3D Modelling and CAD Design

Tonkin + Taylor’s Computer Aided Design (CAD) team continues to expand to meet client needs and expectations. We offer specialist design services for infrastructure, land development and solid waste sectors.

Our strong track record in these areas includes significant contributions to many high-profile projects.

These include the SH20/20A Extension to Mangere Airport and Northern Gateway (Albany - Puhoi motorway extension) roading projects in and north of Auckland, along with Auckland’s Vector Tunnel and Canterbury’s Kate Valley and Redvale Landfills.

Our CAD team offers a high level of technical expertise and a strong team culture. This ensures we provide efficient and productive services, using up-to-date industry standard software

12d Model


Our design team has been using 12d Model software for more than 15 years. It’s the main design software used for road, rail and tunnel alignment projects and for land development projects such as subdivisions, quarries and landfills.

12d Model software is ideally suited to alignment design and offers:

  • Powerful string-based terrain modelling
  • Fast design for a variety of projects
  • Smooth data exchange with software such as MX Road, AutoCAD and AutoCAD Civil3D.

We used 12d Model software to design the 7.5km-long Northern Gateway motorway extension to the Northern Motorway in Auckland, the Waterview Connection tunnels and numerous landfills throughout New Zealand.

AutoCAD Civil 3D (C3D)

AutoCAD C3D software is used primarily for earthworks projects such as landfills, quarries and subdivisions. We’ve used this software for more than eight years, with C3D replacing our previously used AutoCAD LDD software.

C3D is able to open older LDD files and offers:

  • Full AutoCAD integration
  • Earthworks modelling and volume calculations
  • Surveying, design, analysis and documentation features
  • Data exchange with 12d Model, allowing use of both programmes on a single project
  • Production of high-quality rendered images for presentations and photo montages.

We’ve used C3D to design the Redvale Landfill (which had a volume of 20 Mm3), Silverstream Landfill (5 Mm3) and the Kate Valley Landfill (volume of 11 Mm3).

Download Capability PDF

CAPABILITY PDF