A meeting took place between owners of former units in the Sheraton Business Centre in Wadsworth Road, and Ealing Council officials on July 15.
The bottom line of the meeting was that the council plans to bill the owners of units wiped out by the vicious blaze for the costs of dealing with emergency works.
On behalf of business owners, Arun Ahluwalia called this move "incredibly insensitive".
Mr Ahluwalia, of spectacle frame manufacturer Opera Opera, said although his business was one of the 10 which survived, it is a devastating blow to the 23 businesses which were wiped out - some of which were uninsured and will have to deal with costs alone.
Mr Ahluwalia said: "It's basically claiming back what Ealing Council spent on the issue so far.
"Some of the units don't have insurance so they are going to bill them straight.
"I don't know how much they're going to claim from the businesses and buildings destroyed but there are substantial costs involved with all this from what we were told [in the meeting].
"There's a little bit of the council cashing in on people's misery here.
"It's insensitive to people who have lost 30 or 40 years of work.
"They can't quantify anything at the moment.
"I was part of the heated discussion and business owners were very annoyed with the council. It's going to be a nightmare."
A council spokesman said: “We sympathise with businesses and freeholders who have been affected by the fire in Perivale and understand their concerns.
"The council has provided on-going support since the fire began to help people in the area remain safe and to get them back on their feet.
"Council teams were on site during the fire assisting residents, businesses and the emergency services. In addition, the council set up a hotline for affected business, provided guidance on the website and officers have been back on-site and held a special meeting to offer advice and support.
"The council had suspended parking restrictions in the area for a week and those unable to reopen have had their business rates stopped from the date of the fire."
The spokeswoman added: “During the incident the road was temporarily closed and part of the Sheraton Business Centre was demolished in order to make the area safe.
"The council has sought to limit costs, however this emergency work is not budgeted for and the council must recover these costs, which are still being calculated. Owners of the buildings were advised these costs may be claimed on their insurance and further insurance advice has been provided."
A London Fire Brigade spokesman has confirmed the cause of the fire on July 4 is still under investigation.