Hi all, Sorry for the slow replies and thanks for the input so far. From what I've read online a re-inforced besser block wall should be about $600 p/sqm including footings in Sydney (Hornsby shire council area). Given the wall is 1m x 10m it should be let's say $7k including design and DA or am I way off? I'd also need to dispose of the current wall + footings but I could probably give the blocks away. The paved area is about 40sqm. Would it be safe to assume $200 p/sqm for concrete base, paver supply (travertine) and install (coping and surrounds)? So the wall and and paving would cost let's say $16k + fencing + cladding. This isn't too bad considering how much better it would look and the value it would add to the house. I like the flexibility the besser would give - render, cladding etc are all options. I'm not sure how bad it is structurally it just has a couple of spots where I can see the blocks have pulled apart over time. Below are some pictures of the bad spots. Also looking at the Amber website it says the maximum courses is maximum non reinforced wall height of 972mm (6 courses). It looks like my wall is actually 7 courses un-reinforced. The wall and pool was built back in 2003. I definitely think planting in front of the wall would help, as would removing the lights but I'm in two minds about whether to bite the bullet and do it properly or just hide it.

Look at 'Iron Ash'. Its a treated version of what you're after. Don't know anything about it but seen it recently on the web. Overall avoid Merbau as mentioned above, as well as being an imported 'sustainably' managed timber.... Use local product's when available as they're manufacturered to high standard's, supporting local job's, companies must meet tight regulation's, etc. unlike other countries....

Got my answer - non combustible material such as, natural stone - marble, granite or concrete etc.

The silver will look quite good with your colour scheme. I would probably change some weatherboard for Scyon Axon just to change it up a bit. Also use Scyon Axent for architraves and wall corners. Don't forget eaves and veranda ceilings, etc. as a really nice looking feature use HardieGroove or maybe even some timber to break up the acres of painted surfaces.