Apply for a new water main and service connections

Due to the time we need to process applications, we can only guarantee issuing quotes under our 2019/20 charging arrangements for new mains by 19 February 2020 (and new water connections by 4 March 2020). In each case, the application must be complete and require no further information.

We can’t guarantee that any applications submitted after this date will be issued under our 2019/20 charging arrangements.

If you’ve not begun work and feel that our 2020/21 charging arrangements are more favourable to your scheme, you can request a requote after 31 March 2020. Please note that a requote fee will be applicable. For more information, see our New connection charging section.

Check network capacity

For larger developments we’ll need to check we have capacity in our network to supply your new development. You should ask us to do this by making a ‘pre-planning enquiry’ as early as you can, ideally even before you apply for planning permission – this will minimise the risk of delays later on.

Enquire about capacity

Estimate our charges

If you’d like to estimate the charges for your work, you can do this by referring to our charging arrangements.

Get a quote

You should apply for a quote if:

  • you have planning permission
  • you intend to pay the quote within the next 180 calendar days (otherwise it will expire)

Please complete our PDF application form. After you submit your application, within 28 calendar days (or 42 calendar days for sites with more than 500 plots, or which are technically challenging) we’ll send you a quote for the new water main only, and will explain your option to use a self-lay provider. We’ll ask you to sign and return a copy of the quote, indicating whether you’d like to use a self-lay provider or want us to do the work.

We’ll liaise with you regarding the quote for the new service connections, sending this on separately at a later date when you let us know you are ready for it. This prevents it from expiring while the new water main is being constructed.

Apply for new mains and service connections

From 13 April 2019, you’ll need to pay upfront application and design fees when applying for new service connections on an existing main. These cover our initial costs including administering and preparing your quote and finalising the technical solution required. They’re non-refundable, but will be deducted (excluding VAT) from the total balance due when you accept your quote.

Paying upfront fees by BACS, CHAPS or cheque

Apply for service connections on an existing main

After you submit your application and pay the upfront fees, we’ll send you a quote within 14 calendar days.

Paying upfront fees by debit or credit card

You can apply online. After you submit your application and pay the upfront fees, we’ll send you a quote within 14 calendar days.

Firefighting supplies

It's your responsibility to ensure that the main from which any firefighting supply is being taken is capable of providing your firefighting requirements. You'll need to request that a fire protection company, in accordance with advice from the local fire authority, undertakes a flow and pressure test from the nearest available fire hydrant or washout point on the main for that the supply. The test will establish if the main has the required flow and pressure for your fire protection needs. A network service technician from Thames Water will need to be present to operate the valves – please call us on 0800 316 9800 to arrange this.

Internal-fit water meters

While it is our strategy for all internal meters to be fitted with an AMR radio to enable remote reading, all meters must still be able to be read visually. Consequently they must be fitted where they can be easily read and accessed for installation, maintenance or exchange, and must conform to health and safety requirements. For this reason, we won’t allow any apparatus to which we may require access to be fitted in the ceiling void. There must also be no obstruction preventing the meter being read by a customer, meter reader or any other Thames Water personnel. The meters we provide will therefore need to be fitted within a common area on each floor, or within your plant room.

Make a payment

If you've already received a quote and need to make a payment, use the link below.

Pay now

Book a Water Regulations inspection

When laying new water pipes up to the property boundary for us to connect to, you’ll need to comply with the Water Supply (Water Fittings) Regulations 1999. These are legal requirements which set out how plumbing systems and fittings must be installed and maintained. You’ll need to ensure, for example, that:

  • The pipework is 750mm to 1,350mm below ground level
  • You’ve run the pipework from the boundary to where it enters the building, with both ends of the duct sealed
  • You have an internal stop valve fitted within the property
  • Your pipework matches the size shown on our quote

We advise you to appoint a reputable plumber who’s familiar with the standards required. One way of doing this is to employ a member of an approval scheme, such as the Thames Approved Plumbers Scheme, which checks that plumbers are qualified and have the required knowledge of the Water Regulations.

If your plumber is a member of an approval scheme, they’ll be able to provide a certificate of compliance and we won’t need to inspect the work. Otherwise we’ll need to carry out an inspection to make sure the work meets the requirements of the Water Regulations.

To arrange a Water Regulations inspection, please call us on 0800 009 3921.