Power station builders who staged an unofficial walkout celebrated victory today after bosses agreed to improve heating, lighting, toilets and canteen facilities.
Eight hundred construction workers downed tools in an unofficial action early last week over substandard conditions.
Unite said it brought work on Runcorn Thermal Power Station to a halt.
The project is still in its infancy and is catering for no more than 300 workers on site.
Talks were held during the week between contractor Keppell Seghers, subcontractors, GMB and Unite, which represents most of the workers.
Higher grade facilities were introduced across the site and compensation was agreed for the workers for having to endure substandard conditions.
But it is believed they may lose part of their monthly bonus.
Unite regional officer Steve Benson said: "The positive outcome would not have been possible if it were not for the tenacity of the site reps and the willingness of the principle and subcontractor management teams to listen and act accordingly."