The four protesters blocked the front entrance of the building for about an hour, as the hooded individuals held scythes in one hand and a banner in the other proclaiming Woodside Petroleum and Chevron were "climate criminals".
"Our state government is acting like climate deniers enabling these climate criminals to do their stuff, we should be reducing emissions, not increasing them, there's no plan for renewables, there's only a plan to pollute," protestor Mark Baker said.
An email notice sent to QV1 employees said all visitors would be verified at the building's entry points by security as a result of the protest.
The activists were issued move on notices by police.
The protest follows a two-week climate vigil held by the group at a park across the road from parliament house, coinciding with the parliamentary sitting week.
The group have also protested Woodside and Chevron's sponsorships of Fringe and the Perth International Arts Festival, respectively.
The oilers have been subject to protests since last year, though events have typically been smaller than similar climate and anti-fossil fuel events on the east coast.
"It's about giving Chevron and Woodside their weekly reminder that we're watching," Extinction Rebellion spokesman Jesse Noakes told Energy News.
"Turning up outside QV1 is about making a visible and physical reminder…I've heard the reapers are playing on the minds of the workforce."
However, he emphasised the group respected workers and their rights and said the group's presence was an attempt to start a conversation.
He said the group intends to hold another vigil outside parliament during the next sitting fortnight, when Woodside's North West Gas Development Agreement Amendment bill is expected to be passed.
The Burrup Hub development is expected release around 6 billion tonnes of CO2 emission over its lifetime, according to a report from Clean State, an anti-gas group allied with the Conservation Council of Western Australia.
"I can assure both politicians in the chamber and the executives in the boardroom that we're going to be there," he said.
A Woodside spokesperson said the company respects their right to protest and LNG production does contribute to Australia's emissions but it was not the whole picture.
"Natural gas helps reduce global emissions: it is clean, reliable and the ideal partner for renewables," she said.