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About Us

Warkworth is a beautiful place to live with the bush clad Mahurangi River winding past the township, the bridge and the Old Bridge House Pub. The rolling countryside with open green fields, vineyards, bush and views of the sea and Kawau Island, with a moderate climate, good fishing, a local airfield, friendly people and a low crime rate. Warkworth is a great place to live and the area is developing and in need of Professional Engineering services.


Who We Are
John McLaren  BE (Civil), CPEng (Civil), Int. PE

John McLaren BE (Civil), CPEng (Civil), Int. PE


John McLaren joined the company in 2006 and has over 25 years' experience as a Civil Engineer. He manages our roading projects, traffic engineering studies, flood control projects and public infrastructure projects.

John Papesch  BE (Civil), NZCE, GIPENZ

John Papesch BE (Civil), NZCE, GIPENZ


John Papesch has worked in the Bay of Islands since 2003 and has 15 years' experience as a Civil Engineer. He manages our marine engineering, wastewater and stormwater work. Email:

Phil Workman   BSc, BE (Civil), MIPENZ

Phil Workman BSc, BE (Civil), MIPENZ


Phil has been in Kerikeri since 2003 and has over 30 years' experience as a Structural Engineer. He manages all our structural design and construction supervision work for residential, commercial and industrial buildings, including geotechnical assessment and foundation design.


Colin Ashby MIPENZ, CPEng, Int PE, B.E., NZCE

Colin Ashby MIPENZ, CPEng, Int PE, B.E., NZCE

Consultant - Based in Christchurch

Colin has some 40 years of engineering experience. Starting work as an Engineering Officer Cadet with the Ministry of Works working in Auckland and Whangarei and gaining NZCE, then a BE at Auckland University.

During his 10 years with Works he gained a sound broad experience including Survey, Roading Design, School site development, Bridge Construction, Laboratory work and Structural design.

Colin spent 13 years during his career with local government holding the principal engineering position with 4 different authorities including the former Onehunga Borough and Kaipara District. Again gaining a broad experience inclusive of Town Planning, Water, Stormwater and sewer reticulation, roading etc but also gaining an appreciation and understanding of how Councils function, which has been of assistance in providing service to clients.

Colin also worked for Holmes Consulting Group as a site engineer on high rise buildings and as development engineer on an industrial complex. Colin also worked for TSE group in a structural and development engineering role, before setting up his own practice at Warkworth.

Colin’s interests are; Flying (has own microlite, great for aerial photos!) and Vintage Cars. Colin is happily married and has 3 adult children.

Since the 2010 Christchurch earthquakes Colin has been spending more and more time on the South Island helping with the Christchurch rebuilding effort. Recently Colin and his wife have moved to Christchurch and they split their time between Christchurch and Warkworth allowing Colin to offer his engineering services in both locations.

David Manning TIPENZ, ETPact, Int ET(NZ)

David Manning TIPENZ, ETPact, Int ET(NZ)


David gained his Bachelor of Engineering from Auckland University in 1992 before spending 4 years of his OE in Europe. Returning to New Zealand David commenced work at Ashby Consulting in 1997.

Most of Davids time has been spent in the field of Structural design, where he was found to have a natural apptitude. Earlier experience included Geotechnical investigations, catchment flooding analysis, surveying and some roading design. David claims he didnt have any grey hairs before signing on, but 10 years of matching client's dreams to local law has given David that "distinguised" look a few grey hairs can bring.

A typical day in the life for David at Ashbys can include the design of reinforced masonry, reinforced concrete, steel and timber structures or combinations of all three. He may also be found in the field carrying out site inspections specifically requested by the local district councils. These site inspections are for certain elements of a project during construction to ensure compliance with the design or the design is appropriately amended to suit site conditions.

David is also very competent in preparing fire design reports, safe and sanitary reports, pre-purchase house inspections, unauthorised works reports, and site wind speed assessments. (site wind speed assessments are generally required when you are planning to build in a place where site topography, etc falls outside the scope of NZS3604).

Tom Wilson BEng(civil)

Tom Wilson BEng(civil)

Civil Engineer

Thomas gained his engineering degree from the University of Canterbury.

Following his graduation, Thomas followed his dream to help in developing communities and went to work with EMI in East Africa. While over there he worked to design various schools and facilities to aid needy communities.

He has now made the move to the sunny Northland to work with the team here at Ashbys.

Louise Elms

Louise Elms

Office Manager

Louise has found her niche as Office Manager for a great group of people at Ashby Consulting. It is here that you will encounter her as first point of contact.

She not only enjoys her job but also keeps busy with family, kick-boxing and general fitness.

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