Southern Water own and maintain the large water mains and smaller communication pipes that run in the public highway. The same is true for the water meter installed at the site boundary. The supply pipe is the section of pipework within the private land and is the customer's responsibility. The picture below illustrates this.
If you are constructing a new building or converting an existing building into multiple units, you will need a new communication pipe(s). Southern Water will not allow you to connect any new supply pipes onto your existing communication pipe due to potential complications with pressure and it not being standard industry practice since 1991.
Communication pipes can be in various configurations depending on your development but our aim is to ensure accurate future billing whilst minimising costs to developers.
If you have a shared communication pipe with your neighbour, and you require an independent supply, you will need to bring a new supply pipe to the boundary of the public highway/verge. Southern Water will estimate for bringing a new communication pipe to meet your supply pipe and installing a meter box to join them.
If you are building semi-detached houses and are able to bring both supply pipes to your boundary together, no further than 300mm apart, then it will be possible for Southern Water to estimate for bringing one 32mm communication pipe to meet your supply pipes and installing a two way manifold and meter box to join them.
If you are building a small block of flats with up to six units, and can bring your supply pipes out together, no further than 700mm apart, then it will be possible for Southern Water to estimate for bringing one 63mm communication pipe to meet your supply pipes and installing a six way manifold and meter box to join them. To mitigate the risk of water theft from unused manifold ports, this option is only available where five or more new supplies are required.
All supply pipes, regardless of layout must be laid either in sand or ducts, at a depth of 750mm. They must take the shortest route from the building to the Southern Water stopcock and avoid crossing any third party land. In addition they must be labelled with the plot number, fitted with an internal stopcock and have the end capped off. All supply pipes must pass an inspection by a Southern Water inspector before any communication pipe works can be planned.
If you are building 5 or more new houses, with a new road serving them, you may need a water main to be extended into your site. This can be priced for under the S41 mains requisition application. If you have any queries please email us a plan to email@example.com in advance of making your application so we can advise on the best way forward.
Southern Water only permits internal meters to be installed for blocks of flats. Southern Water will install the meters onto your private pipe work that you, the customer, have prepared in advance. Southern Water can supply the meter carriers (manifolds) for you to install if you request this on your application, or you can source and install your own. They must be installed in lockable cupboards, inside communal entrance halls, or basements. The area must be secure, and accessible via key-code entry pad. The terms and conditions we require developers to comply with is available here
If you are planning to install a fire sprinkler system,
it is essential the background information notes are read
and complied with also
Southern Water applies these charges in accordance with OFWAT ruling, in order to obtain a contribution towards treatment works upgrades. This is because new water connections place an additional burden on existing water treatment sites to produce the fresh water, and up to 95% of that water will in turn enter the public sewer and require treatment at a sewerage treatment works too.
Southern Water applies VAT to its estimates as instructed by HMRC.
Sizing of pipe
- New build dwellings i.e. new buildings with 3 or more new external walls and roof, are exempt from paying VAT.
- Listed buildings with appropriate Listed Building Status are also exempt from VAT
- Existing buildings that are converted to residential dwellings are required to pay VAT at 5%.
A plumbing consultant or plumber will advise you on what size pipe and flow rate is required to serve your specific development. This service is not offered by Southern Water.
Production of estimates
The Developer Services department that processes these applications is required by OFWAT to produce estimates in 28 days from the receipt of a complete application. If anything is missing from your application and we are unable to process it, it will be deemed incomplete, and we will contact you in writing to request this information. Only once we have received all of the required information will the 28 day countdown start.
To produce the estimate, our surveyor will attend site to assess the road conditions and measure up for your requirements. Following receipt of his report, a detailed estimate will be compiled. Due to the fact that it is impossible to truly know what conditions will be encountered until the works commence, the price you receive is estimated. Should the work turn out to cost less than the given price, then you will receive a refund. Alternatively, should the work cost more, then you will receive an invoice for the outstanding amount.
As of 1st April 2017 customers in England and Wales have had the choice of who they purchase their commercial water from. A list of Market Retailers who provide this service is available here open-water.org.uk
. Once we have installed your commercial supply, the retailer you have nominated in the form below, will bill you. If you do not nominate a retailer, we will appoint one on your behalf.
For terms and conditions