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who we are

AD Consulting Engineers is a small structural engineering consultancy in Sydney that specialises in houses, as well as other low-rise buildings and structures.  Working closely with architects, builders, and home owners, we provide the structural engineering for all-new residences, and for ‘alterations and additions’ renovations.  Plus so much more.

We bring 30 years of experience to the table, having worked with Sydney’s leading architects and builders on over 2,000 quality homes in the eastern suburbs, north shore, inner west and northern beaches areas. 

our people

AD Consulting Engineers is headed up by Andrew Derbidge.  AD spent 10 years working with leading structural engineering design firms in Sydney including Ashby Doble and Van der Meer Consulting, before 19 years as an owner and director of Partridge.  AD Consulting Engineers was founded to continue servicing Sydney’s high-end, architecturally-focussed residential housing sector, but from a smaller, more personalised focal point. 

The AD Consulting Engineers office


Andrew is the ‘AD’ in AD Consulting Engineers, with a 30 year career as a structural design engineer.  Prior to founding ADCE, AD was personally responsible for the design, documentation, and construction supervision of over 2,000 architect-designed, quality homes across Sydney. This included several projects that won Excellence in Engineering awards with the Association of Consulting Structural Engineers (ACSE), and two large houses that won the national Excellence in Concrete award from the Concrete Institute of Australia in 2017 and 2019.  He was the structural engineer for over 50 houses that would go on to win architectural awards from the Australian Institute of Architects and/or building awards from the Master Builders Association.    

As a respected and accomplished structural engineer, AD has served on the Board of the Association of Consulting Structural Engineers; served on the judging panel for the awards program of The Concrete Institute of Australia; and is a guest lecturer in both the Engineering and Architecture faculties at both Sydney University and the University of NSW. 

AD is also the creator and chief contributor to the engineering blog, The Working Engineer and has also written feature articles for the national publications of Engineers Australia and the Concrete Institute of Australia, respectively.

mission, vision and values

The above three terms are often just corporate buzzwords. For us, it’s actually pretty simple: We strive to bring the architect’s vision to fulfilment; to make the builder’s task easier on site; and to deliver quality and value to the client. We achieve these objectives by sticking to these fundamentals…


We carry out detailed and specific analyses so that the structure is tailored, fine-tuned, and fit-for-purpose. We don’t just read off span tables or specify over-engineered solutions that add unnecessary cost.


We co-ordinate closely with the architect so that the structural design is sympathetic to the architecture and allows the architect’s design and objectives to flourish.


We produce highly-resolved and detailed drawings that depict and specify the details, connections, and configuration of the structural elements. This means the builder (i) doesn’t need to build fat into their tender to price what they can’t see, (ii) doesn’t need to guess on site and risk mistakes or costly delays, and (iii) doesn’t need to raise variations for extras because the details and solutions weren’t worked out and documented in advance.


We’re a small, boutique operation, founded on the principles of customer service, attention to detail, and long-term relationships. You’ll receive personalised and dedicated service from an engineer with three decades in the game.

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