Damp proofing and mould treatment needed in Ballaghaderreen home

Looking for a professional to assess and treat damp and mould issues in a residential property in Ballaghaderreen, County Roscommon. The problem appears to be in two upstairs bedrooms and along an exterior wall in the living area. There's visible mould growth and a persistent damp smell. The property is a detached house, approximately 30 years old. I'm seeking someone with experience in identifying the source (whether rising damp, condensation, or penetrating damp) and providing a lasting solution. Please quote for inspection and treatment. Photos of the affected areas can be provided.