Brentford have started work on the Lionel Road site and are still hoping to be in the new stadium by the start of the 2019/20 season.
It has been a long road to reach this moment, with planning permission being granted in December 2013 by Hounslow Council.
The Bees also had to secure a compulsory purchase order on pockets of land around the site, which was approved on April 1 last year.
And the Bees have finally started actual preparation work on the site in order to start building their new home.
Chief executive Mark Devlin told GetWestLondon: “We're still hoping to be in the stadium for 2019/20. The hoardings have begun to go up on the site.
“Some minor clearance work has already started. There's due to be more work carried out shortly.”
London Irish have been granted permission to use the Lionel Road site, once it is built.
"The council's decision is very encouraging news for London Irish," Irish chief executive Bob Casey said.
"The ability for a professional rugby club to also play at the new Brentford Community Stadium has always been a desire of the football club," Casey said.
"London Irish share common values and a community ethos with Brentford FC, which augers well for a future commercial relationship."
Brentford have been at their Griffin Park home since 1904 and the site of the current ground will be used for housing.
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