Can I sell a newly created block without constructing a dwelling on it?

Yes, you can sell a newly created block without constructing a dwelling on it in the ACT, but there are conditions.

Under the ACT planning rules, a block subdivision allows a residential block (RZ1–RZ5) to be subdivided without first building the new dwelling/s. This means you can create a new vacant residential block and sell it. However, the subdivision approval must show that a compliant dwelling could be built on each new block.

If the newly created block remains undeveloped, the new Crown lease will include development covenants requiring the construction of a dwelling within a specified timeframe. In addition, Minister’s consent may be required before transferring (selling) the Crown lease if the dwelling has not been constructed.

Reference:

ACT Government – Advisory Note 19: Block Subdivision versus Unit Title Subdivision in Residential Zones - Block Subdivision vs Unit Title Subdivision (Residential Zones)