In a 1,000 sq.m maintenance workshop at a company building road pavements and sports surfacing, a spark ignited a tank containing dissolvent during cutting operation (hot work). Fire spread to the rest of the premises, which housed the parts and minor tooling, paints and solvents, batteries and electrical spare parts. The building was partially destroyed: 15% of the sheet metal roof, maintenance parts and a small tooling room, the solvents/paints room, and the room designated for batteries and small electrical equipment. An employee seriously burned over 18% of his body required hospitalisation. Runoff water (fire extinction and rainwater) was collected in the retention capacities. This incident was caused for several reasons: the cutting station was placed too close to the stock of solvents and paints, an operation performed in the wrong direction, and a dissolvent tank not located in the designated room. The Classified Facilities Inspectorate recorded these findings. A local authority notification order was proposed subsequent to non-compliance with several articles listed in the site authorisation order. The cutting area was moved. The maintenance workshop’s execution and storage zones were rebuilt. The operator deployed additional training modules: more intensive awareness-building campaign among personnel in the use of extinguishers and the code of conduct in case of an accident and fire, use of collective protection resources, and application and storage of hazardous products.