Rogue-traders have been targeting homes in Mount Merrion, offering to carry out odd jobs around people's houses.
Gardai in Blackrock have been made aware of the unsolicited door-to-door calls where gutter work is proposed at a cost of €500 and this then leads on to roof slates needing to be fixed for €2,000.
Furthermore, four major thefts happened in South Avenue, Greenfield Road and Trees Road in the last number of weeks.
There have also been two car thefts in Mount Merrion where keys were "fished" off hall tables in the middle of the night.
The Mount Merrion Residents Association has advised locals to keep keys hidden in the home as well as leaving the chain lock on front doors.