Kerry County Council has failed in a legal bid to force Michael Healy Rae to remove a 10 metre squared sign advertising the Independent Kerry TD's work and contact details on the gable end of his house in Kilgarvan.
The order was sought at the Circuit Civil Court in Killarney, but the judge said the council had applied too late.
Mr Healy Rae erected the sign after he was elected to the Dáil in 2011.
More than eight and a half years later, Kerry County Council sent him two warning letters to remove the unauthorised sign.
He refused and met the council in court today where an order was sought for the removal of the sign.
The council argued the sign was a distraction, likely to confuse drivers.
Mr Healy Rae's legal team argued that the sign was in place for more than seven years and the council was out of time to make its application.
Judge Terence O'Sullivan agreed and the TD won his case.
Speaking afterwards, he said: "Common sense prevailed. I was in the right."
He said the sign would remain in place, as long as the people of Kerry continued to elect him.
Judge O'Sullivan granted Mr Healy Rae two thirds of his costs, while he adjourned a similar set of proceedings against his brother, Deputy Danny Healy Rae, until later in the year.