The United Kingdom's revised code of practice for single-sex public facilities has taken effect, establishing that services including bathrooms, dressing areas, hospital wards, and domestic violence refuges must operate on the basis of biological sex rather than personal gender identity. The guidance, arising from a Supreme Court ruling in spring 2025 and covering England, Scotland, and Wales, provides legal reference material for businesses and organisations offering such services and carries weight in potential court challenges.

The policy's implementation involves substantial practical demands, with analysts projecting that approximately 13,000 bathroom facilities and over 5,000 dressing rooms will require renovation across healthcare, leisure, and hospitality venues. Public-sector costs are estimated at roughly £20 million upfront plus £14 million yearly, though the government maintains many organisations may already comply with no additional expense. The code simultaneously acknowledges that self-contained, individually controlled facilities accessible to all could address access concerns for those affected by the new requirements.