You can estimate it yourself. Measure the internal area and multiply it by the cost per sqm it will take to build it. For a crap house it would probably cost $600 per sqm. For a medium one probably $1,500 per sqm. High end would be at least $2,000-2,500 per sqm. Then add a bit more for buffer. There you go.
The house I just bought for myself had a replacement value of $450,000 on the valuation report, but I insured it for $600,000 because I know you couldn't build that house for $450,000.