Building and Developing
As an alternative to having new water mains and service connections laid by us, a developer can arrange for the work to be done by a self lay provider (SLP). The SLP simply needs to be accredited under the Lloyd’s Register Water Industry Registration Scheme (WIRS). The work also needs to meet the requirements of the Self-Laying of Water Mains and Services.
If you decide to use a SLP then we recommend all parties to read the documents linked to the principles of the code.
Water Codes for Adoption
Developer Process Flow - Adoptions and Requisitions
The adoptions and requisitions process flows diagrams sets out a summarised version of what is to be followed for a self- lay scheme (adoption) or requisition scheme.
The adoption procedural flow diagram sets out the journey for stages 1 to 7. These Procedures cannot be viewed in isolation and must be read in conjunction with the Water Sector Guidance (WSG) and Model Water Adoption Agreement (MWAA). The minimum information document can provide extra detail of the requirements for the SLP and water company at each stage.
As part of the Water Codes for Adoption, water companies are required to publish their local practices where there is a deviation from the standard practice.
Design and Construction Specification
As part of the overarching changes to the Water Industry Act 1991, that introduces statutory codes for adoption agreements, water companies are requested to publish their Design and Construction Specification. This document has been prepared to assist practitioners with the planning, design, construction and commissioning of a Self-Laid main and service pipes.
Annual Contestability Summary
Our Annual Contestability Summary sets out the contestable (Green) and non contestable (Red) activity. It also sets out activity deemed contestable where the water company can indicate its requirements to allow the SLP to carry out the task (Amber).
You can view our Redress process for more information.
Schemes initiated before 1 January 2021 need to meet the needs of the Code of Practice 2017.
Our processes are initiated through our simple to complete online application forms:
- If you require a point of connection enquiry please complete our online assessment form.
- Once point of connection response is received please complete our online mains application form.
- Please find a link to our design manual (PDF) to ensure your new mains are designed to our network specifications.
- If you require a source of water please send us a Form 1* (PDF).
- When you’re ready to start laying the main please send us a Form 2* (PDF).
- When you’re ready for the mains to be made live please send us a Form 3* (PDF), along with the documents listed in Form 3. The Fire Hydrant Adoption Certificate (PDF) can be used for both interim and final sign off by the Fire & Rescue Service (FRS). Here's the Asset Data Update Form (PDF) that needs to be completed, along with the Signed Off Site Sheet (PDF) and Routine Inline Mains Connection Form (PDF).
- When you’re ready to make service connections please send us a Form 4*(PDF).
- Once the service connections have been completed please send us a Form 5* (PDF).
- Severn Trent Water Approved Fittings List (Excel).
If you need to get in touch please see our contact list (PDF).
Water retail market for business customers
The water retail market for business customers now offers customers the freedom to choose who provides their retail services such as billing.Where the property to be connected is for a non-household customer, you now need to choose a retailer before connection. If you do not choose a retailer, then one will be allocated. Show Homes, temporary building supplies and site welfare facilities are eligible to switch between retailers, and although these connections are temporary, they still need a retailer. For more information on the changes and advice on how to choose a retailer, please visit the Open Water website.
*Please save the above forms to your device before editing and emailing to us
All work relating to new sewers will need to be carried out by a contractor you hire. We do not have an approved contractors scheme for sewers. Our process is to and we will inspect the work carried out. Please click on the relevant development type for more information.
Check if the contractor you choose is accredited?
Lloyd’s Register operates, on behalf of Water Utility Companies, the Water Industry Registration Scheme (WIRS).
- Do STW always need to inspect the service pipes laid by a SLP?
- Self lay FAQs
- Can a developer use a SLP to lay a service pipe?
- What does WIRS mean?
- Can STW recommend a SLP?
- What is a form 5?
- How long will it take to get a meter delivered to site?
- How much does a service connection cost?
- What is a form 2?
- What is a form 4?
Get in touch
Call us: 0800 707 6600
There's a standard application fee for a new water main, which can be found in the Severn Trent Water (STW) current Developer Charges booklet on our website.
There is no standard cost for the laying of a new water main as the cost is site specific and depends on whether the developer chooses to have the new water main laid by STW, known as a requisition, or laid by a self lay organisation (SLO) known as self lay. Once the design for the new water mains scheme has been agreed and approved, STW will be able to give the applicant a site specific cost in our Offer Letter.
As part of an ongoing process to introduce competition into the water services market, Lloyd’s Register operate the Water Industry Registration Scheme (WIRS) on behalf of water utility companies. Lloyd’s Register perform technical assessments of companies who elect to be assessed to become a WIRS registered provider, commonly known as self-lay organisations (SLOs), for contestable works associated with the installation of water infrastructure.
Sorry, STW cannot recommend a SLO.
A developer can find an accredited SLO in their area on the Water Industry Registration Scheme (WIRS) website.
A Form 2 is a notification to start constructing a new water main. A SLO must complete this notification and send it STW to tell us when they are about to start construction on site. This notification should be sent to STW 15 days before any construction work starts.
STW expect the minimum information on a Form 2:
- The STW reference number(s).
- The date the SLO intends to start work on site.
- A description of the works.
- The name/organisation who is going to carry out the testing and chlorination and their telephone number.
- The date of the pre-start meeting.
- The expected date of the final connection.
- Who is going to do the final connection.
An incomplete Form 2 will be returned to the SLO and this failure of process will be reported to Lloyd’s Register.
A Form 3 is a water mains sampling and commissioning notification that a SLO must complete and send to STW to tell us when they want to connect the new water main. This notification should be sent to STW 10 days before the connection is needed.
STW expect the minimum information on a Form 3:
- The STW reference number(s).
- Confirmation who is going to make the final connection. If this is the SLO, then we also need a Routine Inline Mains Connection Notification.
- Confirmation that this is the final Form 3, if applicable.
STW expect the following documentation to be submitted with the Form3:
- The Pressure Test and Chlorination Certificate.
- The Interim Fire Hydrant Certificate issued to the local Fire Service.
- The Swabbing Certificate, the AS-Laid Drawing(s).
- The GISST update form.
- The site sign off sheet.
An incomplete Form 3 will be returned to the SLO and this failure of process will be reported to Lloyd’s Register. This may delay the connection.
A Form 4 is a notification to start connecting service pipes which a SLO must use to tell STW information about each property it intends to make a service connection to. This notification must be sent to STW 10 days before starting to make any connections, or 5 working days if a STW Watermark, or equivalent scheme, approved plumber has completed the work.
STW expect the minimum information for each plot to be completed on a Form 4:
- The STW reference number(s).
- The plot numbers which are ready for inspection .
- The postal address of each plot.
- The date the plots will be ready for inspection.
- The name/organisation who is going to install the meters.
- Confirmation that service connections have been paid for.
- Confirmation of pipe size.
- Confirmation of meter size needed.
- Confirmation of connection to an on-site or off-site main.
An incomplete Form 4 will be returned to the SLO and this failure of process will be reported to Lloyd’s Register.
A Form 5 is a notification of competed service pipe connections that a SLO must use to tell STW which meters have been installed at each property. This must be sent to STW within 5 days of making a service connection.
STW expect the minimum information for each plot to be completed on a Form 5:
- The STW reference number.
- The plot numbers to be connected.
- The date of connection.
- The postal address.
- The occupier’s details, if known.
If the SLO has also installed the meter we also expect:
- The date the meter was installed.
- The meter location.
- The meter size.
- The meter serial number.
- The meter reading.
An incomplete Form 5 will be returned to the SLO and this failure of process will be reported to Lloyd’s Register.
If STW attend site and find that a meter has not been fitted in the stated timescales we will charge for our visit and subsequent visit to fit the meter.
There is no standard cost for a service connection as the cost is plot and property specific.
The only standard costs are for metering and infrastructure which can be found in the STW current Developer Charges booklet on our website.
Yes. Service pipes can be laid by a SLO as long as the installer carries the appropriate Water Industry Registration Scheme (WIRS) accreditation.
No. If the SLO is a STW WaterMark, or equivalent scheme, approved plumber, and has sent STW the appropriate certification then we don’t need to inspect the service pipes laid by a SLO.
STW will send a quote to the SLO within 28 working days of receiving a request for a quote.
All water meters will be supplied by STW and delivered to an agreed location and will be paid for by either the developer or SLO within 3 working days of receiving the Form 5.