Robertson vs St Marys

The median house price is $1.2M in Robertson and $1.2M in St Marys, so St Marys is the cheaper entry point.

For units, Robertson sits at a median of $645K against $715K in St Marys, which makes Robertson the more affordable unit market and St Marys the pricier one.

On cash flow, Robertson leads: houses there return a gross rental yield of 3.20%, compared with 2.55% in St Marys, a gap of 0.65 percentage points.

Over the past year house prices moved +1.1% in Robertson and +12.8% in St Marys, so recent momentum favours St Marys, although both suburbs recorded growth.

Rental vacancy is 1.4% in St Marys and 3.4% in Robertson, so landlords in St Marys face less competition for tenants. Anything under 2% is generally read as a tight market where tenants compete for homes.

St Marys is the bigger suburb, with a population of 13,256 against 2,017, roughly 7 times the size of Robertson; a larger suburb usually means a deeper pool of buyers and tenants.

In short: Robertson for rental income, St Marys for a lower purchase price, St Marys for recent price momentum, St Marys for the tighter rental market. Which matters more depends on whether the investor is buying for cash flow, capital growth or affordability.