Think twice about building on a ridge. That is my wise advice to everyone today. If you build on a ridge, expect to build retaining walls if you want flat areas.
I probably walk (ok, drive) passed fifty retaining wall type structures a day and, thanks to our experience, now notice every single one of them. If you need retaining walls, factor in about $150 – $250 a metre for a 1m high wall if you plan to build it yourself. If you are rich and can pay someone, allow about $500-1000. Seriously, I had no idea how much you can blow on these things.
We’ve now built two and I am hoping the second one will back-fill itself because I am buggered. The build coincided with very hot days, high humidity, kids not sleeping properly and a tummy bug.