Chris Hemsworth has given fans their first glimpse inside his mega-mansion as the A$20 million property nears completion.

The Thor star shared an Instagram post of a mural he commissioned to fill a "big empty wall" inside the property.

Photos show the home, which cost an estimated A$8.8 million to build, boasts a minimalist theme with matching grey concrete covering the floor, walls and high ceilings.

In his Instagram post the actor explains artist Otis Hope Carey created the mural to symbolise "ceremonial dancing of the Gumbaynggirr people" and the ocean.

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"In this piece, Otis utilises traditional symbols and imagery in grandiose scale in a display of contemporary practice and thought," Hemsworth wrote.

Hemsworth and Pataky paid A$7 million for the original property in 2014 but decided to tear down the existing eight-bedroom Balinese-style mansion.

A development application for the build was lodged with Byron Shire Council in late 2016 and approved in March 2017.

Construction began on their new property in 2017 and, when complete, will include six bedrooms, a steam room, media room, gym, games room and a 50-metre rooftop infinity pool.

The mega-mansion is located in Broken Head, 12km from Byron Bay.
The mega-mansion is located in Broken Head, 12km from Byron Bay.

Their property is located on 4.2ha in Broken Head, 12km from Byron Bay.

Hemsworth and Pataky married in 2010 after a whirlwind romance and decided to move from Los Angeles to Byron Bay with their three children in 2014 in a bid for a quieter life.

Irate locals labelled the multistorey property "obscene, greedy, flashy and vulgar" when work on it first began.