"factory site" is a correct and usable phrase in written English.
You use it to refer to the location of a factory. For example, "The factory site was considered to be an unsafe working environment."
Beretta is also looking for a new factory site.
The project on the old pencil factory site ultimately fizzled.
The event also gives visitors the chance to explore the Spode factory site in more depth.
In 1998 the former factory site was turned over to the state of Madhya Pradesh.
Britvic's factory site in Norwich is to close, affecting hundreds of jobs.
Downstream, authentic salt marshes are being restored along a blighted factory site now poetically renamed Concrete Plant Park.
But this year they sold their London property and bought a factory site in Bodmin to expand the operation.
Moreover, the factory site is just one section of what is known as the Diamond Alkali Superfund site.
Earlier this year, for instance, a former Grumman factory site was converted into an 80,000-square-foot hangar.
