I would check with an accountant...selling a plot v selling a house...selling your own house that you live in does not attract capital gains...what happens if you sell the plot separately ?
Even if you have the ready cash to finance the build and don’t need ti borrow, that could also give you the highest possible headache/aggro/sleepless night/stress. Selling a piece of land that you already own is relatively easy. Depends on whether you want the stress.I also think the best would be to build it yourself to get the highest profit possible from this piece of land. Selling land as it is without any real estate on it is not that profitable.
Just a daft way of saying your opinion might be different.