Damp proofing and mould treatment needed in Strokestown home

Looking for a professional to assess and treat damp and mould issues in a residential property in Strokestown, County Roscommon. The problem appears to be in two upstairs bedrooms and an adjacent bathroom. There are visible patches of mould on walls and ceilings, and a persistent damp smell. The property is a two-storey house, approximately 30 years old. I am seeking a qualified provider to inspect, identify the cause, recommend a solution, and carry out the necessary treatment. Please provide details of your experience with similar jobs, any relevant certifications, and an estimated timeframe.