I am a Australian with a Hongkongese wife. We like Chinese culture and would like to retire in Taiwan. Could an aussie buy a piece of land in taiwan and build my own house? We only have limited budget.

Doesn’t Taiwan operate on reciprocal basis for housing and land purchases? If it is legal if your country of citizenship for Taiwanese to own land or property then i think you can own it in Taiwan. Though I am at a loss at how you would get a residence card to retire in Taiwan.