Kerry County Council has issued 49 warning letters to property owners in Dingle relating to potential breaches of planning legislation.
Breaches occur when a house is used for short-term letting, without acquiring planning permission to operate as a holiday home from the council.
Applications to change the use of a dwelling from residential to holiday home are assessed individually.
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However, the council says, the significant withdrawal of properties from the long-term rental market will be a material decision on any applications for change of use.