The requirements in Part R of Schedule 1 to the Building Regulations 2010 are supported by Approved Document R which took effect on 1 January 2017.
Cefnogir y gofynion yn Rhan R o Atodlen 1 i Reoliadau Adeiladu 2010 gan Ddogfen Gymeradwy R a ddaeth i rym ar 1 Ionawr 2017.