This document gives recommendations, and specifies requirements, on the design of potable water installations within buildings and for pipework outside buildings but within the premises (see EN 806-1) and applies to new installations, alterations and repairs.
BS EN 806-2:2005 history
2011BS 8558:2011 Guide to the design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages. Complimentary guidance to BS EN 806
2006BS 6700:2006+A1:2009 Design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages Specification
2006BS 6700:2006 Design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages - Specification
1997BS 6700:1997 Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages