Building firm Mowlem has been ordered to pay £20,000 after admitting breaching safety laws at the Bath Spa.
The Spa should be open by next Easter
The charge was brought by the Health and Safety Executive (HSE) after an investigation caused by the death of a worker on the site.
John Cox, 54, died two weeks after being found semi-conscious on the ground in May 2003 after checking work on a roof.
The company could still face a civil action from Mr Cox's family.
A spokesperson for Mowlem said: "Having pleaded guilty, Mowlem fully accepts the court's sentence.
"We would underline, however, that the HSE has accepted that the breach was in no way either the cause of or a contributory factor in the unfortunate death of John Cox.
"The sentence of the court in imposing a relatively light fine of £8,000 reflects the magistrates' acceptance of the very strong mitigation put forward by Mowlem and the absence of any aggravating features in the case.
"It is also worth reiterating that, during the judicial review of the inquest into Mr Cox's death, held at the High Court in May 2005, Mr Justice Wilson found that the probability was that Mr Cox had fallen on the roof, not fallen from it."
The company was fined £8,000 and ordered to pay £12,000 costs at Bath Magistrates' Court on Monday.
The HSE would not comment on the case.