Petone Engineering was contracted to carry out the seismic strengthening of Qual IT House at 22 The Terrace in Central Wellington.


  • Steel weight – 122 tonnes
  • Estimated Hours – 14,600


22 The Terrace is a ten storey building constructed in the late 80’s.

The project involves the seismic retrofit of the building to 100% NBS.

We were contacted by Catalyst early in the project to comment and consult on the design.

We offered some design modifications and alternative options at a round table meeting with Catalyst and Beca.

After completing a cost and feasibility assessment it was decided some of the options we presented added substantial value in terms of reduced costs and quicker installation, and were adopted into a new design for the building.

This project shows the benefits of early sub-contractor involvement in the design phase of a project.

The building itself consists of a basement, 10 floors and a roof services facility. It is surrounded by adjacent office blocks on 3 sides.

The strengthening is on every floor and mostly internal with a small amount of exterior work on the eastern wall. Positioning the steel components on the required floors was a challenge, and the steel was designed to accommodate the tight access.

Client: Catalyst Consulting
Location: 22 The Terrace, Central Wellington
Consultant: Beca


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Petone Engineering is a leading provider of structural steel and seismic strengthening, having delivered an impressive portfolio of projects across the lower North Island and beyond.