Engineer Required?

Hi all
We're about to embark on our second renovation, and we're aiming to do everything "by the book" with appropriate paperwork, certifications etc, as we may want to sell the house again in a few years. It will be as an owner builder. I'm ok with the "doing" side of things but I think I'm facing weeks worth of reading to learn the paperwork side of things

I am uncertain about who will need to sign off on what aspects of the design and construction. I have a copy of AS1684, and access to the BCA and was thinking about putting together plans and working drawings myself. I understand I need the council or a private certifier to issue a construction certificate approving what i design? would these working drawings need to include all internal details such as bathroom drainage and waterproofing etc, new doors in non-load bearing walls etc?

The plan requires removing several walls and making a very small addition to give one room a bit more width. I've attached a drawing (from the realeste listing) showing in red the addition I'm talking about. It's a timber framed hosue sitting on brick piers and single skin brick wall foundations. the roof is a skillion with rafters running in the shorter direction and we'd like to remove all internal walls running parallel with them and rebuild the roof the suit. We'd also like to add a 3.6m opening in approximately the middle of the rear wall for a set of bifolds. It seems easy enough to follow the standard regarding section sizes and bracing (I am finishing off an engineering degree at present but mechanical not structural).

My main question is: will I need an engineer to approve the drawings in addition to the certifier (assuming I manage to work within the standard)?

My other question is: is it legal for me to do the structural building work myself? I'm sure the certifier will check it over but will I need to have paperwork to prove a carpenter did it, as I assume is the case with electrical/plumbing?

And finally, will I need geotech done to add 2 pad footings for the small area i indicated in red?

Thanks for any insight you might have - just trying to get my head around what needs to happen to be all 100% legal

Many thanks
Paul
Attached Thumbnails http://www.renovateforum.com/attachm...ed-drawing.jpg



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