The Constitution (Bunreacht na hÉireann) declares that the dwelling of a citizen in Ireland is inviolable and shall not be entered forcibly except in accordance with the law. This means that no one, including the Gardai (Irish police force), may enter the place where you live without a warrant or other legal authority to enter.
If you are arrested as a result of an unlawful entry into your home, your arrest is illegal. Evidence obtained as a result of an unlawful entry onto your dwelling is inadmissible in court.
Your right to inviolability of dwelling is set down in Article 40.5 of the Constitution.