The firm has offices in London and Milton Keynes and works on projects across the UK.
Administrator Tom Keenan of Keenan CF confirmed that staff were being made redundant.
Local reports put the lay-offs at around 200 of the total 320 staff.
The administrator told the BBC: “Following the company’s recent trading difficulties, a number of the company’s contracts were terminated by customers and the reduced level of activity in the business has directly impacted the level of staff required.
“The administrator will continue to review employment in the context of workload and the financial condition of the company and will keep employees informed.”
One worker told the BBC that workers were being told in groups of 25 that they were being made redundant