I am doing my deck as well, it has the similar size 30m2 and L-shape as your. The long side is 9x2.4, and the short side is 4x1.8.
The space between the deck and the ground from 220mm to 450mm.
I am not good at the Google Sketchup, manager to get the concept design.
I am using 2x140x45 as bear span at 1.75, and 140x45 as joist span at 2.4m and space 450mm centre fixed into the face of the bear using joist hanger. Decking board is 90x19 Merbau

Footings: 300mm diameter x 500mm deep
Stirrups: Pryda full stirrup anchors 100mm-600mm leg
Bearers: 2x 140x45 Laminated MGP10 H3 treated pine, span at 1700mm, and sit direct on the Stirrups
Joists: 140x45 MGP10 H3 treated pine, span at 2400 mm, spacing 450mm centre fixed into the face of the bear using joist hanger
Decking: 90 x 19 Merbau - to be screwed down with the SS.

Currently pricing as following
Bearers: approx. 40LM x 6.85 = $270
Joists: approx. 71LM x 6.85 = $490
Decking: approx. 350LM x 3.95 = $1400
Stirrups: $150
Concrete: $200(40 bag 20kg for 15 hole)
joist hanger: 30 x$2 = 60
Mounting hardware for stirrups/joist hanger: $200
Decking screws: $200 from ebay (including 1500 10-12G 304 SS and smart bit)
Tool hire (two man post hole digger): $80
Total: $3100
Someone suggest it is roughly $100/m2 for the material only, but I know the cost will go up at the end of the day.
The price of 90x19mm Merbau should be less than $4 lm, at least at big B in Sydney.
The site just be cleaned last weekend, and this weekend may start sourcing the timber and decking, and prepare the digging. Expect to be finished by the end of the year.
Following the link below, you will need 4.5 bags 20kg concrete mix for the 300x600 footing.
http://www.bluecirclesoutherncement....ncretePremixed
Good luck for you progress, I will keep watches your post.

Attached Files deck_plan_140_2.pdf (24.5 KB)


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