In this guide
2. Accessibility of ground floor WCs
Any dwelling unit that has been constructed after 1999 will have a ground floor WC installed which has been designed to cater for any visiting wheelchair users.
During any re-fitting this WC should not be removed and the accessibility of the WC should not be made any worse as it would then be inadequate for future wheelchair users.
For these reasons, a building regulations application may be required if any alteration is to take place to an existing ground floor WC.