The staff redundancies are being made after the company revealed last month its profits would be around half the level of which was reported a year ago due to "further deterioration" in its UK construction and support services businesses.
In addition, problems are continuing with contracts in its exited energy from waste business. An additional £35m provision has been made to cover costs, on top of £160m already provided in 2016.
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Unite has now called on the company to meet with the union to discuss its future.
Unite national officer for construction, Bernard McAulay, said: "It is vitally important that Interserve sits down with Unite and explains fully what is going on at the company and what the plans are for the future.
"There are many Unite members currently employed with Interserve in construction roles who are becoming increasingly concerned about the uncertainty which is currently surrounding the company.
"It is not acceptable for Interserve to hold Unite at arms-length and to deny us a seat at the table when workers' jobs are under threat.
"Workers need reassurance that there are not going to be further job losses in the short to medium term."
(LM)
