To hebel or double brick?

We are beginning a minor renovation on our 1930's double brick - adding a new kitchen/walk in pantry/sitting/study area, we need the space with a teenager in the house. We are trying to keep the budget down so planning on building a modern version of the older sunrooms which dominated the renovation market many years ago, ie, flat roofed and lots of windows.

Would double hebel be a viable material to use, or is the cost similar to double brick? I believe that if we design to the panel/block sizes that Hebel is made to then we should be able to keep our costs down. Also which is more cost competative, a concrete slab, or more traditional stump and bearer wooden floor?

For windows and doors are there shops like Sydney Woodworkers in Melbourne that sell/manufacture a good product at a non Stegbar price?

I am sure there will be more questions and answers for the start, but all assistance appreciated from the wise ones.

cheers


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