Building Regulations 2010
New buildings need to be designed to have 'reasonable' access to a building and the facilities provided under Requirements M of the Building Regulations. Approved Document M Volume 2 2015 provides guidance on meeting the minumum requirements.
Many other documents, including BS8300:2009 provide additional guidance.
The Equality Act 2010
Reasonable adjustments may be required to existing buildings, as a duty under the Equality Act 2010.
Do you have an access consultant on your design team?
Access-enable can help by providing a stand alone plan review to input from concept to completion.