The cost of an extra bedroom in Australia varies significantly depending on location and property type. Nationally, upgrading from a three-bedroom house to a four-bedroom house adds $175,000—about 21% of the median price—when comparing homes in the same suburb. The difference between the cheapest and most expensive suburbs is substantial.
In Kings Park, Melbourne, the premium for a fourth bedroom is just $60,000, or 9.3% of the median price. A three-bedroom home costs $645,000, while a four-bedroom goes for $705,000. At the other end, Toorak demands a $2.44 million jump for the same upgrade.
Canberra is the most expensive capital city for house upgrades, with buyers paying $236,000 more for a fourth bedroom. Sydney follows at $227,000, while Melbourne’s average premium is $180,000. Regional markets offer some relief, with savings of $20,000 to $60,000 compared to nearby capital cities.
Upgrading from a four-bedroom to a five-bedroom home adds $215,000 nationally, $40,000 more than the three-to-four-bedroom jump. Brisbane leads with a $264,000 premium, just ahead of Sydney at $262,000. Regional South Australia is the most affordable, with a $133,000 increase for a fourth bedroom and $123,000 for a fifth.
Apartment Upgrades: A Different Story
Moving to a larger apartment can be significantly more expensive in percentage terms. Nationally, upgrading from a one-bedroom unit to a two-bedroom unit adds approximately 41% to the purchase price. Moving from two to three bedrooms adds more than 46%, compared with around 21% for a three-to-four-bedroom house upgrade.
In dollar terms, buyers typically pay an additional $315,000 to move from a two-bedroom unit to a three-bedroom unit, almost double the $175,000 premium for an additional bedroom in a house. Sydney has the highest premium for a two-to-three-bedroom unit upgrade at $451,000.
The disparity is particularly pronounced in Sydney’s prestige apartment market. In Millers Point, moving from a one-bedroom unit to a two-bedroom costs an additional $824,000, a 92.9% premium. Upgrading from two to three bedrooms in the same area sees median prices rise from $1.71 million to $4.45 million, a $2.74 million difference, or approximately 160%. Sydney dominates, accounting for all 10 of the most expensive suburbs for one-to-two-bedroom unit upgrades and 9 of the 10 most expensive for two-to-three-bedroom upgrades.
Larger units in premium suburbs often represent a substantial step up in quality, amenities, and lifestyle. Three-bedroom units account for around three in 10 unit sales in the analysis, and in high-end areas, they can signify a significant leap in value.
For units, Liverpool-East in western Sydney offers the cheapest one-to-two-bedroom upgrade at $67,000. Rothwell-Kippa-Ring in Brisbane has the cheapest two-to-three-bedroom upgrade at $44,000, with median prices increasing from $621,000 to $665,000. Brisbane also has a higher share of three-bedroom units, with 38% of apartment sales, compared to 22% in Sydney.
At the prestige end, Bondi-Tamarama-Bronte and Paddington-Moore Park follow Toorak as the most expensive locations for house upgrades, with premiums of $1.38 million and $1.37 million, respectively. The research highlights that in prestige markets, buyers often pay for more than just an extra room; they invest in superior property quality and features.
The analysis of 925 capital-city suburbs reveals that areas with greater variation between their cheapest and most expensive homes tend to command higher premiums for a fourth bedroom. This suggests that in prestige markets, buyers are paying for significant improvements in property quality and features, not just additional space.
