A group of men were arrested in Southall on Tuesday (December 13) after being found to have overstayed their visas or entered the country illegally.
Immigration enforcement officers found the men during an operation targeting illegal workers in the construction industry.
Officers were acting on intelligence about suspected illegal workers in the King Street area, the Home Office said.
Fifteen Indian men aged between 26 and 63, were arrested, and were quizzed on their right to live and work in the UK.
The Home Office said six of the men were found to have overstayed their visas, while nine had entered the country illegally.
A 63-year-old man who was later temporarily released on health grounds must now report regularly to Immigration Enforcement while his case is progressed.
The remaining 14 were transferred to immigration detention pending their removal from the UK.
Two of the 15 offenders were found in a van owned by S Kumar Construction, in Whitestile Road, Brentford, Home Office said.
The company's owner was encountered at the scene and was served a notice warning.
Assistant director Chris Edwards, head of the West London Immigration Enforcement team, said: " This was a carefully planned and well executed operation resulting in a significant number of immigration offenders being caught.
"We are working hard to tackle illegal working and those who abuse the UK’s immigration system.
"Using illegal labour is not a victimless crime; it cheats the taxpayer, undercuts honest employers and means legitimate job seekers are denied employment opportunities.
"It also exploits some of society’s most vulnerable people".
People with information about suspected immigration abuse can contact www.gov.uk/report-immigration-crime or call Crimestoppers on 0800 555 111.
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