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Jansen Design
6/55 Avalon Parade, AVALON, New South Wales, 2107 
02 9918 5505
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Jansen Design is a boutique architectural practice located at Avalon specialising in the design and delivery of creative, practical and affordable projects.  We have over 40 years experience, and offer creativity, quality, excellence and value.

As registered architects, we initiate and manage a process in which we take responsibility for a project from client briefing through design and regulatory approvals, and construction, to post completion.  We use our design and method skills and training to arrive at functional, sustainable, aesthetically pleasing and economic solutions which meet client and community expectations. 

We are serious about sustainability and embed it as a core element into the fabric of our work, it is unseen, seamless and supportive.

Our principal architect Emile Jansen has worked in some of the largest commercial architectural practices in Sydney, Brisbane and China, where his body of work includes private homes; high rise apartments; town houses; aged care facilities; office blocks; industrial buildings; retail premises; hospitality and hotels; an airport, two grandstands, an Olympic pool, a church and community libraries.

Our expertise includes:

  • concept design and design development,
  • approvals documentation and submission,
  • construction documentation,
  • consultant co-ordination and tender negotiation,
  • contract administration.
  • expert witness & forensic analysis & remedial work

We provide our clients with a Feasibility Study, which includes a series of meetings and design workshops to establish a base plan and a probable project cost.  This is an affordable process which enables our clients to engage the expertise of an architect early, to provide the information they require before progressing their project through to completion.  


To craft space, to create relaxing, practical and relevant places

to work and live in.


It is the success of the human experience using these spaces,

where the true value of good architecture is felt.


Jansen Diagnostics  is a Sydney northern beaches based company with a strong reputation and the skills you may require to solve your building problems and issues. We are available to give advice to strata and commercial property owners anywhere in Australia and to assist legal teams writing expert reports for use in litigation.

We provide a range of services for strata title property owners, and specialise in design and implementation of effective solutions for all building works, from building repairs and renovations, diagnostics to complete building and services upgrades. Projects range from multi storey residential to broad acre industrial and most things in between.

Expert report and expert witness


  • forensic investigation of structural and fabric failures

  • arranging sampling and testing

  • examination of and professional  opinion on services provided by professionals and consultant

  • writing expert reports for use in litigation

  • assisting legal teams in crystalising relevant issues and shaping the claim/defence

  • giving expert witness testimony


We have over 40 years of professional experience in a very broad range of project types from multi storey residential to broad acre industrial  


  • NSW registered architect  No: 3109 since 

  • ex-Fellow, Royal  Australian Institute of Architects

  • ex-Fellow, National Institute of Forensic Investigators

  • ex-graded Arbitrator, Institute of Arbitrators Australia

To find out more about our Expert Report and Expert Witness Services, please contact us on 02 9918 5505 or go to!diagnostics-/cgkn


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