Building and Developing
Application forms and guidance for developers
All application forms and associated guidance documents for building projects in our region. All application forms are available in English and Welsh.
If you're already familiar with our processes for creating new connections, and you know what type of new connection you need, you'll find all of our application forms on this page.
If you're new to building projects in our region and need to familarise yourself with how our processes work, we've created some guidance documents to help you understand how to apply and what you need to do. They include lots of technical specifications and information on agreed design standards.
Building and development charges
Before you start the application process, it's worth having a look at our charges for building and development projects in the region, so you make sure you understand the costs.
Guidance for developers
Our guides can help you if you're new to building and developing and need to understand the process of applying to carry out work affecting water and waste pipes. You can read or download our developers' guides in PDF format.
English language application forms (PDFs)
Please download and complete the application forms relevant to your development. Please save the forms to your device before editing and emailing them to us.
Development enquires
Before you start work, you should have a capacity assesment to understand and plan what the property's water network needs are.
To do this you'll need to download a download and complete a water and drainage capacity assessment form for a proposed development.
Water connections
The forms you need to complete if you want to connect to the network for water.
Connecting to a 25mm or 32mm water main
If you need to connect to an existing, standard sized water main, you'll need to use one the following forms, depending on whether your project is taking place in Wrexham or Powys:
- Wrexham water connection from existing mains - 25mm and 32mm (PDF)
- Powys water connection from existing main - 25mm and 32mm (PDF)
You should only use these forms if you are:
- Building a new property
- Converting a property
- Upgrading an existing supply
- Connecting a temporary building supply
- Connecting an agricultural supply
Connecting to a 50mm water main
If you need to connect to an existing, large water main, you'll need to use one the following forms, depending on whether your project is taking place in Wrexham or Powys:
Laying a new water main yourself
If you plan to self-lay a new water connection, you'll need to download and complete the new water main applicaiton form (PDF).
Diverting a water main
If you need to divert an existing water main as part of your development, you will need to download and complete the diversion of water main form (PDF).
Waste connections
The forms you need to complete if you want to connect to the sewer network.
Connecting to an existing sewer
To connect to an existing sewer, you will need to download and complete the sewer connection form (PDF).
Adopting sewers and drains
Sewer adoption is an agreement made between a developer and the water company. The developer promises to build and maintain a sewer to a standard agreed to by the water company and the developer. The developer is then responsible for the maintenance of the sewer for a set period of time.
If you need to adopt a new sewer, you must download and complete the sewer adoption form (PDF).
Requisition of a new sewer
If you're unable to make sure your building project or development drains to a public sewer, because the land between your site and the sewer is owned by a third party who won't allow you to access the land, you can make a formal request to have a public sewer installed. This is called a requisition.
To do this you will need to download and complete the sewer requisition form (PDF).
Divert an existing sewer
It might be that you need to divert an existing sewer pipe during the build or development process. If you do, you will need to download and complete a sewer diversion form (PDF).
Welsh language application forms (PDFs)
Please download and complete the application forms relevant to your development. Please save the forms to your device before editing and emailing them to us.
Development enquires
Before you start work, you should have a capacity assesment to understand and plan what the property's water network needs are.
To do this you'll need to download and complete the water and drainage capacity assessment form for a proposed development
Water connections
The forms you need to complete if you want to connect to the network for water.
Connecting to a 25mm or 32mm water main
If you need to connect to an existing, standard sized water main, you'll need to use one the following forms, depending on whether your project is taking place in Wrexham or Powys:
- Wrexham water connection from existing mains - 25mm and 32mm (PDF)
- Powys water connection from existing main - 25mm and 32mm (PDF)
You should only use these forms if you are:
- Building a new property
- Converting a property
- Upgrading an existing supply
- Connecting a temporary building supply
- Connecting an agricultural supply
Connecting to a 50mm water main
If you need to connect to an existing, large water main, you'll need to use one the following forms, depending on whether your project is taking place in Wrexham or Powys:
Laying a new water main yourself
If you plan to self-lay a new water connection, you'll need to download and complete the new water main applicaiton form (PDF).
Diverting a water main
If you need to divert an existing water main as part of your development, you will need to download and complete the diversion of water main form (PDF).
Waste connections
The forms you need to complete if you want to connect to the sewer network.
Connecting to an existing sewer
To connect to an existing sewer, you will need to download and complete the sewer connection form (PDF).
Adopting sewers and drains
Sewer adoption is an agreement made between a developer and the water company. The developer promises to build and maintain a sewer to a standard agreed to by the water company and the developer. The developer is then responsible for the maintenance of the sewer for a set period of time.
If you need to adopt a new sewer, you must download and complete the sewer adoption form (PDF).
Requisition of a new sewer
If you're unable to make sure your building project or development drains to a public sewer, because the land between your site and the sewer is owned by a third party who won't allow you to access the land, you can make a formal request to have a public sewer installed. This is called a requisition.
To do this you will need to download and complete the sewer requisition form (PDF).
Divert an existing sewer
It might be that you need to divert an existing sewer pipe during the build or development process. If you do, you will need to download and complete a sewer diversion form (PDF).
Water fitting regulations
It's important that you ensure all work you carry out meets the requirements and standards set out in the UK's water fitting regulations.
Contact the team
If you have any quesitons, you can call the Building and Developing team on 0330 678 1481.