In 2006, Cate Blanchett bought a Prahran home for $745,000 and added solar panels and a water tank; 18 years later, the Melbourne property sold for more than $3 million

Cate Blanchett is known for playing queens, spies and troubled artists on screen, but her latest headline-making role is a lot simpler: smart homeowner. In early 2024, the Oscar-winning actor and her husband, playwright and director Andrew Upton, have sold their three-bedroom Prahran, Melbourne home for more than $3 million, well above the property's price guide of $2.25 million to $2.45 million, according to listing agency Kay & Burton. The couple purchased the same home for $745,000 in 2006. In between, they added solar panels and a water tank, two features that, according to a 2015 study from the Lawrence Berkeley National Laboratory, tend to raise what buyers pay.

A quiet real estate move that worked

Alwill Architecture transformed this Prahran home into a modern open-plan living and dining space with a loft-style upper level backing directly onto Victoria Gardens. It was due to go under the hammer on March 9, 2024, but was sold privately after generating what real estate agency Kay & Burton described as an overwhelming level of interest from buyers. It may sound like simple market luck that a $745,000 home sold for over $3 million in 18 years, but research suggests two upgrades made along the way might have contributed in part to that price.


Why solar panels are changing the price

The rooftop solar panels on the house are not a small detail. Researchers at the Lawrence Berkeley National Laboratory, in collaboration with Sandia National Laboratories and several universities, published a study called “Selling into the Sun” that examined almost 22,000 home sales in the United States, including almost 4,000 with solar systems, in eight states. Buyers paid more for homes with owned solar panels, on average paying a premium of about $4 per watt of installed capacity, the study found. In an average residential system, that means nearly $15,000 of additional value. With electricity prices rising in Australia, rooftop solar has gone from an afterthought to a selling point.

The water tank was doing more than saving water

The Prahran property's water tank is a detail easy to overlook next to a designer kitchen, but Kay & Burton's own property listing specifically named it among the home's selling features. A peer-reviewed paper published in the Journal of Hydrology, titled 'The capitalized value of rainwater tanks in the property market of Perth, Australia,' found that homes with rainwater tanks are worth up to $18,000 more than comparable homes without one. It's worth noting here that this figure comes from Perth's market specifically, a city with a much drier, more seasonal climate than Melbourne, so the exact premium may not carry over one-to-one, but it's a reasonable indicator that tanks add value beyond their installation cost. The authors of the paper, Zhang, Polyakov, Fogarty and Pannell, note that the premium was above and beyond the actual cost of installing and maintaining a tank, suggesting that buyers value the sense of self-sufficiency that it connotes, not just the saving on the water bill. In other words, both upgrades likely added value well before the sale.

Long-term trends in Melbourne property worked in their favor

Timing was crucial, too. Australian housing prices rose strongly through the 1990s and into the mid-2000s as household debt levels rose, and population growth has been a larger driver since then, research published by the Reserve Bank of Australia explains. Well-located properties are prone to compounding, particularly when held for 18 years and with parkland on the back in a tightly held inner-Melbourne suburb. Nearby, a home at Highbury Grove sold for $3,886,000 in a hot auction about the same time, well above its $3 million to $3.3 million guide, while a cottage in neighboring Windsor fetched $3,025,000, some $275,000 above its reserve.

One trend in Blanchett’s property purchases

It wasn't the couple's first big property call. Blanchett's property journey started with a one-bedroom apartment in Coogee, Sydney in 1996, before she and Upton later upgraded to a two-bedroom apartment in the same suburb. They bought a mansion in Sydney's Hunters Hill in 2004 for $10 million, then renovated and extended it before selling it for $18 million in 2017. That same year, they moved to the United Kingdom and bought a historic English manor for $3 million. They also kept a separate, Sydney-based CBD apartment, which they sold in 2020, leaving them with only an investment apartment on the NSW side of their portfolio. The Melbourne Prahran home was a distinct property they held onto throughout this entire period.

What does it mean for young buyers?

The takeaway is not that buyers need celebrity-level budgets to build wealth through property. It’s that small practical upgrades like solar panels and water tanks can add real value over time, on top of whatever a location naturally appreciates. For first-home buyers, this sale is a reminder that sustainable choices and patience are a good mix.