He was not and could not be expected to make full and comprehensive disclosure of the buildings he or engineers associated with him had designed during the course of his career," it found.

"We are satisfied that Dr Reay's omission to disclose his role in the design of the CTV Building could not constitute a representation that he knew to be false or misleading.
Ipenz chief executive Susan Freeman-Greene today confirmed the Institution would not appeal the committee's decision.

"We accept the decision, which follows a very thorough hearing of all the facts of the case," she said.

Ms Freeman-Greene said the institution had published the committee's decision on its website because of the "very high public interest" in the hearing, including the interest of the families of the 115 people killed in the CTV building.

"In cases where a disciplinary committee dismisses a complaint, our normal procedure is not to publish the decision. However, we believe the strong public interest warrants publication in this case," she said.

In March, the Government announced that it is seeking a judicial review into the failure of Ipenz to complete an investigation into Dr Reay.

Building and Housing Minister Nick Smith said the decision to drop the probe was flawed.

"We want the decision overturned and Ipenz to complete the investigation into the professional conduct of Dr Reay's role in the design of the CTV building," he said at the time.

Ipenz has since updated its rules to "put it beyond doubt" that members cannot avoid responsibility by resigning.

The Government last year announced it is looking to strengthen the regulation of engineers to "ensure they have the right knowledge, skills and competence" to design safe buildings and to hold them more accountable for substandard work.