You are here: 8.0 Water > Wat 02 Water monitoring

Wat 02 Water monitoring

Number of credits available Minimum standards

Yes (criterion 1 only)


To ensure water consumption can be monitored and managed and therefore encourage reductions in water consumption.

Assessment Criteria

The following is required to demonstrate compliance for:

One credit

  1. The specification of a water meter on the mains water supply to each building; this includes instances where water is supplied via a borehole or other private source.
  2. Water-consuming plant or building areas, consuming 10% or more of the building’s total water demand, are either fitted with sub meters or have water monitoring equipment integral to the plant or area (see Compliance notes).
  3. Each meter (main and sub) has a pulsed output to enable connection to a Building Management System (BMS) for the monitoring of water consumption.
  4. If the site on which the building is located has an existing BMS, managed by the same occupier/owner (as the new building), the pulsed water meter(s) for the new building must be connected to the existing BMS.

Compliance Notes





Water consuming plant or building areas See criterion 2

As a minimum this includes the following (where present);

Buildings with a swimming pool and its associated changing facilities (toilets, showers etc.).

On sites with multiple units or buildings, e.g. shopping centres, industrial units, retail parks etc. separate sub meters are fitted on the water supply to the following areas (where present):

  1. Each individual unit supplied with water
  2. Common areas (covering the supply to toilet blocks)
  3. Service areas (covering the supply to outlets within storage, delivery, waste disposal areas etc.)
  4. Ancillary/separate buildings to the main development with water supply.

Laboratory: In any building with a laboratory or containing laboratories, a separate water meter is fitted on the water supply to any process or cooling loop for ‘plumbed-in’ laboratory process equipment.

Healthcare: for sites with multiple departments e.g. large health centres or acute hospitals, separate sub meters are fitted on the supply to the following areas where present:

  1. Staff and public areas
  2. Clinical areas and wards
  3. Letting areas: On the water supply to each tenant unit
  4. Laundries
  5. Main production kitchen
  6. Hydrotherapy pools
  7. Laboratories
  8. CSSD/HSDU, pathology, pharmacy, mortuary and any other major process water user
  9. Supplementary supply of water from a cold water tank


10% of water demand See criterion 2

The sub-meter requirement does not necessarily apply in the following cases, where the assessor confirms there will be no additional monitoring benefit resulting from their installation:

  1. Where a building has only one or two small sources of water demand (e.g. an office with sanitary fittings and a small kitchen)
  2. Where the building has two sources of water demand, one significantly larger than the other, and the water consumption for the larger demand is likely to mask the smaller demand.


Shell only

Where metering arrangements within tenanted units/areas will be the responsibility of the future tenant, compliance with the relevant criteria for this BREEAM issue can be demonstrated via one of the following means for such areas:

  1. Option 1 – Use of a tenancy lease agreement between the developer and tenant/s (full value of available credits)
  2. Option 2 – A Green Building Guide for tenant fit outs (half the value of the available credits)
  3. Option 3 – Developer/Tenant collaboration (full value of available credits)

Refer to Appendix D – BREEAM New Construction and shell and core/speculative assessments of this Scheme Document for further description of the above options.


Extensions to existing buildings See criterion 4

If no new water supply is being installed because occupants of the extended building will use the facilities in, and therefore water supply to the existing building, then the following must be provided in the existing building;

  1. A water meter for the mains water supply
  2. Sub-meters for large water consuming plant or facilities e.g. evaporative cooling, swimming pool etc. (where present).

The meters provided must have a pulsed output or connection to existing BMS in accordance with the assessment criteria.


No water supply to the building/unit If there is no installed water supply to the assessed building because there will be no water-consuming fittings in the building, then in such instances the guidance given in the above Compliance note for extensions to existing building applies.

Schedule of Evidence

Ref Design stage
Post-construction stage

Relevant section/clauses of the building specification or contract

Design drawings

BREEAM Assessor’s site inspection report and photographic evidence OR ‘As built’ drawings

Additional Information

Relevant definitions

Staff areas
Hea 01 Visual comfort.
Clinical areas
Hea 01 Visual comfort.
Patient areas
Hea 01 Visual comfort.
Central Sterile Supply Department.
Hospital Sterilisation and Disinfection Unit.

Checklists and Tables


Calculation procedures


Other information