DUBLIN City Council has issued a warning about a sign promoting constituency clinics held by former minister Joe Costello.
The banner was hung from his constituency office at number 75 on Lower Sean Mac Dermott Street, in the north inner city, without, it has been claimed, the necessary planning permission.
The banner advertises clinic times for Mr Costello - who served as a minister of state at the Department of Foreign Affairs and Trade from December 2011 until July 2014.
A complaint was made about the banner to the council, which is investigating the matter.
The planning division of the council has said it may begin to under take "enforcement procedures" following its investigation.
"We have initiated enforcement procedures in accordance with Part VIII of the Planning & Development Acts 2000 - 2013," a letter from the council, seen by the Herald, said.
Under planning laws the hanging of a banner, such as the one on Mr Costello's clinic venue, requires planning permission.
"As required by the Act, we have issued a warning letter to the developer," the council letter said.
"When dealing with enforcement complaints the city council is required by legislation to allow the recipient of the enforcement letter up to four weeks to respond to the complaint made," it added.
The council has said that under planning laws, it will undertake an inspection of the building to establish if any other action is required.
"Additional investigations may also be necessary to obtain sufficient evidence to sustain legal proceedings," the council said.
It said that at the end of its investigation, the complainant would be advised in writing of the outcome and whether further enforcement action is warranted.
The address is used by Mr Costello for constituency clinics from 6.30pm to 8pm on Mondays.
He holds clinics in a number of different venues.
Calls and messages to Mr Costello have gone unreturned over the last number of days.
Despite the council issuing the letter around the middle of October, the sign remained over the building last night.