The firm was charged with failing to ensure the plant it supplied was safe for its intended use and found guilty following a trial in the Manukau District Court.
WorkSafe's acting deputy general manager of investigations and specialist services Simon Humphries said, "This is a simple situation – if the plans say bolt it down, there is no excuse for not doing so.
"A worker doing their job has been badly injured because Ebert didn't do the right thing.
"Ebert Construction had an absolute duty, as does every business, to keep workers safe.
"There is no excuse for failing to meet that obligation, and now there's a worker left with life changing injuries."
WorkSafe followed the sentencing with a reminder for construction firms and their contractors to follow through on their safety obligations.