Northern Ireland's Equality Commission has said it aims to publish new formal guidance in June after the Supreme Court's ruling that a woman is defined by biological sex.
The court had been asked to decide on the proper interpretation of the 2010 Equality Act, which applies across Great Britain but not in Northern Ireland.
The Equality Commission said it would "advise all employers and service providers, including councils, to review any policies that the Supreme Court judgment may impact on".
"As always, we advise them to come to us for advice relevant to their particular circumstances prior to making any changes," it added.
The Supreme Court ruling has major implications for single-sex spaces in Great Britain, such as female changing rooms and toilets.
BBC News NI's The Nolan Show asked a number of public bodies in Northern Ireland – including health trusts, government departments and councils – how they planned to react to the Supreme Court's ruling.
The Department of Finance, the Department for Communities and the Department of Health also stated they were considering potential implications.
