Welcome to Diagnostech

Diagnostech provide building consultancy and structural engineering services primarily to the remedial building sector with an emphasis on concrete repair and rehabilitation, waterproofing, facade refurbishment, and structural repairs. We cater to many aspects of the property sector including commercial, residential, strata, industrial, infrastructure and institutional buildings.

We have forged an excellent reputation as experts in the field of building defects diagnosis and the design and project management of high quality remedial building projects.

Our team consists of experienced Building Consultants and Engineers, bringing together a wealth of construction and design knowledge required to provide successful remedial design solutions to what are normally complex and often misunderstood building defects. We also provide a number of property consultancy services including building condition audits, asset surveys, dilapidation surveys, sinking fund forecasts, technical due diligence reports and capital expenditure reports.

Our services and expertise also extend to the provision of expert witness services and building and waterproofing consultancy in respect to the ever growing area of Home Warranty Insurance claims and Building Disputes resolution.

Diagnostech Pty Ltd was established in 2002 by Dennis Stephenson in response to growing demand for independent professional advice in relation to the diagnosis and rectification of building related problems and defects.

Diagnostech is based in Sydney and caters to projects with no geographical boundaries having worked throughout Australia, New Zealand, and Asia.

Our services fall broadly into two certainly interrelated categories:


We offer specialised consultancy services focused primarily on the remedial building sector.

We diagnose building problems, design and document appropriate solutions, and project manage remedial and refurbishment building projects for a wide range of clientele and property types including:

  • Commercial
  • Industrial
  • Infrastructure
  • Strata


We provide a range of building surveying, technical consultancy and reporting services to the property sector.

With the benefit of a wealth of remedial building experience and hands on knowledge of construction methodologies, design, materials and costs we are well placed to offer building surveying and technical reporting services to Property Investors and Owners.

Services include:

  • Technical due diligence reporting
  • Condition and building defects audits
  • Dilapidation surveys and make good assessments
  • Maintenance forecasts