Andrew Wilton - Director


Areas of Expertise:

  • Design of industrial and marine structures
  • Computational modelling and finite element design
  • Damage avoidance technologies for seismic



Andrew came on board as a Director of CGW in early 2017 and looks after the company’s expansion into the southern part of NZ. Based in Wanaka, he has extensive knowledge of the residential construction industry in NZ due to starting Wilton Joubert Ltd in 2001 and growing that business to an involvement with around 10% of NZ’s residential building consents annually. Andrew saw the benefits that a CGW/WJL relationship could have and was actively involved in the WJL purchase of 25% of CGW.

In his CGW role, Andrew is the point of contact for any Southern Lakes consulting work. He leads the rapidly growing Wanaka office (if you’ve ever been there you’ll understand why the area is growing rapidly…). His management style is trusting people to “deliver what they said they’d deliver when they said they’d deliver it” and ensuring that happens.

Andrew is a typical outdoors Kiwi, with a particular love of skiing, general aviation, and a good red wine occasionally. OK, he’s a petrol head as well, but you won’t catch him talking about it unless he’s with like-minded people. Having started a family later in life, Andrew is now fully engaged with his wife Fiona in the development of a couple of fine young men.


You will find Andy in our Wanaka Office  

Phone: 03 443 6209

Mobile: 021 494 586


Tim Sikma - Geotechnical Engineer


BSc(Hons), BCom 

Tim joined CGW in 2017 and operates from our Wanaka branch. Tim provides his local experience to our geotechnical, hydrogeological and wastewater projects in the Central Otago and Queenstown Lakes District area.

Tim's experience includes hard and soft rock slope stability investigations, geotechnical risk management, foundation studies, mining and exploration, contaminated sites, water resource investigations, and irrigation design and efficiency. Has a science degree majoring in geotechnical engineering and environmental science, a commerce degree in business management, is a NZ certified drainlayer, and is a member of Engineering New Zealand.

Tim loves the outdoors and enjoys going tramping, mountain biking, kayaking, and pack rafting. Tim competes at national and world championship events for adventure racing and long distance navigation.


You will find Tim in our Wanaka Office  

Mobile: 020 402 81861



Mitchell Kemp - Structural Engineer


Areas of Expertise:

  • Structural engineering

  • Seismic assessment

  • Building investigation


BE(Civil)Hons, GIPENZ, MEngSt(EQ)

Since 2017, Mitchell has worked as a Structural Engineer in our Wanaka Office. Before making the move South, Mitchell was based in our Christchurch office.

Mitchell’s experience is in the structural design of new buildings, the seismic assessment of existing buildings, and the design of seismic strengthening schemes for existing buildings.

In his spare time Mitchell loves to make the most of what the Queenstown Lakes District has to offer, with a particular passion for mountain biking, skiing, and hiking.


You will find Mitchell in our Wanaka Office 

Phone: 027 631 7871



Nathan Borger - Civil Engineer


Areas of Expertise:

  • Civil Design & Modelling

  • Civil & Structural Drafting

  • Low Impact Stormwater Design

  • Site Investigation & Surveying


BEng Tech, MEngNZ

Nathan joined CGW in 2011 and has worked in the Nelson and Christchurch offices and is now currently located in our Wanaka office.

Nathan’s expertise includes civil design, modelling and drafting, stormwater and treatment design, structural drafting, and construction monitoring. He has worked on a broad variety of jobs from large to small and brings a wealth of experience to the team.

He has a great eye for detail, and is passionate about designing cost effective, practical solutions.

In his spare time Nathan enjoys BBQ’ing, music and playing sport.


You will find Nathan in our Wanaka Office 

Phone: 027 456 7833