I typically get asked to quote to design residential projects consisting of small granny flats up to 2-3 storey houses. These foundations are typically designed in accordance with the Australian Standard AS2870 Residential Slabs and Footings. As I am a structural engineer I understand from the code that the classification of the site should be undertaken by someone who has geotechnical experience. So I usually request a geotechnical report even for the granny flats and single storey extensions as I would not back my knowledge of geotechnical matters. I have found though that when I have got geotechnical engineers to quote the quotes range from $600 to $2,000 for a granny flat. This usually results in the client going with someone cheaper, who for some reason doesn't require a geotech report. Has anyone else come across this and how do you get the information you require to get a classification for a site. I am based in Sydney.
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