The firm is a major player in the offsite market having won places on a raft of public modular frameworks servicing contracts from its manufacturing facility in Newark.
Staff are now looking for new jobs after at least 20 workers were made redundant when administrators from Alvarez & Marsal took control this week.
Former staff across a range of professions have taken to LinkedIn to change their status to “open to work”.
Caledonian’s website is currently down and calls to the head office are going straight to voicemail.
Latest accounts filed at Companies House for the year to March 21 2020 show the firm made a pre-tax loss of £2.8m from turnover of £45.3m and employed 222 staff.