BS 9266:2013 pdf free.Design of accessible and adaptable general needs housing – Code of practice.
BS 9266 For the purposes of this British Standard, the following terms and definitions apply.
accessible and adaptable general needs housing housing that is sufficiently flexible and convenient to meet the existing and
changing requirements of most households, and in which the interior fabric rather than the structure can be easily adapted to accommodate aids and
equipment NOTE Such households might include older people, families with children, physically disabled people or those with sensory impairments. Aids and equipment might include stairlifts, hoists and grab rails that make it easier for older people and some disabled people to stay in their home when their access needs change.designated accessible parking standing place for a private car that is suitable for, and designated for use by, disabled persons holding an official parking badge (e.g. blue badge) General principles of accessibility COMMENTARY ON CLAUSE 4
The following principles about access to dwellings and communal areas within blocks of flats, and the arrangement of activity spaces within and around them, are intended to: make visiting a dwelling as convenient as possible for all people; facilitate cost-effective adjustments to enable an occupant to live and sleep  within easy (step-free) access from the dwelling entrance if unable to use the stairs for a period of time (e.g. after an operation); make it easier to adapt a dwelling to suit the needs of any occupants who have or acquire a more permanent disability and enable them to use all the facilities; make it easier for people to move around.
The key issue for car parking, particularly when associated with blocks of flats where parking is not on individual plots, is flexibility. As people with different needs move in and out of a neighbourhood, it is important that the parking arrangements are
sufficiently flexible to allow the provision to vary over time. Individual houses with on-plot parking For individual houses where there is car parking on the plot, a parking bay of at least 2.4 m x 4.8 m, hard surfaced and level, should be provided. An additional space of at least 900 mm and preferably 1 200 mm wide should be available along one side of the bay to extend it if required, to allow convenient access in and out of the vehicle.
NOTE 1 Part of this additional space could comprise a hard surfaced path, or soft landscaping which could be converted as required. BS 9266 pdf download.