This article addresses the issue of accessibility of buildings for people with disabilities and those with special needs in the light of the provisions of the Construction Law. The starting point for the discussion is the premise that accessibility constitutes one of the fundamental human rights, underpinned by provisions of the Polish Constitution as well as international and EU law. The study discusses the key legal acts governing this issue, including the Act on Ensuring Accessibility for People with Special Needs, technical and building regulations, and standards arising from the UN Convention on the Rights of Persons with Disabilities and European Union policies. The article analyses key concepts such as accessibility, architectural accessibility and universal design, highlighting their significance for shaping the built environment. The analysis showed that despite relatively extensive legal regulations, there are significant difficulties in their effective enforcement in practice. The most significant barriers include institutional constraints, organisational problems and insufficient public awareness. The conclusion highlights the need for systemic measures, encompassing both the strengthening of control mechanisms and the promotion of universal design, as well as the fostering of attitudes conducive to building an inclusive society.