Privacy is the built-in advantage
A courtyard is already enclosed, so a courtyard pool is private by default. Walls and the house do the screening that planting and fencing have to do in an open yard. That makes a courtyard pool feel like a resort plunge pool from the first swim.
Access is the main challenge
Getting machinery and a shell into an enclosed courtyard is the real constraint. Some courtyards need a crane over the house, a smaller excavator, or a concrete pump-truck. This is the first thing a builder assesses, and it shapes the site costs.
Design for the view from inside
A courtyard pool is usually seen from inside the house as much as from beside it. A dark interior, a water feature, and considered lighting make it a feature you look at year-round, not just swim in over summer.
Fencing still applies
Even an enclosed courtyard pool needs an AS 1926.1 compliant barrier where the pool holds water over 300mm deep with a filtration system. The courtyard walls may form part of the barrier if they meet the requirements - your builder confirms this.