Typically you must notify us before carrying out work on any water system installations in connection with:

• Erection of any new building or structure
• Extension or alteration of a water system in non-domestic premises
• Material change in use of any premises
• Bidet - ascending spray/flexible hose
• Bath - larger than 230 litres
• Pump/booster drawing more than 12 l/min
• Reverse osmosis unit
• Water treatment unit producing wastewater discharge or requiring regeneration
• RPZ valve or other mechanical device for preventing backflow prevention in Fluid 5 or 4
• Garden watering systems - unless hand operated
• Water systems laid outside buildings less than 750mm or greater than 1350mm below ground
• Automatically replenished ponds or swimming pools of more than 10,000litres

For more information see Regulation 5 of the Water Supply (Water Fittings) Regulations 1999. This identifies the main areas of installation/alteration which water suppliers need to be aware of in advance.

Click here to find out how to notify us of a plumbing installation