Serving parts of North West London and the Home Counties.

In this section

Are we your water provider?

Use our post code search to find out.

To use the search please enter your complete postcode, for example, AL10 9EZ.

Water fittings regulations

Notify us of your plumbing work

If you are planning any plumbing work in accordance with the Water Supply (Water Fittings) Regulations 1999, you must notify us in advance to ensure that the work will not impact the quality and safety of the water.

This includes, but is not limited to:

  • Construction of a building or structure

  • Proposed change of use

  • Installation of backflow protection

  • Lead replacement

  • Rerouting of an existing supply

  • Any alterations or extensions to plumbing in non-domestic premises or for animal welfare purposes

To learn more about the regulations visit >>


To complete this form you need to attach:

  1. A plan of the premises to which the proposal relates to

  2. A schematic diagram showing pipework, terminal fittings and backflow prevention devices to be installed

  3. A list of the fittings you will be using

Fields marked with * are mandatory.

  • 1Contact and scheme details

Details of person giving notice

Name: *
Email address: *
Address: *
Postcode: *
Telephone number: *This can be a mobile number
Alternative number:
Fax number:

Details of approved contractor

Please give us the details of your approved contractor, if you are using one.

Name of approved contractor:
Contractor's address:
Approved scheme:
Registration number:

Details of premises

Onsite contact: *
Contact telephone number: *
Premises address: *
Postcode: *
What is the property currently used for, e.g. house, farm, office? *
If there is a proposed change of use, what will the premises be used for? Please write 'No change', if appropriate. *

Details of the work

Please describe the work or changes that are planned. *
What is the proposed start date? *You must provide the expected start date, even if this may change.

Notifiable works

The list below shows the types of water fittings that you must tell us about. Please tick all items that apply.

Our planned work includes:

Drawings and schedule of fittings

You  must send a plan or drawings of your proposed works site with a schematic diagram showing pipework, terminal fittings and backflow prevention devices to be installed.

You can use the upload buttons below to attach the file from your computer. There is a max file size per form of 3mb, so you may need to save any photographs as low res or use file compression. 

If you are unable to send digital copies, you may send hard copies to: 
Network Regulations,
Affinity Water, Redricks Lane, Sawbridgeworth, Hertfordshire, CM21 0RL 

If you do not provide the correct documentation, your application may be delayed or rejected. 

Please provide a list of the fittings you intend to use in your proposed works. *All fittings must comply with the requirements of the Water Supply (Water Fittings) Regulations 1999 (4).
Please upload plan/drawing/schematic
Please upload further plan/drawing/schematic
Please tell us how you are sending plans and drawings to us. *
Please use this space to add any more information about your notification or works. This form will only go to the Regulations Team who cannot answer questions about your account.

Your contact email

In case we have a query with your form please enter a contact email address below.

Email *


 We will use the information you have provided to make sure that all fittings meet the regulations and that the scheme does not pose a risk to our ability to meet our supply obligations. We have 10 working days from receipt of your notification to advise you if we intend to withhold consent or agree subject to specified conditions. Work must not begin until this period has passed. 

If we have to wait for drawings in the post, the 10 working days will not begin until we have all the necessary information.

Data protection: The information you provide may be used by Affinity Water to provide you with water services, give you information about your water supply and manage your account; including the collection and recovery of charges.



A copy of the completed form will be sent to the email address you have given.