T Richard Jones (Betws) Ltd was operating a site at St Michael's Church, Manselton, Swansea on 10 August 2011 when Health & Safety Executive (HSE) inspectors made a routine inspection.
Swansea Magistrates' Court heard that on arrival, HSE's inspectors were informed that the site manager was on holiday and so not available to see them.
Washing facilities were found to be inadequate and workers were using lime mortar without wearing protective glasses or gloves.
In addition, there were two employees working at height without measures in place to prevent injury caused by a fall.
T Richard Jones (Betws) Ltd of Foundry Road, Ammanford, pleaded guilty to breaching Section 2 (1) of the Health and Safety at Work etc Act 1974. The company was fined £2,000 and ordered to pay costs of £3,658.
HSE inspector Phil Nicolle said: "This company put the safety of its own workforce at risk by failing to ensure the site was managed by a competent person, and the catalogue of failings suggested a lack of regard for workers' health, safety or welfare.
"Construction companies have a duty to ensure that their sites are operated in a safe way. Putting these matters right was neither expensive nor technically difficult.”