Altrincham-based RNT Developments and Construction Ltd brought in roofers, damp treatment experts, electricians, joiners and plasters to work on the nineteenth century Harris Institute.

But safety inspectors were shocked when the firm failed to provide basic facilities for workers.

Preston Magistrates’ Court heard that refurbishment work had started on the Avenham Lane building on January3  2013, but HSE were not alerted to the absence of amenities until an inspector visited the site on 19 February.

During this time, a dry rot treatment subcontractor had filled six skips with plaster from the walls, with other contractors removing rotten timbers and floor boards in dusty conditions.

Workers had to use wet wipes and paper towels to clean themselves, and leave the site to find toilets elsewhere in the city.

Magistrates were told that the three-storey building had been empty for two years before the work started and the water supply had been turned off, which meant the existing toilets could not be used. The temperature inside the building was also bitterly cold.

RNT Developments and Construction Ltd, of Broadheath, was fined £5,000 and ordered to pay prosecution costs of £1,000 after pleading guilty safety breaches.

Speaking after the hearing, HSE Inspector Stuart Kitchingman said: “It would have been easy for RNT to reinstate the existing welfare facilities in the building, but instead the firm allowed work to be carried out in grimy and dusty conditions for nearly seven weeks without access to the most basic facilities.

“It’s totally unacceptable in the twenty-first century to find Dickensian-like conditions. In fact, it’s a legal requirement that workers aren’t treated in this way.

“The working conditions were archaic – more like they would have been when the building was first erected in Victorian times – and will no longer be tolerated in the 21st Century.

“RNT should have made sure there were welfare facilities on the site before it allowed the refurbishment project to start. Instead, workers had to face needlessly unpleasant conditions over several weeks.”